P001_扉_減圧弁 2011.3.

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Pressure Reducing Valve

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Pressure Reducing Valve Selection

Application Type
Max. Inlet Reduced

Direct Type

Diaphragm
Pilot Type

Bellows
Steam

Water

Pressure Pressure

Piston
Model Page
Air

Oil

(MPa) (MPa)

● 0.02-0.4 GD-6N ● ● 44
● 1.0 0.03-0.8 GP-27 ● ● 40
● 0.05-0.9 GP-1000 Series ● ● 32
● 1.6 0.05-1.4 GP-1000EN・1000H ● ● 38
● 1.7 0.02-1.0 GD-30 ● ● 42
● 0.05-0.9 GPK-2001 ● ● 22
● GD-30S ● ● 42
0.02-1.0
● GD-45P・45 ● ● 43
2.0
● 0.02-1.4 GP-2000 ● ● 19
● 0.05-1.4 GDK-2000 ● ● 24
● 0.2-1.4 GPK-2003 ● ● 22
● 3.0 0.02-2.0 GP-2000CS ● ● 30

● 0.3 0.002-0.2 GD-4 ● ● 83

● 0.4 0.0005-0.02 GD-400・400SS ● ● 81
● 0.8 0.002-0.2 GD-4B ● ● 83
● 0.99 0.05-0.85 GD-9 ● ● 83
● 0.05-0.9 GP-1000T Series ● ● 75
● ● ● 0.02-0.4 GD-6 ● ● 69
● ● ● GD-200・200C・20 ● ● 45
1.0
● GD-26G・27G ● ● 78
0.05-0.7
● GD-26GS・27GS ● ● 79
● ● GD-8N ● ● 83
● ● 0.02-0.5 GD-41G・43G ● ● 67
2.0
● ● ● 0.05-1.0 GD-200H ● ● 45

● 0.05-0.25 GD-15・15C ● ● 83
● GD-38 Series ● ● 60
0.05-0.3
● GD-46 Series ● ● 57
● 0.05-0.35 GD-25GJ・25JC・25GJ-K ● ● 64
1.0
● GD-26-N・27-N ● ● 52
● 0.05-0.7 GD-26S・27S ● ● 54
● ● GD-7・7B ● ● 71
● 0.07-0.7 GP-50 ● ● 83
● 1.6 0.05-0.55 GD-24・24B ● ● 50
● ● 2.0 0.02-0.5 GD-41・43 ● ● 67

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P r e s s u r e R e d u c i n g V a l v e

Selection of Pressure Reducing Valve for Steam

What is a Pressure Reducing Valve ??
A reducing valve is a regulating valve which keeps outlet pressure of fluid at a certain and lower level than inlet
pressure.
The original purpose of a reducing valve is, not just reducing the pressure of fluids, but also dynamically
controlling the flow rate that fluctuates in response to load variations. Many types of reducing valves are
available, and each of them has unique characteristics derived from each operation method, flow characteristic
and material of part. None of reducing valves can meet all the requirements for pressure reduction in all sorts of
applications. It is therefore important to select an optimum reducing valve for each use.

・Air-conditioning facilities
・Building facilities
・Air-conditioning facilities
・Food machinery ・Plant facilities
Applications

・Building facilities
・Laundry equipment ・Main pipes of steam line
・Plant facilities
・Small heaters ・Other applications requiring high
・Irrigation field, etc.
・Steam sterilization system, etc. accuracy
Equipment, facilities and piping systems
Equipment and facilities of small flow rate Equipment, facilities and piping systems
requiring low or medium flow rate
requiring high flow rate and stable
pressure control

Direct acting type Pilot operated type

Pilot valve senses reduced pressure and controls the pressure that actuates operating
parts, such as piston or diaphragm which opens and closes the main valve.

Sensing element for reduced pressure Piston type Diaphragm type

itself directly actuates the valve.
This type secures outstanding
This type offers excellent durability since a
Types

controllability and large flow rate by wide

piston is adopted at the operating part of
open main valve with a large pressure
the main valve.
receiver of a diaphragm.
Pressure Reducing Valve

This valve is a perfect choice for

Though direct-acting type is easily This type can be applied to a frequent use equipment and facilities with a large flow
affected by the change in flow rate or wide-ranged equipment and facilities. rate. It can be applied to facilities, etc.
compared with pilot-operated type, it is It secures the stable control and excellent where the stable control of a slight
compact and suitable for small equipment durability achieved by a piston at the variation in the reduced pressure is
with stable flow rate. pressure receiver. required, or where the flow rate violently
fluctuates.

Compact size, for small flow rate: GD-30 Series For various purposes: GP-1000 Series High performance: GP-2000 Series
Major Products for Steam

3 7-3, Futano-cho, Mizuho-ku, Nagoya, 467-0861, Japan Phone: 81-52-881-7199 Fax: 81-52-881-7201
www.yoshitake.jp

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Note for Selecting Pressure Reducing Valves

Flow Characteristics
In selecting a pressure reducing valve, the principle of“the greater embraces the less”can not be
applied. Too much bigger valve is less durable and prone to cause a rise in the reduced pressure at no
load. The nominal size of inlet piping, outlet piping, and pressure reducing valve should be properly and
individually selected. The nominal size of the pipe at reduced pressure side, which is inevitably larger than
that of the pressure reducing valve, should be large enough to cover large volume of steam with lower
pressure. It is very important to select a valve of the right model and right size according to the flow rate
and the pressure of steam.

P1 = 0.7 MPa, P2 = 0.3 MPa

Shut-off pressure rise Nominal size 25A
(within 0.02 MPa)
0.3 MPa Offset
Set pressure Offset 0.03 MPa
Reduced pressure

Offset 0.05 MPa

Min. adjustable flow rate

0.075 MPa

5% 18% 37% 100%

GP-2000 (Flow rate: 1,046 kg/h)
GP-1000 (Flow rate: 384 kg/h)

GD-30 (Flow rate: 190 kg/h) Flow rate

Reduced Pressure Sensing Method and Pressure Controllability

When a serious pressure loss and violent fluctuation with a wide range in flow rate are observed at the
outlet piping, the pressure stability at steam equipment can be installing an external sensing pipe that
directly introduce the outlet pressure from the installed point. It is because the sensing pipe enables the
pressure reducing valve to detect the accurate outlet pressure not affected by steam turbulence.

Pressure Reducing Valve

AL-160
Safety valve
External
SY-5 sensing pipe
Strainer

DS-1
Drain separator GP-2000
Pressure reducing valve

SFM-1S
TD-10NA Sight glass
Trap

7-3, Futano-cho, Mizuho-ku, Nagoya, 467-0861, Japan Phone: 81-52-881-7199 Fax: 81-52-881-7201 4
www.yoshitake.jp

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Features of Pilot Operated Diaphragm Type ＜GP-2000＞

1: Greater capacity
Large-size main diaphragm lifts larger main valve
than other types of the pressure reducing valves,
such as piston and bellows, and it allows a greater
steam capacity. Large-size main diaphragm can
lead a greater steam capacity per line size.

2: Accurate control
Large-size main diaphragm is more sensitive to
pressure fluctuation, and the valve adjusts the
outlet pressure in an accurate fashion.
Compared to an internal sensing type, this
external sensing type can avoid the effect of
turbulence which causes inaccurate outlet
pressure control.

3: Flexibility
GP-2000 Series are designed for
maximum flexibility; thereby they are
enabled to be used in conjunction with
other valves mounted in your system.
GP-2000 Series offer a broad lineup to
meet various applications and
conditions, regardless of control
Pressure Reducing Valve

purpose, installation space and

designed method of use.

4: Variations

Combination valve Air-loaded pressure reducing valve

CP-2005 GDK-2000 GPK-2001
Pressure & Temperature control Direct acting Pilot operated

5 7-3, Futano-cho, Mizuho-ku, Nagoya, 467-0861, Japan Phone: 81-52-881-7199 Fax: 81-52-881-7201
www.yoshitake.jp

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P r e s s u r e R e d u c i n g V a l v e

Advantage of Yoshitake Products ＜GP-2000＞

Wide Range Ability
Shut-off pressure rise
Reduced pressure

Offset
Minimum adjustable flow rate

Yoshitake products

Rated flow rate

Other products

5% 10% 50% 100%

Flow rate

Advantage: Wide range of steam capacity can be controlled with only one valve.
GP-2000 handles wide range of steam capacity. Yoshitake products can handle 5% of rated flow as the
minimum. Most of other products on the market can adjust 10% as the minimum.

Excellent Performance in On-Off Use

Due to spherical shape of main valve, leakage from the main valve is only 0.01% of rated flow rate
complying to ANSI Class IV. The most suitable line is

DEAD-END service such as ON-OFF use (Forming machine, etc.)

Normal flat main valve causes leakage easily and not suitable for On-Off service.

Pressure Reducing Valve

Leakage Class Maximum Seat Leakage Reference
Class I − By agreement between user and supplier
Class II 0.5% of rated valve capacity Commercial double-seat valves or balanced single-seat valves with a piston ring seal and metal-to-metal seats
Class III 0.1% of rated valve capacity Commercial double-seat valves or balanced single-seat valves with a higher degree of seat and seal tightness
Commercial unbalanced single-seat valves and balanced single-seat valves with extra tight piston rings or other
Class IV 0.01% of rated valve capacity
sealing means and metal-to-metal seats
Valves for critical applications where the valve is closed for long period of time with high defferential pressure
across the seating surfaces
Class V abbreviation
Metal seat, unbalanced single-seat valves or balanced single-seat designs with exceptional seat and seal
tightness
Class VI abbreviation Resilient seating single-seat valves with "O" rings or similar gapless seals
Excerpt from ANSI / FCI 70-2-2006 Control Valve Seat Leakage

Long Durability
Due to special patented shape in the diaphragm case, the main diaphragm is equally pressurized and
also stands for long time of usage. Compared to others on the market, the main diaphragm has ten times
longer life.

7-3, Futano-cho, Mizuho-ku, Nagoya, 467-0861, Japan Phone: 81-52-881-7199 Fax: 81-52-881-7201 6
www.yoshitake.jp

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Features of Pilot Operated Piston Type ＜GP-1000＞

1: Greater capacity and accuracy

Two valves are incorporated in the piston type pressure
reducing valve. The pilot valve controls the pressure to
piston, which opens larger main valve. Therefore, the
greater capacity and accuracy are obtained in piston type
pressure reducing valve compared to direct acting
pressure reducing valve.

2: Easy installation
No need to install a sensing pipe additionally since
designed as internal sensing type. Easy installation and a
lot of flexibility in installation compared to the external
sensing type.

3: Incorporating new design

Piston & Cylinder:
“Twin Guide Design”structure keeps stable vertical
operation and ensures accurate operation over an
extended time period.

Pull-up Pilot Valve:

Pull-up design ensures tight seal for a long period of time.

Main valve:
Spherical main valve ensures a tight shut-off meeting
Pressure Reducing Valve

ANSI Class Ⅳ and can be applied to dead-end service

line.

4: Variations

Easy adjustment For remote control Anti-corrosion

GP-1001 GP-1200 GP-1000AS
With plastic handle Air-loaded type All stainless steel made

7 7-3, Futano-cho, Mizuho-ku, Nagoya, 467-0861, Japan Phone: 81-52-881-7199 Fax: 81-52-881-7201
www.yoshitake.jp

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Features of Direct Acting Type ＜GD-30＞

1: Easy pressure setting

Red colored plastic cap allows changing
the set pressure without tools. Simple
operation is suitable for the line that
requires frequent changes in set pressure.

2: Simple and compact design

Fewer parts and convoluted phosphor
bellows enable smaller sized body. The
smallest and the most economical
pressure reducing valve in our lineup
permits easy maintenance.

3: Variations
Different body materials are available
including stainless steel and ductile cast
iron. They are suitable for a wide range of
applications, including kitchen systems,
cleaning machines, food processing
equipment, sterilizers, air conditioning

Pressure Reducing Valve

equipment, etc.

4: Variations

Cast bronze Stainless steel Ductile cast iron

GD-30 GD-30S GD-45 GD-45P
(without handle) (with handle)

7-3, Futano-cho, Mizuho-ku, Nagoya, 467-0861, Japan Phone: 81-52-881-7199 Fax: 81-52-881-7201 8
www.yoshitake.jp

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Selection of Pressure Reducing Valve for Liquid

What is a Pressure Reducing Valve ??
A reducing valve is a regulating valve which keeps outlet pressure of fluid at a certain and lower level
than inlet pressure.
Selecting proper pressure reducing valve is a key to maintain stable reduced pressure. Offering direct
acting pressure valve is an answer from Yoshitake Inc.

・Construction equipment
Applications

・Irrigation
・High-rise buildings
・Industrial or commercial air conditioning
・Complex housing unit
・Building utility system
・Industrial plant system

Balancing type

Pressure balance structure can keep the reduced pressure at a constant level without being affected by the inlet pressure.

Direct acting type

Types

Most of Yoshitake pressure reducing valve for water are categorized as direct acting type. It controls the reduced pressure even for
wide range of water capacity and allows quicker response than pilot operated type. In addition, Yoshitake direct acting pressure
reducing valve solves various problems such as vibration and noise.
Pressure Reducing Valve

40-3400 L/min 30-1800 L/min 30-50 L/min

GD-200 GD-26 Series GD-46 Series

Major Products

9 7-3, Futano-cho, Mizuho-ku, Nagoya, 467-0861, Japan Phone: 81-52-881-7199 Fax: 81-52-881-7201
www.yoshitake.jp

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Features of Direct Acting Type for Water ＜GD-200＞

1: Accurate control
Highly accurate control is obtained with a large
diaphragm and a pressure balancing mechanism,
which maintains a constant reduced pressure.

2: Simple and suitable design

The product consists of less parts than a pilot
operated valve and rubber diaphragm sensitively
responds to slight pressure change. All materials
are advisedly selected and long life durability is
accomplished.

3: Variations
Electrodeposition coating is applied as standard
painting. Powder and Nylon coating both inside
and outside of the body for superior anti-corrosion
are also available for wide range of liquid
applications.

Pressure Reducing Valve

GD-200 GD-200C GD-200HS

Standard model Nylon 11 coating model Epoxy powder coating model

7-3, Futano-cho, Mizuho-ku, Nagoya, 467-0861, Japan Phone: 81-52-881-7199 Fax: 81-52-881-7201 10
www.yoshitake.jp

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Nominal Size Selection of Pressure Reducing Valve

In selecting a pressure reducing valve, it is important to consider an appropriate nominal size. To select
the optimum size, it is empirically recommended to determine its nominal size in 20% to 80% range of
rated flow rate. If the operating flow rate is near to the rated flow rate, the valve constantly and fully runs,
leading to shortened service life. If the operating flow rate is near to the minimum adjusting flow rate, initial
cost becomes expensive.

How to Select the Optimum Size

Shut-off pressure rise

Offset
Reduced pressure

Minimum adjustable flow rate

Optimum benefit

Rated flow rate

range 20-80%

5% 20% 80% 100%

To select the appropriate nominal size, refer to the nominal size selection chart. When selecting the
nominal size, an 80% to 90% safety factor of flow rate should be used, considering the heat loss and the
pressure loss which occurs at the pressure reducing valve's front and back stop valves, the strainer, and
etc.
Also, the pipe resistance should be considered when selecting the pipe size (avoid too small pipe).
Pressure Reducing Valve

There are 3 kinds of charts available regarding flow rate. Please find appropriate one for your usage.
1: Calculation formula (Page: 12)
2: Nominal size selection chart (Printed as a material for selection per product)
3: Flow rate table for GP-2000 (Page: 21) / GP-1000 (Page: 37) / GD-200 (Page: 48)

11 7-3, Futano-cho, Mizuho-ku, Nagoya, 467-0861, Japan Phone: 81-52-881-7199 Fax: 81-52-881-7201
www.yoshitake.jp

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Sizing for Pressure Reducing Valve

Calculation Formula for Cv Value Formula for Correction of Viscosity
〈For steam〉 First, find viscosity index Iv.
P1 72780 ∆P 14 12
When P2 ＞
2
Cv =
Wk
138 ∆P (P1 + P2)
Iv =
Mcst G V ( )
P1 Wk
When P2 ≦ Cv =
2 120P1 Find K from calculated Iv on the viscosity correction curve.
The calculated maximum flow rate (V) devided by K is the value
〈For gas〉 of the corrected flow rate.
P1 Q (273 + t) G
When P2 ＞ Cv = Viscosity correction curve
2 2940 ∆P (P1 + P2)
2.4
P1 Q (273 + t) G
When P2 ≦ Cv = 2.3
2 2550P1 2.2

K: Correction coefficient
2.1
〈For liquid〉 0.365V G 2.0
Cv = 1.9
∆P
1.8
1.7
W: Max. steam flow rate [kg/h] 1.6
P1: Inlet pressure [MPa・A] 1.5
P2: Outlet pressure [MPa・A] 1.4
∆P: P1 – P2 [MPa] 1.3
k : 1 + 0.0013 x {superheated steam temp. [˚C] 1.2
– saturated steam temp. [˚C] } 1.1
Q : Max. gas flow rate [m3/h (standard condition)] 1.0
20 30 40 6080100 200 300 500 7001000 2000 3000
G : Specific gravity (relative to air for gas, or relative to water for liquid)
Iv: Viscosity index
t : Fluid temperature [˚C]
V : Max. liquid flow rate [m3/h] Corrected maximum flow rate: V' = V/K (m3/h)
Cv: Cv value of each nominal size
Iv : Viscosity index
Mcst: Viscosity [cSt]

Cv Value Table
Nominal size 6A 8A 10A 15A 20A 25A 32A 40A 50A 65A 80A 100A 125A 150A 200A 250A 300A
Model
GP-2000 screwed
5.0 7.2 10.9 14.3 18.8 32
GPK-2001・2003 screwed
GP-2000 flanged・GP-2000CS
5.0 7.2 10.9 14.3 18.8 32 60 78 120 (125) (250) (260)

Pressure Reducing Valve

GPK-2001・2003 flanged
GDK-2000 5.0 7.2 10.9 14.3 18.8 32 60 78 120
GP-1000 Series 1.0 2.3 4 6.5 9 16 25 36 64
GP-27 100 144 256
GD-6N 0.35 0.5 1.0 1.5
GD-4 2 3 4 5 8 21 27 42 72 94
GD-4B 2 3 4 5 8 12 16 24 36 48
GD-400・400SS 1.5 2 3
GD-6 0.35 0.5 1.0 1.5
GD-7 2 3 6 8 15 23 30 40 50 60
GD-7B 2 3 4 5 8 12 16 20 25 30
GP-50 180 260 470 710 900
GD-8N 0.1 0.1 0.2 0.2
GD-9 0.2 0.4 0.8 1.0 1.5
GD-200・200C・200H 2.5 4 5 8 12 16 28 36 68 75 108
GD-24GS・24GS-N 1.5 1.9 3 4 7 10
GD-26-N・28-N・26G 2 2.3 3.5 6 7 11
GD-27-N・29-N・27G 3.5 6 7 11 21 26 38
GD-26S・28S・26GS 2.3 3.5 6 7 11
GD-27S・29S・27GS 2.3 3.5 6 7 11 21 26 38
GD-41・43・41G・43G 0.4 0.6 0.8
・The above values in parentheses are the dimensions of the GP-2000 flanged.

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www.yoshitake.jp

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Guidelines for Pressure Reducing Valve for Steam

Please refer to this guidelines and confirm the adequacy for the
optimum use of the pressure reducing valves for steam.

Bypass

Pressure
gauge

External sensing pipe Stop va

3 Drain separator

Reducer Reducer

Union Union
Stop valve Stop valve

2 Strainer

Stop valve 1 Pressure reducing valve

1 Pressure reducing valve

6 Sight glass
Model Size Stop valve

GP-2000 Series 15A-200A

GP-1000 Series 15A-100A 4 Steam trap
GP-27 125A-200A
GD-30・30S・45・45P 15A-25A
GD-6N 10A-25A

2 Strainer 3 Drain separator 4 Steam trap

The strainer is installed in order to prevent The drain separator efficiently separates The steam trap promptly discharges the
the problems in the steam system condensate and assures that dry and condensate separated by the drain
Pressure Reducing Valve

attributable to scale. 80-100 mesh size is clean steam is supplied to the system. separator.
recommended for steam. Install it with its It also separates scale and contributes in
cap or cover for screen sideways so that increasing the durability of the pressure
the condensate accumulation is minimized. reducing valve.
SY-5 DS-1 TSD-42
FCD450 FCD450 SCS2A
Screwed (10-50A) Screwed (15-50A) Screwed (15-25A)
Max 2.0 MPa Max 2.0 MPa Disc type Max 4.2 MPa
SY-40 DS-2 TD-10NA・30NA
FCD450 FCD450 FCD450
Flanged (15-300A) Flanged (15-100A) Screwed・Flanged (15-25A)
Max 1.0 MPa Max 2.0 MPa Disc type Max 2.0 MPa
SY-17
SCS13
Screwed (15-50A)
Max 2.0 MPa
SY-8
SCS13
Screwed (15-150A)
Max 1.0 MPa

13 7-3, Futano-cho, Mizuho-ku, Nagoya, 467-0861, Japan Phone: 81-52-881-7199 Fax: 81-52-881-7201
www.yoshitake.jp

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Precautions during installation

1: When installing solenoid valves or other devices
which open and close abruptly, they should be
installed in front of pressure reducing valve at a
suitable distance (3 meters or more is adequate).
2: For external sensing type, reduced pressure sensing
pipe should be installed at a point of minimum
Pressure gauge
5 Safety valve for warning use
turbulence.
3: For two-stage pressure reducing systems, the
distance between reducing valves should be at least
Stop valve 3 meters.
4: The nominal size should be usually larger than that
of pressure reducing valve to prevent excessive flow
velocities. The steam flow velocity should be 30 m/s
or less.
Stop valve 5: Pressure reducing valve must be installed vertically
7 Proper piping diameter to horizontal pipng.

5 Safety valve for warning use 7 Proper piping diameter

The safety valve for warning use is safety One of the essentials for optimizing a steam line is to select a
equipment that prevents troubles caused proper piping diameter. Stable pressure and flow rate are not
by abnormal increase in reduced pressure assured without a correct size of piping even if the appropriate
of the pressure reducing valve. pressure reducing vale is selected.
Ex.) P1 = 1.0 MPa P2 = 0.1 MPa Steam flow rate 250 kg/h
Inlet piping diameter : 25A
AL-160 Pressure reducing valve: Model GP-2000 15A
Outlet piping diameter : 50A
Lift type CAC406
Screwed (15-50A) Steam Flow Rate Table
For warning use (Saturated steam, Flow velocity 30 m/s, Carbon steel pipe) (kg/h)
Nominal size
AL-300
15A 20A 25A 32A 40A 50A
Lift type FCD450 Pressure MPa

Flanged (15-50A) 0.05 18 33 55 92 125 202

For warning use 0.1 24 44 72 120 164 265
0.2

Pressure Reducing Valve

AF-5 35 64 105 176 240 388
Full bore type CAC406 0.3 47 84 138 231 314 508
Screwed (20-50A) 0.4 58 104 170 285 387 627
For protection of equipment 0.5 69 124 202 339 460 745
0.6 79 143 234 392 533 862
0.7 90 163 266 445 605 978
0.8 101 182 297 498 676 1094
6 Sight glass
0.9 112 201 329 551 748 1209
With the sight glass, operation of the steam 1.0 122 220 360 603 819 1325
trap can be visually checked. When applied
to the steam condensate, use the product See page 336 “ Flow Velocity Table for Steam inside the Pipe.”
with mica plate to protect the glass.
●Set pressure of safety valve for alarm use at the outlet side of the
pressure reducing valve for steam
SFM-1S
Set pressure of
FCD450 Set pressure of safety valve (MPa)
pressure reducing valve (MPa)
Screwed (15-50A)
Flap type 0.1 or less Set pressure of the pressure reducing valve + 0.05 or more
0.11-0.4 Set pressure of the pressure reducing valve + 0.08 or more
SFM-1F
0.41-0.6 Set pressure of the pressure reducing valve + 0.1 or more
FCD450
0.61-0.8 Set pressure of the pressure reducing valve + 0.12 or more
Flanged (15-50A)
SFM-1S Flap type More than 0.8 Set pressure of the pressure reducing valve + 15%
･ When a safety valve is installed for alarm use at the outlet side of a pressure reducing
valve for steam and there are no laws or regulations specified to comply with, select a
safety valve whose blowout capacity is around 10% of the maximum flow rate of the
pressure reducing valve.

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www.yoshitake.jp

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P r e s s u r e R e d u c i n g V a l v e

Guidelines for Pressure Reducing Valve for Air/Gas

Please refer to this guidelines and confirm the adequacy for the
optimum use of the pressure reducing valves for air/gas.

Bypass stop valve

Pressure gauge

3 Drain separator

Stop valve Stop valve

Inlet 2 Strainer
1 Pressure reducing valve

Stop valve
Stop valve

1 Pressure reducing valve 2 Strainer 3 Drain separator

Pressure Reducing Valve

Model Size The strainer is installed to prevent troubles The drain separator efficiently separates
GP-1000T Series 15A-100A in the air/gas system attributable to scale. drain and assures that dry and clean
GD-26G Series 15A-50A The mesh size of 60 or more is air/gas is supplied to the system.
recommended. Install it with its cap or It also separates scale and contributes in
GD-6 10A-25A
cover for screen sideways as shown in increasing the durability of the pressure
GD-41G・43G 15A-25A the figure so that the drain accumulation is reducing valve.
GD-400・400SS 15A-25A minimized. DS-1
GD-4・4B 20A-150A SY-5
FCD450
GD-8N 6A-15A FCD450 Screwed (15-50A)
GD-9 8A-25A Screwed (10-50A) Max 2.0 MPa
Max 2.0 MPa
DS-2
SY-40
FCD450
FCD450 Flanged (15-100A)
Flanged (15-300A) Max 2.0 MPa
Max 1.0 MPa
SY-17
SCS13
Screwed (15-50A)
Max 2.0 MPa
SY-8
SCS13
Screwed (15-150A)
Max 1.0 MPa

15 7-3, Futano-cho, Mizuho-ku, Nagoya, 467-0861, Japan Phone: 81-52-881-7199 Fax: 81-52-881-7201
www.yoshitake.jp

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 P015-016_減圧 2011.3.9 6:51 PM ページ 2

P r e s s u r e R e d u c i n g V a l v e

・Please contact us for the application of each

model because it may require material change
4 Safety valve for warning use or confirmation of applicable fluids.
Pressure gauge

Applicable special fluids

Nitrogen
Argon
Propane
City gas
Ozone
op valve Methane
5 Proper piping diameter
COG gas
Outlet LNG
LPG
Oxygen
Carbon dioxide gas
Naphthalene
Xylene
Methyl isobutyl ketone
etc

4 Safety valve for warning use 5 Proper piping diameter

The safety valve for warning use is safety One of the essentials for optimizing an air/gas line is to select a
equipment that prevents troubles caused proper piping diameter. Stable pressure and flow rate are not
by the abnormal increase in reduced assured without a correct size of piping even if the appropriate
pressure of the pressure reducing valve. pressure reducing vale is selected.
Ex.) P1 = 0.7 MPa P2 = 0.1 MPa Air flow rate 250 kg/h
AL-150T Inlet piping diameter : 25A

Pressure Reducing Valve

Lift type CAC406 Pressure reducing valve: Model GD-26G 20A
Screwed (15-50A) Outlet piping diameter : 50A
For warning use Air Flow Rate Table
(Flow velocity 15 m/s, t = 20˚C, Carbon steel pipe) (kg/h)
Nominal size
AL-300T
15A 20A 25A 32A 40A 50A
Lift type FCD450 Pressure MPa
Flanged (15-50A) 0.1 26 47 77 129 175 283
For warning use 0.2 39 70 115 193 263 425
0.3 52 94 154 258 350 567
0.4 65 118 192 322 438 708
0.5 78 141 231 387 526 850
0.6 91 165 270 451 613 992
0.7 105 189 308 516 701 1134
0.8 118 212 347 581 789 1275
0.9 131 236 385 645 876 1417
1.0 144 260 424 710 964 1559
See page 337 “ Flow Velocity Table for Air inside the Pipe.”

7-3, Futano-cho, Mizuho-ku, Nagoya, 467-0861, Japan Phone: 81-52-881-7199 Fax: 81-52-881-7201 16
www.yoshitake.jp

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 P017-018_減圧 2011.3.9 6:52 PM ページ 1

P r e s s u r e R e d u c i n g V a l v e

Guidelines for Pressure Reducing Valve for Liquid

Bypass stop valve

2 Air vent valve

Pressure gauge

Stop valve Stop valve

3 Air outs
Inlet 1 Pressure reducing valve

4 Strainer
Pressure reducing valve
1
Model Size
GD-200 Series 15A-150A
GD-26 Series 15A-150A
GD-24 15A-50A
GD-25 Series 25A
GD-38 Series 20A
GD-46 Series 20A
GD-15C 15A-25A
GD-41･43 15A-25A
GD-6 10A-25A
GD-7･7B 20A-150A 3 Air out 5 Safety valve (Relief valve)
GD-8N 6A-15A The air out is used to continuously The safety valve is a safety equipment to
GP-50 125A-300A separate the air from the liquid. prevent troubles caused by abnormal
increase in reduced pressure of the
Pressure Reducing Valve

AO-2 pressure reducing valve.

2 Air vent valve
CAC406 AL-150T
The air in the piping system causes noise Screwed (20-50A)
and unstable pressure. The air vent valve CAC406
Max. 1.0 MPa
is installed to effectively discharge the air Lift type
in the system. Screwed (15-50A)
TA-3
FCD450 4Strainer AL-300T
(Electrodeposition coating) The strainer is installed to prevent FCD450
Screwed (15-32A) troubles caused by scale. Lift type
Max. 1.0 MPa The mesh size of 60 or more is Flanged (15-50A)
recommended for a cold/hot water line.
TA-16
SU-20 AL-260R
SCS13
Screwed (15-25A) FCD450 CAC406
Product complying with Basket strainer Pump relief valve
the Water Works Law Flanged (20-150A) Screwed (15-50A)
SY-6
CAC406
Y-type strainer
Screwed (15-50A)
SW-10
FCD450
Duplex strainer
Flanged (20-100A)

17 7-3, Futano-cho, Mizuho-ku, Nagoya, 467-0861, Japan Phone: 81-52-881-7199 Fax: 81-52-881-7201
www.yoshitake.jp

減圧-87
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P r e s s u r e R e d u c i n g V a l v e

・Please contact us for the application of each

model because it may require material change
or confirmation of applicable fluids.

5 Safety valve (Relief valve) Applicable special fluids

Pressure gauge Heavy oil A
Heavy oil B
Kerosene
Ethyl alcohol
Methanol
Toluene
Hexane
Stop valve Heptane
7 Proper piping diameter Outlet
6 Sight glass etc

Sight glass
6 7Proper piping diameter
With the sight glass, the flow can be Cold/hot water is an incompressible fluid and it does not change
visually checked. in the volume by the change in pressure. The proper piping
diameter is recommended to be determined at the flow velocity of
1-3 m/s.
Serious problems such as water hammer may occur if the flow
SB-1S velocity is too high.
FCD450 Water Flow Rate Table (Carbon steel pipe) (m3/h)
Nominal size
Screwed (15-50A) Flow
Ball type velocity 15A 20A 25A 32A 40A 50A
(m/s)
SF-1S 1.0 0.73 1.32 2.15 3.60 4.89 7.91
FCD450 1.2 0.88 1.58 2.58 4.32 5.87 9.49
Screwed (15-50A) 1.4 1.03 1.85 3.01 5.04 6.85 11.07
Flap type 1.6 1.17 2.11 3.44 5.76 7.82 12.65
150L-13F 1.8 1.32 2.37 3.87 6.48 8.80 14.23
SCS13 2.0 1.47 2.64 4.31 7.20 9.78 15.82

Pressure Reducing Valve

Flanged (15-100A) 2.5 1.83 3.30 5.38 9.00 12.23 19.77
Plain type 3.0 2.20 3.96 6.46 10.81 14.67 23.72
See page 337 “ Flow Velocity Table for Water inside the Pipe.”

7-3, Futano-cho, Mizuho-ku, Nagoya, 467-0861, Japan Phone: 81-52-881-7199 Fax: 81-52-881-7201 18
www.yoshitake.jp

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 P019-020_減圧 2011.3.9 6:52 PM ページ 1

Ste
am
Pilot type Diaphragm Ductile iron

P r e s s u r e R e d u c i n g V a l v e

GP-2000
Features
1. Large-size diaphragm and external sensing method control
reduced pressure more stably.
2. Since the Cv value is high, flow capability and control capability
are significantly improved, one or two sizes smaller than the
regular nominal size can be applied.
3. Spherical main valve offers great sealability and great reduction of
valve seat leakage (compliant with ANSI Class IV).
4. Pressure management at low pressure (0.02 MPa or less) is
possible. Screwed type Flanged type

Specifications
Model GP-2000
Application Steam
Reduced pressure sensing method External sensing *1
Inlet pressure 0.1-2.0 MPa 0.1-1.0 MPa
0.02-0.15 MPa 0.02-0.15 MPa
*2 *2
Reduced pressure 0.1-1.4 MPa 0.1-0.85 MPa
85% or less of inlet pressure (gauge pressure)
Minimum differential pressure 0.05 MPa
Maximum pressure reduction ratio 20:1
Maximum temperature 220˚C
Valve seat leakage 0.01% or less of rated flow
Body Ductile cast iron
Main valve Stainless steel
Valve seat Stainless steel
Material
Pilot valve Stainless steel
Pilot valve seat Stainless steel
Diaphragm Stainless steel
Reduced pressure sensing pipe Copper pipe φ 8-2 m
Connection JIS Rc screwed JIS 20K RF flanged JIS 10K FF flanged
*1 External sensing is standard. Available with internal sensing type (nominal size: 15A to 100A) in different specifications. Note that Cv value
of internal sensing type is lower than that of external sensing type.
*2 Available with the GP-2000L, reduced pressure of 0.01 to 0.02 MPa, from 15A to 100A, inlet pressure of 0.1 to 0.5 MPa and maximum
pressure reduction of 50:1.
･ Available with external pilot type.
･ Available with ASME or EN flanged.
Pressure Reducing Valve

Dimensions (mm) and Weights (kg)

φ 8 (R 1/4)
●Screwed type
Nominal size d L H1 H A Weight
15A Rc 1/2 150 170 398 200 14.0
d
20A Rc 3/4 150 170 398 200 14.0
H

25A Rc 1 160 175 404 226 18.5

32A Rc 1-1/4 180 192 434 226 21.5
40A Rc 1-1/2 180 192 434 226 21.5 L
H1

50A Rc 2 230 216 498 276 33.0

･ Available with NPT connection.
●Flanged type (JIS 20K RF) φA R 1/4

Nominal size L H1 H A Weight

15A 146 (142) 170 398 200 15.5 ( 15.3)
20A 146 (142) 170 398 200 16.0 ( 15.8) φ 8 (R 1/4)
25A 156 (152) 175 404 226 21.0 ( 20.6)
32A 176 (172) 192 434 226 24.0 ( 23.6)
40A 196 (192) 192 434 226 24.5 ( 24.1)
50A 222 (218) 216 498 276 36.0 ( 35.8)
H

65A 282 (278) 251 552 352 64.5 ( 64.2)

80A 302 (294) 264 575 352 71.5 ( 68.8)
100A 342 (330) 321 658 401 111.0 (106.9) L
H1

125A 400 (388) 321 658 401 115.0 (112.0)

150A 465 (453) 414 814 502 234.3 (230.0)
200A 469 (469) 414 814 502 242.0 (238.0)
φA R 1/4
･ The above values in parentheses are the dimensions of JIS 10K FF flanged.

19 7-3, Futano-cho, Mizuho-ku, Nagoya, 467-0861, Japan Phone: 81-52-881-7199 Fax: 81-52-881-7201
www.yoshitake.jp

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P019-020_減圧 2011.3.9 6:52 PM ページ 2

GP-2000
P r e s s u r e R e d u c i n g V a l v e

Nominal Sizes Selection Chart (For Steam/External Sensing) Specifications Selection Chart
This range requires two-stage pressure reduction.
1.8 2.0 2.0
1.4 1.4
1.6 1.8

P1: Inlet pressure MPa

1.3 1.3 1.6
1.4 Controllable range
1.2 1.4 1.2
1.2
1.1 1.1 1.0
1.2 0.8
Pa
1.0 1.0
0.6
M
e

0.4
P2: Reduced pressure MPa

P2: Reduced pressure MPa

ur

0.9 0.9
The valve does not fulfill specified
s
es

1.0 0.2 performance in this range.

pr

0.8 0.8
t

0.9
nle

0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2 1.3 1.4
:I

0.7 0.7 P2: Reduced pressure MPa

P1

0.8

0.6 0.7 0.6

0.5 0.6 0.5

0.5 (a)
0.4 0.4 Flow Characteristic Chart
0.4
0.3 0.3 Shut-off pressure rise Offset
0.3 (within 0.02 MPa) Within 10% of set pressure
Set Minimum value: 0.02 MPa
0.2 0.2 pressure
0.2

Reduced pressure

Minimum adjustable
0.1 0.1

Rated flow rate

0.1

flow rate
Nominal size
15A
00
20 0 5 50 100%
60 20A
Flow rate
80 (b) 00
30
25A
0 00
10 40
32A

40A 00 Pressure Characteristic Chart

60
0
00
P2: Reduced pressure MPa

20
W: Flow rate kg/h

W: Flow rate kg/h

80
0
50A 00
0 10 0.16
30
0.15
0 0.14
40
0 0.13
65A 00
20 0.12
0
60

Pressure Reducing Valve

80A
0
00 00
8 30 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0
0 0 100A 0 0 P1: Inlet pressure MPa
10 125A 4 00
This chart shows a variation in the reduced pressure
0 0 when the inlet pressure of 1.75 MPa is changed
6 00 between the range from 0.2 MPa to 2.0 MPa with the
0 0
20
0 150A 00 reduced pressure set at 0.14 MPa.
80
200A
0
00 00 00 00 0 0 0 0 0 0
3
40 60 80 00 00 00 00 00 00
10 20 30 40 60 80

[Example]
When selecting the nominal size of a pressure reducing valve whose inlet
pressure (P1), reduced pressure (P2), and flow rate are 0.6 MPa, 0.4 MPa, and
600 kg/h, respectively, first find intersection point (a) of the inlet pressure of
0.6 MPa and the reduced pressure of 0.4 MPa. Trace down vertically from this
intersection point to find intersection point (b) with the flow rate of 600 kg/h.
Since intersection point (b) lies between nominal sizes 20A and 25A, select the
larger one, 25A.
・Set the safety factor at 80 to 90%.

7-3, Futano-cho, Mizuho-ku, Nagoya, 467-0861, Japan Phone: 81-52-881-7199 Fax: 81-52-881-7201 20
www.yoshitake.jp

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 P021-022_減圧 2011.3.9 6:53 PM ページ 1

GP-2000
P r e s s u r e R e d u c i n g V a l v e

GP-2000 Flow Rate Table

(kg/h)

P1 (MPa) P2 (MPa) 15A 20A 25A 32A 40A 50A 65A 80A 100A 125A 150A 200A

0.1-0.9 1,260 1,814 2,746 3,603 4,737 8,064 15,120 19,656 30,240 31,500 63,000 65,520

1 1,232 1,775 2,687 3,525 4,634 7,889 14,792 19,230 29,584 30,817 61,635 64,100
2.0
1.2 1,136 1,636 2,477 3,250 4,273 7,273 13,637 17,729 27,275 28,412 56,824 59,097

1.4 1,012 1,458 2,207 2,896 3,808 6,481 12,153 15,799 24,306 25,319 50,638 52,664

0.1-0.8 1,140 1,641 2,485 3,260 4,286 7,296 13,680 17,784 27,360 28,500 57,000 59,280

0.9 1,113 1,603 2,426 3,183 4,185 7,125 13,359 17,367 26,718 27,832 55,664 57,890

1.8 1 1,067 1,537 2,327 3,053 4,014 6,832 12,810 16,653 25,621 26,688 53,377 55,512

1.2 954 1,374 2,081 2,730 3,590 6,111 11,458 14,895 22,916 23,871 47,742 49,652

1.4 803 1,157 1,751 2,298 3,021 5,143 9,643 12,536 19,287 20,090 40,181 41,788

0.1-0.7 1,020 1,468 2,223 2,917 3,835 6,528 12,240 15,912 24,480 25,500 51,000 53,040

1.6 1 893 1,286 1,947 2,554 3,358 5,716 10,718 13,933 21,436 22,329 44,659 46,445

1.3 664 956 1,448 1,900 2,498 4,253 7,974 10,366 15,949 16,613 33,227 34,556

0.1-0.6 900 1,296 1,962 2,574 3,384 5,760 10,800 14,040 21,600 22,500 45,000 46,800

1.4 1 702 1,011 1,531 2,009 2,642 4,497 8,433 10,962 16,866 17,568 35,137 36,543

1.1 620 893 1,352 1,773 2,331 3,969 7,442 9,675 14,884 15,504 31,009 32,250

0.1-0.5 780 1,123 1,700 2,230 2,932 4,992 9,360 12,168 18,720 19,500 39,000 40,560
1.2
1 477 687 1,040 1,365 1,795 3,055 5,729 7,447 11,458 11,935 23,871 24,826

0.1-0.4 660 950 1,438 1,887 2,481 4,224 7,920 10,296 15,840 16,500 33,000 34,320

1.0 0.5 635 914 1,385 1,817 2,388 4,066 7,623 9,911 15,247 15,883 31,766 33,036

0.8 435 627 950 1,246 1,638 2,789 5,229 6,798 10,459 10,895 21,791 22,663

0.1-0.4 600 864 1,308 1,716 2,256 3,840 7,200 9,360 14,400 15,000 30,000 31,200

0.9 0.5 551 793 1,201 1,576 2,072 3,528 6,615 8,600 13,230 13,782 27,564 28,666

0.7 413 595 901 1,182 1,554 2,646 4,961 6,450 9,923 10,336 20,673 21,500
Pressure Reducing Valve

0.1-0.3 540 777 1,177 1,544 2,030 3,456 6,480 8,424 12,960 13,500 27,000 28,080
0.8
0.5 462 665 1,007 1,322 1,738 2,958 5,547 7,211 11,094 11,556 23,113 24,037

0.1-0.3 480 691 1,046 1,372 1,804 3,072 5,760 7,488 11,520 12,000 24,000 24,960
0.7
0.5 364 525 794 1,042 1,371 2,333 4,375 5,688 8,751 9,115 18,231 18,961

0.1-0.2 420 604 915 1,201 1,579 2,688 5,040 6,552 10,080 10,500 21,000 21,840

0.6 0.3 395 570 862 1,132 1,488 2,533 4,750 6,175 9,500 9,896 19,793 20,584

0.5 248 357 541 710 934 1,590 2,981 3,875 5,963 6,211 12,423 12,919

0.1-0.2 360 518 784 1,029 1,353 2,304 4,320 5,616 8,640 9,000 18,000 18,720

0.5 0.3 308 443 671 881 1,158 1,972 3,698 4,807 7,396 7,704 15,408 16,025

0.4 228 329 498 653 859 1,462 2,742 3,565 5,485 5,713 11,427 11,884

0.05-0.15 300 432 654 858 1,128 1,920 3,600 4,680 7,200 7,500 15,000 15,600
0.4
0.3 206 297 450 591 777 1,323 2,480 3,225 4,961 5,168 10,336 10,750

0.05-0.1 240 345 523 686 902 1,536 2,880 3,744 5,760 6,000 12,000 12480
0.3
0.2 182 262 397 521 685 1,166 2,187 2,844 4,375 4,557 9,115 9,480

0.05 180 259 392 515 677 1,152 2,160 2,808 4,320 4,500 9,000 9,360
0.2
0.1 154 221 335 440 579 986 1,849 2,403 3,698 3,852 7,704 8,012

0.1 0.05 91 131 198 260 342 583 1,093 1,422 2,187 2,278 4,557 4,740

21 7-3, Futano-cho, Mizuho-ku, Nagoya, 467-0861, Japan Phone: 81-52-881-7199 Fax: 81-52-881-7201
www.yoshitake.jp

減圧-03
P021-022_減圧 2011.3.9 6:53 PM ページ 2

Ste
am
Pilot type Diaphragm Ductile iron

P r e s s u r e R e d u c i n g V a l v e

GPK-2001･2003
Features
1. Superior to piston type valve in capacity and
performance. Very effective in controlling inlet
pressure and flow rate fluctuations.
2. Spherical main valve offers great sealability
and great reduction of valve seat leakage
(compliant with ANSI Class IV).
3. Remote control makes pressure adjustment
easy, and the pressure setting is wide.
4. The GPK-2001 and GPK-2003 can be
selected according to the loading air pressure. GPK-2001 screwed type GPK-2003 flanged type

Specifications
Model GPK-2001 GPK-2003
Application Steam
Reduced pressure sensing method External sensing *
JIS Rc
0.1-2.0 MPa 0.25-2.0 MPa
JIS 20K RF
Inlet pressure
JIS 10K FF 0.1-1.0 MPa 0.25-1.0 MPa

0.05-0.9 MPa (0.85 MPa for JIS 10K) 0.2-1.4 MPa (0.85 MPa for JIS 10K)
Reduced pressure
85% or less of inlet pressure (gauge pressure)
Loading air pressure Refer to the loading air pressure-set pressure chart.
Minimum differential pressure 0.05 MPa
Maximum pressure reduction ratio 20:1 10:1
Maximum temperature 220˚C
Valve seat leakage 0.01% or less of rated flow
Body Ductile cast iron
Main valve Stainless steel
Valve seat Stainless steel
Material
Pilot valve Stainless steel
Pilot valve seat Stainless steel
Diaphragm Stainless steel
Reduced pressure detection pipe Copper pipe φ 8-2 m

Pressure Reducing Valve

JIS Rc screwed
Connection
JIS 20K RF and 10K FF flanged
* External sensing is standard. Available with internal sensing type in different specifications. Note that the Cv value of internal sensing type is
lower than that of external sensing type.
･ Available with ASME or EN flanged.

Piping Example
Three-way Air pressure
solenoid valve

Check valve

Standard unit
{Filter・Pressure reducing valve・Pressure gauge・
Manual three-way diverting valve・Needle valve}
Bypass

Safety
valve

Drain
separator

Strainer

GPK-2001/2003
Pressure reducing valve

Trap Sight glass

7-3, Futano-cho, Mizuho-ku, Nagoya, 467-0861, Japan Phone: 81-52-881-7199 Fax: 81-52-881-7201 22
www.yoshitake.jp

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 P023-024_減圧 2011.3.9 6:54 PM ページ 1

GPK-2001・2003
P r e s s u r e R e d u c i n g V a l v e

Dimensions (mm) and Weights (kg)

●GPK-2001 screwed type Rc 1/4 air loading port

Nominal size d L H1 H A Weight

15A Rc 1/2 150 170 335 200 14.0
20A Rc 3/4 150 170 335 200 14.0
25A Rc 1 160 175 341 226 18.5
32A Rc 1-1/4 180 192 371 226 21.5 d

40A Rc 1-1/2 180 192 371 226 21.5

H
50A Rc 2 230 216 435 276 33.0
L

H1
φA

●GPK-2001 flanged type (JIS 20K RF) Rc 1/4 air loading port

Nominal size L H1 H A Weight

15A 146 (142) 170 335 200 15.5 ( 15.3)
20A 146 (142) 170 335 200 16.0 ( 15.8)
25A 156 (152) 175 341 226 21.0 ( 20.6)
32A 176 (172) 192 371 226 24.0 ( 23.4)
40A 196 (192) 192 371 226 24.5 ( 24.1)

H
50A 222 (218) 216 435 276 36.0 ( 35.8)
65A 282 (278) 251 489 352 64.5 ( 64.2)
80A 302 (294) 264 512 352 71.5 ( 69.3) L

H1
100A 342 (330) 321 595 401 111.0 (107.4)
･ The above values in parentheses are the dimensions and weights of JIS 10K FF
flanged.
φA

●GPK-2003 screwed type Rc 1/4 air loading port

Nominal size d L H1 H A Weight

15A Rc 1/2 150 170 353 200 17.5
20A Rc 3/4 150 170 353 200 17.5
25A Rc 1 160 175 359 226 22.0
32A Rc 1-1/4 180 192 389 226 25.0 d
Pressure Reducing Valve

40A Rc 1-1/2 180 192 389 226 25.0 H

50A Rc 2 230 216 453 276 36.5

L
H1

φA

●GPK-2003 flanged type (JIS 20K RF) Rc 1/4 air loading port

Nominal size L H1 H A Weight

15A 146 (142) 170 353 200 19.0 ( 18.8)
20A 146 (142) 170 353 200 19.5 ( 19.3)
25A 156 (152) 175 359 226 24.5 ( 24.1)
32A 176 (172) 192 389 226 27.5 ( 27.1)
40A 196 (192) 192 389 226 28.0 ( 27.6)
H

50A 222 (218) 216 453 276 39.5 ( 39.3)

65A 282 (278) 251 507 352 68.0 ( 67.7)
80A 302 (294) 264 530 352 75.0 ( 72.8) L
H1

100A 342 (330) 321 613 401 114.5 (113.9)

･ The above values in parentheses are the dimensions and weights of JIS 10K FF
flanged.
φA

23 7-3, Futano-cho, Mizuho-ku, Nagoya, 467-0861, Japan Phone: 81-52-881-7199 Fax: 81-52-881-7201
www.yoshitake.jp

減圧-05
P023-024_減圧 2011.3.9 6:54 PM ページ 2

Ste
am
Direct type Diaphragm Ductile iron

P r e s s u r e R e d u c i n g V a l v e

GDK-2000
Features
1. Due to direct acting type the actuating parts are fewer and
structure is simple but robust.
2. Spherical main valve offers great sealability and great
reduction of valve seat leakage (compliant with ANSI Class IV).
3. Large-size diaphragm ensures high Cv value and
distinguished controllability against load fluctuations.
4. Remote operation makes pressure adjustment easy, and the
Flanged type
pressure setting is wide.

Specifications
Model GDK-2000
Application Steam
Reduced pressure sensing method External sensing
Inlet pressure 0.1-2.0 MPa 0.1-1.0 MPa
0.05-1.4 MPa 0.05-0.9 MPa
Reduced pressure
90% or less of inlet pressure (gauge pressure)
Operation air pressure Refer to the loading air pressure-set pressure chart.
Minimum differential pressure 0.05 MPa
Maximum pressure reduction ratio 10:1
Maximum temperature 220˚C
Valve seat leakage 0.01% or less of rated flow
Body Ductile cast iron
Valve Stainless steel
Material
Valve seat Stainless steel
Diaphragm Stainless steel
Reduced pressure sensing pipe Copper pipe φ 8-2 m
Connection JIS Rc screwed JIS 20K RF flanged JIS 10K FF flanged
･ Available with ASME or EN flanged.

Dimensions (mm) and Weights (kg)

●Screwed type

Pressure Reducing Valve

Nominal size d L H1 H A Weight
15A Rc 1/2 150 74 244 200 12.4
Rc 1/4 air loading port Rc 1/4 air loading port
20A Rc 3/4 150 74 244 200 12.4 φA φA
25A Rc 1 160 76 251 226 16.4
32A Rc 1-1/4 180 90 282 226 19.9
40A Rc 1-1/2 180 90 282 226 19.9
50A Rc 2 230 103 319 276 30.5
●Flanged type
H

φ 8 (R 1/4)
H

d
φ 8 (R 1/4)
Nominal size L H1 H A Weight
15A 146 (142) 74 244 200 13.9 ( 13.7)
20A 146 (142) 74 244 200 14.4 ( 14.2)
H1

H1

25A 156 (152) 76 251 226 19.2 ( 18.8)

32A 176 (172) 90 282 226 22.4 ( 22.0)
40A 196 (192) 90 282 226 22.9 ( 22.5) L
L
50A 222 (218) 103 319 276 33.5 ( 33.5)
65A 282 (278) 122 373 352 61.8 ( 61.5) Screwed type Flanged type
80A 302 (294) 135 399 352 69.1 ( 66.9)
100A 342 (330) 167 488 401 108.6 (105.0)
･ The above values in parentheses are the dimensions and
weights of JIS 10K FF flanged.

7-3, Futano-cho, Mizuho-ku, Nagoya, 467-0861, Japan Phone: 81-52-881-7199 Fax: 81-52-881-7201 24
www.yoshitake.jp

減圧-06
 P025-026_減圧 2011.3.9 6:54 PM ページ 1

GP-2000 Series
P r e s s u r e R e d u c i n g V a l v e

Specifications Selection Chart Loading Air Pressure-set Pressure Chart

●GPK-2001・2003 ●GPK-2001・2003
This range requires two-stage pressure reduction. 1.4
2.0 1.3
1.8 1.2
P1: Inlet pressure MPa

1.6 1.1
1.0

Set pressure MPa

1.4 Controllable range
1.2 0.9

03
0.8

0
1.0

K-2
0.8 0.7

GP
0.6
0.6 01
0.5 -20
0.4
G PK
The valve does not fulfill specified 0.4
0.2 performance in this range. 0.3
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2 1.3 1.4 0.2
P2: Reduced pressure MPa 0.1

●GDK-2000 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
This range requires two-stage pressure reduction. Loading air pressure MPa
2.0 Basically, the set pressure to the loading air pressure is as shown in
1.8 the chart above. The set pressure is slightly different depending on
P1: Inlet pressure MPa

1.6 the working conditions. For the actual use, adjust loading air
1.4 Controllable range pressure suitable for the necessary set pressure.
1.2
1.0 ●GDK-2000
0.8 0.24
Nominal size
0.6 100A
0.22
0.4
∆Pa: Loading air pressure (Pa)

The valve does not fulfill specified 0.20 50A

– set pressure (P2) MPa

0.2 performance in this range. 80A

0.18
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2 1.3 1.4 40A
0.16
P2: Reduced pressure MPa 0.14
0.12 32A
65A
0.10
0.08 25A

Flow Characteristic Chart 0.06 20A

15A
(a)
0.04
Shut-off pressure rise (within 0.02 MPa) 0.02
Set
pressure
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8
Reduced pressure

Minimum adjustable

Offset 10% of
Differential pressure (∆P) MPa
set pressure
Rated flow rate

Minimum value: How to read the chart (GDK-2000)

flow rate

0.02 MPa When the nominal size is 25A, the inlet pressure (P1) is 1.0 MPa,
* The minimum
Pressure Reducing Valve

value for the and the reduced pressure (P2) is 0.2 MPa, the loading air pressure is
GDK-2000 is calculated as follows: Trace up vertically from the differential
0.05 MPa. pressure (∆P) before and after the pressure reducing valve (1.0 MPa
0 5 50 100% – 0.2 MPa = 0.8 MPa) to find intersection point (a) with the nominal
Flow rate size of 25A. Calculate ∆Pa [loading air pressure (Pa) – set pressure
(P2)] = 0.037 MPa by horizontally tracing to the left from intersection
point (a). Thus, the loading air pressure is: (Pa) = ∆Pa + P2 = 0.037 +
0.2 = 0.237 MPa.
Pressure Characteristic Chart
●GPK-2001・2003 ●GDK-2000
P2: Reduced pressure MPa

Nominal size
100A
P2: Reduced pressure MPa

0.16 0.3
50A
80A
0.15
0.25 40A
0.14 65A
32A
0.13
0.2
25A
0.12 20A
15A
0.15

0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0
0.1
P1: Inlet pressure MPa
This chart shows variation in reduced pressure when the inlet 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0
pressure of 1.75 MPa is changed between 0.3 MPa and 1.0 MPa P1: Inlet pressure MPa
while the reduced pressure is set at 0.14 MPa. This chart shows variation in reduced pressure when the inlet
pressure of 1.4 MPa is changed between 0.2 MPa and 1.4 MPa
while the reduced pressure is set at 0.14 MPa.

25 7-3, Futano-cho, Mizuho-ku, Nagoya, 467-0861, Japan Phone: 81-52-881-7199 Fax: 81-52-881-7201
www.yoshitake.jp

減圧-07
P025-026_減圧 2011.3.9 6:54 PM ページ 2

Ste
am

P r e s s u r e R e d u c i n g V a l v e

CP-2000 Series 〈combination valve〉

Need to use pressure reducing valves, solenoid valves, temperature regulators or its combination for a
specific purpose, with large space and great cost for installation . . . Have you ever imagined that it may
be helpful if a single valve combines such functions? Yoshitake CP-2000 Series integrates such
functions into a single valve to realize space reduction, cost saving and controllability of plural valves
without efforts.

Reliable ON-OFF system by the CP-2001

■CP-2001
Steam is usually supplied only when required. This means that
steam is controlled as a batch (intermittent) system. Steam
ON/OFF is switched by solenoid valve, however, rapid Power
opening/closing operation of solenoid valve causes various ON: Pressure reduced
problems to other devices such as pressure reducing valve. OFF: Fully closed
To solve such problems, we recommend CP-2001.
From boiler

〔Control example〕
Solenoid valve ON P1 = 1.0 MPa P2 = 0.2 MPa
Solenoid valve OFF P1 = 1.0 MPa P2 = 0 MPa

To equipment

Quicker startup feasible with the CP-2003

Pressure Reducing Valve

■CP-2003
In order to increase the performance and efficiency of the Power
ON: High pressure
system and to save energy, a high-pressure steam line and a OFF: Low pressure
low-pressure steam line are used together. For this purpose two From boiler
or more pressure valves have been used. Air is discharged with
low-pressure steam and then rapidly raised to the intended
Low pressure setting
temperature with high-pressure steam, and regular operation
begins with low-pressure steam.
Our CP-2003 can perform these operations alone.

〔Control example〕
Solenoid valve ON P1 = 1.0 MPa P2 = 0.5 MPa
Solenoid valve OFF P1 = 1.0 MPa P2 = 0.2 MPa

To equipment

7-3, Futano-cho, Mizuho-ku, Nagoya, 467-0861, Japan Phone: 81-52-881-7199 Fax: 81-52-881-7201 26
www.yoshitake.jp

減圧-08
 P027-028_減圧 2011.3.9 6:55 PM ページ 1

CP-2000 Series
P r e s s u r e R e d u c i n g V a l v e

■CP-2001 Pressure reducing valve with

ON-OFF control

Open Pressure reducing valve

Solenoid pilot

Close Main valve closure

Application Steam
Inlet pressure 0.1-1.0 MPa
0.02-0.15 MPa
Reduced pressure
0.1-0.85 MPa
Maximum temperature 183˚C
Actuation of solenoid valve Normally closed
AC 100 V, 50 / 60 Hz available
Rated voltage
AC 200 V, 50 / 60 Hz available
JIS Rc screwed
Connection
JIS 10K flanged
Main valve body Ductile cast iron
Material Main valve, valve seat Stainless steel
Diaphragm Stainless steel
Screwed: 15A-50A
Nominal size
Flanged: 15A-100A
･ Please contact us about other specifications. CP-2001 flanged type

■CP-2002 Pressure reducing valve and

full-open valve

Open Main valve full open

Solenoid pilot

Close Pressure reducing valve

Pressure Reducing Valve

Application Steam
Inlet pressure 0.1-1.0 MPa
0.02-0.15 MPa
Reduced pressure
0.1-0.85 MPa
Maximum temperature 183˚C
Actuation of solenoid valve Normally closed
AC 100 V, 50 / 60 Hz available
Rated voltage
AC 200 V, 50 / 60 Hz available
JIS Rc screwed
Connection
JIS 10K flanged
Main valve body Ductile cast iron
Material Main valve, valve seat Stainless steel
Diaphragm Stainless steel
Screwed: 15A-50A
Nominal size
Flanged: 15A-100A
･ Please contact us about other specifications. CP-2002 flanged type

27 7-3, Futano-cho, Mizuho-ku, Nagoya, 467-0861, Japan Phone: 81-52-881-7199 Fax: 81-52-881-7201
www.yoshitake.jp

減圧-09
P027-028_減圧 2011.3.9 6:55 PM ページ 2

CP-2000 Series
P r e s s u r e R e d u c i n g V a l v e

■CP-2003 Two-point switching of

reduced pressure

Higher setting
Open
reduced pressure
Solenoid pilot
Lower setting
Close
reduced pressure

Application Steam
Inlet pressure 0.1-1.0 MPa
0.02-0.15 MPa
Reduced pressure
0.1-0.85 MPa
Maximum temperature 183˚C
Actuation of solenoid valve Normally closed
AC 100 V, 50 / 60 Hz available
Rated voltage
AC 200 V, 50 / 60 Hz available
JIS Rc screwed
Connection
JIS 10K flanged
Main valve body Ductile cast iron
Material Main valve, valve seat Stainless steel
Diaphragm Stainless steel
Screwed: 15A-50A
Nominal size
Flanged: 15A-100A
･ Please contact us about other specifications. CP-2003 flanged type

■CP-2004 Switching of reduced pressure

with ON-OFF control

Open Higher setting reduced pressure

Open Solenoid pilot B
Close Higher setting reduced pressure
Solenoid pilot A
Open Lower setting reduced pressure
Close Solenoid pilot B
Close Main valve Closure

Pressure Reducing Valve

Application Steam
Inlet pressure 0.1-1.0 MPa
0.02-0.15 MPa
Reduced pressure
0.1-0.85 MPa
Maximum temperature 183˚C
Actuation of solenoid valve Normally closed
AC 100 V, 50 / 60 Hz available
Rated voltage
AC 200 V, 50 / 60 Hz available
JIS Rc screwed
Connection
JIS 10K flanged
Main valve body Ductile cast iron
Material Main valve, valve seat Stainless steel
Diaphragm Stainless steel
Screwed: 15A-50A
Nominal size
Flanged: 15A-100A
･ Please contact us about other specifications. CP-2004 flanged type

7-3, Futano-cho, Mizuho-ku, Nagoya, 467-0861, Japan Phone: 81-52-881-7199 Fax: 81-52-881-7201 28
www.yoshitake.jp

減圧-10
 P029_減圧 2011.3.9 6:56 PM ページ 1

CP-2000 Series
P r e s s u r e R e d u c i n g V a l v e

■CP-2005 Temperature regulating valve

with pressure control

Temperature
Pressure pilot Temperature pilot regulating valve
while reducing pressure

Heating fluid Steam

Application
Heated fluid Water, Oil, Liquid
Inlet pressure 0.1-2.0 MPa
0.02-0.15 MPa
Reduced pressure
0.1-1.4 MPa
Maximum temperature 220˚C
Bulb maximum pressure 1.0 MPa
Temperature adjustment range –8 – 183˚C

JIS Rc screwed
Connection
JIS 10K/20K flanged
Main valve body Ductile cast iron
Material Main valve, valve seat Stainless steel
Diaphragm Stainless steel
Screwed: 15A-50A
Nominal size
Flanged: 15A-100A
･ Please contact us about other specifications. CP-2005 flanged type

■CP-2006 Temperature regulating valve

with ON-OFF control

Temperature
Open regulating valve
Solenoid pilot

Close Main valve closure

Pressure Reducing Valve

Heating fluid Steam

Application
Heated fluid Water, Oil, Liquid
Maximum pressure 1.0 MPa
Maximum temperature 183˚C
Actuation of solenoid valve Normally closed
AC 100 V, 50 / 60 Hz available
Rated voltage
AC 200 V, 50 / 60 Hz available
Bulb maximum pressure 1.0 MPa
Temperature adjustment range –8 – 183˚C

JIS Rc screwed
Connection
JIS 10K flanged
Body Ductile cast iron
Material Main valve, valve seat Stainless steel
Diaphragm Stainless steel
Screwed: 15A-50A
Nominal size
Flanged: 15A-100A CP-2006 flanged type
･ Please contact us about other specifications.

29 7-3, Futano-cho, Mizuho-ku, Nagoya, 467-0861, Japan Phone: 81-52-881-7199 Fax: 81-52-881-7201
www.yoshitake.jp

減圧-11
P030_減圧 2011.3.14 10:02 AM ページ 1

Ste
am
Pilot type Diaphragm Carbon steel

P r e s s u r e R e d u c i n g V a l v e

GP-2000CS
Features
1. Unique patented diaphragms enable superior durability.
2. 200 mesh integral strainer prevents most scale problem on
the pilot valve.
3. The GP-2000 Series, Yoshitake's original pilot-operated
valve, has proven its contribution to various systems.
4. Spherical valve provides a tight seal meeting ANSI Class Ⅳ.
Screwed type Flanged type

Specifications
Model GP-2000CS
Application Steam
Max. inlet pressure 3.0 MPa 1.0 MPa 2.0 MPa 3.0 MPa
0.02-0.15 MPa 0.02-0.15 MPa 0.02-0.15 MPa
0.02-0.15 MPa
0.1-1.4 MPa 0.1-1.4 MPa 0.1-1.4 MPa
Reduced pressure 0.1-0.85 MPa
1.3-2.0 MPa 1.3-1.7 MPa 1.3-2.0 MPa
85% or less of inlet pressure (gauge pressure)
Minimum differential pressure 0.05 MPa
Maximum pressure reduction ratio 20:1
Maximum temperature 260˚C
Valve seat leakage 0.01% or less of rated flow rate
Body Cast carbon steel
Main valve, valve seat Stellite overlaid stainless steel
Material
Pilot valve, pilot valve seat Stainless steel
Diaphragm Stainless steel
Connection JIS Rc screwed JIS 10K FF flanged JIS 20K RF flanged JIS 30K RF flanged
･ Available with ASME or EN flanged.

Dimensions (mm) and Weights (kg)

●JIS Rc screwed
Nominal size d L H H1 Weight
15A Rc 1/2 150 398 170 16

Pressure Reducing Valve

20A Rc 3/4 150 398 170 16
d 25A Rc 1 160 404 175 21.5
H

32A Rc 1-1/4 180 434 192 24

40A Rc 1-1/2 180 434 192 24
50A Rc 2 230 498 216 37
L
H1

●JIS 30K RF flanged

Nominal size L H H1 Weight
15A 240 398 170 18
20A 240 398 170 18
25A 250 404 175 24.5
32A 260 434 192 27
40A 260 434 192 27
H

50A 230 498 216 42

65A 294 552 251 75
80A 314 575 264 84
100A 358 658 321 133
H1

L
･ 15A to 40A are welded flanged.

7-3, Futano-cho, Mizuho-ku, Nagoya, 467-0861, Japan Phone: 81-52-881-7199 Fax: 81-52-881-7201 30
www.yoshitake.jp

減圧-00
 P031_減圧 2011.3.9 6:57 PM ページ 1

GP-2000CS
P r e s s u r e R e d u c i n g V a l v e

Nominal Sizes Selection Chart (For Steam) Specifications Selection Chart

This range requires two-stage pressure reduction (A).
2.6 2.8 3.0 3.0
2.0 2.4 2.0 2.8

P1: Inlet pressure MPa

2.6
1.9 2.2 1.9 2.4
2.2
1.8 1.8 2.0
2.0 1.8
1.7 1.7 1.6
1.4
1.6 1.6 1.2 Controllable range (B)
1.8
1.0
1.5 1.5
P2: Reduced pressure MPa

P2: Reduced pressure MPa

0.8
0.6 The valve does not fulfill specified
1.4 1.6 1.4 0.4 performance in this range (C).
0.2
1.3 1.3
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 2.0
1.2 1.4 1.2
P2: Reduced pressure MPa
1.1 1.1
1.2
Based on the selection chart above, select a pressure
1.0 1.0 reducing valve in the optimum manner. On the selection
0.9 0.9 chart, first find the intersection point of the inlet pressure
1.0
(P1) and the reduced pressure (P2). Two-stage pressure
Pa

0.8 0.9 0.8

M

reduction is required if the intersection point lies in range

e
ur

0.7 0.8 0.7

(A), or the pressures are controllable with a single
s
es

0.6 0.7 0.6 pressure reducing valve if the intersection point is within
pr
t
nle

0.6 range (B). The valve does not fulfill specified

0.5 0.5
:I

0.5 (a) performance in range (C). To adopt two-stage pressure

P1

0.4 0.4
0.4 reduction, separate two pressure reducing valves as far
0.3 0.3 away from each other as possible.
0.3
0.2 0.2
0.2
0.1 0.1
0.1 Flow Characteristic Chart
Nominal size 0
15A 400 Shut-off pressure rise Offset
(within 0.02 MPa) Within 10% of set pressure
Set Minimum value: 0.02 MPa
00 pressure
60 20A 60
00
Reduced pressure

Minimum adjustable

80 (b) 80 00

Rated flow rate

25A 0
10
0 10
flow rate

32A
40A 0
W: Flow rate kg/h

W: Flow rate kg/h

00
20
0 20
0 0 5 50 100%
50A 00
30
0 30 Flow rate
000
40
0 40
65A When selecting a nominal size, set the flow rate at 80 to
0
0 00 90% of the rated flow rate, allowing for the pressure loss
60
80A 60 0
00 and heat loss of the stop valve, strainer, etc. to be used
80
0 80
0 100A before or after the pressure reducing valve. To enable
0 0
Pressure Reducing Valve

1 the pressure reducing valve to show a maximum flow

characteristic, do not select a small piping diameter, as
a countermeasure against the effect of piping
00
20 resistance. Select a nominal size based on the nominal
sizes selection chart.
00
30 00 00 00 00 0 0 0 0 0
40 60 80 100 00 00 00 00 00
20 30 40 60 80
[Example] Pressure Characteristic Chart
When selecting the nominal size of a pressure reducing valve whose inlet
P2: Reduced pressure MPa

pressure (P1), reduced pressure (P2), and flow rate are 0.6 MPa, 0.4 MPa, and
600 kg/h, respectively, first find intersection point (a) of the inlet pressure of 0.16
0.6 MPa and the reduced pressure of 0.4 MPa. Trace down vertically from this 0.15
intersection point to find intersection point (b) with the flow rate of 600 kg/h. 0.14
Since intersection point (b) lies between nominal sizes 20A and 25A, select the 0.13
0.12
larger one, 25A.
･ Set the safety factor at 80 to 90%.
0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0
P1: Inlet pressure MPa
This chart shows variation in reduced pressure when the
inlet pressure of 1.75 MPa is changed between 0.2 MPa
and 2.0 MPa while the reduced pressure is set at
0.14 MPa.

31 7-3, Futano-cho, Mizuho-ku, Nagoya, 467-0861, Japan Phone: 81-52-881-7199 Fax: 81-52-881-7201
www.yoshitake.jp

減圧-11
P032-033_減圧 2011.3.9 6:58 PM ページ 1

Ste
am
Pilot type Piston Ductile iron

P r e s s u r e R e d u c i n g V a l v e

GP-1000

GP-1000･1002 GP-1200 GP-1010 GP-1001

Features
1. Significantly improved workability and durability compared with conventional pressure reducing valves.
2. Spherical main valve offers great sealability and great reduction of valve seat leakage (compliant with
ANSI Class IV).
3. Compliant with SHASE-S106 Pressure Reducing Valves (by the Society of Heating, Air-Conditioning
and Sanitary Engineers of Japan).
4. Simple and robust internal structure.

Description of GP-1000 Series model code

GP-1000
Material, S: trim parts made of stainless steel,
SS: wetted parts made of stainless steel, AS: all stainless steel

Pressure Reducing Valve

0: standard, 1: equipped with a handle,
2: for low pressure
0: flanged, 1: screwed
0: standard, 2: air loading type

Specifications
Model GP-1000･1001 GP-1002 GP-1010 GP-1200 GP-1210
Application Steam
Inlet pressure 0.1-1.0 MPa 0.1-0.5 MPa 0.1-1.0 MPa
0.05-0.9 MPa 0.03-0.15 MPa 0.05-0.9 MPa
Reduced pressure
90% or less of inlet pressure (gauge pressure)
Minimum differential pressure 0.05 MPa
Maximum pressure reduction ratio 20:1
Maximum temperature 220˚C
Valve seat leakage 0.01% or less of rated flow
Body Ductile cast iron
Material Valve, valve seat Stainless steel
Piston, cylinder Brass or bronze
Connection JIS 10K FF flanged JIS Rc screwed JIS 10K FF flanged JIS Rc screwed
･ Available with trim parts (piston and cylinder) made of stainless steel (GP-□□□□S).

7-3, Futano-cho, Mizuho-ku, Nagoya, 467-0861, Japan Phone: 81-52-881-7199 Fax: 81-52-881-7201 32
www.yoshitake.jp

減圧-14
 P032-033_減圧 2011.3.9 6:58 PM ページ 2

GP-1000 Series
P r e s s u r e R e d u c i n g V a l v e

Dimensions (mm) and Weights (kg)

●GP-1000・1002
Nominal size L H1 H Weight
15A 150 64 285 8.0
20A 155 64 285 8.5
25A 160 67 300 10.0
32A 190 82 323 14.0
40A 190 82 323 14.5

H
50A 220 93 347 20.0
65A 245 100 357 30.0
80A 290 122 404 35.0
100A 330 144 450 52.5

H1
L

●GP-1010
Nominal size d L H1 H Weight
15A Rc 1/2 150 64 285 7.0
20A Rc 3/4 155 64 285 7.0
25A Rc 1 160 67 300 8.5
32A Rc 1-1/4 190 82 323 12.0
40A Rc 1-1/2 190 82 323 12.5

H
50A Rc 2 220 93 347 18.0
d

H1
L

●GP-1200
Nominal size L H1 H Weight
15A 150 64 220 8.0
20A 155 64 220 8.5
25A 160 67 235 10.0
32A 190 82 258 14.0
Pressure Reducing Valve

40A 190 82 258 14.5

H
50A 220 93 282 20.0
65A 245 100 292 30.0
80A 290 122 339 35.0
100A 330 144 385 52.5
H1

●GP-1210
Nominal size d L H1 H Weight
15A Rc 1/2 150 64 220 7.0
20A Rc 3/4 155 64 220 7.0
25A Rc 1 160 67 235 8.5
32A Rc 1-1/4 190 82 258 12.0
40A Rc 1-1/2 190 82 258 12.5
H

50A Rc 2 220 93 282 18.0

d
H1

33 7-3, Futano-cho, Mizuho-ku, Nagoya, 467-0861, Japan Phone: 81-52-881-7199 Fax: 81-52-881-7201
www.yoshitake.jp

減-00
P034-035_減圧 2011.3.9 6:58 PM ページ 1

Ste
am
Pilot type Piston Stainless steel

P r e s s u r e R e d u c i n g V a l v e

GP-1000SS・1000AS
Features
1. Improved corrosion resistance by stainless steel wetted parts (GP-1000SS) or all stainless steel made
(GP-1000AS).
2. Spherical main valve offers great sealability and great reduction of valve seat leakage (compliant with
ANSI Class IV).
3. Compliant with SHASE-S106 Pressure Reducing Valves (by the Society of Heating, Air-Conditioning
and Sanitary Engineers of Japan).

Specifications
Stainless steel
All stainless steel made
wetted parts
Model GP-1000SS GP1000AS
Application Steam
Inlet pressure 0.1-1.0 MPa
0.05-0.9 MPa
Reduced pressure
90% or less of inlet pressure (gauge pressure)
Minimum differential pressure 0.05 MPa
Maximum pressure reduction ratio 20:1
Maximum temperature 220˚C
Valve seat leakage 0.01% or less of rated flow
Body Cast stainless steel
Material Valve, valve seat Stainless steel
Piston, cylinder Stainless steel
Connection JIS 10K FF flanged

GP-1000AS

Dimensions (mm) and Weights (kg)

Nominal size L H1 H Weight

Pressure Reducing Valve

15A 150 288 (298) 67 8.3 ( 8.5)
20A 155 288 (298) 67 8.8 ( 9.0)
25A 160 303 (313) 70 10.5 (10.7)
32A 190 326 (336) 85 14.8 (15.0)
40A 190 326 (336) 85 15.3 (15.5)
50A 220 350 (360) 96 20.8 (21.0)
H

65A 245 360 (370) 103 27.4 (27.6)

80A 290 407 (417) 125 38.8 (39.0)
100A 330 454 (464) 148 54.5 (54.7)
・The values in parentheses are the dimensions and weights of the GP-1000AS.
H1

7-3, Futano-cho, Mizuho-ku, Nagoya, 467-0861, Japan Phone: 81-52-881-7199 Fax: 81-52-881-7201 34
www.yoshitake.jp

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 P034-035_減圧 2011.3.9 6:58 PM ページ 2

GP-1000 Series
P r e s s u r e R e d u c i n g V a l v e

Table of Corrected Cv Values

●Table of rated Cv values (Cv value when the correction factor C = 1)
Nominal size 15A 20A 25A 32A 40A 50A 65A 80A 100A
Cv values 1 2.3 4 6.5 9 16 25 36 64
Note) When the inlet pressure is more than 0.7 MPa and the pressure reduction ratio is more than 10:1, calculate the corrected Cv value by
multiplying the rated Cv value by the correction factor C obtained from Fig. 1.

C: Correction factor
1.0
7 0.8
Nominal Sizes Selection Chart (For Steam) 0.
0.9 0.9 a
MP
1.0 su
re
1.0 1.0 0.8
p res
et
Inl
0.9 1.0 0.9 0.7 P1:

0.8 0.9 0.8

0 0.02 0.04 0.06 0.08 0.1
P2: Reduced pressure MPa

P2: Reduced pressure MPa

0.8 P2: Reduced pressure MPa
0.7 0.7
Pa

Fig. 1: Corrected Cv value

M

0.7
re

0.6 0.6
su
es

0.6
0.5 0.5
Pr
let

0.5 （A）
n

0.4 0.4
：I
P1

0.4
0.3
0.3
0.3
Specifications Selection Chart
0.2 0.2
This range requires two-stage pressure reduction.
 
0.2
0.1 （D） 0.1 1.0
0.1
（C）
0 0
Inlet pressure MPa
0.8
Nominal 15A （A）
10 size 200
0.6
300
20A 400 0.4
20 （C）
600 The valve does not fulfill specified
30 25A 0.2 performance in this range.
W: Flow rate kg/h

W: Flow rate kg/h

40 800 （B）
0
32A 100 0
60
0.03 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9
（E）
40A Reduced pressure MPa
80 0
200
100 （B） Find the intersection point of the inlet and reduced
50A
3 000 pressures. If the intersection point is within any of the
0 ranges shown in the chart above, the pressures are
400
200 65A
controllable.
0
80A 600
300 ･ Range (A) and (C): GP-1000 Series except
Pressure Reducing Valve

0 0 0
8 GP-1002 and 1012
400 00
100A 100 ･ Range (B) and (C): GP-1002 and 1012
600
800 100
0
200
0
300
0
400
0
600
0
800
0 00
100

[Example 1]
When selecting the nominal size of a pressure reducing valve whose inlet
pressure (P1), reduced pressure (P2), and steam flow rate are 0.6 MPa,
0.4 MPa, and 800 kg/h, respectively, first find intersection point (A) of the inlet
pressure of 0.6 MPa and the reduced pressure of 0.4 MPa. Trace down
vertically from this intersection point to find intersection point (B) with the flow
rate of 800 kg/h. Since intersection point (B) lies between nominal sizes 40A
and 50A, select the larger one, 50A.

[Example 2]
When selecting the nominal size of a pressure reducing valve whose inlet
pressure (P1), reduced pressure (P2), and steam flow rate are 0.8 MPa,
0.05 MPa, and 600 kg/h, respectively, first find intersection point (C) of the inlet
pressure of 0.8 MPa and the diagonal line. Trace down to the left from this
intersection point to find intersection point (D) with the reduced pressure of
0.05 MPa.
Trace down vertically from intersection point (D) to find intersection point (E)
with the flow rate of 600 kg/h. Since intersection point (E) lies between nominal
sizes 32A and 40A, select the larger one, 40A.
･ Set the safety factor at 80 to 90%.

35 7-3, Futano-cho, Mizuho-ku, Nagoya, 467-0861, Japan Phone: 81-52-881-7199 Fax: 81-52-881-7201
www.yoshitake.jp

減圧-00
P036-037_減圧 2011.3.9 6:59 PM ページ 1

GP-1000 Series
P r e s s u r e R e d u c i n g V a l v e

Flow Characteristic Chart Pressure Characteristic Chart

Shut-off pressure rise 0.16

Reduced pressure MPa

Set (within 0.02 MPa)
pressure 0.14
Reduced pressure

Minimum adjustable

Offset

Rated flow rate

0.12
(Within 0.05 MPa)
flow rate

* Within 0.03 MPa

when the set pressure 0.10
is less than 0.1 MPa
0.08

0 5 50 100 ％
0 0.2 0.4 0.6 0.8 1.0
Flow rate
Inlet pressure MPa
This chart shows variation in reduced pressure when the inlet
pressure of 1.0 MPa is changed between 0.3 MPa and 1.0 MPa
while the reduced pressure is set at 0.1 MPa.

Loading Air Pressure-set Pressure Chart (GP-1200・1210)

1.0 Basically, the set pressure to the loading air pressure is as shown on the left.
The set pressure is slightly different depending on the conditions. For the actual use,
adjust the loading air pressure suitable for necessary set pressure.
0.8
Set pressure MPa

0.6

0.4

0.2

0 0.2 0.4 0.6 0.8 1.0

Loading air pressure MPa

Pressure Reducing Valve

7-3, Futano-cho, Mizuho-ku, Nagoya, 467-0861, Japan Phone: 81-52-881-7199 Fax: 81-52-881-7201 36
www.yoshitake.jp

減圧-18
 P036-037_減圧 2011.3.9 6:59 PM ページ 2

GP-1000 Series
P r e s s u r e R e d u c i n g V a l v e

GP-1000 Flow Rate Table

(kg/h)

P1 (MPa) P2 (MPa) 15A 20A 25A 32A 40A 50A 65A 80A 100A

0.05 * 92 212 369 600 831 1,478 2,310 3,326 5,913

0.1-0.4 132 303 528 858 1,188 2,112 3,300 4,752 8,448

0.5 127 292 508 825 1,143 2,033 3,176 4,574 8,132

1 0.6 116 268 467 760 1,052 1,871 2,923 4,210 7,484

0.7 104 239 416 676 936 1,664 2,601 3,745 6,659

0.8 87 200 348 566 784 1,394 2,179 3,137 5,578

0.9 63 145 252 410 568 1,010 1,578 2,273 4042

0.1-0.4 120 276 480 780 1,080 1,920 3,000 4,320 7,680

0.5 110 253 441 716 992 1,764 2,756 3,969 7,056

0.9 0.6 98 226 393 639 885 1,574 2,460 3,543 6,299

0.7 82 190 330 537 744 1,323 2,067 2,976 5,292

0.8 60 138 240 390 540 961 1,501 2,162 3,844

0.1-0.3 108 248 432 702 972 1,728 2,700 3,888 6,912

0.4 103 237 412 670 928 1,650 2,578 3,712 6,600

0.8 0.5 92 212 369 600 832 1,479 2,311 3,328 5,916

0.6 77 179 311 506 701 1,247 1,949 2,806 4,989

0.7 56 130 227 369 511 909 1,420 2,045 3,636

0.1-0.3 96 220 384 624 864 1,536 2,400 3,456 6,144

0.4 86 197 344 559 774 1,377 2,151 3,098 5,508

0.7
0.5 72 167 291 474 656 1,166 1,823 2,625 4,667

0.6 53 122 213 346 480 854 1,334 1,921 3,416

0.1-0.2 84 193 336 546 756 1,344 2,100 3,024 5,376

0.3 79 182 316 514 712 1,266 1,979 2,850 5,067

0.6
Pressure Reducing Valve

0.4 67 155 270 438 607 1,080 1,687 2,430 4,321

0.5 49 114 198 322 447 795 1,242 1,788 3,180

0.1-0.2 72 165 288 468 648 1,152 1,800 2,592 4,608

0.5 0.3 61 141 246 400 554 986 1,540 2,218 3,944

0.4 45 105 182 297 411 731 1,142 1,645 2,925

0.1 60 138 240 390 540 960 1,500 2,160 3,840

0.4 0.2 55 126 220 358 496 882 1,378 1,984 3,528

0.3 41 95 165 268 372 661 1,033 1,488 2,646

0.1 48 110 192 312 432 768 1,200 1,728 3,072

0.3
0.2 36 83 145 237 328 583 911 1,312 2,333

0.2 0.1 30 70 123 200 277 493 770 1,109 1,972

0.1 0.05 18 41 72 118 164 291 455 656 1,166

* When the inlet pressure is more than 0.7 MPa and the pressure reduction ratio is more than 10:1, calculate the corrected Cv value
multiplying the rated Cv value by the correction factor C obtained from Fig.1.

37 7-3, Futano-cho, Mizuho-ku, Nagoya, 467-0861, Japan Phone: 81-52-881-7199 Fax: 81-52-881-7201
www.yoshitake.jp

減圧-00
P038-039_減圧 2011.3.9 7:00 PM ページ 1

Ste
am
Pilot type Piston Ductile iron

P r e s s u r e R e d u c i n g V a l v e

GP-1000EN・1000H
Features
1. The GP-1000EN can be replaced easily from existing valve because it complies with face-to-face
dimensions of the EN standard.
2. Respond very sharply to the fluctuation of inlet pressure and the change of the flow rate, so that the
reduced pressure can be kept at a constant level.
3. Pressure adjustment is easy, and the set pressure range is wide.
4. Compliant with the standard of SHASE-S106 Pressure Reducing Valves (by the Society of Heating,
Air-Conditioning and Sanitary Engineers of Japan).

Specifications
Model GP-1000EN GP-1000H
Application Steam
Inlet pressure 0.1-1.6 MPa
(A) 0.05-0.9 MPa (B) 0.9-1.4 MPa
Reduced pressure
90% or less of inlet pressure (gauge pressure)
Minimum differential pressure 0.05 MPa
Maximum pressure reduction ratio 20:1
Maximum temperature 220˚C
Valve seat leakage 0.01% or less of rated flow rate
Body Ductile cast iron
Main valve, valve seat Stainless steel
Material Pilot valve, pilot valve seat Stainless steel
Piston, cylinder Stainless steel
Diaphragm Stainless steel
JIS 16K FF flanged
Connection EN1092 PN25
ASME Class 300 flanged GP-1000H
･ Available with JIS Rc screwed (GP-1010H).

Dimensions (mm) and Weights (kg)

L Weight
Nominal size H H1
GP-1000H GP-1000EN GP-1000EN GP-1000H
15A 150 150 ( - ) 291 64 8.0 8.0 ( - )
20A 150 155 ( - ) 291 64 8.5 8.5 ( - )

Pressure Reducing Valve

25A 160 160 (160) 300 67 10.0 10.0 (10.0) H

32A 180 190 (180) 333 82 14.0 14.0 (14.0)

40A 200 190 (200) 333 82 15.5 14.5 (15.5)
50A 230 220 (230) 353 93 21.0 20.0 (21.0)
65A 290 245 (278) 357 100 30.0 30.0 (30.0)
H1

80A 310 290 (310) 404 122 37.0 35.0 (37.0)

100A 350 330 (350) 450 144 57.0 52.5 (57.0)
L
･ The values in parentheses are the dimensions of ASME Class 300 flanged.

Specifications Selection Chart

This range requires two-stage pressure reduction (B).
1.6

1.4
(A)
Inlet pressure MPa

1.2

1.0

0.8

0.6

0.4 The valve does not fulfill specified

performance in this range (C). Find the intersection point of the inlet and reduced pressures. If the
0.2 intersection point is within range (A) in the chart, the pressures are
controllable with a single pressure reducing valve. They can be controlled
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2 1.3 1.4 by two-stage pressure reduction if the intersection point is within range
Reduced pressure MPa (B). The valve does not fulfill specified performance in range (C).

7-3, Futano-cho, Mizuho-ku, Nagoya, 467-0861, Japan Phone: 81-52-881-7199 Fax: 81-52-881-7201 38
www.yoshitake.jp

減圧-20
 P038-039_減圧 2011.3.9 7:00 PM ページ 2

GP-1000EN・1000H
P r e s s u r e R e d u c i n g V a l v e

Table of Corrected Cv Values

●Table of rated Cv values (Cv value when the correction factor C = 1)
Nominal size 15A 20A 25A 32A 40A 50A 65A 80A 100A
Cv values 1 2.3 4 6.5 9 16 25 36 64
Note) When the reduced pressure is within either of the ranges shown below, calculate the corrected Cv value by multiplying the rated Cv
value by the correction factor C obtained from the Fig.1.
･ When the inlet pressure is between 0.7 MPa and 1.0 MPa and the pressure reduction ratio is more than 10:1
･ When the inlet pressure is more than 1.0 MPa and the reduced pressure is 0.4 MPa or less

Nominal Sizes Selection Chart (For Steam) 1.0

C: Correction factor
0.7
1.5 1.5
0.9
1.1 1.2 1.6
1.4 1.6 1.4 0.8 1.3 1.4 1.5
0.8
1.5 a
1.3 1.3 0.9 MP
re
1.4 0.7 1.0
ssu
1.2 1.2 pre
et
1.3 0.6 Inl
1.1 1.1 P1:
1.2
0.5
1.0 1.1 1.0
P2: Reduced pressure MPa

P2: Reduced pressure MPa

0.4
0.9 1.0 0.9 0.00 0.05 0.10 0.15 0.20 0.25 0.30 0.35 0.40

0.8 0.9 0.8

P2: Reduced pressure MPa
Fig. 1: Corrected Cv value
Pa

0.7 0.8 0.7

M
re

0.7
su

0.6 0.6
es

0.6
pr

0.5 0.5 Pressure Characteristic Chart

et

0.5 (A)
nl
:I

0.4 0.4
P1

0.4 0.16
0.3 0.3
Reduced pressure MPa

0.3 0.14
0.2 0.2
0.2
0.1 0.1 0.12
0.1
0 (D) (C) 0 0.10
Nominal
size
15A 300 0.08
10
0
40
0 0.06
60
20 20A
0
80
00 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6
30 25A 10
Inlet pressure MPa
W: Flow rate kg/h

W: Flow rate kg/h

40
32A This chart shows variation in reduced pressure when the
00
60 (E) 20
40A inlet pressure of 1.0 MPa is changed between 0.3 MPa
80 00
30 and 1.6 MPa while the reduced pressure is set at
100 (B) 00
50A 40 0.1 MPa.
Pressure Reducing Valve

00
65A 60
0 00
20 0
8 0
80A 00
30
0 10 Flow Characteristic Chart
0
40 100A
0
60
Set Shut-off pressure rise
0 00 00 00 00 00 00 0
80 10 20 30 40 60 80 00 pressure Offset
10
Minimum adjustable
Reduced pressure

pressure
Rated flow rate

[Example 1]
flow rate

When selecting the nominal size of a pressure reducing valve whose inlet
pressure (P1), reduced pressure (P2), and steam flow rate are 0.6 MPa,
0.4 MPa, and 800 kg/h, respectively, first find intersection point (A) of the inlet
pressure of 0.6 MPa and the reduced pressure of 0.4 MPa. Trace down
vertically from this intersection point to find intersection point (B) with the flow 0 5 20 40 60 80 100 %
rate of 800 kg/h. Since intersection point (B) lies between nominal sizes 40A Flow rate
and 50A, select the larger one, 50A. ･ Shut-off pressure rise: Within 0.02 MPa
･ Offset pressure: Within 0.03 MPa
[Example 2] (when the set pressure is between
When selecting the nominal size of a pressure reducing valve whose inlet 0.05 MPa and 0.1 MPa)
pressure (P1), reduced pressure (P2), and steam flow rate are 0.8 MPa, Within 0.05 MPa
0.05 MPa, and 600 kg/h, respectively, first find intersection point (C) of the inlet (when the set pressure is more than
pressure of 0.8 MPa and the diagonal line. Trace down to the left from this 0.1 MPa and 1.4 MPa or less)
diagonal line to find intersection point (D) with the reduced pressure of
0.05 MPa. Trace down vertically from intersection point (D) to find intersection
point (E) with the flow rate of 600 kg/h. Since intersection point (E) lies between
nominal sizes 32A and 40A, select the larger one, 40A.
･ Set the safety factor at 80 to 90%.

39 7-3, Futano-cho, Mizuho-ku, Nagoya, 467-0861, Japan Phone: 81-52-881-7199 Fax: 81-52-881-7201
www.yoshitake.jp

減圧-00
P040-041_減圧 2011.3.9 7:00 PM ページ 1

Ste
am
Pilot type Piston Ductile iron

P r e s s u r e R e d u c i n g V a l v e

GP-27
Features
1. Large capacity and distinguished performance. Can respond very immediately to the fluctuation of inlet
pressure and the change of flow rate to keep reduced pressure at a constant level.
2. Quite simple structure, less prone to fail and easy to handle.
3. Easy pressure adjustment and wide set pressure range.
4. No need for auxiliary power (air or electricity). Compactness makes plumbing work easy.
5. Compliant with SHASE-S106 Pressure Reducing Valves (by the Society of Heating, Air-Conditioning
and Sanitary Engineers of Japan).

Specifications
Model GP-27
Application Steam
Inlet pressure 0.1-1.0 MPa
0.03-0.8 MPa
Reduced pressure
80% or less of inlet pressure (absolute pressure)
Minimum differential pressure 0.07 MPa
Maximum pressure reduction ratio 10:1
Maximum temperature 220˚C
Valve seat leakage 0.05% or less of rated flow rate
Body Ductile cast iron
Main valve, valve seat Stainless steel
Material Pilot valve, pilot valve seat Stainless steel
Piston, cylinder Bronze
Diaphragm Stainless steel
Connection JIS 10K FF flanged
･ Available with trim parts (piston and cylinder) made of stainless steel.

Dimensions (mm) and Weights (kg)

Nominal size L H H1 Weight
125A 375 627 162 90.0

Pressure Reducing Valve

150A 420 686 190 135.0
200A 490 765 220 204.0 H
H1

7-3, Futano-cho, Mizuho-ku, Nagoya, 467-0861, Japan Phone: 81-52-881-7199 Fax: 81-52-881-7201 40
www.yoshitake.jp

減圧-22
 P040-041_減圧 2011.3.9 7:00 PM ページ 2

GP-27
P r e s s u r e R e d u c i n g V a l v e

Nominal Sizes Selection Chart (For Steam) Specifications Selection Chart

This range requires two-stage pressure reduction (A).
1.2 1.2 1.0

1.1 1.1

P1: Inlet pressure MPa

0.8
P2: Reduced pressure MPa

P2: Reduced pressure MPa

1.0 1.0
0.9 0.9 Controllable range (B)
0.6
0.8 1.0 0.8

Pa
M
0.7 e 0.9 0.7
0.4
r
su

0.6 0.8 0.6

es

0.7 The valve does not fulfill specified

pr

0.5 0.5 performance in this range (C).

0.6 0.2
et

(a)
nl

0.4 0.4
:I

0.5
P1

0.3 0.4 0.3 0

0.3 0.2 0.03 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8
0.2
P2: Reduced pressure MPa
0.1 0.2 0.1
Based on the selection chart shown above, select a
W: Flow rate kg/h

W: Flow rate kg/h

0 pressure reducing valve in the optimum manner. On the
00
Nominal size 40
0 selection chart, find the intersection point of the inlet
80 125A 00
0
00 (b) 60 pressure (P1) and the reduced pressure (P2). Two-stage
10 0 0 0
150A 80 00 pressure reduction is required if the intersection point
00 lies in range (A), or the pressures are controllable with a
10
00 single pressure reducing valve if the intersection point is
20 200A
00 within range (B). The valve does not fulfill specified
30
00 performance in range (C). To adopt two-stage pressure
40 00 00 0 0 0 0 0 0 0
60 80 00 00 00 00 00 00 00 reduction, separate two pressure reducing valves as far
10 20 30 40 60 80 100
away from each other as possible (preferably at least 3
[Example] meters).
When selecting the nominal size of a pressure reducing valve whose inlet
pressure (P1), reduced pressure (P2), and steam flow rate are 0.6 MPa,
0.4 MPa, and 8000 kg/h, respectively, first find intersection point (a) of the inlet
pressure of 0.6 MPa and the reduced pressure of 0.4 MPa. Trace down
vertically from this intersection point to find intersection point (b) with the flow Pressure Characteristic Chart
rate of 8000 kg/h. Since intersection point (b) lies between nominal sizes 125A
and 150A, select the larger one, 150A. 0.22
･ Set the safety factor at 80 to 90%.
Reduced pressure MPa

0.20

0.18

0.16
Flow Characteristic Chart
0.14
Shut-off pressure rise Offset pressure
(within 0.02 MPa) (within 0.05 MPa) 0.12
Set
pressure
Reduced pressure

Minimum adjustable

0 0.2 0.4 0.6 0.8 1.0

Pressure Reducing Valve

Inlet pressure MPa

flow rate

Rated flow rate

This chart shows variation in reduced pressure when

the inlet pressure of 0.3 MPa is changed between
0.3 MPa and 1.0 MPa while the reduced pressure is
set at 0.2 MPa.

0 5 20 40 60 80 100%
Flow rate

41 7-3, Futano-cho, Mizuho-ku, Nagoya, 467-0861, Japan Phone: 81-52-881-7199 Fax: 81-52-881-7201
www.yoshitake.jp

減圧-00
P042-043_減圧 2011.3.9 7:01 PM ページ 1

Bronze Ste
am
Direct type Bellows Stainless steel

P r e s s u r e R e d u c i n g V a l v e

GD-30・30S
Features
1. Sophisticated design, compact and lightweight.
2. Simple structure, great durability and easy maintenance.
3. Easy to install due to screwed connections.
4. Pressure adjustment is handle-operated without any tool.
5. Highly wear-resistance and durability of stainless steel made
valve and valve seat.
6. A screen (60 mesh) is incorporated to protect the valve and
valve seat from dirt.
7. Excellent workability accomplished by the external pressure GD-30
type bellows of pressure sensing part.
Specifications
Model GD-30 GD-30S
Nominal size 15A-25A 40A･50A 15A-25A
Application Steam
Inlet pressure 1.7 MPa or less 2.0 MPa or less
(A) 0.02-0.1 MPa
Reduced pressure (B) 0.05-0.4 MPa
(C) 0.35-1.0 MPa
Minimum differential pressure 0.05 MPa
Maximum pressure reduction ratio 10:1
Maximum temperature 210˚C 220˚C
Valve seat leakage 0.1% or less of rated flow rate
Body Cast bronze Cast stainless steel (SCS14A)
Material Valve, valve seat Stainless steel
Bellows Phosphor bronze Stainless steel GD-30S
Connection JIS Rc screwed

Dimensions (mm) and Weights (kg) Nominal Sizes Selection Chart (For Steam)
1.1 1.2 1.3 1.7 2.0
1.0
Nominal size d L H H1 Weight 1.0

15A Rc 1/2 80 191 (196) 47 (50.5) 1.9 0.9

20A Rc 3/4 85 191 (196) 47 (50.5) 1.9

P2: Reduced pressure MPa

0.8
0.8
25A Rc 1 95 191 (196) 47 (50.5) 2.0

Pressure Reducing Valve

0.7
40A Rc 1-1/2 140 307 77 10.1 0.7

50A Rc 2 150 307 77 10.4 0.6

0.6

･ The values in parentheses are the dimensions of the GD-30S. 0.5

0.5

0.4
Pa

0.4
M
re
su

0.3
es
pr

0.3
et
nl
:I

0.2
P1

0.2

0.1

0 Nominal
size
0 20 40 60 80 100 120 140 160 180 200 220 240 260
15A
0 30 60 90 120 150 180 210 240 270 300
20A
0 50 100 150 200 250 300 350 400 450 500
25A
0 100 200 300 400 500 600 700 800 900 1000 1100
H

40A
0 200 400 600 800 1000 1200 1400 1600
50A

W: Flow rate kg/h

d
[Example]
When selecting the nominal size of a pressure reducing valve whose inlet
pressure (P1), reduced pressure (P2), and flow rate are 1.3 MPa, 0.6 MPa,
and 200 kg/h, respectively, first find the intersection point of the inlet
H1

pressure of 1.3 MPa and the reduced pressure of 0.6 MPa. Trace down
vertically from this intersection point to find the nominal size with a flow rate
of 200 kg/h or over. In this case, the nominal size is 20A.
L Note) The nominal sizes selection chart is based on measured data. As
you can see, there is no specific relationship between the pressure
difference and the flow rate in the chart above, and it is, therefore,
impossible to calculate a fixed Cv value.
･ Set the safety factor at 80 to 90%.

7-3, Futano-cho, Mizuho-ku, Nagoya, 467-0861, Japan Phone: 81-52-881-7199 Fax: 81-52-881-7201 42
www.yoshitake.jp

減圧-24
 P042-043_減圧 2011.3.9 7:01 PM ページ 2

Ste
am
Direct type Bellows Ductile iron

P r e s s u r e R e d u c i n g V a l v e

GD-45P・45
Features
1. Compact and lightweight.
2. Simple structure and easy maintenance.
3. Applicable to inlet pressure of up to 2.0 MPa.
4. A screen (60 mesh) is incorporated to protect the valve and
valve seat from dirt.
5. Excellent workability accomplished by the external pressure
type bellows of pressure sensing part.
6. Pressure adjustment is handle-operated without any tool
(GD-45P).
GD-45P

Specifications
Model GD-45P・45
Application Steam
Inlet pressure 2.0 MPa or less
(A) 0.02-0.1 MPa
Reduced pressure (B) 0.05-0.4 MPa
(C) 0.35-1.0 MPa
Minimum differential pressure 0.05 MPa
Maximum pressure reduction ratio 10:1
Maximum temperature 220˚C
Valve seat leakage 0.1% or less of rated flow rate
Body Ductile cast iron
Material Valve, valve seat Stainless steel
Bellows Phosphor bronze
Connection JIS Rc screwed GD-45

Dimensions (mm) and Weights (kg) Chart for Selecting Nominal Sizes
1.1 1.2 1.3 1.7 2.0
Nominal size d L H1 H Weight 1.0
1.0
15A Rc 1/2 111 47 213 (216) 3.2
0.9
20A Rc 3/4 111 47 213 (216) 3.2 0.9
25A Rc 1 111 47 213 (216) 3.2
0.8
Pressure Reducing Valve

･ The above values in parentheses are the dimensions of the GD-45. 0.8
P2: Reduced pressure MPa

0.7
0.7

0.6
0.6

0.5
0.5

0.4
Pa
0.4 M
e
s ur
0.3
es
H
H

0.3
t pr
n le
0.2 :I
P1
0.2
d d
0.1

0 Nominal
size
H1
H1

0 20 40 60 80 100 120 140 160 180 200 220 240 260

15A

0 30 60 90 120 150 180 210 240 270 300

20A
L L 0 50 100 150 200 250 300 350 400 450 500
25A

Flow rate kg/h

GD-45P GD-45
[Example]
When selecting the nominal size of a pressure reducing valve whose
inlet pressure (P1), reduced pressure (P2), and flow rate are 1.3 MPa,
0.6 MPa, and 200 kg/h, respectively, first find the intersection point of
the inlet pressure of 1.3 MPa and the reduced pressure of 0.6 MPa.
Trace down vertically from this intersection point to find the nominal size
with a flow rate of 200 kg/h or over. In this case, the nominal size is 20A.
･ Set the safety factor at 80 to 90%.

43 7-3, Futano-cho, Mizuho-ku, Nagoya, 467-0861, Japan Phone: 81-52-881-7199 Fax: 81-52-881-7201
www.yoshitake.jp

減圧-00
P044-045_減圧 2011.3.9 7:02 PM ページ 1

Ste
am
Direct type Diaphragm Ductile iron

P r e s s u r e R e d u c i n g V a l v e

GD-6N
Features
1. High accurate controllability of reduced pressure even at small flow rate.
2. Simple in structure, less prone to fail and easy to maintain.
3. Compact and lightweight.
4. Easy to install due to screwed connections.
5. Highly wear-resistance and durability of stainless steel made valve and
valve seat. A screen (60 mesh) is incorporated to protect the valve and
valve seat from dirt such as pipe scale and pipe chips.

Specifications
Model GD-6N
Application Steam
Inlet pressure 1.0 MPa or less
φE
(A) 0.02-0.1 MPa
Reduced pressure
(B) 0.1-0.4 MPa
Minimum differential pressure 0.05 MPa
Maximum pressure reduction ratio 10:1
Maximum temperature 220˚C
Valve seat leakage 0.1% or less of rated flow rate
Body Ductile cast iron
Material Valve, valve seat Stainless steel

H
Diaphragm Stainless steel
Connection JIS Rc screwed d
･ Available with stainless steel wetted parts and all stainless steel made.

H1
Dimensions (mm) and Weights (kg)
Nominal size d L H H1 E Weight
10A Rc 3/8 165 243 57 155 5.5 L
15A Rc 1/2 165 243 57 155 5.5
20A Rc 3/4 185 267 76 175 8.2
25A Rc 1 185 267 76 175 8.2 Flow Characteristic Chart
Set Shut-off pressure rise Offset pressure
Nominal Sizes Selection Chart (For Steam) pressure (within 0.02 MPa) (within 0.03 MPa)
Minimum adjustable
Reduced pressure

0.5 0.5

Pressure Reducing Valve

Rated flow rate
flow rate

0.6 0.7 0.8 0.9 1.0

Pa

0.4 0.5 0.4

M
P2: Reduced pressure MPa

P2: Reduced pressure MPa

re

0.4
su
es
pr

0.3 0.3
let

0 5 50 100%
: In

0.3
Flow rate
P1

0.2 0.2
0.2 Pressure Characteristic Chart
0.1 0.1 0.22
Reduced pressure MPa

0.1
0.20
0 0 0.18
0.16
Nominal size 0.14
3
W: Flow rate kg/h

W: Flow rate kg/h

10A 0
20 0.12
4
15A
5 0
30
6 0 0.2 0.4 0.6 0.8 1.0
0
40 Inlet pressure MPa
8 0
20A 50 This chart shows variation in reduced pressure
0
10 60
when the inlet pressure of 0.3 MPa is changed
0
25A 80 between 0.3 MPa and 1.0 MPa while the
reduced pressure is set at 0.2 MPa.
20
30 40 50 60 80 100 20
0
30
0
40
0
50
0
60
0 0 0
80 100
･ Set the safety factor at 80 to 90%.

7-3, Futano-cho, Mizuho-ku, Nagoya, 467-0861, Japan Phone: 81-52-881-7199 Fax: 81-52-881-7201 44
www.yoshitake.jp

減圧-26
 P044-045_減圧 2011.3.9 7:02 PM ページ 2

A i Wat
r er
Direct type Diaphragm Ductile iron

P r e s s u r e R e d u c i n g V a l v e

GD-200・200H・200C
Features
1. Pressure balance structure can keep the reduced pressure at a constant
level without being affected by inlet pressure.
2. Highly wear-resistance and durability of stainless steel made valve seat.
3. Maintenance and inspection can be conducted easily by disassembling
simply from the upper side.
4. A rubber disc prevents leakage when the valve is closed.
5. The GD-200C provides excellent corrosion resistance due to inner and
outer body surface coated with Nylon 11.

Specifications GD-200・200H

Model GD-200 GD-200C GD-200H

Cold and hot water, Oil (kerosene, heavy oils A and B), Air,
Application
Other non-dangerous fluids
Inlet pressure 1.0 MPa or less 2.0 MPa or less
15A-80A 15A-50A
(A) 0.05-0.25 MPa (B) 0.26-0.7 MPa (C) 0.5-1.0 MPa
(A) 0.05-0.25 MPa (B) 0.26-0.7 MPa 65A-80A
Reduced pressure (A) 0.05-0.25 MPa (B) 0.26-0.7 MPa (C) 0.5-0.9 MPa
100A-150A 100A-150A
(A) 0.05-0.25 MPa (B) 0.26-0.5 MPa (A) 0.05-0.25 MPa (B) 0.26-0.5 MPa (C) 0.5-0.75 MPa
Minimum differential pressure 0.05 MPa
Maximum pressure reduction ratio 10：1
Water: 5 L/min
Minimum adjustable flow rate
Air: 10 m3/h (standard condition)
Application temperature 5-80˚C 5-60˚C 5-80˚C
GD-200C
Fluid viscosity 600 cSt or less
Body Ductile cast iron
Valve seat Stainless steel
Material Valve disc NBR
Diaphragm NBR
Connection JIS 10K FF flanged JIS 20K RF flanged
15A-100A:
15A-100A: Electrodeposition coating
Electrodeposition coating Nylon 11

H
Inside surface treatment of body 125A-150A: (inside and outside 125A-150A:
Pressure Reducing Valve

Tar-based coating (black)

or electrodeposition coating surfaces of body) Tar-based coating (black)
or electrodeposition coating
･ Available with FKM type (except for the GD-200H (C) of 65A to 150A).
･ Available with pressure gauge.
H1

･ Available with the GD-200HS for flushing water.

L

Dimensions (mm) and Weights (kg) GD-200・200H

Nominal H H1 Weight
L
size GD-200･200H GD-200C GD-200･200H GD-200C GD-200･200H GD-200C
15A 145 310 296 57 8.2 8.3
20A 150 310 296 57 8.2 8.3
25A 150 333 318 67 10.0 10.1
32A 195 397 398 76 17.3 17.4
H

40A 195 397 398 76 17.3 17.4

50A 195 415 412 81 19.2 19.3
65A 270 555 573 110 113 40.0 40.1
80A 270 582 598 125 128 43.7 43.8
H1

100A 308 645 666 143 146 70.7 70.8

125A 380 (384) 849 875 179 182 144.0 (145.0) 144.1 L
150A 400 (404) 918 930 204 207 173.0 (175.0) 173.1 GD-200C
･ The above values in parentheses are the dimensions and weights of the GD-200H.

45 7-3, Futano-cho, Mizuho-ku, Nagoya, 467-0861, Japan Phone: 81-52-881-7199 Fax: 81-52-881-7201
www.yoshitake.jp

減圧-00
P046-047_減圧 2011.3.9 7:03 PM ページ 1

Wat A i
er r
Direct type Diaphragm Stainless steel

P r e s s u r e R e d u c i n g V a l v e

GD-20
Features
1. Pressure balance structure can keep the reduced pressure at a constant level without being affected
by inlet pressure.
2. Available with stainless steel wetted parts and all stainless steel made.
3. Valve disc prevents leakage when the valve is closed.

Specifications
Model Stainless steel wetted parts All stainless steel made
Cold and hot water, Oil (kerosene, heavy oils A and B), Air,
Application
Other non-dangerous fluids
Inlet pressure 1.0 MPa or less
15A-80A 15A-25A
(A) 0.05-0.25 MPa (B) 0.26-0.7 MPa (A) 0.05-0.2 MPa (B) 0.21-0.6 MPa
Reduced pressure 100A 32A-50A
(A) 0.05-0.25 MPa (B) 0.26-0.5 MPa (A) 0.05-0.2 MPa (B) 0.21-0.46 MPa

Minimum differential pressure 0.05 MPa

Maximum pressure reduction ratio 10:1
Application temperature 5-80˚C
Fluid viscosity 600 cSt or less
Body Cast Stainless steel
Valve seat Stainless steel
Material
Valve disc NBR
Diaphragm NBR
Connection JIS 10K FF flanged
･ Available with FKM.

Dimensions (mm) and Weights (kg)

Nominal H Weight
L Stainless steel All stainless steel H1 Stainless steel All stainless steel
size wetted parts made wetted parts made
15A 145 310 297 57 9.8 10.6

Pressure Reducing Valve

20A 150 310 297 57 9.8 10.6
25A 150 333 320 67 12.0 13.0
32A 195 397 397 76 20.7 22.5
H

40A 195 397 397 76 20.7 22.5

50A 195 415 415 81 23.0 25.0
65A 270 555 555 110 48.0 52.0
80A 270 582 582 125 52.4 56.8
100A 308 645 645 143 84.0 91.0
･ Please contact us about availability of 65A to 100A.
H1

7-3, Futano-cho, Mizuho-ku, Nagoya, 467-0861, Japan Phone: 81-52-881-7199 Fax: 81-52-881-7201 46
www.yoshitake.jp

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 P046-047_減圧 2011.3.9 7:03 PM ページ 2

GD-200 Series and GD-20

P r e s s u r e R e d u c i n g V a l v e

Nominal Sizes Selection Chart (For Water) Flow Characteristic Chart

Nominal size Shut-off pressure rise
Set (within 0.02 MPa)
200 150A
pressure Offset

Minimum adjustable
Reduced pressure
pressure *2
150 125A

flow rate *1

Rated flow rate

100
100A
80

60
80A
0 50 100 %
40 Flow rate
65A
*1 Minimum adjustable flow rate
30
For water: 5 L/min
V: Flow rate m3/h

50A
For air: 10 m3/h (standard condition)
20

15 40A *2 Offset pressure

Nominal size Pressure range Offset pressure
10 32A
(A), (B) Within 0.05 MPa
15-100A
8 (C) Within 0.11 MPa

6
25A (A) Within 0.05 MPa
125,150A (B) Within 0.07 MPa
(C) Within 0.11 MPa
4 20A

15A
2

1.5

0.05 0.1 0.2 0.4 0.6 0.8 1.0 2.0

∆P: Differential pressure MPa

Nominal Sizes Selection Chart (For Air) Pressure Characteristic Chart

Reduced pressure MPa

0.8 0.9 1.0 1.2 1.3 1.5 1.7 2.0 0.16

0.7 0.7
Pa

0.7
M

0.14
0.6 0.6
re
P2: Reduced pressure MPa

P2: Reduced pressure MPa

su

0.6
0.12
es
Pressure Reducing Valve

0.5 0.5
pr

0.5
let

0.10
: In

0.4 0.4
P1

0.4 0.08
0.3 0.3
0.3
0.2 0.2 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
0.2 Inlet pressure MPa
0.1 0.1 0.1 This chart shows variation in reduced pressure when the
inlet pressure of 1.0 MPa is changed between 0.15 MPa
400 and 1.0 MPa while the reduced pressure is set at
30
Nominal size 600 0.10 MPa.
40
Q: Flow rate m3/h (standard condition)

Q: Flow rate m3/h (standard condition)

15A 800
60 100
0
80 20A
100 25A 0
200
32A 00
30
200 0
40A 400
300 50A
00
60
400 0
65A 800
600 00
80A 100
800
0 00
100 100A 200
125A 00 00
3
0 00
200 150A 400
0
300
0
400
0 0 0 00 00 00
600 800 1000 200 300 400
･ Set the safety factor at 80 to 90%.

47 7-3, Futano-cho, Mizuho-ku, Nagoya, 467-0861, Japan Phone: 81-52-881-7199 Fax: 81-52-881-7201
www.yoshitake.jp

減圧-00
P048-049_減圧 2011.3.9 7:03 PM ページ 1

GD-200 Series and GD-20

P r e s s u r e R e d u c i n g V a l v e

GD-200･GD-200H･GD-20 Flow Rate Table for Liquid

(m3/h)
P1 (MPa) P2 (MPa) 15A 20A 25A 32A 40A 50A 65A 80A 100A 125A 150A
2.0 0.2-1.0 2.3 4.0 6.4 10.0 15.4 24.0 45.4 54.0 93.2 145.3 209.2
1.9 0.19-1.0 2.3 4.0 6.4 10.0 15.4 24.0 45.4 54.0 93.2 145.3 209.2
1.8 0.18-1.0 2.3 4.0 6.4 10.0 15.4 24.0 45.4 54.0 93.2 145.3 209.2
1.7 0.17-1.0 2.3 4.0 6.4 10.0 15.4 24.0 45.4 54.0 93.2 145.3 209.2
1.6 0.16-1.0 2.3 4.0 6.4 10.0 15.4 24.0 45.4 54.0 93.2 145.3 209.2
1.5 0.15-1.0 2.3 4.0 6.4 10.0 15.4 24.0 45.4 54.0 93.2 145.3 209.2
0.14-0.9 2.3 4.0 6.4 10.0 15.4 24.0 45.4 54.0 93.2 145.3 209.2
1.4
1 2.3 4.0 6.4 10.0 15.4 24.0 45.4 54.0 93.2 130.0 187.1
0.15-0.8 2.3 4.0 6.4 10.0 15.4 24.0 45.4 54.0 93.2 145.3 209.2
1.3 0.9 2.3 4.0 6.4 10.0 15.4 24.0 45.4 54.0 93.2 130.0 187.1
1 2.3 4.0 6.4 10.0 15.4 24.0 42.0 54.0 93.2 112.5 162.1
0.12-0.7 2.3 4.0 6.4 10.0 15.4 24.0 45.4 54.0 93.2 145.3 209.2
0.8 2.3 4.0 6.4 10.0 15.4 24.0 45.4 54.0 93.2 130.0 187.1
1.2
0.9 2.3 4.0 6.4 10.0 15.4 24.0 42.0 54.0 93.2 112.5 162.1
1 2.3 4.0 6.1 9.8 14.7 19.6 34.3 44.1 83.3 91.9 132.3
0.11-0.6 2.3 4.0 6.4 10.0 15.4 24.0 45.4 54.0 93.2 145.3 209.2
0.7 2.3 4.0 6.4 10.0 15.4 24.0 45.4 54.0 93.2 130.0 187.1
1.1 0.8 2.3 4.0 6.4 10.0 15.4 24.0 42.0 54.0 93.2 112.5 162.1
0.9 2.3 4.0 6.1 9.8 14.7 19.6 34.3 44.1 83.3 91.9 132.3
1 2.2 3.5 4.3 6.9 10.4 13.9 24.3 31.2 58.9 65.0 93.6
0.1-0.5 2.3 4.0 6.4 10.0 15.4 24.0 45.4 54.0 93.2 145.3 209.2
0.6 2.3 4.0 6.4 10.0 15.4 24.0 45.4 54.0 93.2 130.0 187.1
1 0.7 2.3 4.0 6.4 10.0 15.4 24.0 42.0 54.0 93.2 112.5 162.1
0.8 2.3 4.0 6.1 9.8 14.7 19.6 34.3 44.1 83.3 91.9 132.3
0.9 2.2 3.5 4.3 6.9 10.4 13.9 24.3 31.2 58.9 65.0 93.6
0.09-0.4 2.3 4.0 6.4 10.0 15.4 24.0 45.4 54.0 93.2 145.3 209.2
0.5 2.3 4.0 6.4 10.0 15.4 24.0 45.4 54.0 93.2 130.0 187.1
0.9 0.6 2.3 4.0 6.4 10.0 15.4 24.0 42.0 54.0 93.2 112.5 162.1
0.7 2.3 4.0 6.1 9.8 14.7 19.6 34.3 44.1 83.3 91.9 132.3
0.8 2.2 3.5 4.3 6.9 10.4 13.9 24.3 31.2 58.9 65.0 93.6
0.08-0.3 2.3 4.0 6.4 10.0 15.4 24.0 45.4 54.0 93.2 145.3 209.2
0.4 2.3 4.0 6.4 10.0 15.4 24.0 45.4 54.0 93.2 130.0 187.1
0.8 0.5 2.3 4.0 6.4 10.0 15.4 24.0 42.0 54.0 93.2 112.5 162.1

Pressure Reducing Valve

0.6 2.3 4.0 6.1 9.8 14.7 19.6 34.3 44.1 83.3 91.9 132.3
0.7 2.2 3.5 4.3 6.9 10.4 13.9 24.3 31.2 58.9 65.0 93.6
0.07-0.2 2.3 4.0 6.4 10.0 15.4 24.0 45.4 54.0 93.2 145.3 209.2
0.3 2.3 4.0 6.4 10.0 15.4 24.0 45.4 54.0 93.2 130.0 187.1
0.7 0.4 2.3 4.0 6.4 10.0 15.4 24.0 42.0 54.0 93.2 112.5 162.1
0.5 2.3 4.0 6.1 9.8 14.7 19.6 34.3 44.1 83.3 91.9 132.3
0.6 2.2 3.5 4.3 6.9 10.4 13.9 24.3 31.2 58.9 65.0 93.6
0.1 2.3 4.0 6.4 10.0 15.4 24.0 45.4 54.0 93.2 145.3 209.2
0.2 2.3 4.0 6.4 10.0 15.4 24.0 45.4 54.0 93.2 130.0 187.1
0.6 0.3 2.3 4.0 6.4 10.0 15.4 24.0 42.0 54.0 93.2 112.5 162.1
0.4 2.3 4.0 6.1 9.8 14.7 19.6 34.3 44.1 83.3 91.9 132.3
0.5 2.2 3.5 4.3 6.9 10.4 13.9 24.3 31.2 58.9 65.0 93.6
0.1 2.3 4.0 6.4 10.0 15.4 24.0 45.4 54.0 93.2 130.0 187.1
0.2 2.3 4.0 6.4 10.0 15.4 24.0 42.0 54.0 93.2 112.5 162.1
0.5
0.3 2.3 4.0 6.1 9.8 14.7 19.6 34.3 44.1 83.3 91.9 132.3
0.4 2.2 3.5 4.3 6.9 10.4 13.9 24.3 31.2 58.9 65.0 93.6
0.1 2.3 4.0 6.4 10.0 15.4 24.0 42.0 54.0 93.2 112.5 162.1
0.4 0.2 2.3 4.0 6.1 9.8 14.7 19.6 34.3 44.1 83.3 91.9 132.3
0.3 2.2 3.5 4.3 6.9 10.4 13.9 24.3 31.2 58.9 65.0 93.6
0.1 2.3 4.0 6.1 9.8 14.7 19.6 34.3 44.1 83.3 91.9 132.3
0.3
0.2 2.2 3.5 4.3 6.9 10.4 13.9 24.3 31.2 58.9 65.0 93.6
0.2 0.1 2.2 3.5 4.3 6.9 10.4 13.9 24.3 31.2 58.9 65.0 93.6
0.1 0.05 1.5 2.5 3.1 4.9 7.4 9.8 17.2 22.1 41.7 45.9 66.2

7-3, Futano-cho, Mizuho-ku, Nagoya, 467-0861, Japan Phone: 81-52-881-7199 Fax: 81-52-881-7201 48
www.yoshitake.jp

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 P048-049_減圧 2011.3.9 7:03 PM ページ 2

GD-200 Series and GD-20

P r e s s u r e R e d u c i n g V a l v e

Features of Nylon 11 used for GD-200 Series

○ Water absorption is low, and wear resistance is excellent.
○ Nylon 11 is applicable to food-related equipment because it is nontoxic (it is accepted by FDA).
○ Seawater resistance and critical atmosphere resistance are very good.
○ Outdoor weather resistance is outstanding.
○ Chemical resistance is great.
○ Heat resistance and hot water resistance are fine.
○ Electric insulation and sound damping performance are superb.
●Characteristic comparison of powder coating film
Coating Nylon 11 Epoxy Acrylic Polyester Polyethylene PVC (Polyvinyl chloride)
Characteristics
Specific gravity 1.04-1.1 1.3-1.6 1.3-1.6 1.3-1.6 1.0 1.3
Hardness (Pencil hardness) F 2H H H HB B
Maximum working temperature (˚C) 100-130 100-150 100-120 100-170 70-80 70-80
Wear resistance ◎ ⃝ △ △ △ △
Impact resistance ◎ ⃝ △ △ △ ◎
Adhesion ◎ ⃝ ⃝ ⃝ △ △
Low-temperature characteristics ◎ー50˚C ⃝ ⃝ ⃝ ⃝ ×
Weather resistance ⃝ × ◎ ⃝ △ ⃝
Alkali resistance ◎ ⃝ ⃝ △ ⃝ ⃝
Acid resistance △ ⃝ ⃝ ⃝ ◎ ◎
Solvent resistance ◎ ◎ × ◎ △ ×
Salt water resistance ◎ ⃝ △ ⃝ ⃝ ⃝
[Meanings of symbols] ◎: excellent, ○: good, △: care required in use, ×: unacceptable
･ Note that the table above shows the features of Nylon 11 and does not describe the working conditions of the GD-200 Series.

Features of Nylon 11
Item Measured value
Melting point 184-186˚C
Specific gravity (20˚C) 1.04
Coefficient of friction 0.18
*Tensile strength (ASTM D 638) 40-48 MPa
*Elongation (within Elastic limit)(ASTM D 638) 18-34%
Hardness (shore D, Film thickness 5 mm, 20˚C) 75
*Impact resistance test〈50 cm height falling of hemishperical weight (φ 25 mm x 2 kg)〉 No peeling
*Bending test〈JIS K 5400 (180 degree twist around φ 10 mm rod)〉 No crack, No peeling
*Wear resistance test〈Wear amount after 1000 revolutions of Taber tester (CS-17 griding wheel,1 kg load)〉 5-8 mg
*Erichsen test (JIS Z 2247 B) 10 mm, No crack
Thermal conductivity (under the condition of 50-170˚C） 29.4 x 10-4 J/g/℃
Coefficient of linear expansion (under the condition of –20 – 100˚C） 15 x 10-5
Specific heat 2.1 J/g/℃
Pressure Reducing Valve

Volume resistivity〈ASTM D 257 (20˚C, 65%RH, 500 V)〉 3.5 x 1014 Ω/cm2/cm
Salt spray test (ASTM D 117) Not particular for 2 thousands hour

*Water Under the conditions of 20˚C and 100%RH 1.6-2.6%

absorption immersed in boiling water, 100˚C 2.4-3%
5% NaCl  70˚C x 3 days 1.8volume%, 2.6weight%
*Immersion 10% NaOH  70˚C x 3 days 4.1volume%, 4.9weight%
test Gasoline  Room temperature x 30 days 1.5volume%, 1.7weight%
Insulating oil Room temperature x 30 days 2.5volume%, 1.9weight%
(Note) The asterisk (*) mark indicates a measured value obtained from a test piece coated to a film thickness of 300μm by fluidization dip
coating, and the above information in parentheses is a test method.

49 7-3, Futano-cho, Mizuho-ku, Nagoya, 467-0861, Japan Phone: 81-52-881-7199 Fax: 81-52-881-7201
www.yoshitake.jp

減圧-00
P050-051_減圧 2011.3.9 7:04 PM ページ 1

Wat
er
Direct type Diaphragm Bronze

P r e s s u r e R e d u c i n g V a l v e

GD-24・24B
Features
1. Direct acting and hanging type, no sliding parts. Free of
performance deterioration caused by wear of sliding parts
and great durability.
2. Wetted parts are made of corrosion-resistant material to
prevent rusty water.
3. Highly wear-resistance and durability of stainless steel made
valve seat.
4. Closed structure keeps fluid inside even if the diaphragm is
damaged or broken.
5. Horizontal or vertical piping is possible.

GD-24 GD-24B
Specifications
Model GD-24 GD-24B
Application Cold and hot water Cold and hot water, Flushing water
Inlet pressure 0.2-1.6 MPa ･ If a large capacity is required, valves can be
Reduced pressure 0.05-0.55 MPa installed in parallel.
Minimum differential pressure 0.05 MPa 50A
Maximum pressure reduction ratio 10:1
Application temperature 5-80˚C * 80A 80A

Body Cast bronze 50A

Valve Brass Bronze

Valve disc Urethane rubber 40A x 2 Valves = 65A
Material Valve seat Stainless steel 50A x 2 Valves = 80A
50A x 3 Valves = 100A
Diaphragm NBR
Cap Brass Bronze
Plug Stainless steel
Connection JIS Rc screwed
* Avoid use at temperature of 70˚C or more.

Pressure Reducing Valve

Dimensions (mm) and Weights (kg)
Nominal size d L H H1 Weight
15A Rc 1/2 80 193 42 1.8
20A Rc 3/4 90 210 45 2.4
25A Rc 1 100 230 50 3.3
H

32A Rc 1-1/4 120 265 60 4.7

40A Rc 1-1/2 150 315 62 8.2
50A Rc 2 185 365 73 14.3
H1

L d

7-3, Futano-cho, Mizuho-ku, Nagoya, 467-0861, Japan Phone: 81-52-881-7199 Fax: 81-52-881-7201 50
www.yoshitake.jp

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 P050-051_減圧 2011.3.9 7:04 PM ページ 2

GD-24・24B
P r e s s u r e R e d u c i n g V a l v e

Nominal Sizes Selection Chart (For Water) Flow Characteristic Chart

30 Shut-off pressure rise Offset pressure
(within 0.03 MPa) (within 0.05 MPa)
Set
Nominal size pressure
50A

Minimum adjustable
Reduced pressure
20

Rated flow rate

15

flow rate
40A

10
32A
8
V: Flow rate m3/h

6
25A 0 5 50 100 %
5
4
Flow rate
20A
3

15A
Pressure Characteristic Chart
2

Reduced pressure MPa

1.5 0.3

1 0.2

0.1

0.5
0.2 0.4 0.6 0.8 1 1.2 1.4 1.6
Inlet pressure MPa
0.05 0.1 0.15 0.2 0.3 0.5 0.6 0.8 1.0 1.5 2.0 This chart shows variation in reduced pressure when the
∆P: Differential pressure MPa inlet pressure of 0.6 MPa is changed between 0.2 MPa
and 1.6 MPa while the reduced pressure is set at
0.2 MPa.
Pressure Reducing Valve

51 7-3, Futano-cho, Mizuho-ku, Nagoya, 467-0861, Japan Phone: 81-52-881-7199 Fax: 81-52-881-7201
www.yoshitake.jp

減圧-00
P052-053_減圧 2011.3.9 7:05 PM ページ 1

Wat
er
Direct type Diaphragm Bronze

P r e s s u r e R e d u c i n g V a l v e

GD-26-N Series

GD-26-N・28-N GD-27-N・29-N

Features
1. Wetted parts are made of corrosion-resistant material to prevent rusty water.
2. Reduced noise.
3. Pressure balance structure can keep the reduced pressure at a constant level without being affected
by inlet pressure.
4. Closed structure keeps fluid inside even if the diaphragm is damaged or broken.
5. Maintenance and inspection can be conducted easily by disassembling the upper side only.
6. Compact and lightweight design makes piping works easy.

Specifications
Model GD-26-N GD-27-N GD-28-N GD-29-N
Application Cold and hot water
Inlet pressure 1.0 MPa or less 1.6 MPa or less
25A-100A
(A) 0.05-0.35 MPa (A) 0.05-0.35 MPa (B) 0.3-0.7 MPa (A) 0.05-0.35 MPa
Reduced pressure

Pressure Reducing Valve

(B) 0.3-0.7 MPa 125A-150A (B) 0.3-0.7 MPa
(A) 0.05-0.2 MPa (B) 0.2-0.5 MPa
Minimum differential pressure 0.05 MPa
Maximum pressure reduction ratio 10:1
25A-100A 5-90˚C
Application temperature 5-90˚C 5-90˚C
125A-150A 5-80˚C *
Body Cast bronze (NPb-treated)
Valve seat Cast bronze (NPb-treated)
25A-100A EPDM
Material Valve disc EPDM EPDM
125A-150A NBR
25A-100A EPDM
Diaphragm EPDM EPDM
125A-150A NBR
Connection JIS Rc screwed JIS 10K FF flanged JIS Rc screwed JIS 16K FF flanged
* Available with the GD-27F withstanding 90˚C, of 125A and 150A.
･ A strainer (40 mesh) is incorporated in 15A to 50A.
･ Pressure gauge connection port is JIS Rc 1/8 (for 40φ, 1.0 MPa).
･ Available with pipe end core (GD-26L-N, maximum temperature: 40˚C)
･ Avoid use of 125A and 150A under differential pressure of more than 0.8 MPa.

7-3, Futano-cho, Mizuho-ku, Nagoya, 467-0861, Japan Phone: 81-52-881-7199 Fax: 81-52-881-7201 52
www.yoshitake.jp

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 P052-053_減圧 2011.3.9 7:05 PM ページ 2

GD-26-N Series
P r e s s u r e R e d u c i n g V a l v e

Dimensions (mm) and Weights (kg)

●GD-26-N and GD-28-N
Nominal size d L H H1 Weight
15A Rc 1/2 115 159.5 37.5 1.6
20A Rc 3/4 120 159.5 38.5 1.7
25A Rc 1 135 170 41 2.1
32A Rc 1-1/4 180 224 57 4.0
40A Rc 1-1/2 180 224 57 4.4
50A Rc 2 200 239.5 61 6.5

H
d

H1
L

GD-26-N
GD-28-N

●GD-27-N and GD-29-N

Nominal size L H H1 Weight
25A 160 170 41 5.1
32A 200 224 57 7.5
40A 200 224 57 7.7
50A 220 239.5 61 10.9
65A 220 329 77 20.0
80A 230 (234) 345 82 22.0 (24.0)
100A 270 (278) 412 94 33.0 (36.5)
125A 360 771 148 90.0
Pressure Reducing Valve

150A 380 771 148 97.0

･ The above values in parentheses are the dimension and weights of the GD-29-N.
･ The above values of 125A and 150A are only for the GD-27-N.
H

H
H1

H1

H1

L L L

GD-27-N GD-27-N GD-27-N

GD-29-N GD-29-N 125A-150A
25A-50A 65A-100A

53 7-3, Futano-cho, Mizuho-ku, Nagoya, 467-0861, Japan Phone: 81-52-881-7199 Fax: 81-52-881-7201
www.yoshitake.jp

減圧-00
P054-055_減圧 2011.3.9 7:05 PM ページ 1

Wat
er
Direct type Diaphragm Stainless steel

P r e s s u r e R e d u c i n g V a l v e

GD-26S Series
Features
1. Wetted parts are made of corrosion-resistant material to
prevent rusty water.
2. Reduced noise.
3. Pressure balance structure can keep the reduced pressure at
a constant level without being affected by inlet pressure.
4. Closed structure keeps fluid inside even if the diaphragm is GD-26S・28S
damaged or broken.
5. Maintenance and inspection can be conducted easily by
disassembling simply from the upper side.
6. Compact and lightweight design makes piping works easy.

GD-27S・29S

Specifications
Model GD-26S GD-27S GD-28S GD-29S
Application Cold and hot water
Inlet pressure 1.0 MPa or less 1.6 MPa or less
(A) 0.05-0.35 MPa
Reduced pressure
(B) 0.3-0.7 MPa
Minimum differential pressure 0.05 MPa
Maximum pressure reduction ratio 10:1
Application temperature 5-90˚C
Body Cast stainless steel
Valve seat Cast stainless steel
Material
Valve disc EPDM
Diaphragm EPDM
Connection JIS Rc screwed JIS 10K FF flanged JIS Rc screwed JIS 16K FF flanged
･ A strainer (40 mesh) is incorporated in 15A to 50A.
･ Pressure gauge connection port is JIS Rc 1/4.
･ Available with FKM.

Pressure Reducing Valve

Dimensions (mm) and Weights (kg)
●GD-26S and GD-28S
Nominal size d L H H1 Weight
H

20A Rc 3/4 135 170 41 2.2 d

25A Rc 1 135 170 41 2.2
32A Rc 1-1/4 180 224 57 4.7
H1

40A Rc 1-1/2 180 224 57 4.5

L
50A Rc 2 200 239.5 61 6.5
GD-26S・GD-28S
●GD-27S and GD-29S
Nominal size L H H1 Weight
20A 160 170 41 3.9
25A 160 170 41 4.8
32A 200 224 57 8.0
40A 200 224 57 8.3
H

50A 220 239.5 61 10.8

65A 220 329 77 20.6
H1

80A 230 (234) 345 82 22.0 (25.0)

H1

100A 270 (278) 412 94 34.5 (36.5)

L
･ The values in parentheses are the dimensions and weights of the L

GD-29S.
GD-27S・GD-29S GD-27S・GD-29S
25A-50A 65A-100A

7-3, Futano-cho, Mizuho-ku, Nagoya, 467-0861, Japan Phone: 81-52-881-7199 Fax: 81-52-881-7201 54
www.yoshitake.jp

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 P054-055_減圧 2011.3.9 7:05 PM ページ 2

GD-26-N Series
P r e s s u r e R e d u c i n g V a l v e

Rated Flow Rate

●For water 〔The differential pressure before and after the valve is 0.15 MPa or more.〕
Nominal size 15A 20A 25A 32A 40A 50A 65A 80A 100A 125A 150A
Rated flow rate L/min 30 40 60 100 150 250 300 450 700 1,600 1,800
･ If the differential pressure before and after the valve is less than 0.15 MPa, select a proper nominal size from the appropriate chart shown
below.

Flow Rate Chart

●Nominal size: 15A to 50A ●Nominal size: 65A to 100A
0.7 0.7

0.6 0.6

0.5 0.5

P6: Reduced pressure MPa

P2: Reduced pressure MPa

0.4 0.4

0.3 0.3

0.2 0.2

0.1 0.1

0 0
Nominal 15A Nominal 65A
size 0 10 20 30 size 0 50 100 150 200 250 300
20A 80A
0 10 20 30 40 0 50 100 150 200 250 300 350 400 450
25A 100A
0 10 20 30 40 50 60 0 100 200 300 400 500 600 700
32A V: Flow rate L/min
0 20 40 60 80 100
40A
0 50 100 150
Inlet pressure 1.0 to 1.6 MPa
50A
0 50 100 150 200 250 Reduced pressure + 0.2 MPa
V: Flow rate L/min Reduced pressure + 0.1 MPa
Pressure Reducing Valve

Reduced pressure + 0.05 MPa

●Nominal size: 125A to 150A
0.5

0.4
P2: Reduced pressure MPa

0.3

0.2

0.1

0.05

Nominal 125A
size 0 400 800 1200 1600
150A
0 300 600 900 1200 1500 1800
V: Flow rate L/min

55 7-3, Futano-cho, Mizuho-ku, Nagoya, 467-0861, Japan Phone: 81-52-881-7199 Fax: 81-52-881-7201
www.yoshitake.jp

減圧-00
P056_減圧 2011.3.9 7:29 PM ページ 1

GD-26-N Series
P r e s s u r e R e d u c i n g V a l v e

Noise Characteristic Chart Pressure Characteristic Chart

Nominal size: 15A to 25A 15A

Reduced pressure MPa

Inlet pressure: 0.6 MPa 20A 0.12
Reduced pressure: 0.2 MPa 25A
0.11
70
0.10
60
0.09
Noise dB [A]

50 0.08

40 0 0.2 0.4 0.6 0.8 1.0

Inlet pressure MPa
30
This chart shows variation in reduced pressure when the inlet
pressure of 0.6 MPa is changed between 0.15 MPa and 1.0 MPa
while the reduced pressure is set at 0.1 MPa.
0 10 20 30 40 50 60
Flow rate L/min

Nominal size: 32A to 50A 32A Flow Characteristic Chart

Inlet pressure: 0.6 MPa 40A
Reduced pressure: 0.2 MPa 50A
Shut-off
80 Set pressure rise (within 0.02 MPa)
pressure * Offset

Minimum adjustable
70 Reduced pressure pressure

Rated flow rate

Noise dB [A]

flow rate
60

50

40

30 0 5 50 100 ％
Flow rate

* Offset pressure
0 50 100 150 200 250
Flow rate L/min Nominal size Pressure range Reduced pressure range Offset pressure
A 0.05-0.35 MPa Within 0.05 MPa
15-100A
B 0.3-0.7 MPa Within 0.10 MPa
Nominal size: 65A to 100A 65A A 0.05-0.20 MPa Within 0.07 MPa
Inlet pressure: 0.6 MPa 80A 125,150A
B 0.2-0.5 MPa Within 0.12 MPa
Reduced pressure: 0.2 MPa 100A
90

Pressure Reducing Valve

80
70
Noise dB [A]

60
50
40
30

0 100 200 300 400 500 600 700

Flow rate L/min

7-3, Futano-cho, Mizuho-ku, Nagoya, 467-0861, Japan Phone: 81-52-881-7199 Fax: 81-52-881-7201 56
www.yoshitake.jp

減圧-38
 P057_減圧 2011.3.9 7:30 PM ページ 1

Wat
er
Direct type Diaphragm Bronze

P r e s s u r e R e d u c i n g V a l v e

GD-46 Series
The GD-46 Series water pressure reducing valve enables to shorten a construction work period since
water pressure inspection can be performed easily by turning the cap upside down with the valve
installed.

Features
1. Reduced noise. Can be used even late at night.
2. Water pressure inspection can be performed easily by turning
the cap upside down with the valve installed.
3. Pressure balance structure can keep the reduced pressure at
a constant level without being affected by inlet pressure.
4. Attached pressure gauge joint allows a pressure gauge to be
installed while water is supplied so that the set pressure can GD-46PP
be checked easily.
5. Noise characteristics and flow characteristics conform to the
''Quality Criterion on Materials'' of Urban Renaissance
Agency in Japan.

GD-46LL･GD-46KK

Specifications
Nominal size 20A
Application City water
Inlet pressure 1.0 MPa or less
(A) 0.05-0.10 MPa〔Standard setting: 0.09 MPa〕
Reduced pressure (B) 0.10-0.22 MPa〔Standard setting: 0.20 MPa〕
(C) 0.20-0.30 MPa〔Standard setting: 0.25 MPa〕
Minimum differential pressure 0.02 MPa
Pressure Reducing Valve

Maximum pressure reduction ratio 10：1

Without pipe end core 5-90˚C
Working
Equipped with pipe end core 5-40˚C
temperature
Equipped with check valve 5-60˚C
Minimum adjustable flow rate 0.5 L/min
Rated Without check valve 50 L/min (Differential pressure before and after valve: 0.10 MPa or more)
flow rate Equipped with check valve 30 L/min (Differential pressure before and after valve: 0.10 MPa or more)
Body Cast bronze (NPb-treated)
Spindle Dezincification resistant material
Material
Valve disc FKM
Diaphragm FKM
Pressure check function Pressure gauge joint (JIS Rc 1/8 screwed)
Outlet withstand pressure 0.36 MPa (at pressure reducing valve function)
･ Available with pressure gauge (type A or type D) as an optional extra (for 0.5 MPa).
･ The accuracy of a pressure gauge is ±3% F.S.
･ The strainer is 60 mesh.
･ The product is set to the pressure reducing valve function when it is delivered from our plant.
･ An incombustible material is used for heat insulating material.

57 7-3, Futano-cho, Mizuho-ku, Nagoya, 467-0861, Japan Phone: 81-52-881-7199 Fax: 81-52-881-7201
www.yoshitake.jp

減圧-39
P058-059_減圧 2011.3.9 7:31 PM ページ 1

GD-46 Series
P r e s s u r e R e d u c i n g V a l v e

Dimensions (mm) and Weights (kg)

Connection
Model L Weight
Inlet x outlet
GD-46 G1xG1 − 1.0
GD-46PP・46PPC R 3/4 x R 3/4 218 1.4
GD-46KK・46KKC・46LL・46LLC Rc 3/4 x Rc 3/4 214 1.5
GD-46PK・46PKC・46PL・46PLC R 3/4 x Rc 3/4 216 1.4
GD-46KP・46KPC・46LP・46LPC Rc 3/4 x R 3/4 216 1.4
GD-46PG R 3/4 x G 1-3/4 165 1.2
GD-46GP・46GPC G 1 x R 3/4 165 1.2
GD-46KG・46LG Rc 3/4 x G 1 163 1.2
GD-46GK・46GKC・46GL・46GLC G 1 x Rc 3/4 163 1.2
GD-46SG Rc 3/4 x G 1 194.5 1.4
GD-46SP・46SPC Rc 3/4 x R 3/4 247.5 1.6
GD-46SL・46SLC・46SK・46SKC Rc 3/4 x Rc 3/4 245.5 1.6

〔GD-46PP〕 〔GD-46SP Equipped with stop valve〕

73

φ 89.6
φ 89.6

122.5
91

31.5
31.5

L L

Dimensions of the Heat Insulating Material

73

Heat insulating Heat insulating

material material
147

147
37.5
40

37.5
40

72 55

Pressure Reducing Valve

147.5 116.5
72 55
147.5 116.5

GD-46SP GD-46PP
Note) The heat insulating material is common to all GD-46 Series valves. However, no heat insulating material is used for the water stop valve.

Dimensions of the Valve Equipped with the Optional Pressure Gauge

Type A Type D
Pressure gauge Pressure gauge

φ 43
φ 43
29

29

97.5 25.5
81

Equipped with the pressure gauge Type A Equipped with the pressure gauge Type D

7-3, Futano-cho, Mizuho-ku, Nagoya, 467-0861, Japan Phone: 81-52-881-7199 Fax: 81-52-881-7201 58
www.yoshitake.jp

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 P058-059_減圧 2011.3.9 7:31 PM ページ 2

GD-46 Series
P r e s s u r e R e d u c i n g V a l v e

Flow Characteristic Chart Noise Characteristic Chart

0.30 Inlet pressure: 1.0 MPa 55

0.25
Outlet pressure MPa

50
Inlet pressure: 0.5 MPa

Noise dB (A)
0.20 45
Inlet pressure: 0.3 MPa
0.15
40

0.10
35

0.05
30
0
0 10 20 30 40 50
Without check valve
0 10 20 30 40 50 Flow rate L/min
Equipped with 〈Test conditions〉
0 10 20 30
check valve ･ Inlet pressure: 0.6 MPa
Flow rate L/min
･ Reduced pressure: 0.2 MPa
Pressure Characteristic Chart ･ Distance from the sample valve to the microphone: 15 cm
･ Background noise: 30 dB (A)
0.23
(Except for the valve equipped with a check valve)
0.22
Outlet pressure MPa

0.21

0.20

0.19

0.18

0
0.2 0.4 0.6 0.8 1.0
Inlet pressure MPa

This chart shows variation in reduced pressure when the inlet

pressure of 0.5 MPa is changed between 0.22 MPa and 1.0 MPa
while the reduced pressure is set at 0.2 MPa.

How to Adjust the Pressure

Flat face
Pressure Reducing Valve

Screwdriver

Cap To increase To decrease

R 1/8 Adjusting screw Cap nut

Pressure
Pressure gauge joint
gauge

cover

Fig. 1 Fig. 2

1. Screw the pressure gauge into the pressure gauge joint (Fig. 1).
2. Remove the cap. Checking the pressure gauge, turn the adjusting screw to adjust the reduced pressure to a desired level (Fig. 2).
・The reduced pressure increases when the adjusting screw is turned clockwise.
・The reduced pressure decreases when the adjusting screw is turned counterclockwise.
Note) Use a keystone tip screwdriver of 4.5 to 6 mm in nominal width for slotted head screws.
Set the screwdriver in the slot of the adjusting screw avoiding the cap nut attached in the center of the screw, and adjust the reduced
pressure.
If pressure adjustment is difficult to make, please contact us.
3. After reduced pressure adjustment, attach the cap with the flat face up.
4. Remove the pressure gauge.

59 7-3, Futano-cho, Mizuho-ku, Nagoya, 467-0861, Japan Phone: 81-52-881-7199 Fax: 81-52-881-7201
www.yoshitake.jp

減圧-00
P060-061_減圧 2011.3.9 7:32 PM ページ 1

Wat
er
Direct type Diaphragm Bronze

P r e s s u r e R e d u c i n g V a l v e

GD-38 Series
The GD-38 Series is a bypass equipped water pressure
reducing valve for individual water supply to complex housing,
and does not require substitute piping.
Water washing of piping and water pressure inspection can be
performed by turning the spring case with the reducing valve
installed. For labor saving and resource saving, no accessory
GD-38PP・GD-38VV
parts required.

Features
1. Reduced noise. Can be used even late at night.
2. Pressure balance structure can keep the reduced pressure at
a constant level without being affected by inlet pressure.
3. Bypass function allows water pressure inspection to be
performed easily with the valve installed to significantly
GD-38LL
shorten a construction work period.
4. Cartridge system is used for the pressure reducing function,
making maintenance and inspection easy.
5. Closed structure keeps fluid from flowing to outside even if
the diaphragm is damaged or broken.
6. Attached pressure gauge joint allows a pressure gauge to be
installed while water is supplied so that the set pressure can
be checked easily.

GD-38SP

Specifications
Nominal size 20A

Pressure Reducing Valve

Application City water
Inlet pressure 1.0 MPa or less
(A) 0.05-0.10 MPa〔Standard setting: 0.09 MPa〕
Reduced pressure (B) 0.10-0.22 MPa〔Standard setting: 0.20 MPa〕
(C) 0.20-0.30 MPa〔Standard setting: 0.25 MPa〕
Minimum differential pressure 0.05 MPa
Maximum pressure reduction ratio 10：1
Without pipe end core 5-90˚C
Working
Equipped with pipe end core 5-40˚C
temperature
Equipped with check valve 5-60˚C
Minimum adjustable flow rate 0.5 L/min
Rated Without check valve 70 L/min (Differential pressure before and after valve: 0.10 MPa or more)
flow rate Equipped with check valve 30 L/min (Differential pressure before and after valve: 0.10 MPa or more)
Body Cast bronze (NPb-treated)
Valve seat Cast bronze (NPb-treated)
Material Spindle Brass
Valve disc EPDM
Diaphragm EPDM
Pressure check function Pressure gauge joint (JIS Rc 1/8 screwed)
Outlet withstand pressure 0.36 MPa (at pressure reducing valve function)
･ Available with pressure gauge (type A or type D) as an optional extra (for 0.5 MPa).
･ The strainer is 60 mesh.
･ The accuracy of a pressure gauge is ±3% F.S.
･ The product is set to the ''bypass'' position when it is delivered from our plant.
･ An incombustible material is used for heat insulating material.

7-3, Futano-cho, Mizuho-ku, Nagoya, 467-0861, Japan Phone: 81-52-881-7199 Fax: 81-52-881-7201 60
www.yoshitake.jp

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 P060-061_減圧 2011.3.9 7:32 PM ページ 2

GD-38 Series
P r e s s u r e R e d u c i n g V a l v e

Dimensions (mm) and Weights (kg)

Connection
Model L Weight
Inlet x outlet
〔GD-38 Series〕
GD-38 G1xG1 − 1.4
GD-38VV・38VVC・38PP・38PPC R 3/4 x R 3/4 218 1.8
GD-38KK・38KKC・38LL・38LLC Rc 3/4 x Rc 3/4 214 1.9 φ 88
GD-38VK・38VKC・38VL・38VLC R 3/4 x Rc 3/4 216 1.8

146
GD-38PK・38PKC・38PL・38PLC R 3/4 x Rc 3/4 216 1.8
GD-38KV・38KVC・38LV・38LVC Rc 3/4 x R 3/4 216 1.8
GD-38KP・38KPC・38LP・38LPC Rc 3/4 x R 3/4 216 1.8

35.5
GD-38VG・38PG R 3/4 x G 1 165 1.6
GD-38GV・38GVC・38GP・38GPC G 1 x R 3/4 165 1.6
GD-38KG・38LG Rc 3/4 x G 1 163 1.6 L

GD-38GK・38GKC・38GL・38GLC G 1 x Rc 3/4 163 1.6

GD-38SG Rc 3/4 x G 1 193.5 1.8
GD-38SP・38SPC・38SV・38SVC Rc 3/4 x R 3/4 246.5 2.0
GD-38SL・38SLC・38SK・38SKC Rc 3/4 x Rc 3/4 244.5 2.0

Dimensions of the Heat Insulating Material

168 128

84 65
165
44

38
Pressure Reducing Valve

Dimensions of the Valve Equipped with the Optional Pressure Gauge

φ 43
φ 43

30

105 89

Equipped with the pressure gauge Type A Equipped with the pressure gauge Type D

61 7-3, Futano-cho, Mizuho-ku, Nagoya, 467-0861, Japan Phone: 81-52-881-7199 Fax: 81-52-881-7201
www.yoshitake.jp

減圧-00
P062-063_減圧 2011.3.9 7:33 PM ページ 1

GD-38 Series
P r e s s u r e R e d u c i n g V a l v e

Flow Characteristic Chart Noise Characteristic Chart

0.30 55
Inlet pressure: 1.0 MPa
50

Noise dB (A)
0.25
Reduced pressure MPa

Inlet pressure: 0.5 MPa

45
0.20
Inlet pressure: 0.3 MPa 40

0.15 35

0.10 30

0 10 20 30 40 50 55 60 70
0.05
Flow rate L/min
･ Inlet pressure: 0.6 MPa
Without check valve ･ Reduced pressure: 0.2 MPa
0 10 20 30 40 50 60 70 ･ Distance from the sample valve to the microphone: 15 cm
Equipped with check valve
0 10 20 30 ･ Background noise: 30 dB (A)
Flow rate L/min

Pressure Characteristic Chart

0.23 ･ This chart shows variation in reduced pressure when the inlet pressure of 0.5 MPa is
Reduced pressure MPa

0.22 changed between 0.25 MPa and 1.0 MPa while the reduced pressure is set at
0.2 MPa.
0.21
0.20
0.19
0.18

0 0.2 0.4 0.6 0.8 1.0

Inlet pressure MPa

How to Adjust the Pressure

Domed
cap nut

Adjusting
screw

Pressure Reducing Valve

＋ −
R 1/8

Pressure
Pressure gauge
gauge joint

Fig. 1 Fig. 2

1. Screw the pressure gauge into the pressure gauge joint (Fig. 1).
2. Remove the domed cap nut. Checking the pressure gauge, turn the adjusting screw to adjust the reduced pressure to a desired level
(Fig. 2).
・The reduced pressure increases when the adjusting screw is turned clockwise.
・The reduced pressure decreases when the adjusting screw is turned counterclockwise.
3. After reduced pressure adjustment, attach the domed cap nut.
4. Remove the pressure gauge.

● How to remove the pressure reducing cartridge

Spring cover
1. Close the inlet-side stop valve. Open the faucet at the end to completely Tur
urn
Turnn counterclockwise
counterclockwise
release internal pressure.
Valve casing Indicator
2. Remove the round head screw and the arrow plate.
3. Turn the spring cover 90°counterclockwise.
4. Remove the pressure reducing cartridge by pulling the spring cover upward.

Arrow plate
90°
Round head screw

7-3, Futano-cho, Mizuho-ku, Nagoya, 467-0861, Japan Phone: 81-52-881-7199 Fax: 81-52-881-7201 62
www.yoshitake.jp

減圧-46
 P062-063_減圧 2011.3.9 7:33 PM ページ 2

GD-38 Series
P r e s s u r e R e d u c i n g V a l v e

Joints and Water Stop Valves Used for GD-46・38 Series Valves
● Standard type ● Dimensions and weights
JO-36UP JO-36UV:φ D = 18.6
JO-36UV JO-36UP:φ D = 20.4 G 1
R 3/4

Hexagon 38

φD
50 Weight 0.2 kg

JO-36UL JO-36UK･JO-36UL
JO-36UK G1 Rc 3/4

Hexagon 38

Hexagon 33
48 Weight 0.2 kg

● Check valve incorporated type

CV-36UP CV-36UV:φ D = 18.6
CV-36UV CV-36UP:φ D = 20.4 G 1
R 3/4

Hexagon 38

φD
50 Weight 0.2 kg

CV-36UL CV-36UK･CV-36UL
CV-36UK G1 Rc 3/4
Pressure Reducing Valve

Hexagon 38

Hexagon 33

48 Weight 0.2 kg

● Water stop valve

73

Rc 3/4 G1

･ Available with pipe end core.

63 7-3, Futano-cho, Mizuho-ku, Nagoya, 467-0861, Japan Phone: 81-52-881-7199 Fax: 81-52-881-7201
www.yoshitake.jp

減圧-00
P064-065_減圧 2011.3.9 7:33 PM ページ 1

Wat
er
Direct type Diaphragm Bronze

P r e s s u r e R e d u c i n g V a l v e

GD-25GJ・25JC・25GJ-K
The GD-25 Series achieves low-noise water supply as pressure
reducing valves for individual water supply to complex housing.
Reduced pressure can be kept highly stable against a variation of
supply water pressure. Incorporated strainer and its compact and
lightweight design ensure easy handling of piping.

GD-25GJ・25JC

Features
1. Reduced noise. Can be used even late at night.
2. Pressure balance structure can keep the reduced pressure at a constant level without being affected
by inlet pressure.
3. Incorporated strainer prevents foreign substances such as dirt and sand from flowing to the outlet side.
4. Attached pressure gauge joint allows a pressure gauge to be installed while water is supplied so that
the set pressure can be checked easily.
5. The GD-25JC incorporates check valve and the GD-25GJ-K(P) is provided with built-in pipe end core
for lining steel piping.

Specifications
Model GD-25GJ GD-25JC GD-25GJ-K GD-25GJ-K(P)
Nominal size 25A
Application City water
Inlet pressure 1.0 MPa or less
(A) 0.05-0.10 MPa〔Standard setting: 0.09 MPa〕
Reduced pressure (B) 0.10-0.22 MPa〔Standard setting: 0.20 MPa〕
(C) 0.20-0.35 MPa〔Standard setting: 0.25 MPa〕
Minimum differential pressure 0.02 MPa
Maximum pressure reduction ratio 10：1

Pressure Reducing Valve

Minimum adjustable flow rate 0.5 L/min
Fluid temperature 5-90˚C 5-40˚C
Rated flow rate 85 L/min (100 L/min when the differential pressure is 0.10 MPa or more)
Body Cast bronze (NPb-treated)
Valve seat Cast bronze (NPb-treated)
Material Spindle Brass
Valve disc FKM
Diaphragm EPDM
Connection JIS R 1 screwed (union joint) JIS Rc 1 screwed (union joint)
Pressure gauge joint JIS Rc 1/8 screwed
Outlet withstand pressure 0.42 MPa
･ The strainer is 40 mesh.
･ Available with pressure gauge (type A or type D) as optionale extra (for 0.5 MPa).
･ The accuracy of a pressure gauge is ±3% F.S.
･ The closing pressure of the check valve for the GD-25JC is 0.005 MPa or less.
･ An incombustible material is used for heat insulating material.

Dimensions (mm) and Weights (kg)

Model d L L1 H H1 Weight
GD-25GJ
H

GD-25JC R1 252 3.5 d

136 186 46
GD-25GJ-K Rc 1 250 3.9
GD-25GJ-K(P)
H1

L1
L

7-3, Futano-cho, Mizuho-ku, Nagoya, 467-0861, Japan Phone: 81-52-881-7199 Fax: 81-52-881-7201 64
www.yoshitake.jp

減圧-49
 P064-065_減圧 2011.3.9 7:33 PM ページ 2

GD-25 Series
P r e s s u r e R e d u c i n g V a l v e

Dimensions of the Valve Equipped with the Optional Pressure Gauge for GD-25GJ・25JC・25GJ-K

113.5 97.5

Equipped with the pressure gauge Type A Equipped with the pressure gauge Type D

Dimensions of the Heat Insulating Material

180 167

210
58

How to Adjust the Pressure

Wind seal tape

Pressure Reducing Valve

Pressure gauge(JIS R 1/8)

− ＋

Pressure gauge joint

Fig. 1 Fig. 2

1. Screw the pressure gauge into the pressure gauge joint (Fig. 1).
2. Remove the cap. Checking the pressure gauge, turn the adjusting screw to adjust the reduced pressure to a desired level (Fig. 2).
･ The reduced pressure decreases when the adjusting screw is turned clockwise.
･ The reduced pressure increases when the adjusting screw is turned counterclockwise.
3. After reduced pressure adjustment, attach the cap.
4. Remove the pressure gauge.

65 7-3, Futano-cho, Mizuho-ku, Nagoya, 467-0861, Japan Phone: 81-52-881-7199 Fax: 81-52-881-7201
www.yoshitake.jp

減圧-00
P066-067_減圧 2011.3.9 7:34 PM ページ 1

GD-25 Series
P r e s s u r e R e d u c i n g V a l v e

Flow Rate Characteristic Chart

●GD-25GJ･GJ-K･GJ-K (P) ●GD-25JC
Inlet pressure: 1.0 MPa Inlet pressure: 1.0 MPa
Inlet pressure: 0.5 MPa Inlet pressure: 0.5 MPa
Inlet pressure: 0.3 MPa Inlet pressure: 0.3 MPa
0.35 0.35

0.30 0.30

0.25 0.25
Reduced pressure MPa

Reduced pressure MPa

0.20 0.20

0.15 0.15

0.10 0.10

0.05 0.05

0 0

0 15 30 45 60 75 85 90 0 15 30 45 60 75 85 90
Flow rate L/min Flow rate L/min

Pressure Characteristic Chart Noise Characteristic Chart

Pressure Reducing Valve

Inlet pressure: 0.4 MPa
0.18 Reduced pressure: 0.2 MPa
Inlet pressure: 0.8 MPa
Reduced pressure MPa

0.17 Reduced pressure: 0.2 MPa

55
0.16

0.15 50
Noise dB (A)

0.14 45

0.13
40

0
0.2 0.4 0.6 0.8 1.0 35
Inlet pressure MPa

This chart shows variation in reduced pressure when the

inlet pressure of 0.5 MPa is changed between 0.25 MPa 0 15 30 45 60 75 85 90
and 1.0 MPa while the reduced pressure is set at
Flow rate L/min
0.15 MPa.
･ Distance from the sample valve to the microphone: 15 cm
･ Background noise: 30 dB (A)

7-3, Futano-cho, Mizuho-ku, Nagoya, 467-0861, Japan Phone: 81-52-881-7199 Fax: 81-52-881-7201 66
www.yoshitake.jp

減圧-51
 P066-067_減圧 2011.3.14 10:04 AM ページ 2

Ste A i Wat
am r er
Direct type Diaphragm Stainless steel

P r e s s u r e R e d u c i n g V a l v e

GD-41・43・41G・43G
Features
1. Space saving and resource saving are achieved (used materials are shown
on the body and lower cap, thus separate collection of parts for resource
recycling is easy).
2. Stainless steel (SCS14A and SUS316) is used for wetted parts, improving
corrosion resistance.
3. PTFE covers diaphragm contact surface to fluid, making the diaphragm less
liable to deteriorate and highly durable.
4. Special fluorine-contained rubber parts are resistant to corrosion.
5. Pressure balance structure can keep the reduced pressure at a constant
level without being affected by inlet pressure.
6. Closed structure keeps fluid from flowing to outside even if the diaphragm is
damaged or broken.
7. Safe fluorine grease is applied to O-ring. GD-41
8. Can be applied to piping washing, system washing, sterilization washing and
steam for sterilization.
Specifications
Model GD-41 GD-43-10 GD-43-20 GD-41G GD-43G-10 GD-43G-20
Cold and hot water Air, Carbon dioxide gas *1, Nitrogen gas
Application
Steam for washing or sterilization
Inlet pressure 0.07-2.0 MPa (0.2 MPa or less for steam for washing or sterilization) *2
(A) Yellow spring: 0.02-0.1 MPa〔Standard setting: 0.05 MPa〕
Reduced pressure (B) Red spring: 0.1-0.25 MPa〔Standard setting: 0.1 MPa〕
(C) Black spring: 0.25-0.5 MPa〔Standard setting: 0.3 MPa〕
Minimum differential pressure 0.05 MPa
Maximum pressure reduction ratio Cold and hot water: 10:1 Air, Carbon dioxide gas, Nitrogen gas: 20:1
5-90˚C
Fluid temperature
(The maximum temperature of steam for washing or sterilization is 130˚C. Allow an interval of at least four hours between steam flows.)
Body Cast Stainless steel (SCS14A)
Material Valve disc Special synthetic rubber (special FKM)
Diaphragm Heat-resistant synthetic rubber and PTFE (PTFE applied to wetted face)
Connection
Pressure Reducing Valve

JIS Rc screwed JIS 10K FF flanged JIS 20K RF flanged JIS Rc screwed JIS 10K FF flanged JIS 20K RF flanged
*1 Please contact us when using for carbon dioxide gas.
*2 The inlet pressure of the GD-43-10 is 0.07 to 1.0 MPa.
･ If using for washing steam or sterilization steam, be sure that maximum temperature is 130˚C and avoid continuous use for more than
30 minutes.

Dimensions (mm) and Weights (kg)

●GD-41・41G ●GD-43・43G
Nominal size d Weight Nominal size Weight
15A Rc 1/2 1.2 15A 2.8 (2.6)
20A Rc 3/4 1.1 20A 3.0 (2.9)
25A Rc 1 1.0 25A 4.0 (3.7)
･ The values in parentheses are the weights of the GD-43-10.

φ 85
85
136

136

d
34
34

85 195

67 7-3, Futano-cho, Mizuho-ku, Nagoya, 467-0861, Japan Phone: 81-52-881-7199 Fax: 81-52-881-7201
www.yoshitake.jp

減圧-00
P068-069_減圧 2011.3.9 7:35 PM ページ 1

GD-41・43・41G・43G
P r e s s u r e R e d u c i n g V a l v e

Nominal Sizes Selection Chart (For Air) Specifications Selection Chart

(Cold and hot water)
0.6 0.7 0.8 0.91.01.2 1.3 1.51.7 2.0
0.5 P1: Inlet pressure MPa 0.5 2.0

0.5

P1: Inlet pressure MPa

P2: Reduced pressure MPa

P2: Reduced pressure MPa

0.4 0.4 1.5

0.4

0.3 (a) 0.3 1.0

0.3
0.55
0.2 0.2 0.5

0.2 0.2
0.1
0.1 0.1 0.07 0 0.02 0.1 0.2 0.3 0.4 0.5
P2: Reduced pressure
0.05 0.1 0.05
(Air, carbon dioxide gas, and nitrogen gas)
0 0
2.0

P1: Inlet pressure MPa

3 1.5
(standard condition)

(standard condition)
Nominal
4 size
15A
Q: Flow rate m3/h

Q: Flow rate m3/h

5
(b) 1.0
6 20A
8
25A 0.55
0.5
10 0.4
    0.2
0.1
0.07 0 0.02 0.1 0.2 0.3 0.4 0.5
20 P2: Reduced pressure MPa
30 40 50 60 80 100 15
0
20
0
30
0
40
0
50
0 Controllable range
[Example] Range requiring two-stage pressure reduction
When selecting the nominal size of a pressure reducing valve whose inlet Range controllable and also compatible with
steam for washing or sterilization
pressure (P1), reduced pressure (P2), and flow rate are 0.5 MPa, 0.3 MPa, and
40 m3/h (standard condition), respectively, first find intersection point (a) of the
inlet pressure of 0.5 MPa and the reduced pressure of 0.3 MPa. Trace down
Flow Characteristic Chart
vertically from this intersection point to find intersection point (b) with the flow
Set pressure
rate of 40 m3/h (standard condition). Since intersection point (b) lies between
nominal sizes 15A and 20A, select the larger one, 20A.
Reduced pressure

* Offset pressure
･ Set the safety factor at 80 to 90%. Rated flow rate

Pressure Reducing Valve

Nominal Sizes Selection Chart (For Cold and Hot Water)
Nominal size
60
25A
40 20A
0 50 100 ％
30 15A Flow rate
V: Flow rate L/min

20 * Offset pressure
15 Set pressure Offset pressure
10 (a) 0.2 MPa or less Within 0.05 MPa
8 More than 0.2 MPa Within 0.08 MPa
6

4
Pressure Characteristic Chart
P2: Reduced pressure MPa

0.30
0.05 0.06 0.08 0.1 0.2 0.3 0.4 0.6 0.81.0 1.2 1.4 1.6 1.8 2.0
∆P: Differential pressure MPa 0.25
0.20
[Example]
0.15
When selecting the nominal size of a pressure reducing valve whose inlet
0.10
pressure (P1), reduced pressure (P2), and flow rate are 0.5 MPa, 0.3 MPa, and
10 L/min, respectively, trace up vertically from the 0.2 MPa point of differential 0.05
pressure before and after the valve to find intersection point (a) with the flow 0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0
rate of 10 L/min. Since intersection point (a) is between nominal sizes 15A and P1: Inlet pressure MPa
20A, select the larger one, 20A.
This chart shows variation in reduced pressure when the
inlet pressure of 0.25 MPa is changed to 2.0 MPa while
the reduced pressure is set at 0.20 MPa.

7-3, Futano-cho, Mizuho-ku, Nagoya, 467-0861, Japan Phone: 81-52-881-7199 Fax: 81-52-881-7201 68
www.yoshitake.jp

減圧-53
 P068-069_減圧 2011.3.9 7:35 PM ページ 2

A i Wat
r er
Direct type Diaphragm Ductile iron

P r e s s u r e R e d u c i n g V a l v e

GD-6
Features
1. High accurate controllability of reduced pressure even at small flow rate.
2. Simple in structure, less prone to fail and easy to maintain.
3. Compact and lightweight.
4. Easy to install due to screwed connections.

Specifications
Model GD-6
Application Cold and hot water, Oil, Air, Other non-dangerous fluids
Inlet pressure 0.1-1.0 MPa
(A) 0.02-0.1 MPa (Nameplate color: yellow)
Reduced pressure
(B) 0.1-0.4 MPa (Nameplate color: blue)
Minimum differential pressure 0.05 MPa
Maximum pressure reduction ratio 10:1
Application temperature 5-80˚C
Valve seat leakage None
Fluid viscosity 300 cSt or less
Body Ductile cast iron *1
Material Valve disc, valve seat Brass and bronze (FKM disc incorporated) *2
Diaphragm Stainless steel
Connection JIS Rc screwed
*1 Available with stainless steel wetted parts and all stainless steel made on request.
*2 Available with stainless steel made valve disc and valve seat on request. Also
available with PTFE disc on request. φE
･ Available with anticorrosive (fluororesin-coated) type on request.

Dimensions (mm) and Weights (kg)

Nominal size d L H H1 E Weight
10A Rc 3/8 165 243 57 155 5.5

H
15A Rc 1/2 165 243 57 155 5.5
20A Rc 3/4 185 267 76 175 8.2
Pressure Reducing Valve

d
25A Rc 1 185 267 76 175 8.2
H1

69 7-3, Futano-cho, Mizuho-ku, Nagoya, 467-0861, Japan Phone: 81-52-881-7199 Fax: 81-52-881-7201
www.yoshitake.jp

減圧-00
P070-071_減圧 2011.3.9 7:35 PM ページ 1

GD-6
P r e s s u r e R e d u c i n g V a l v e

Nominal Sizes Selection Chart (For Air) Flow Characteristic Chart

0.5 0.5
Shut-off pressure rise Offset pressure
(within 0.02 MPa) (within 0.03 MPa)
Set
Pa 0.6 0.7 0.8 0.9 1 pressure
0.4 0.5 0.4
M

Reduced pressure

Minimum adjustable
e

0.4
P2: Reduced pressure

P2: Reduced pressure

ur
ss

Rated flow rate

re

flow rate
0.3 0.3
tp
nle

0.3
:I
P1

0.2 0.2

0.2

0.1 0.1 0 5 50 100%

0.1 Flow rate

0 0

3 Nominal size 0 Pressure Characteristic Chart

(standard condition)

(standard condition)
20
4 10A
Q: Flow rate m3/h

Q: Flow rate m3/h

0 0.22
5 30
15A

Reduced pressure MPa

6
0 0.20
40
8 0 0
5 0.18
20A
10 60
0

0 0.16
80
00
25A 10 0.14
20
30 40 50 60 80 100 0 0 0 0 0 0 0 0.12
20 30 40 50 60 80 100
･ Set the safety factor at 80 to 90%.
0 0.2 0.4 0.6 0.8 1.0
Inlet pressure MPa
Nominal Sizes Selection Chart (For Water)
This chart shows variation in reduced pressure when the
inlet pressure of 0.3 MPa is changed between 0.3 MPa
100 and 1.0 MPa while the reduced pressure is set at
0.2 MPa.
80
Nominal size
25A
60

20A
40

Pressure Reducing Valve

30
V: Flow rate L/min

15A
20

10A
15

10

0.05 0.06 0.08 0.1 0.2 0.3 0.4 0.6 0.8 1.0
∆P: Differential pressure MPa

7-3, Futano-cho, Mizuho-ku, Nagoya, 467-0861, Japan Phone: 81-52-881-7199 Fax: 81-52-881-7201 70
www.yoshitake.jp

減圧-55
 P070-071_減圧 2011.3.9 7:35 PM ページ 2

Wat
er
Direct type Piston Cast iron

P r e s s u r e R e d u c i n g V a l v e

GD-7
Features
1. Simple in structure, less prone to fail and easy to maintain.
2. Insusceptible to effect of inlet pressure fluctuation due to dual valve.
3. Outstanding performance as a pressure reducer for lubricant grease and heavy oil.

Specifications
Model GD-7
Application Cold and hot water, Oil, Other non-dangerous fluids
Nominal size 20A-50A 65A-150A
Inlet pressure 0.1-1.0 MPa
(A) 0.05-0.25 MPa (A) 0.05-0.2 MPa
(B) 0.25-0.45 MPa (B) 0.2-0.5 MPa
Reduced pressure
(C) 0.45-0.7 MPa (C) 0.5-0.7 MPa
70% or less of inlet pressure (gauge pressure)
Minimum differential pressure 0.05 MPa
Maximum differential pressure 0.7 MPa
Maximum pressure reduction ratio 10:1
Application temperature 5-80˚C *1
Fluid viscosity 700 cSt or less
Body Cast iron
Valve, valve seat Phosphor bronze *2
Material
Spindle Stainless steel
Piston Bronze
Connection JIS 10K FF flanged
*1 Available with withstanding up to 120˚C.
*2 Available with stainless steel made valve and valve seat.
･ Available with the GD-7H, made of cast steel, with inlet pressure of 2.0 MPa or less
and reduced pressure of 0.7 to 1.6 MPa.

● Valve seat leakage (L/min)

Nominal size 20 25 32 40 50 65 80 100 125 150
Leakage 0.16 0.2 0.25 0.32 0.4 0.52 0.64 0.8 1.0 1.2
Pressure Reducing Valve

Dimensions (mm) and Weights (kg)

Nominal size L H H1 Weight
20A 170 535 95 20
25A 170 535 95 22
32A 180 545 100 23
40A 180 545 100 23
50A 180 565 110 26
65A 215 680 125 41
80A 260 700 135 51
H

100A 300 750 160 66

125A 360 810 190 90
150A 382 875 220 129
H1

71 7-3, Futano-cho, Mizuho-ku, Nagoya, 467-0861, Japan Phone: 81-52-881-7199 Fax: 81-52-881-7201
www.yoshitake.jp

減圧-00
P072_減圧 2011.3.9 7:36 PM ページ 1

GD-7
P r e s s u r e R e d u c i n g V a l v e

Nominal Sizes Selection Chart (For Water) Specifications Selection Chart

200 This range requires two-stage pressure
Nominal
size reduction.
150 150A
1.0
125A
100
100A
80 0.9

60
80A 0.8
65A Controllable range of the GD-7
40
0.7
30

P1: Inlet pressure MPa

50A
0.6
V: Flow rate m3/h

20

15
40A
0.5
32A

10 0.4
8
25A 0.3
6

4 20A 0.2

3
0.1

2
0
1.5 0.1 0.2 0.3 0.4 0.5 0.6 0.7
P2: Reduced pressure MPa
1
0.04 0.06 0.08 0.1 0.15 0.2 0.3 0.4 0.6 0.8 1.0
∆: Differential pressure MPa
Flow Characteristic Chart
Nominal size Shut-off pressure rise
Pressure Characteristic Chart 20A-50A Within 10% of set pressure
65A-100A Within 15% of set pressure
125A-150A Within 20% of set pressure
0.22
P2: Reduced pressure MPa

Shut-off pressure rise

Set
0.21 pressure * Offset
pressure
Reduced pressure

Pressure Reducing Valve

Minimum adjustable

Rated flow rate

flow rate

0.20

0 5 50 100％
0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 Flow rate
P1: Inlet pressure MPa * Offset pressure
This chart shows variation in reduced pressure when the inlet pressure of Offset pressure MPa
0.5 MPa is changed between 0.5 MPa and 1.0 MPa while the reduced pressure Nominal size
GD-7 GD-7H
is set at 0.2 MPa.
20A-50A Within 0.08 Within 0.23
65A-150A Within 0.11 Within 0.18

7-3, Futano-cho, Mizuho-ku, Nagoya, 467-0861, Japan Phone: 81-52-881-7199 Fax: 81-52-881-7201 72
www.yoshitake.jp

減圧-00
 P073-074_減圧 2011.3.9 7:37 PM ページ 1

Wat
er
Direct type Piston Cast iron

P r e s s u r e R e d u c i n g V a l v e

GD-7B
Features
1. Simple in structure, less prone to fail and easy to maintain.
2. Outstanding performance as a pressure reducer for lubricant grease and heavy oil.
3. Pressure balance structure provides stable reduced pressure to inlet pressure and increased
maximum pressure ratio.

Specifications
Model GD-7B
Application Cold and hot water, Oil, Other non-dangerous fluids
Nominal size 20A-50A 65A-150A
Inlet pressure 0.1-1.0 MPa
(A) 0.05-0.25 MPa (A) 0.05-0.2 MPa
(B) 0.25-0.45 MPa (B) 0.2-0.5 MPa
Reduced pressure
(C) 0.45-0.7 MPa (C) 0.5-0.7 MPa
85% or less of inlet pressure (gauge pressure)
Minimum differential pressure 0.05 MPa
Maximum pressure reduction ratio 20A-50A: 20:1 65A-150A: 15:1
Application temperature 5-80˚C *
Valve seat leakage None
Fluid viscosity 700 cSt or less
Body Cast iron
Valve NBR
Material Valve seat Stainless steel
Spindle Stainless steel
Piston Bronze
Connection JIS 10K FF flanged
* Available with withstanding up to 120˚C.
･ Available with the GD-7BH, made of cast steel, with inlet pressure of 2.0 MPa or
less and reduced pressure of 0.7 to 1.6 MPa.
Pressure Reducing Valve

Dimensions (mm) and Weights (kg)

Nominal size L H H1 Weight
20A 170 535 95 20
25A 170 535 95 22
32A 180 545 100 23
40A 180 545 100 23
50A 180 565 110 26
65A 215 680 125 41
80A 260 705 140 51
H

100A 300 755 165 66

125A 360 815 195 90
150A 382 885 225 129
H1

73 7-3, Futano-cho, Mizuho-ku, Nagoya, 467-0861, Japan Phone: 81-52-881-7199 Fax: 81-52-881-7201
www.yoshitake.jp

減圧-00
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GD-7B
P r e s s u r e R e d u c i n g V a l v e

Nominal Sizes Selection Chart (For Water) Specifications Selection Chart

200 ● Nominal sizes 20A to 50A
1.0
150

0.9
100 Nominal Controllable range of the GD-7B
size
0.8
80 150A
125A

P1: Inlet pressure MPa

0.7
60
100A
80A 0.6
40
0.5
65A
30
0.4
50A
V: Flow rate m3/h

20 0.3

15 40A 0.2

32A
10 0.1

8 0
25A 0.1 0.2 0.3 0.4 0.5 0.6 0.7
6 P2: Reduced pressure MPa
5
20A
4
● Nominal sizes 65A to 150A
3
This range requires two-stage
pressure reduction.
2 1.0

1.5 0.9
Controllable range of the GD-7B
0.8
1
P1: Inlet pressure MPa

0.04 0.06 0.08 0.1 0.15 0.3 0.4 0.6 0.8 1.0 0.7
∆P: Differential pressure MPa
0.6

0.5

0.4
Flow Characteristic Chart
0.3
Shut-off pressure rise
Nominal size
GD-7B GD-7BH 0.2
20A-50A Within 10% of set pressure Within 15% of set pressure

Pressure Reducing Valve

65A-150A Within 15% of set pressure Within 15% of set pressure 0.1

0
* Offset 0.1 0.2 0.3 0.4 0.5 0.6 0.7
Shut-off pressure rise pressure
Set P2: Reduced pressure MPa
pressure
Reduced pressure

Minimum adjustable

Rated flow rate

flow rate

0 5 50 100％
Flow rate
* Offset pressure
Offset pressure MPa
Nominal size
GD-7B GD-7BH
20A-50A Within 0.08 Within 0.23
65A-150A Within 0.11 Within 0.18

7-3, Futano-cho, Mizuho-ku, Nagoya, 467-0861, Japan Phone: 81-52-881-7199 Fax: 81-52-881-7201 74
www.yoshitake.jp

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 P075-076_減圧 2011.3.9 7:37 PM ページ 1

A i
r Pilot type Piston Ductile iron

P r e s s u r e R e d u c i n g V a l v e

GP-1000T
Features
1. Far superior to conventional pressure reducing valve in workability and
durability.
2. Free of valve seat leakage. Improved workability as a result of refinement of
sliding parts.
3. Simple and robust internal structure.
Description of GP-1000T Series model code
GP-1000T
GP-1000T
Material, S: trim parts made of stainless steel,
SS: wetted parts made of stainless steel, AS: all stainless steel
0: standard, 1: equipped with a handle,
2: for low pressure
0: flanged, 1: screwed
0: standard, 2: air loading type

Specifications
Model GP-1000T GP-1010T GP-1200T GP-1210T
Application Air, Other non-dangerous fluids
Inlet pressure 0.1-1.0 MPa
0.05-0.9 MPa GP-1010T
Reduced pressure
90% or less of inlet pressure (gauge pressure)
Minimum differential pressure 0.05 MPa
Maximum pressure reduction ratio 20:1
Application temperature 5-80˚C
Valve seat leakage None
Body Ductile cast iron
Valve Brass (NBR contained)
Material Valve seat Stainless steel
Piston, cylinder Brass or bronze
Diaphragm Stainless steel
Connection JIS 10K FF flanged JIS Rc screwed JIS 10K FF flanged JIS Rc screwed
･ Available with stainless steel made trim parts (piston, cylinder and valve) as GP-□□□□TS.
Pressure Reducing Valve

GP-1200T

Dimensions (mm) and Weights (kg)

●GP-1000T・1200T
Nominal size L H1 H Weight
15A 150 64 285 (220) 8.0
H
H

20A 155 64 285 (220) 8.5

25A 160 67 300 (235) 10.0
32A 190 82 323 (258) 14.0
H1

40A 190 82 323 (258) 14.5

H1

50A 220 93 347 (282) 20.0

L L
65A 245 100 357 (292) 30.0
80A 290 122 404 (339) 35.0 GP-1000T GP-1200T
100A 330 144 450 (385) 52.5
･ The above values in parentheses are the dimensions of the GP-1200T.
●GP-1010T・1210T
Nominal size d L H1 H Weight
H

15A Rc 1/2 150 64 285 (220) 7.0

H

d
20A Rc 3/4 155 64 285 (220) 7.0 d
25A Rc 1 160 67 300 (235) 8.5
32A Rc 1-1/4 190 82 323 (258) 12.0
H1
H1

40A Rc 1-1/2 190 82 323 (258) 12.5

50A Rc 2 220 93 347 (282) 18.0 L L
･ The above values in parentheses are the dimensions of the GP-1210T. GP-1010T GP-1210T

75 7-3, Futano-cho, Mizuho-ku, Nagoya, 467-0861, Japan Phone: 81-52-881-7199 Fax: 81-52-881-7201
www.yoshitake.jp

減圧-00
P075-076_減圧 2011.3.9 7:37 PM ページ 2

A i
Pilot type Piston Stainless steel
r

P r e s s u r e R e d u c i n g V a l v e

GP-1000TSS・1000TAS
Features
1. Stainless steel is used for wetted parts (GP-1000TSS) and all parts (GP-1000TAS), improving
corrosion resistance.
2. Free of valve seat leakage. Improved workability as a result of refinement of sliding parts.
3. Simple and robust internal structure.

Specifications
Stainless steel wetted parts All stainless steel made
Model GP-1000TSS GP-1000TAS
Application Air, Other non-dangerous fluids
Inlet pressure 0.1-1.0 MPa
Reduced pressure 0.05-0.9 MPa
Adjusted reduced pressure 90% or less of inlet pressure (gauge pressure)
Minimum differential pressure 0.05 MPa
Maximum pressure reduction ratio 20:1
Application temperature 5-80˚C
Valve seat leakage None
Body Cast stainless steel
Valve Stainless steel (NBR contained)
Material Valve seat Stainless steel
Piston, cylinder Stainless steel
Diaphragm Stainless steel
Connection JIS 10K FF flanged
GP-1000TAS

Dimensions (mm) and Weights (kg)

Nominal size L H1 H Weight
15A 150 67 288 (298) 8.3 ( 8.5)
20A 155 67 288 (298) 8.8 ( 9.0)
25A 160 70 303 (313) 10.5 (10.7)

Pressure Reducing Valve

32A 190 85 326 (336) 14.8 (15.0)
40A 190 85 326 (336) 15.3 (15.5)
50A 220 96 350 (360) 20.8 (21.0)
･ The above values in parentheses are the dimensions and weights of the GP-1000TAS.
H

Specifications Selection Chart

1.0
H1
P1: Inlet pressure MPa

0.8
Controllable range (A)
0.6 L

0.4
The valve does not fulfill
specified performance in
0.2
this range (B).

0
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9
P2: Reduced pressure MPa
Find the intersection point of the inlet and reduced pressures. If the
intersection point is within range (A), the pressures are controllable.
The valve does not fulfill specified performance if the intersection
point lies in range (B).

7-3, Futano-cho, Mizuho-ku, Nagoya, 467-0861, Japan Phone: 81-52-881-7199 Fax: 81-52-881-7201 76
www.yoshitake.jp

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 P077-078_減圧 2011.3.9 7:38 PM ページ 1

GP-1000T Series
P r e s s u r e R e d u c i n g V a l v e

Table of Corrected Cv Values

●Table of rated Cv values (Cv value when the correction factor C = 1)
Nominal size 15A 20A 25A 32A 40A 50A 65A 80A 100A
Cv values 1 2.3 4 6.5 9 16 25 36 64
Note) When the inlet pressure is more than 0.7 MPa and the pressure reduction ratio is more than 10:1, calculate the corrected Cv value by
multiplying the rated Cv value by the correction factor C obtained from the Fig. 1.

C: Correction factor
Nominal Sizes Selection Chart (Fluid: 20˚C Air) 1.0

0.9 0.
7 0.8
1.0 1.0 0.9 a
1.0 MP
re
ssu
0.8
0.9 1.0 0.9
pre
et
0.7 Inl
0.8
0.9
0.8 P1:
0 0.02 0.04 0.06 0.08 0.1
a

0.8
MP
P2: Reduced pressure MPa

P2: Reduced pressure MPa

0.7 0.7 P2: Reduced pressure MPa
e
ur

0.7 Fig. 1: Corrected Cv value

s

0.6 0.6
es
pr

0.6
let

0.5 0.5
: In

0.5 Loading Air Pressure-set Pressure Chart

P1

（A）
0.4 0.4 ●GP-1200T・1210T
0.4
1.0
0.3 0.3

Set pressure MPa

0.3 0.8
0.2 0.2
0.2 0.6
0.1 0.1
0.4
0.1 （C）
0 （D） 0 0.2

Nominal 15 A
size 30
0 0 0.2 0.4 0.6 0.8 1.0
Loading air pressure MPa
0
40
20 Basically, the set pressure to the loading air pressure is
20 A
Q: Flow rate m3/h (standard condition)

Q: Flow rate m3/h (standard condition)

60
0 as shown in the chart above. The set pressure is slightly
30 different depending on the conditions. In this case,
0
80 adjust the loading air pressure.
40 25 A
00
10
60
32 A
80 （E）
Flow Characteristic Chart
00
40 A 20
100
Shut-off pressure rise
00
（B） 30 Set (within 0.02 MPa)
50 A 00 pressure
Pressure Reducing Valve

40 Offset pressure
0 (within 0.05 MPa)
20
adjustable

* Within 0.03 MPa

Reduced
pressure

Minimum

flow rate

65 A 00
60
flow rate

when the set

Rated

0
30 pressure is
00
0
80 A 80 within 0.1 MPa
40 0
00
10
0 0 5 50 100％
60 100 A Flow rate
8 00
00
10 00 00 00 00 00 0
20 30 40 60 80 00 Pressure Characteristic Chart
10

[Example 1]
P2: Reduced pressure MPa

When selecting the nominal size of a pressure reducing valve whose inlet pressure (P1), 0.16
reduced pressure (P2), and air flow rate are 0.6 MPa, 0.4 MPa, and 1,000 m3/h (standard
0.14
condition), respectively, first find intersection point (A) of the inlet pressure of 0.6 MPa
and the reduced pressure of 0.4 MPa. Trace down vertically from this intersection point 0.12
to find intersection point (B) with the flow rate of 1,000 m3/h (standard condition). Since
intersection point (B) lies between nominal sizes 40A and 50A, select the larger one, 50A. 0.10

0.08
[Example 2]
When selecting the nominal size of a pressure reducing valve whose inlet pressure (P1),
reduced pressure (P2), and air flow rate are 0.8 MPa, 0.05 MPa, and 800 m3/h (standard 0 0.2 0.4 0.6 0.8 1.0
condition), respectively, first find intersection point (C) of the inlet pressure of 0.8 MPa P1: Inlet pressure MPa
and the diagonal line. Trace down to the left from the diagonal line to find intersection This chart shows variation in reduced pressure when the
point (D) with the reduced pressure of 0.05 MPa. Trace down vertically from intersection
inlet pressure of 1.0 MPa is changed between 0.3 MPa
point (D) to find intersection point (E) with the flow rate of 800 m3/h (standard condition).
and 1.0 MPa while the reduced pressure is set at
Since intersection point (E) lies between nominal sizes 32A and 40A, select the larger
one, 40A. 0.1 MPa.
･ Set the safety factor at 80 to 90%.

77 7-3, Futano-cho, Mizuho-ku, Nagoya, 467-0861, Japan Phone: 81-52-881-7199 Fax: 81-52-881-7201
www.yoshitake.jp

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P077-078_減圧 2011.3.9 7:38 PM ページ 2

A i
Direct type Diaphragm Bronze
r

P r e s s u r e R e d u c i n g V a l v e

GD-26G・27G
Features
1. Corrosion-resistant materials are used for wetted parts.
2. Reduced noise.
3. Pressure balance structure can keep the reduced
pressure at a constant level without being affected by inlet
pressure.
4. Maintenance and inspection can be conducted easily by
disassembling simply from the upper side.
5. Compact and lightweight, easy to handle on piping.

GD-26G

Specifications
Model GD-26G GD-27G
Application Air, Other non-dangerous fluids *
Inlet pressure 1.0 MPa or less
(A) 0.05-0.35 MPa
Reduced pressure
(B) 0.3-0.7 MPa
Fluid temperature 5-90˚C
Minimum differential pressure 0.05 MPa
Maximum pressure reduction ratio 10:1
Body Cast bronze
Valve seat Bronze
Material
Valve disc EPDM
Diaphragm EPDM
Connection JIS Rc screwed JIS 10K FF flanged
* Please contact us when using for gas containing oil. GD-27G
･ A strainer (40 mesh) is incorporated in 15A to 50A.
･ Pressure gauge connection port is JIS Rc 1/8.

Dimensions (mm) and Weights (kg)

●GD-26G ●GD-27G

Pressure Reducing Valve

Nominal size d L H H1 Weight Nominal size L H H1 Weight
15A Rc 1/2 115 159.5 37.5 1.6 25A 160 170 41 5.1
20A Rc 3/4 120 159.5 38.5 1.7 32A 200 224 57 7.5
25A Rc 1 135 170 41 2.1 40A 200 224 57 7.7
32A Rc 1-1/4 180 224 57 4.0 50A 220 239.5 61 10.9
40A Rc 1-1/2 180 224 57 4.4 65A 220 329 77 20.0
50A Rc 2 200 239.5 61 6.5 80A 230 345 82 22.0
100A 270 412 94 33.0
H
H

d
H1
H1

H1

L L L

GD-26G GD-27G 25A-50A GD-27G 65A-100A

7-3, Futano-cho, Mizuho-ku, Nagoya, 467-0861, Japan Phone: 81-52-881-7199 Fax: 81-52-881-7201 78
www.yoshitake.jp

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 P079-080_減圧 2011.3.9 7:39 PM ページ 1

A i
r Direct type Diaphragm Stainless steel

P r e s s u r e R e d u c i n g V a l v e

GD-26GS・27GS
Features
1. Corrosion-resistant materials are used for wetted parts.
2. Reduced noise.
3. Pressure balance structure can keep the reduced
pressure at a constant level without being affected by inlet
pressure.
4. Maintenance and inspection can be conducted easily by
disassembling simply from the upper side.
5. Compact and lightweight, easy to handle on piping.

GD-26GS
Specifications
Model GD-26GS GD-27GS
Application Air, Other non-dangerous fluids *
Inlet pressure 1.0 MPa or less
(A) 0.05-0.35 MPa
Reduced pressure
(B) 0.3-0.7 MPa
Application temperature 5-90˚C
Minimum differential pressure 0.05 MPa
Maximum pressure reduction ratio 10:1
Body Cast stainless steel
Valve seat Cast stainless steel
Material
Valve disc EPDM
Diaphragm EPDM
Connection JIS Rc screwed JIS 10K FF flanged
* Please contact us when using for gas containing oil.
･ A strainer (40 mesh) is incorporated in 15A to 50A. GD-27GS
･ Pressure gauge connection port is JIS Rc 1/8.
･ Available with FKM.

Dimensions (mm) and Weights (kg)

●GD-26GS ●GD-27GS
Pressure Reducing Valve

Nominal size d L H H1 Weight Nominal size L H H1 Weight

20A Rc 3/4 135 170 41 2.2 20A 160 170 41 3.9
25A Rc 1 135 170 41 2.2 25A 160 170 41 4.8
32A Rc 1-1/4 180 224 57 4.7 32A 200 224 57 8.0
40A Rc 1-1/2 180 224 57 4.5 40A 200 224 57 8.3
50A Rc 2 200 239.5 61 6.5 50A 220 239.5 61 10.8
65A 220 329 77 20.6
80A 230 345 82 22.0
100A 270 412 94 34.5
H
H

d
H1
H1

H1

L
L L

GD-26GS GD-27GS 25A-50A GD-27GS 65A-100A

79 7-3, Futano-cho, Mizuho-ku, Nagoya, 467-0861, Japan Phone: 81-52-881-7199 Fax: 81-52-881-7201
www.yoshitake.jp

減圧-00
P079-080_減圧 2011.3.9 7:39 PM ページ 2

GD-26G Series
P r e s s u r e R e d u c i n g V a l v e

Nominal Sizes Selection Chart Pressure Characteristic Chart

Reduced pressure MPa

0.8 0.9 1.0
0.7 0.7
P2: Reduced pressure MPa

P2: Reduced pressure MPa

0.12
0.7
0.6 0.6

Pa
0.11
0.6
M
e
0.5 0.5
ur

0.5 0.10
ss

0.4 0.4
re

0.09
tp

0.4
n le

0.3 0.3
:I

0.3 (a) 0.08

P1

0.2 0.2
0.2
0.1 0.1 0 0.2 0.4 0.6 0.8 1.0
0.1
Inlet pressure MPa
0 0
This chart shows variation in reduced pressure when the
inlet pressure of 0.6 MPa is changed between 0.15 MPa
Q: Flow rate m3/h (standard condition)

Q: Flow rate m3/h (standard condition)

20 Nominal size
400
and 1.0 MPa while the reduced pressure is set at
15A
30 20A 0.1 MPa.
40 600
25A 800
60 0
100
80 32A
(b) Flow Characteristic Chart
100 40A
0
200
50A Shut-off pressure rise
000 Set (within 0.02 MPa)
3
200 0
pressure Offset
400

Minimum adjustable
Reduced pressure
pressure
300 65A
80A 6000
400

Rated flow rate

flow rate
0
100A 800 0
0
600 100
800
0
100 0 0 0 0 0 0
200 300 400 600 800 1000

[Example] 0 5 50 100 %

When selecting the nominal size of a pressure reducing valve whose inlet Flow rate
pressure (P1), reduced pressure (P2), and flow rate are 0.3 MPa, 0.2 MPa, and Nominal size Pressure range Offset pressure
200 m3/h (standard condition), respectively, first find intersection point (a) of (A) 0.05-0.35 MPa Within 0.05 MPa
the inlet pressure (P1) of 0.3 MPa and the reduced pressure (P2) of 0.2 MPa. 15-100A
(B) 0.3-0.7 MPa Within 0.10 MPa
Trace down vertically from this intersection point to find intersection point (b)
with the flow rate of 200 m3/h (standard condition). Since intersection point (b)
lies between nominal sizes 25A and 32A, select the larger one, 32A.
･ Set the safety factor at 80 to 90%.

Pressure Reducing Valve

7-3, Futano-cho, Mizuho-ku, Nagoya, 467-0861, Japan Phone: 81-52-881-7199 Fax: 81-52-881-7201 80
www.yoshitake.jp

減圧-65
 P081-082_減圧 2011.3.9 7:45 PM ページ 1

A i Cast iron
r
Direct type Diaphragm Stainless steel

P r e s s u r e R e d u c i n g V a l v e

GD-400・400SS
Features
1. Pressure balance structure can keep the reduced pressure at a constant level without being affected by inlet
pressure.
2. Due to simple structure, disassembly and maintenance can be conducted easily.
3. Wide range of use due to high maximum pressure ratio.
4. Diaphragm with a large pressure sensing area has accuracy to high set pressure.
Specifications
Model GD-400 GD-400SS
Nominal size 15-25A
Application Air, Nitrogen gas *1
Inlet pressure 2.5-400 kPa
Reduced pressure (A) 0.5-1.4 kPa (B) 1.2-3.3 kPa (C) 3.0-8.0 kPa (D) 7.0-20 kPa
Working temperature 5-60˚C
Minimum differential pressure 2.0 kPa
Maximum pressure reduction ratio 400:1
Reduced pressure detection method External sensing *2
Minimum adjustable flow rate 1.2 m3/h (standard condition)
Body Cast iron Cast stainless steel (SCS14)
Valve Stainless steel
Valves seat Stainless steel
Material
Disc NBR *3
Spindle Stainless steel
Diaphragm NBR *3
Connection JIS 10K FF flanged GD-400SS
*1 Please contact us when using for other fluids.
*2 A conduit (φ8-2 m) and a joint for external sensing are optional extras.
*3 Available with FKM type.
φ 340
Dimensions (mm) and Weights (kg)
Nominal size L H1 H Weight
15A 166 86 526 29.0 (32.0)
20A 170 86 526 29.0 (32.0)
25A 170 86 526 30.0 (33.0)
･ The values in parentheses are the weights of the GD-400SS.
Pressure Reducing Valve

Flow Characteristic Chart Rc 3/8

External
Shut-off pressure rise (within 0.5 kPa) sensing port
Set
pressure
H1

Offset pressure
Reduced
pressure

Within 15%
of set pressure
flow rate

Minimum adjustable flow rate L

(minimum 0.6 kPa)
Rated

(1.2 m3/h [standard condition])

0 50 100%
Flow rate

Specifications Chart Pressure Characteristic Chart

This range requires two-stage 10.0
Reduced pressure kPa

pressure reduction.
1.0 9.5
400
9.0
Inlet pressure kPa

300 8.5
8.0
200 Controllable range 7.5
7.0
100 0 50 100 150 200 250 300 350 400
Inlet pressure kPa
2.5 22
0 5 10 15 20
This chart shows variation in reduced pressure when the inlet
0.5 pressure of 400 kPa is changed to 10 kPa while the reduced
Reduced pressure kPa
pressure is set at 8.0 kPa.

81 7-3, Futano-cho, Mizuho-ku, Nagoya, 467-0861, Japan Phone: 81-52-881-7199 Fax: 81-52-881-7201
www.yoshitake.jp

減圧-00
P081-082_減圧 2011.3.9 7:45 PM ページ 2

GD-400・400SS
P r e s s u r e R e d u c i n g V a l v e

Piping Diagram Example

Bypass

Primary pressure regulating valve

External or safety valve
sensing pipe
Strainer

GD-400/GD-400SS
Pressure reducing valve

d
Blow

5 x d or over

[Precautions] Airtight test pressure

1. Connect the external sensing part to the outlet side. Inlet pressure 400 kPa or less
2. Do not adjust needle valve of the pressure reducing valve.
Airtight A 1.8 kPa or less
3. For the outlet side pipe, use a pipe with a diameter that can keep the inside
flow velocity between 5 m/s and 15 m/s. test Reduced Pressure B 4.2 kPa or less
4. When performing pressure test or airtight test after connected to the piping, pressure range C 10 kPa or less
apply the airtest pressure specified in the right table. D 25 kPa or less
･ If pressure beyond the specified airtest pressure is applied, internal parts
may be damaged.

Chart for Selecting Nominal Sizes

●When the inlet pressure is between 2.5 kPa and 200 kPa (Fluid: 20˚C Air) Table 1: When the inlet pressure is between 200 kPa
and 400 kPa

P1: Inlet pressure kPa Rated flow rate

30 40 50 60 80 100 150 20
20 Nominal Inlet pressure (m3/h [standard condition])
20 size (kPa) Reduced pressure (kPa)
P2: Reduced pressure kPa

P2: Reduced pressure kPa

10 10
15 0.5-4 4-20
10
15A 200-400 60 60
5 5 200-300 90 90
8 20A
6 (a) 300-400 90 120

Pressure Reducing Valve

5
200-300 120 120
4
25A 300-400 120 150
400 120 190
3 1
1

0.5 0.5
Q: Flow rate m3/h (standard condition)

Q: Flow rate m3/h (standard condition)

5 5

10 10
15A [Example]
(b) Nominal size
20A When selecting the nominal size of a pressure reducing
25A valve whose inlet pressure (P1), reduced pressure (P2),
and flow rate are 10 kPa, 3 kPa, and 15 m3/h (standard
condition), respectively, first find intersection point (a) of
50 50 the inlet pressure of 10 kPa and the reduced pressure of
3 kPa. Trace down vertically from this intersection point
100 100 to find intersection point (b) with the flow rate of 15 m3/h
(standard condition). Since intersection point (b) lies
between nominal sizes 20A and 25A, select the larger
200 200
one, 25A.
･ Set the safety factor at 80 to 90%.

7-3, Futano-cho, Mizuho-ku, Nagoya, 467-0861, Japan Phone: 81-52-881-7199 Fax: 81-52-881-7201 82
www.yoshitake.jp

減圧-67
 P083-084_減圧 2011.3.9 7:46 PM ページ 1

P r e s s u r e R e d u c i n g V a l v e s

Feature Water pressure reducing valve Low pressure Low pressure / balance type
Model GD-15・15C GD-4 GD-4B

Picture

Application City water Air, Other non-dangerous fluids

Max. 800 kPa (20A-50A)
Inlet pressure 0.1-1.0 MPa Max. 300 kPa
Max. 500 kPa (65A-150A)
0.05-0.25 MPa 2-200 kPa
Reduced pressure
(Standard setting: 0.2 MPa) ･ Contact us for pressure range for each valve.
Max. temperature 60˚C 80˚C
Connection JIS Rc screwed JIS 10K FF flanged
Body Cast bronze (NPb-treated) Cast iron *
NBR (20A-50A)
Valve NBR NBR
Material Stainless steel (65A-150A)
Valve seat Cast bronze (NPb-treated) Stainless steel
Diaphragm NBR NBR
Size 15A 20A 20A-150A
・The closing pressure of the check * Available with carbon steel or stainless steel body.
valve for the GD-15C is 0.005 MPa
Others
or less.
・The strainer is 40 mesh.

Feature 316 Stainless steel General air regulator Large capacity

Model GD-8N GD-9 GP-50

Picture
Pressure Reducing Valve

Pure water, Cold and hot water, Air,

Application Air, Other non-dangerous fluids Cold and hot water
Nitrogen gas, Carbon dioxide gas, Argon gas
Inlet pressure 0.1-1.0 MPa 0.1-0.99 MPa 0.14-1.0 MPa
0.07-0.2 MPa
Reduced pressure 0.05-0.7 MPa 0.05-0.85 MPa 0.2-0.4 MPa
0.4-0.7 MPa
Max. temperature 60˚C 60˚C 70˚C
Connection JIS Rc screwed JIS Rc screwed JIS 10K RF flanged
Body Stainless steel (SUS316) Aluminum die casting Cast iron
Valve Stainless steel NBR NBR, Stainless steel
Material Valve seat Stainless steel Brass Stainless steel
Diaphragm Fluororesin NBR −
Piston & Cylinder − − Bronze
Size 6A-15A 8A-25A 125A-300A
・Available with reduced pressure of 0.02 to ・The product cannot be used for
0.2 MPa (for low pressure).
toxic and flammable gases.
Others ・Pressure gauge connection port is JIS −
Rc 1/4 screwed. ・Available with dedicated brackets.
・Available with dedicated brackets.

83 7-3, Futano-cho, Mizuho-ku, Nagoya, 467-0861, Japan Phone: 81-52-881-7199 Fax: 81-52-881-7201
www.yoshitake.jp

減圧-00
P083-084_減圧 2011.3.9 7:46 PM ページ 2

M e m o

Pressure Reducing Valve

7-3, Futano-cho, Mizuho-ku, Nagoya, 467-0861, Japan Phone: 81-52-881-7199 Fax: 81-52-881-7201 84
www.yoshitake.jp

減圧-XX