Product information and ordering 1.

→ Definitions

Safet y valves
parts (partially or completely) as well Fluorcarbon-polymere (FPM)
as springs are protected against the Elastomere made of FKM are highly
Safety valve impact of the medium by bellows. The resistant at high temperatures, have
A safety valve is a valve that automati- bellows can be designed in such a way chemical stability and low permeability
cally enables a quantity of medium to that backpressure influences are com- to gas.
discharge without the assistance of any pensated to a large extent.
Good non-swelling properties for min-
other energy than the medium itself, eral oils, greases, fuels and aromatic
thus providing protection against a Miscellaneous valves
hydrocarbons.
predetermined excessive pressure, and
is designed in such a way that it closes Pressure reducer Perfluorelastomeres (FFPM)
again to prevent the further discharge A pressure reducer (or pressure reducing Perfluorelastomeres have the advan-
of the medium once normal operating valve) is a fitting for installation in a pipe tage of excellent chemical resitance and
pressure conditions are restored. system, which makes sure that a defined a large temperature range. FFKM-seals
outlet pressure is not exceeded at the offer the highest chemical resistance of
Direct-loaded safety valve outlet side in spite of different pressures all elastomeres.
Safety valve in which the load result- at the inlet side (inlet pressure).
ing from the medium pressure under Polytetrafluorethylene (PTFE)
the valve disk is only counteracted by Overflow/control valve Non-elastic, physiologically harmless
a direct mechanical load, such as a An overflow/control valve is a valve with Polymere with excellent properties.
weight, a lever with weight or a spring, proportional control characteristics for Thermic application, an extremely high
for example. pressure maintenance, pressure control chemical resistanceand a repellent,
and for protecting pumps or plant sys- non-adhesive surface.
Standard safety valve tems against excessive pressures.
A standard safety valve is a fitting Polytetrafluorethylen Compound
which, af ter the response (begin- (PTFE Cpd)
ning of lift), attains the lift required to Lifting device PTFE and TFM-PTFE can be adapted to
release the mass flow within a pressure the various applications by the help of
increase of max. 10 %. There are no Twist-type lifting mechanism filling materials like glass, carbon and
further requirements put to the opening By twisting the knurled nut anti-clock- graphite. By adding carbon, the com-
characteristics. wise the valve spindle and the connect- pressive strength can be increased.
ed valve disc get lifted from the valve
Full-lift safety valve seat. The valve can be tested for correct
A full-lift safety valve is a fitting which, functioning and operability. Pressure
after the response (beginning of lift),
abruptly opens to the lift stopper within Lifting lever Working pressure/operating pressure
a pressure increase of 5 %. The portion The valve gets tested by opening the The working pressure / operating pres-
of the lift up to the abrupt opening (pro- valve. The valve cone gets lifted from sure is the prevailing overpressure in
portional range) is not to be more than the valve seat by pulling the lifting lever. the protected system under normal
20 % of the entire lift. operating conditions, e.g. the required
overpressure for carrying out a process
Proportional safety valve Seals step.
A proportional safety valve is a fitting
which opens almost continuously as a Nitrile Butadiene Rubber (NBR) Response pressure
function of the increase in pressure. In Sealing material with good techno- The response pressure is the set pres-
this respect, there is no abrupt opening logical properties and a wide range of sure at which a safety valve starts to
without an increase in pressure over a applications. open under operating conditions.
range of more than 10 % of the lift. After
Good non-swelling properties in Set pressure
the response (beginning of lift) these
aliphatic hydrocarbons like propane or The set pressure is the overpressure at
safety valves reach the lift required
butan. which a safety valve starts to audibly
for discharging the mass flow within a
open under test bench conditions (at-
maximum pressure increase of 10 %. Ethylene-Propylene-Diene-Mono- mospheric back-pressure).
mere Rubber (EPDM + EPDM Spezial)
Diaphragm safety valve
Elastomere seals made of EPDM and Opening pressure/blow-off pressure
A diaphragm safety valve is a direct-
peroxied cross-linked EPDM have a very The opening pressure / blow-off pres-
loaded safety valve in which the sliding
good resistance against ozone, aging and sure is the overpressure at which the
and rotary parts as well as springs are
wheatering. Good non-swelling proper- safety valve reaches the lift required
protected against the impact of the
ties in hot water and steam, suds and for discharging the mass flow; it equals
medium by a diaphragm.
acids and chemical bases. the response pressure plus the opening
Bellows safety valve pressure difference.
A bellows safety valve is a direct-
loaded safety valve in which sliding

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 Definitions
1.1.1

Closing pressure According to the zone the equipment is

The closing pressure is the static pres- to be used in, then they must be fitted
sure on the inlet side at which the valve with corresponding protective mecha-
disk comes into contact with the seat nisms.
again or at zero lift.
For each category and zone within
equipment group II, specially suitable
General notes
safety valves, overflow valves and pres-
sure reducing valves from our product
Information relating to the placing
range are available. Please contact our
of an order
technical sales (see page 1.3) for appli-
When ordering a safety fitting please
cations in potentially explosive areas.
make sure to include the following
details:
Marking of approved safety valves
-- Article number
-- Size of connection
All of our approved safety valves which
-- Set pressure
have been tested by the TÜV Inspection
-- Flow medium
Authority and in accordance with the
-- Temperature of medium
European Pressure Equipment Direc-
-- Required blow-off capacity
tive are marked on the bonnet or on
an affixed type plate with the full TÜV
Please observe our attached general
approval number and the CE mark in-
terms of sales!
cluding the identification number of the
notified body.
ATEX – Explosions Prevention

European Directive 2014/34/EU for

“Equipment- and Protective Sys-
tems intended for use in poten-
tially explosive atmospheres”: The
directive is to be applied to products
which are to be used in a potentially
explosive area or in connection with a TÜV SV xx-xxx xx D xx x
potentially explosive area. or D/G
or H
A potentially explosive area or po-
TÜV symbol or D/G/H
tentially explosive atmosphere is a
or W
combination of
Safety valve or F
I) a flammable media in the form of gas- or F/K/S
ses, vapours, haze or dusts or SOL
Year of the component test
II) and air
III) under atmospheric conditions, Component test number
IV) in which after ignition has taken place,
the combustion process is transferred to With code letters
the whole of the unburned mixture. D, D/G, D/G/H and F, F/K/S
smallest diameter d 0
Goetze valves are in principle suitable
in front of the valve seat in mm
for use in Exzones and for this purpose
with code letter H: no information
have been subjected to a conformity
with code letterW: connection size in mm
valuation process according to Direc-
tive 94/9/EC. Within the scope of these
examinations an analysis of the danger Code letters:
as a potential source of ignition accord- G suitable for gasses
ing to EN 13463-1 was carried- out with D suitable for steam
the following results: H suitable for heating systems according to DIN 4751 and DIN EN 12828
D/G/H suitable for heating systems according to DIN 4751 and DIN EN 12828
-- The valves do not have a potential
W suitable for water heating systems according to DIN 4753
source of ignition and therefore do
F suitable for liquids
not fall in the scope of application of
F/K/S suitable for stationary pressure vessels for granular or powdery materials
ATEX.
and for vehicle containers for liquid, granular or powdery materials
-- Provided that the individual operating
SOL designed for the blowing-off of water and water mixtures from closed,
conditions in the Ex-zone are taken
intrinsically safe solar heating systems
into account, the valves may be used
in specific applications. coefficient of discharge αw (Kdr)

A report and certificate from the TÜV or discharge mass flow rate
SÜD about the special examination of or with code letter H and SOL: kW
our valves according to European test with code letter W: kW (for valve sizes > DN 25)
specifications exists.
Set pressure p in bar

CE Mark with notified body: CE 0036

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Definitions
1.1.2

Dimensioning of pressure Dimensioning of the pressure

Pressure loss ∆p results, depending on
reducing valves with K vs value reducing valve the application, from the total length
of the pipework, the number of pipe
The application and dimensioning of Pressure reducing valves that are di- fittings and the nominal diameter of the
pressure reducing valves in building mensioned to be too large work with a pipes. When selecting the correct nomi-
technology is governed according to very low valve load and should thus not nal diameter, the max. permitted flow
DIN EN 1567, and the correct valve be overdimensioned. velocity is also to be taken into account,
size is selected using the diagrams on besides the pressure loss, for reasons
Decisive factors for economical dimen- of noise reduction.
the corresponding data sheets for the
sioning of the pressure-reducing valve
relevant pressure reducing valve (e.g. As the nominal diameter increases, the
include:
681 or 682). flow velocity in the pipe decreases. The
-- the required flow volume Q in m³/h total pressure loss ∆p in the pipe thus
Due to the various operational require-
-- the total pressure drop between the becomes smaller.
ments in the industry, such as pressure,
fitting inlet and the appliance as pres-
temperature and operating medium, Below is a list of the recommended ma-
sure loss ∆p in bar
the method of calculation using the val- ximum flow velocities in pipes, which
-- the max. flow velocity in the following
ve-specific Kvs value according to DIN should not be exceeded:
pipes in m/s
EN 60534-2-3 is common and widely
used for industrial applications. The Kvs
The required flow volume Q (m³/h) is
value enables the maximum possible
available in most cases and the quantity
flow volume for a valve to be calculated.
needed at the appliance is based on the
In non-metric unit systems (SI units),
respective application.
the C vs value is often mentioned, which
is equivalent to the Kvs value.
Reference values for flow velocities
In most applications, it is sufficient to
perform valve dimensioning with a Flow velocity [m/s]
small amount of effort, as described in
DIN EN 60534-2-3. The simplified cal- Liquids (water and similar substances)
culation method shown in this chapter
provides adequate results for this. Suction pipes from pumps 0.5...1.0

Pressure pipes from pumps 1.5...3.0

Definition of the K V Value
(C V Value) Water mains 1.0...2.0

Cooling water pressure pipes 1.0...3.0

The K V value (CV value) refers to a water
flow volume in m3/h (U.S. gallons/min) Cooling water suction pipes 0.5...1.0
with a temperature between 5°C and
40°C (40°F to 100°F) and with differen-
Other liquids
tial pressure Δ∆p of 1 bar (1psi) between
the inlet and outlet of the fitting for a Highly viscose liquids 1
determined valve position. The relati-
onship between the K V and CV values is Oil pipelines 1.5…2
K V=0.865 • CV.
Thin hydraulic oil 3.5
For the max. position of the valve
(H=100%), the K V value is referred to as Pipelines for gases
the K VS value (CVS value) of the fitting.
Compressed air lines (depending on length) 15...25

Technical gases over 4 bar 15…40

Vapour lines

Flash steam in condensate lines 15 ... 25

Saturated steam lines

up to 1 bar (a) < 10 m/s

1 to 2 bar (a) 10…15 m/s

2 to 5 bar (a) 15…25 m/s

5 to 10 bar (a) 25…35 m/s

10 to 40 bar (a) 35…40 m/s

40 bar(a) < 60 m/s

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 Definitions
1.1.3

Continuation: Dimensioning of the pressure reducing valve

In order to have sufficient reserves in the end area of the pressure reducing valve, the K V value
determined for the pressure reducing valve from the calculation described below is to be multiplied
by a dimensioning factor (DF) of 1.3. The next largest K VS value for the desired pressure reducing
valve is then chosen from the table on the data sheet. This ensures secure functioning in the range
of around 10 - 80% of the control range.
The operating and setting pressures stated in the following examples are stated as overpressure, as
is common. However, the calculations are made with absolute pressures. For instance, an absolute
pressure of 6 + 1, i.e. 7 bar(a), is calculated with a setting pressure of 6 bar overpressure. What’s
more, it should be noted that the dimensioning should be performed with the greatest flow rate and
the smallest pressure difference.

Calculation for liquids

Example 1:
A pressure reducing valve is being sought for water with a temperature of 60°C. It should ensure a
flow volume of 28 m³/h with upstream pressure of p1 = 8bar overpressure and downstream pressure
in the range of p2 = 4-6 bar overpressure.
The following is given:
The necessary flow volume: Q = 28 m³/h
The pressure in front of the valve: p1 = 9 bar (a)
Selected setting pressure: p2 = 7 bar (a)
The minimum pressure drop: p1-p2 = ∆p = (9 – 7) bar = 2 bar
The density of water at 60°C: ⍴ = 983,2 kg/m³

⍴
For liquids (incompressible fluids), the following applies: Kv = Q
1000 x ∆p

983,2 m3
and in the example: Kv = 28 = 19.63
1000 x 2 h

Multiplied by DF=1.3 makes: 19.63 m³/h x 1.3 = 25.5 m³/h

The type 682 pressure reducing valve made from red brass in the nominal diameter DN 80 with a
K VS value of 26 m³/h is chosen.
To check the suitable pipe nominal diameter after the pressure reducing valve, the following applies:
Q 28 m
w = 353 = 353 = 1,54
d2 802 s

w = flow velocity in m/s

d = nominal diameter of the pipeline in mm

The nominal diameter after the pressure reducing valve is correctly selected in DN 80.

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Definitions 1.1.4

Calculation for gases

When calculating for gases, it is to be verified beforehand whether the flow is in the subcritical or
overcritical range. To make a distinction, p2 = p1/2 = ∆p can be used for a rough calculation.

p1
1. For subcritical flows, i.e. if ∆p < the following applies:
2
QN ⍴N x (t1 + 273)
Kv =
519 ∆p x p2
p1
2. For overcritical flows, i.e. if ∆p > the following applies:
2
QN
Kv = ⍴N x (t1 + 273)
259.5 x p1

Example 2:
A pressure reducing valve is being sought for a nitrogen line. The consumer requires 500 to 3000
Nm³/h gas at a temperature of 20°C for operations. Upstream pressure is p1 = 40-45 bar (overpres-
sure) from the gas supply. The minimum application pressure at the appliance is 10 bar (overpres-
sure). However, the max. permitted downstream pressure is usually p2 = 15 bar.
The following is given:
The necessary max. flow volume: QN = 3000 Nm³/h (under normal conditions)
Lowest pressure in front of the valve: p1 = 41 bar (a)
Selected setting pressure: p2 = 16 bar (a)
The minimum pressure drop: p1-p2 = ∆p = (41 – 16) bar = 25 bar
Nitrogen temperature in operation: t1 = 20°C
Nitrogen standard density: ⍴n = 1.25 kg/m³
As ∆p = (41 – 16) bar = 25 bar > p1/2 overcritical flow is used for calculations:
3000
Kv = 1.25 x (20 + 273) = 5.4 m³/h
259.5 x 41

Multiplied by DF makes: 5.4 m³/h x 1.3 = 7.02 m³/h

The type 684 pressure reducing valve made from red brass in the nominal diameter DN 40 with a
K VS value of 9.4m³/h is chosen.
To check the suitable pipe nominal diameter after the pressure reducing valve, the flow volume has
to be converted to operating conditions:
1 T m3
Q = QN • •
p 273 h

Q = flow volume in an operational condition in m³/h

p = absolute operating pressure in the pipe in bar (a)
T = absolute temperature of the medium in K

The operating flow volume Q is thus:

3000 (20 + 273) m3

Q= • = 201.2
16 273 h

To check the suitable pipe nominal diameter after the pressure reducing valve, the identical relation-
ship as for liquids can be used:

Q 201.2 m
w = 353 = 353 = 44.4
d2 402 s

The pipe nominal diameter after the pressure reducing valve is already very close to the limit in
DN40. Expanding the nominal diameter to at least DN50 (w =28.4 m/s) is thus recommended.

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1.1.5 Definitions

option S62

Inductive sensor for open/closed indication on safety valves

Goetze selects specific sensors for indicating the open/closed position on safety valves.
The inductive sensor monitors the position of the valve spindle and is installed in the upper cap/
housing of a safety valve. Depending on the design, the sensor can be attached either on the side or
vertically from above on the safety valve (see Fig. 1 and 2).

Fig. 1: Sensor latterally Fig. 2: Sensor on top

Technical Data for inductive sensor

Goetze standard sensors L-2752 L-2753 L-2649

Manufacturer code IEC200 IFC275 IF503A

Size of sensor M8 M12 M12

Pressure rating 100bar 100bar 100bar

Active sensor surface material 1.4404 (316L) 1.4404 (316L) 1.4404 (316L)

Output function normally open normally open normally open

Operating voltage 10 – 36 Volt (DC) 10 – 30 Volt (DC) 10 – 36Volt (DC)

Current consumption <20mA <10mA <20mA

Electrical design PNP PNP PNP

Protection IP69K IP69K IP69K

Ambient temperature -25 – 70°C -40 – 85°C -40 – 60°C

ATEX - /- - /- Ex II 3G Ex nA IIC T6 Gc X

Display switching status 4x90° LED 4x90° LED 4x90° LED

Connection cable, 5m L-2626 L-2626 L-2689

Manufacturer code EVT004 EVT004 EVC05A

ATEX - /- - /- Ex II 3G Ex nA IIC Gc

Temperature range -25 – 100°C -25 – 100°C -20 – 60°C

Further functions and limit switch systems available on request

Scope of delivery:
-- The sensor is installed on the safety valve and set to the maximum stroke of the valve
-- An electric function test is performed on the installed sensor before final assembly
-- Connection cable with connector, 5 m cable length, and terminal assignment plan
(for ATEX sensor with suitable ATEX cable)

The sensors stated above are selected by the manufacturer according to valve type and nominal diameter.
When ordering, please only state option S62 and the addendum ATEX, if required.

The above data is based on the technical specifications of the manufacturer, ifm electronic gmbh.
If in doubt, the manufacturer‘s technical data sheets are binding and must be checked in detail.
The data sheets will be forwarded on request.

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→ General information about the hygienic valves

Dead space ratio

The dead space ratio is determined by the ratio of the total inlet length L (usually the base of the container lid to the top of the seat) to the
diameter of the inlet pipe at the widest point D. A large dead space ratio generally leads to poorer cleanability of the area under conside-
ration. Therefore, the smaller the dead space ratio, the better the cleanability of this area.

Below you will find a schematic diagram of the dead space ratio. The information on the actual dead space ratio L/D is given in the corre-
sponding data sheet or in a separate dimensional drawing (for special connections).

1)

1)
1)

Type 400 Type 4000 Type 4020

1)
1)

Type 4040 Type 4060

1)
Actual dimension L depends on the connection piece on the container side.

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 Surface qualit y for hygienic safet y valves according to Goetze standard

Surface position Comment Surface definition according to Goetze standard

Primary surface in contact with medium Primary area in permanent contact with medium If necessary, increased surface quality as an additional
option.
A : Valve inlet area
The weld seam is ground internally in the inlet area as
B : Valve disc lower surface standard.
C : Weld seam (if present)

Secondary surface in contact with medium Surface is not in contact with medium when the Taken into account seam is not ground as standard and is
valve is closed, the surface should be suitable to therefore not considered in the surface quality.
D : inner surface blow-out area
ensure efficient cleaning (CIP and COP).
E : Weld seam

Outer surface The surface is not in contact with the medium and is No technical requirements for the surface quality. Taken into
therefore not relevant for CIP/COP cleaning. A clean, account seam is not ground as standard and is therefore not
F : Outer surface of body, housing, cap
that is not in contact with the medium smooth surface is nevertheless required. included in the surface quality. If necessary, increased sur-
face quality, as an additional option.
Add-on components such as valve clamps or lifting levers
are not included.

Area not in contact with medium For valve versions with diaphragm or bellows, this No surface quality requirements, as not in contact with the
area is permanently separated from the medium. medium.
G : area above the spindle seal which
is shielded from the medium

D
B

F
A

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V-301
Overview of surfaces and order codes for the hygiene valves

Series and Primary surface Secondary sur- Surface weld seams Outer mechanically Electropolished Comparison primary
series-specific option in contact with face in contact D, E, F surface polished surface in contact
medium with medium Ra max. (µm) F (mechanically with medium
A, B, C D, E ((1) untreated) Ra max. (µm) machined or A, B, C
Ra max. (µm) Ra max. (µm) ((2) electropolished) polished)

DIN 11866,
ASME
Table 3
BPE
Hygienic class

400 standard 0,75 1,5 (1) 1,5 A, B, C, D, F - H3 SF3

400 option P05 0,375 1,5 (1) 1,5 A, B, C, D, F - H4 SF1

400 option P07 0,375 0,75 (2) 0,75 A, B, C, D, E, F A, C, D, E, F HE4 SF6

400 option P09 0,375 0,75 0,75 0,75 A, B, C, D, E, F A, C, D, E, F HE4 SF4

4000 standard 0,75 1,5 (1) 1,5 A, B, C, D, F - H3 SF3

4000 option P05 0,375 1,5 (1) 1,5 A, B, C, D, F - H4 SF1

4000 option P07 0,375 0,75 (2) 0,75 A, B, C, D, E, F A, B, C, D, E, F HE4 SF6

4000 option P09 0,375 0,75 0,75 0,75 A, B, C, D, E, F A, B, C, D, E, F HE4 SF4

4020 standard 0,75 1,5 (1) 1,5 A, B, C, D, F - H3 SF3

4020 option P05 0,375 1,5 (1) 1,5 A, B, C, D, F - H4 SF1

4020 option P07 0,375 0,75 (2) 0,75 A, B, C, D, E, F A, B, C, D, E, F HE4 SF6

4020 option P09 0,375 0,75 0,75 0,75 A, B, C, D, E, F A, B, C, D, E, F HE4 SF4

4040 standard 0,75 0,75 (1) 1,5 A, B, C, D, F - H3 SF3

4040 option P05 0,375 0,75 (1) 1,5 A, B, C, D, F - H4 SF1

4040 option P07 0,375 0,625 (2) 0,75 A, B, C, D, E, F A, B, C, D, E, F HE4 SF5

4040 option P09 0,375 0,5 0,75 0,75 A, B, C, D, E, F A, B, C, D, E, F HE4 SF4

No, electropo-
4040 flange standard 0,75 - - 1,5 A, F H3 SF3
lished before
4040 flange welding is not
0,375 - - 0,75 A, F H4 SF1
option P05 advisable

4060 standard 0,75 0,75 (1) 1,5 A, B, C, D, F - H3 SF3

4060 option P05 0,375 0,75 (1) 1,5 A, B, C, D, F - H4 SF1

4060 option P07 0,375 0,625 (2) 0,75 A, B, C, D, E, F A, B, C, D, E, F HE4 SF5

4060 option P09 0,375 0,5 0,75 0,75 A, B, C, D, E, F A, B, C, D, E, F HE4 SF4

4060 Pipe plug No, electropo-
0,75 - - 1,5 A, F H3 SF3
standard lished before
4060 Pipe plug welding is not
0,375 - - 0,75 A, F H4 SF1
option P05 advisable

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