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Es70 44 vx2

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36 views54 pages

Es70 44 vx2

Uploaded by

Tran Van Phuc

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Direct Operated 2 Port Solenoid Valve New

® Note)

Note) For air and

water only

Air Medium Water Oil Steam RoHS

vacuum ∗ Can be used with
heated water.

Large flow rate Compact Lightweight

Height Weight
Flow rate

20% More flow ∗ 10 % Smaller∗ (Size 1)

30 % Lighter∗
(Size 1, Aluminum body)
(Size 1)
New VX
∗ Comparison with SMC conventional Conventional model
model
Body
material
Air
Aluminum, Resin
Enclosure
Water/Oil/
Medium vacuum/Steam IP65∗
C37 (Brass), ∗ Electrical entry
Stainless steel Flat terminal type
terminal is IP40.

With One-touch fittings

68 mm
61 mm

(Resin body)
Power
consumption
4.5 W (Size 1)

7W (Size 2)

10.5 W (Size 3)
(DC/N.C. valve)
Bracket
Standard
equipment

Air Medium
vacuum

Manifold Solenoid coil type Valve type

Material • Body/PPS • Insulation type Class B/H N.C. N.O.
• Base/Aluminum • Fluid temperature
• Seal/NBR, FKM Class B/Max. 60°C
Class H/Max. 183°C

Class B Class H

Series VX21/22/23
CAT.ES70-44D
Direct Operated 2 Port Solenoid Valve

Air Medium Water Oil Steam

Clearance
By providing a bumper and clearance,
vacuum ∗ Can be used with we reduced the collision sound of the
heated water. core when ON (when the valve is
Enclosure open). Because of the clearance, when
using highly viscous fluids such as oil,
IP65 the armature does not get stuck and
the responsiveness when OFF (when
the valve is closed) is improved.

Flame resistance Power consumption

UL94V-0 conformed ∗ DC/Class B, N.C. valve

Flame resistant mold coil material 4.5 W (Size 1)

Low-noise
7 W (Size 2)
construction
10.5 W (Size 3)
Metal noise reduced Improved armature
by the rubber bumper
durability
Piping variations Body material
Thread piping, One-touch fitting
Air Aluminum, Resin
Water/
Oil/ C37 (Brass),
Medium
vacuum/ Stainless steel
Steam

Full-wave rectifier type (AC specification: Insulation type Class B/H)

Improved durability Improved OFF response
Service life is extended by the special construction. Specially constructed to improve the OFF response
(compared with current shading coil) when operated with a higher viscosity fluid such as oil.
Reduced buzz noise Low-noise construction
Rectified to DC by the full-wave rectifier, resulting in a Specially constructed to reduce the metal noise
buzz noise reduction. during operation.
Reduced apparent power ∗ Class B, N.C. valve
10 VA → 7 VA (Size 1) 20 VA → 9.5 VA (Size 2)
32 VA → 12 VA (Size 3)

Variations
<Fluid>
∗ Can be used with
Applicable fluid ∗1 heated water.
Model
Air Medium vacuum Water Oil Steam
For Air
— — — —
VX20 Page 5
For Medium vacuum ∗2
— — —
VX24 Page 10
For Water ∗2
— — —
VX22 Page 14
For Oil ∗2 ∗2
— —
VX23 Page 16
∗ Can be used with
For Steam heated water. ∗2 ∗2 ∗2
—
VX25 Page 18

∗1 For details, refer to pages 45 and 46. ∗2 Refer to the individual specifications for each fluid.

<Body Size>
Body Orifice diameter
Model Port size
size 2 mmø 3 mmø 4 mmø 5 mmø 7 mmø 8 mmø 10 mmø Note)
1/8, 1/4
VX214 Size 1 — — — —
One-touch fitting: ø6, ø8
1/4, 3/8
VX225 Size 2 — — — — —
One-touch fitting: ø8, ø10
1/4, 3/8, 1/2
VX236 Size 3 — — — — —
One-touch fitting: ø10, ø12
Note) N.C. only
Features 1
INDEX Direct Operated 2 Port Solenoid Valve
Series VX21/22/23

Specifications
Single Unit/Manifold: Specifications........................................ 2
Common Specifications ................................................................ 3
Selection Steps ................................................................................. 4

For Air

For Air
Model/Valve Specifications, Fluid and Ambient Temperature, Valve Leakage Rate ... 5, 6
How to Order (Single Unit) ...................................................... 7
Model/Valve Specifications, Fluid and Ambient Temperature, Valve Leakage Rate ...8
How to Order (Solenoid Valve for Manifold, Manifold Base),
Blanking Plate Assembly Part No., How to Order Manifold Assembly (Example) ... 9

For Medium
Vacuum
For Medium Vacuum (0.1 Pa·abs or more)
Model/Valve Specifications, Fluid and Ambient Temperature, Valve Leakage Rate ... 10
How to Order (Single Unit) .................................................... 11

For Water
Model/Valve Specifications, Fluid and Ambient Temperature, Valve Leakage Rate ... 12
How to Order (Solenoid Valve for Manifold, Manifold Base),
Blanking Plate Assembly Part No., How to Order Manifold Assembly (Example) ... 13

For Water

For Oil
Model/Valve Specifications, Fluid and Ambient Temperature, Valve Leakage Rate ... 14
How to Order (Single Unit) .................................................... 15

For Oil

For Steam
Model/Valve Specifications, Fluid and Ambient Temperature, Valve Leakage Rate ... 16
How to Order (Single Unit) .................................................... 17

For Steam ∗ Can be used with heated water.

Model/Valve Specifications, Fluid and Ambient Temperature, Valve Leakage Rate ... 18
How to Order (Single Unit) .................................................... 19

Special Options
Special Options .............................................................................. 21
UL-compliant ....................................................................................24
Construction
Single Unit.....................................................................................26
Construction

Manifold..........................................................................................27
Dimensions (Single Unit) Body material: Aluminum ......... 28
Body material: Resin .................. 30
Body material: C37, Stainless steel .. 32
Dimensions

(Manifold) Base material: Aluminum ........... 35

Replacement Parts ........................................................................36
Glossary of Terms .........................................................................37
Solenoid Valve Flow-rate Characteristics .......................... 38
Flow-rate Characteristics ...........................................................43
Specific Product Precautions ...................................................45
1
Direct Operated 2 Port Solenoid Valve

Series VX21/22/23
For Air, Medium Vacuum, Water, Oil and Steam

Variations

Single Unit (For Air, Medium Vacuum, Water, Oil and Steam)
 Valve type  Electrical entry
Normally Closed (N.C.)  Grommet
Normally Open (N.O.)  Conduit
 DIN terminal
 Solenoid coil type  Conduit terminal
Insulation type: Class B, Class H  Flat terminal

 Rated voltage
Normally Closed (N.C.) Normally Open (N.O.)
100 V/200 V/110 V/230 VAC
(220 V/240 V/48 V/24 VAC) Size Size 1 Size 2 Size 3
24 VDC (12 VDC) 2 mmø  — —
Voltage in ( ) indicates special voltage. 3 mmø  — —
 Material 4 mmø —  —
Orifice diameter 5 mmø  — 
Body — Aluminum, Resin, C37 (Brass),
7 mmø —  —
Stainless steel
Seal — NBR, FKM∗ 8 mmø — — 
∗ Refer to individual pages for details of each fluid. 10 mmø — — ∗
1/8, 1/4 1/4, 3/8 1/4, 3/8, 1/2
Port size
ø6, ø8 ø8, ø10 ø10, ø12
∗ N.C. only

Manifold (For Air, Medium Vacuum)

 Valve type  Electrical entry
Normally Closed (N.C.)  Grommet
Normally Open (N.O.)  Conduit
 DIN terminal
 Manifold type  Conduit terminal
Common SUP type  Flat terminal
Individual SUP type

 Solenoid coil type Manifold

Insulation type: Class B Size Size 1 Size 2 Size 3
2 mmø  — —
 Rated voltage 3 mmø  — —
100 V/200 V/110 V/230 VAC Orifice diameter 4 mmø —  —
(220 V/240 V/48 V/24 VAC) 5 mmø  — 
24 VDC (12 VDC)
7 mmø —  
Voltage in ( ) indicates special voltage.
Common SUP type IN 3/8
Port size

 Material (Air) OUT 1/8, 1/4

Body — Resin Individual SUP type IN 1/8, 1/4
Base — Aluminum (Medium vacuum) OUT 3/8
Seal — NBR, FKM

2
Series VX21/22/23
Common Specifications

Specifications
Standard Specifications

Valve construction Direct operated poppet

Withstand pressure 2.0 MPa (Resin body type 1.5 MPa)
Valve Body material Aluminum, Resin, C37 (Brass), Stainless steel
specifications Seal material Note 3) NBR, FKM
Enclosure Dust-tight, Water-jet-proof type (IP65) Note 1)

For Air
Environment Location without corrosive or explosive gases
AC 100 VAC, 200 VAC, 110 VAC, 230 VAC, (220 VAC, 240 VAC, 48 VAC, 24 VAC) Note 2)
Rated voltage
DC 24 VDC, (12 VDC) Note 2)
Coil Allowable voltage fluctuation ±10% of rated voltage
specifications Allowable leakage AC 5% or less of rated voltage
voltage DC 2% or less of rated voltage

For Medium
Coil insulation type

Vacuum
Class B, Class H
Note 1) Electrical entry flat terminal type terminal is IP40.
Note 2) Voltage in ( ) indicates special voltage. (Refer to page 21.)
Note 3) For seal material/EPDM, refer to X332. (Refer to page 23.)
Be sure to read “Specific Product Precautions” before handling.

For Water
Solenoid Coil Specifications
Normally Closed (N.C.) Normally Open (N.O.)
DC Specification DC Specification

For Oil
Class B Class B
Size Power consumption (W) Note 1) Temperature rise (°C) Note 2) Size Power consumption (W) Note 1) Temperature rise (°C) Note 2)
Size 1 4.5 50 Size 1 7.5 60
Size 2 7 55 Size 2 8.5 70
Size 3 10.5 65 Size 3 12.5 70

For Steam
Class H Class H
Size Power consumption (W) Note 1) Temperature rise (°C) Note 2) Size Power consumption (W) Note 1) Temperature rise (°C) Note 2)
Size 1 9 100 Size 1 9 100
Size 2 12 100 Size 2 12 100
Size 3 15 100 Size 3 15 100
Note 1) Power consumption: The value at ambient temperature of 20°C Note 1) Power consumption: The value at ambient temperature of 20°C
and when the rated voltage is applied. (Variation: ±10%) and when the rated voltage is applied. (Variation: ±10%)
Note 2) The value at ambient temperature of 20°C and when the rated Note 2) The value at ambient temperature of 20°C and when the rated
voltage is applied. The value depends on the ambient environ- voltage is applied. The value depends on the ambient environ-

Special Options
ment. This is for reference. ment. This is for reference.

AC Specification (Built-in Full-wave Rectifier Type) AC Specification (Built-in Full-wave Rectifier Type)
Class B Class B
Size Apparent power (VA) Note 1) 2) Temperature rise (°C) Note 3) Size Apparent power (VA) Note 1) 2) Temperature rise (°C) Note 3)
Size 1 7 60 Size 1 9 60
Construction

Size 2 9.5 70 Size 2 10 70

Size 3 12 70 Size 3 14 70

Class H Class H
Size Apparent power (VA) Note 1) 2) Temperature rise (°C) Note 3) Size Apparent power (VA) Note 1) 2) Temperature rise (°C) Note 3)
Size 1 9 100 Size 1 9 100
Dimensions

Size 2 12 100 Size 2 12 100

Size 3 15 100 Size 3 15 100
Note 1) Apparent power: The value at ambient temperature of 20°C and Note 1) Apparent power: The value at ambient temperature of 20°C and
when the rated voltage is applied. (Variation: ±10%) when the rated voltage is applied. (Variation: ±10%)
Note 2) There is no difference in the frequency and the inrush and ener- Note 2) There is no difference in the frequency and the inrush and ener-
gized apparent power, since a rectifying circuit is used in the AC. gized apparent power, since a rectifying circuit is used in the AC.
Note 3) The value at ambient temperature of 20°C and when the rated Note 3) The value at ambient temperature of 20°C and when the rated
voltage is applied. The value depends on the ambient environ- voltage is applied. The value depends on the ambient environ-
ment. This is for reference. ment. This is for reference.

3
Series VX21/22/23
Selection Steps

Selection Steps
Step 1 Select the fluid.
Item Selection item Page Symbol
Air Page 5, 6 0
Water Page 14 2
Select the fluid.
Medium
Oil Page 16 3 q VX2 3 0 A A
vacuum Page 10 4 q
Steam Page 18 5
∗ Can be used with heated water.

Step 2 Select “Body material”, “Port size” and “Orifice diameter” from “Flow rate — Pressure” of each fluid.
Item Selection item Symbol

Select from “Flow Size Size 3 3 w

e
rate — Pressure.”
VX2 3 0 A A
Body material Aluminum
 Body material
 Port size Port size 1/8 A e
 Orifice diameter w
Orifice diameter 2

Step 3 Select electrical specification.

Item Selection item Symbol
Voltage 24 VDC
Select electrical
specification. Electrical entry Grommet
A r VX2 3 0 A A
r

Step 4 For special options, refer to pages 21 to 23.

4
Direct Operated 2 Port Solenoid Valve Series VX21/22/23

For Air Single Unit

Specifications
Model/Valve Specifications
N.C.

For Air
Symbol

1 2

For Medium
Vacuum
When the valve is closed, flow is blocked from port 1 to port 2. However, if the pressure in port 2 is
higher than port 1, the valve will not be able to block the fluid and it will flow from port 2 to port 1.

AIuminum Body Type

Orifice diameter Flow-rate characteristics Maximum operating Max. system pressure Note)

For Water
Size Port size Model pressure differential Weight
(mmø) C [dm3/(s·bar)] b Cv (MPa) (MPa) (g)
2 0.63 0.63 0.23 1.0 220
1 1/8, 1/4 3 VX210 1.05 0.68 0.41 0.6 220
5 2.20 0.39 0.62 0.2 220
4 1.90 0.52 0.62 1.0 340
2 1/4, 3/8 VX220
7 3.99 0.44 1.08 0.15 1.0 340
5 1.96 0.55 0.75 1.0 450

For Oil
1/4, 3/8 8 5.67 0.33 1.58 0.3 450
3 VX230
10 5.74 0.64 2.21 0.1 450
1/2 10 8.42 0.39 2.21 0.1 470

Resin Body Type (Built-in One-touch Fittings)

Flow-rate characteristics Maximum operating Max. system pressure Note)

For Steam
Orifice diameter Weight
Size Port size Model pressure differential
(mmø) C [dm3/(s·bar)] b Cv (MPa) (MPa) (g)
2 0.82 0.44 0.23 1.0 220
ø6 3 1.25 0.34 0.35 0.6 220
5 1.45 0.43 0.40 0.2 220
1 VX210
2 0.82 0.44 0.23 1.0 220
ø8 3 1.81 0.40 0.41 0.6 220
5 2.11 0.32 0.56 0.2 220
4 1.69 0.40 0.47 1.0 340
ø8
7 3.14 0.34 0.84 0.15 340

Special Options
2 VX220 1.0
4 1.68 0.49 0.50 1.0 340
ø10
7 3.54 0.36 0.90 0.15 340
5 2.50 0.44 0.70 1.0 460
ø10 8 2.77 0.82 1.22 0.3 460
10 5.69 0.46 1.54 0.1 460
3 VX230
5 2.50 0.44 0.70 1.0 460
Construction

ø12 8 2.56 0.88 1.38 0.3 460

10 5.69 0.64 1.76 0.1 460
Note) Weight of grommet type. Add 10 g for conduit type, 30 g for DIN terminal type, 60 g for conduit terminal type respectively.
 Refer to “Glossary of Terms” on page 37 for details on the maximum operating pressure differential.

Fluid and Ambient Temperature Valve Leakage Rate

Dimensions

Internal Leakage
Fluid temperature (°C) Ambient temperature (°C) Seal material Note 2) Leakage rate (Air) Note 1)
−10 Note) to 60 −20 to 60 1 cm3/min or less (AIuminum body type)
NBR (FKM)
Note) Dew point temperature: −10°C or less 15 cm3/min or less (Resin body type)

External Leakage
Seal material Note 2) Leakage rate (Air) Note 1)
1 cm3/min or less (AIuminum body type)
NBR (FKM)
15 cm3/min or less (Resin body type)
Note 1) Leakage is the value at ambient temperature 20°C.
Note 2) For seal material/FKM, refer to “Other Options” on page 21 for the
selection.
5
Series VX21/22/23

For Air Single Unit

Model/Valve Specifications
N.O.
Symbol

1 2

When the valve is closed, flow is blocked from port 1 to port 2. However, if the pressure in port 2 is
higher than port 1, the valve will not be able to block the fluid and it will flow from port 2 to port 1.

AIuminum Body Type

Orifice diameter Flow-rate characteristics Maximum operating Max. system pressure Note)
Size Port size Model pressure differential Weight
(mmø) C [dm3/(s·bar)] b Cv (MPa) (MPa) (g)
2 0.63 0.63 0.23 0.9 240
1 1/8, 1/4 3 VX240 1.05 0.68 0.41 0.45 240
5 2.20 0.39 0.62 0.2 240
4 1.90 0.52 0.62 0.8 1.0 370
2 1/4, 3/8 VX250
7 3.99 0.44 1.08 0.15 370
5 1.96 0.55 0.75 0.8 490
3 1/4, 3/8 VX260
8 5.67 0.33 1.58 0.3 490

Resin Body Type (Built-in One-touch Fittings)

Orifice diameter Flow-rate characteristics Maximum operating Max. system pressure Note)
Size Port size Model pressure differential Weight
(mmø) C [dm3/(s·bar)] b Cv (MPa) (MPa) (g)
2 0.82 0.44 0.23 0.9 240
ø6 3 1.25 0.34 0.35 0.45 240
5 1.45 0.43 0.40 0.2 240
1 VX240
2 0.82 0.44 0.23 0.9 240
ø8 3 1.81 0.40 0.41 0.45 240
5 2.11 0.32 0.56 0.2 240
4 1.69 0.40 0.47 0.8 370
ø8 1.0
7 3.14 0.34 0.84 0.15 370
2 VX250
4 1.68 0.49 0.50 0.8 370
ø10
7 3.54 0.36 0.90 0.15 370
5 2.50 0.44 0.70 0.8 500
ø10
8 2.77 0.82 1.22 0.3 500
3 VX260
5 2.50 0.42 0.70 0.8 500
ø12
8 2.56 0.88 1.38 0.3 500
Note) Weight of grommet type. Add 10 g for conduit type, 30 g for DIN terminal type, 60 g for conduit terminal type respectively.
 Refer to “Glossary of Terms” on page 37 for details on the maximum operating pressure differential.

Fluid and Ambient Temperature Valve Leakage Rate

6
Direct Operated 2 Port Solenoid Valve Series VX21/22/23
For Air Single Unit
® Note) Refer to the table
on page 24 for RoHS
How to Order (Single Unit) UL-compliant.

Specifications
VX2 1 0 A A Common Specifications
Seal material NBR
Coil insulation type Class B
Fluid Thread type Rc∗
0 Air ∗ One-touch fittings are attached
to the resin body type.

Coil size/Valve type Body material/Port size/Orifice diameter Voltage/Electrical entry

For Air
Body Port Orifice
Size Symbol Valve type Symbol Symbol Voltage Electrical entry
material size diameter
A 2 Grommet
1 N.C.
B 1/8 3
Size 1
C 5 A 24 VDC
4 N.O. Aluminum
D 2

For Medium
E

Vacuum
1/4 3
F 5 B 100 VAC Grommet
H 2 With surge
C 110 VAC voltage
J ø6 3
suppressor
K 5
D 200 VAC
Resin

For Water
L (With bracket) 2 E 230 VAC
M ø8 3 F 24 VDC
N 5
G 24 VDC DIN terminal
With surge
A 4 H 100 VAC
2 N.C. 1/4 voltage
B 7
J 110 VAC suppressor
Size 2 Aluminum
D 4
5

For Oil
N.O. 3/8 K 200 VAC
E 7
H 4 L 230 VAC
ø8
J Resin 7 M 24 VDC Conduit terminal
L (With bracket) 4 With surge
ø10 N 100 VAC voltage
M 7
suppressor
P 110 VAC

For Steam
A 5
Q 200 VAC
3 N.C.
B 1/4 8
Size 3 R 230 VAC
C 10 (N.C. only)
6 N.O.
S 24 VDC Conduit
D Aluminum 5
With surge
E 3/8 8 T 100 VAC voltage
F 10 (N.C. only)
U 110 VAC suppressor
G 1/2 10 (N.C. only)
V 200 VAC
H 5
W

Special Options
J ø10 8 230 VAC
K Resin 10 (N.C. only) Flat terminal
L (With bracket) 5
M ø12 8 Y 24 VDC
N 10 (N.C. only)
Construction

Z Other voltages

For special options, refer to pages 21 to 23.

24 VAC Low concentration ozone resistant
48 VAC (Seal material: FKM)
Dimensions

Special voltage 220 VAC Seal material: EPDM

240 VAC Oil-free
12 VDC G thread
DIN terminal with light NPT thread
Conduit terminal with light With bracket (Aluminum body only)
Without DIN connector Mounting holes on the bottom side of the body
(Aluminum body only)
Special electrical entry direction

Dimensions → Pages 28 to 31 (Single unit)

7
Series VX21/22/23

For Air Manifold

∗ For other fluids, please contact SMC.

Model/Valve Specifications
N.C.
Symbol
2 (OUT) 2 (OUT)

1 (IN)

Common SUP type

N.O.
Symbol
2 (OUT) 2 (OUT)

1 (IN)
When the valve is closed, flow is blocked from port 1 to port 2. However,
if the pressure in port 2 is higher than port 1, the valve will not be able to
Common SUP type block the fluid and it will flow from port 2 to port 1.

Normally Closed (N.C.)

Orifice diameter Flow-rate characteristics Maximum operating Max. system pressure
Size Model pressure differential
(mmø) C [dm3/(s·bar)] b Cv (MPa) (MPa)
2 0.63 0.63 0.23 1.0
1 3 VX2A0 1.05 0.68 0.41 0.6
5 2.20 0.39 0.62 0.2
4 1.90 0.52 0.62 1.0 1.0
2 VX2B0
7 3.99 0.44 1.08 0.15
5 1.96 0.55 0.75 1.0
3 VX2C0
7 3.99 0.44 1.08 0.3

Normally Open (N.O.)

Flow-rate characteristics Maximum operating Max. system pressure
Size Orifice diameter Model pressure differential
(mmø) C [dm3/(s·bar)] b Cv (MPa) (MPa)

2 0.63 0.63 0.23 0.9

1 3 VX2D0 1.05 0.68 0.41 0.45
5 2.20 0.39 0.62 0.2
4 1.90 0.52 0.62 0.8 1.0
2 VX2E0
7 3.99 0.44 1.08 0.15
5 1.96 0.55 0.75 0.8
3 VX2F0
7 3.99 0.44 1.08 0.3

Fluid and Ambient Temperature Valve Leakage Rate

Internal Leakage
Fluid temperature (°C) Ambient temperature (°C) Seal material Note 2) Leakage rate Note 1)
−10 Note) to 60 −20 to 60 NBR (FKM) 1 cm3/min or less
Note) Dew point temperature: –10°C or less
External Leakage
Seal material Note 2) Leakage rate Note 1)
NBR (FKM) 1 cm3/min or less
Note 1) Leakage is the value at ambient temperature 20°C.
Note 2) For seal material/FKM, refer to “Other Options” on page 21 for the
selection.

8
Direct Operated 2 Port Solenoid Valve Series VX21/22/23
For Air Manifold

RoHS
How to Order (Solenoid Valve for Manifold)

Specifications
VX2 A 0 A A Common Specifications
Seal material NBR
Fluid Coil insulation type Class B
0 Air

Coil size/Valve type Body material/Orifice diameter Voltage/Electrical entry

Body
Size Symbol Valve type Symbol material Orifice diameter Symbol Voltage Electrical entry

For Air
A N.C. A 2 Grommet
Size 1
D N.O. B Resin 3
C 5 A 24 VDC

B N.C. A 4
Size 2 Resin
E B

For Medium
N.O. 7

Vacuum
B 100 VAC Grommet
C N.C. A 5 C 110 VAC With surge
Size 3 Resin voltage
F N.O. B 7 D 200 VAC suppressor
E 230 VAC
For special options,
refer to pages 21 to 23. F 24 VDC

For Water
24 VAC G 24 VDC DIN terminal
48 VAC
Caution H 100 VAC With surge
Mounting orientation exists voltage
Special voltage 220 VAC J 110 VAC suppressor
240 VAC when mounting valves onto
K 200 VAC
12 VDC manifold base. Refer to page
48 for details. L 230 VAC
DIN terminal with light
M 24 VDC Conduit terminal
Conduit terminal with light
N With surge

For Oil
Without DIN connector 100 VAC
voltage
Seal material: EPDM P 110 VAC suppressor
Low concentration ozone resistant (Seal material: FKM) Q 200 VAC
Oil-free R 230 VAC
Special electrical entry direction S 24 VDC Conduit
T 100 VAC With surge

For Steam
voltage
Manifold Base/How to Order U 110 VAC suppressor
V 200 VAC

VVX2 1 0 A 02 W 230 VAC

Flat terminal
Fluid
0 Air Y 24 VDC

Coil size Base material/Port size/Base type Stations

Base Individual Base Special

Special Options
Size Symbol Symbol material port size type Symbol Stations Symbol Oil-free thread Z Other voltages

Size 1 1 A 1/8 Common 02 2 stations Nil — Rc

Size 2 2 B
Aluminum
1/4 SUP 03 3 stations A — G How to Order Manifold Assembly (Example)
Size 3 3 Common port size: 3/8 04 4 stations B — NPT
(IN port) 05 5 stations D  G Enter the valve and blanking plate to be mounted under the manifold
06 6 stations E  NPT base part number.
Construction

07 7 stations Z  Rc <Example>
08 8 stations VVX210B05………...1
09 9 stations ∗VX2A0AA ………….4
10 10 stations ∗VVX021S-4A-N ……1
“∗” is the symbol for mounting.
Add an “∗” in front of the part numbers for solenoid
Blanking Plate Assembly Part No. valves etc. to be mounted.
Dimensions

For size 1 VVX021S 4A N D side Stations 1 2 3 4 5 U side

For size 2 VVX022S 4A N

For size 3 VVX023S 4A N
When mounting a blanking plate
assembly, if the solenoid valve for
Seal material 5 x Rc1/4
the manifold is ozone resistant,
(Seal material: FKM), please se- N NBR (Individual port)
lect FKM. F FKM
Enter the product’s part number in order, counting the 1st station from the D side
Dimensions → Page 35 (left in the manifold arrangement, when viewing the individual port in front).
9
Series VX21/22/23

For Medium Vacuum (0.1 Pa·abs or more) Single Unit

∗ This valve can also be used with air.
(Refer to the valve specifications for air.)

Model/Valve Specifications
Symbol (Application example) Symbol (Application example)

N.C. N.O.
q Used with w Used with q Used with w Used with
vacuum pressure vacuum pressure

1 2 1 2 1 2 1 2

When the valve is closed, flow is blocked from port 1 to port 2. When the valve is closed, flow is blocked from port 1 to port 2.
However, if the pressure in port 2 is higher than port 1, the valve However, if the pressure in port 2 is higher than port 1, the valve
will not be able to block the fluid and it will flow from port 2 to port 1. will not be able to block the fluid and it will flow from port 2 to port 1.

Normally Closed (N.C.)

Orifice diameter Flow-rate characteristics Operating pressure range Note)
Max. system pressure Weight
Size Port size Model
(mmø) C [dm3/(s·bar)] b Cv q Used with vacuum (Pa·abs) w Used with pressure (MPa·G) (MPa) (g)
2 0.63 0.63 0.23 0 to 1.0 300
1 1/8, 1/4 3 VX214 1.05 0.68 0.41 0 to 0.6 300
5 2.20 0.39 0.62 0 to 0.2 300
4 1.90 0.52 0.62 0.1 to 0 to 1.0 460
2 1/4, 3/8 VX224
7 3.99 0.44 1.08 atmospheric 0 to 0.15 1.0 460
pressure
5 1.96 0.55 0.75 0 to 1.0 580
1/4, 3/8 8 5.67 0.33 1.58 0 to 0.3 580
3 VX234
10 5.74 0.64 2.21 0 to 0.1 580
1/2 10 8.42 0.39 2.21 0 to 0.1 630

Normally Open (N.O.)

Orifice diameter Flow-rate characteristics Operating pressure range Note)
Max. system pressure Weight
Size Port size Model
(mmø) C [dm3/(s·bar)] b Cv q Used with vacuum (Pa·abs) w Used with pressure (MPa·G) (MPa) (g)
2 0.63 0.63 0.23 0 to 0.9 320
1 1/8, 1/4 3 VX244 1.05 0.68 0.41 0 to 0.45 320
5 2.20 0.39 0.62 0.1 to 0 to 0.2 320
4 1.90 0.52 0.62 atmospheric 0 to 0.8 1.0 490
2 1/4, 3/8 VX254 pressure
7 3.99 0.44 1.08 0 to 0.15 490
5 1.96 0.55 0.75 0 to 0.8 620
3 1/4, 3/8 VX264
8 5.67 0.33 1.58 0 to 0.3 620
Note) Weight of grommet type. Add 10 g for conduit type, 30 g for DIN terminal type, 60 g for conduit terminal type respectively.

Fluid and Ambient Temperature Valve Leakage Rate

Internal Leakage
Fluid temperature (°C) Ambient temperature (°C) Seal material Leakage rate Note)
1 to 60 Note) −20 to 60 FKM 10−6 Pa·m3/sec or less
Note) With no freezing
External Leakage
Seal material Leakage rate Note)
FKM 10−6 Pa·m3/sec or less
Note) Leakage (10−6 Pa·m3/sec) is the value at differential pressure 0.1
MPa and ambient temperature 20°C.

10
Direct Operated 2 Port Solenoid Valve Series VX21/22/23
For Medium Vacuum Single Unit

RoHS
How to Order (Single Unit)

Specifications
Common Specifications
VX2 1 4 A A Seal material FKM
Coil insulation type Class B
Thread type Rc
Fluid
Oil-free
4 Medium vacuum
Non-leak

Coil size/Valve type Body material/Port size/Orifice diameter Voltage/Electrical entry

For Air
Body Orifice
Size Symbol Valve type Symbol Port size Symbol Voltage Electrical entry
material diameter
A 2 Grommet
1 N.C.
B 1/8 3
Size 1
C 5 A 24 VDC
4 N.O. C37
D 2

For Medium
E

Vacuum
1/4 3
F 5 B 100 VAC Grommet
H 2 With surge
C 110 VAC
J 1/8 3 voltage
K Stainless 5
D 200 VAC suppressor
steel

For Water
L 2 E 230 VAC
M 1/4 3 F 24 VDC
N 5
G 24 VDC DIN terminal
A 4 With surge
H 100 VAC
2 N.C. 1/4 voltage
B 7
J 110 VAC suppressor
Size 2 C37
D 4
5

For Oil
N.O. 3/8 K 200 VAC
E 7
H 4 L 230 VAC
1/4
J Stainless 7 M 24 VDC Conduit terminal
L steel 4 With surge
3/8 N 100 VAC
M 7 voltage
P 110 VAC suppressor

For Steam
A 5
Q
3 N.C. 200 VAC
B 1/4 8
Size 3 R 230 VAC
C 10 (N.C. only)
6 N.O.
D C37 5 S 24 VDC Conduit
E 3/8 8 With surge
T 100 VAC
voltage
F 10 (N.C. only)
U 110 VAC suppressor
G 1/2 10 (N.C. only)
V 200 VAC
H 5
W

Special Options
J 1/4 8 230 VAC
K 10 (N.C. only) Flat terminal
Stainless
L steel 5
M 3/8 8 Y 24 VDC
N 10 (N.C. only)
P 1/2 10 (N.C. only)
Construction

Z Other voltages

For special options, refer to pages 21 to 23.

24 VAC Without DIN connector
48 VAC Seal material: EPDM
Dimensions

Special voltage 220 VAC G thread

240 VAC NPT thread
12 VDC With bracket
DIN terminal with light Mounting holes on the bottom side of the body
Conduit terminal with light Special electrical entry direction

Dimensions→ Pages 32, 33 (Single unit)

11
Series VX21/22/23

For Medium Vacuum (0.1 Pa·abs or more) Manifold

∗ For other fluids, please contact SMC.

Model/Valve Specifications
N.C.
Symbol
1 (IN) 1 (IN)

2 (OUT)

Individual SUP type

N.O.
Symbol
1 (IN) 1 (IN)

2 (OUT)
When the valve is closed, flow is blocked from port 1 to port 2.
However, if the pressure in port 2 is higher than port 1,
Individual SUP type the valve will not be able to block the fluid and it will flow from port 2 to port 1.

Normally Closed (N.C.)

Orifice diameter Flow-rate characteristics Maximum operating Max. system pressure
Size Model pressure differential
(mmø) C [dm3/(s·bar)] b Cv (MPa) (MPa)

2 0.63 0.63 0.23 1.0

1 3 VX2A4 1.05 0.68 0.41 0.6
5 2.20 0.39 0.62 0.2
4 1.90 0.52 0.62 1.0 1.0
2 VX2B4
7 3.99 0.44 1.08 0.15
5 1.96 0.55 0.75 1.0
3 VX2C4
7 3.99 0.44 1.08 0.3

Normally Open (N.O.)

Flow-rate characteristics Maximum operating Max. system pressure
Size Orifice diameter Model pressure differential
(mmø) C [dm3/(s·bar)] b Cv (MPa) (MPa)

2 0.63 0.63 0.23 0.9

1 3 VX2D4 1.05 0.68 0.41 0.45
5 2.20 0.39 0.62 0.2
4 1.90 0.52 0.62 0.8 1.0
2 VX2E4
7 3.99 0.44 1.08 0.15
5 1.96 0.55 0.75 0.8
3 VX2F4
7 3.99 0.44 1.08 0.3

Fluid and Ambient Temperature Valve Leakage Rate

RoHS
How to Order (Solenoid Valve for Manifold)

Specifications
VX2 A 4 A A Common Specifications
Seal material FKM
Fluid Coil insulation type Class B
4 Medium vacuum Oil-free
Non-leak
Coil size/Valve type Body material/Orifice diameter Voltage/Electrical entry
Body Orifice
Size Symbol Valve type Symbol Symbol Voltage Electrical entry

For Air
material diameter
A N.C. A 2 Grommet
Size 1
D N.O. B Resin 3
C 5 A 24 VDC

B N.C. A 4

For Medium
Size 2 Resin B 100 VAC
E B Grommet

Vacuum
N.O. 7
C 110 VAC With surge
D 200 VAC voltage
C N.C. A 5
suppressor
Size 3 Resin E 230 VAC
F N.O. B 7
F 24 VDC
G

For Water
For special options, 24 VDC DIN terminal
refer to pages 21 to 23. H 100 VAC With surge
24 VAC J voltage
48 VAC
Caution 110 VAC
suppressor
Mounting orientation exists K 200 VAC
Special voltage 220 VAC when mounting valves onto L 230 VAC
240 VAC manifold base. Refer to page M 24 VDC Conduit terminal
12 VDC 48 for details. N 100 VAC With surge

For Oil
DIN terminal with light P 110 VAC voltage
Conduit terminal with light suppressor
Q 200 VAC
Without DIN connector R 230 VAC
Seal material: EPDM S 24 VDC Conduit
Special electrical entry direction T 100 VAC With surge

For Steam
U 110 VAC voltage
Manifold Base/How to Order V 200 VAC
suppressor

W 230 VAC

VVX2 1 4 A 02 Flat terminal

Y 24 VDC
Fluid
4 Medium vacuum
Z Other voltages

Special Options
Coil size Base material/Port size/Base type Stations
Size Symbol
Base Individual Base
Symbol material port size type Symbol Stations
Special
Symbol thread
How to Order Manifold Assembly (Example)
Size 1 1 A 1/8 Individual 02 2 stations Nil Rc Enter the valve and blanking plate to be mounted under the manifold
Aluminum
Size 2 2 B 1/4 SUP 03 3 stations A G base part number.
Size 3 3 Common port size: 3/8 04 4 stations B NPT <Example>
Construction

(OUT port) 05 5 stations VVX214B05……......1

06 6 stations ∗VX2A4AA ………….4
∗VVX021S-4A-F ……1
07 7 stations
“∗” is the symbol for mounting.
08 8 stations Add an “∗” in front of the part numbers for solenoid
09 9 stations valves etc. to be mounted.
10 10 stations
Dimensions

D side Stations 1 2 3 4 5 U side

Blanking Plate Assembly Part No.

For size 1 VVX021S 4A F SMC SMC SMC SMC

For size 2 VVX022S 4A F 5 x Rc1/4

For size 3 VVX023S 4A F (Individual port)
Enter the product’s part number in order, counting the 1st station from the D side
Dimensions → Page 35 (left in the manifold arrangement, when viewing the individual port in front).

13
Series VX21/22/23

For Water Single Unit

∗ This valve can also be used with air.
(Refer to the valve specifications for air.)

Model/Valve Specifications
Symbol Symbol

N.C. N.O.

1 2 1 2

When the valve is closed, flow is blocked from port 1 to port 2. When the valve is closed, flow is blocked from port 1 to port 2.
However, if the pressure in port 2 is higher than port 1, the valve will However, if the pressure in port 2 is higher than port 1, the valve will
not be able to block the fluid and it will flow from port 2 to port 1. not be able to block the fluid and it will flow from port 2 to port 1.

Normally Closed (N.C.)

Normally Open (N.O.)

Orifice diameter Flow-rate characteristics Maximum operating Max. system pressure Note)
Size Port size Model pressure differential Weight
(mmø) AV (x 10−6 m2) Conversion Cv (MPa) (MPa) (g)
2 5.5 0.23 0.9 320
1 1/8, 1/4 3 VX242 10.0 0.42 0.45 320
5 15.0 0.63 0.2 320
4 15.0 0.63 0.8 1.0 490
2 1/4, 3/8 VX252
7 26.0 1.08 0.15 490
5 18.0 0.75 0.8 620
3 1/4, 3/8 VX262
8 38.0 1.58 0.3 620
Note) Weight of grommet type. Add 10 g for conduit type, 30 g for DIN terminal type, 60 g for conduit terminal type respectively.
• Refer to “Glossary of Terms” on page 37 for details on the maximum operating pressure differential.

Fluid and Ambient Temperature Valve Leakage Rate

Internal Leakage
Fluid temperature (°C) Ambient temperature (°C) Seal material Note 2) Leakage rate (Water) Note 1)
1 to 60 Note) −20 to 60 NBR (FKM) 0.1 cm3/min or less
Note) With no freezing External Leakage
Seal material Note 2) Leakage rate (Water) Note 1)
NBR (FKM) 0.1 cm3/min or less
Note 1) Leakage is the value at ambient temperature 20°C.
Note 2) For seal material/FKM, refer to “Other Options” on page 21 for the
selection.

14
Direct Operated 2 Port Solenoid Valve Series VX21/22/23
For Water Single Unit
® Note) Refer to the table
on page 25 for RoHS
How to Order (Single Unit) UL-compliant.

Specifications
VX2 1 2 A A Common Specifications
Seal material NBR
Fluid Coil insulation type Class B
2 Water Thread type Rc

Coil size/Valve type Body material/Port size/Orifice diameter Voltage/Electrical entry

Body Orifice
Size Symbol Valve type Symbol Port size Symbol Voltage Electrical entry

For Air
material diameter
A 2 Grommet
1 N.C.
B 1/8 3
Size 1
C 5 A 24 VDC
4 N.O. C37
D 2
E 1/4 3

For Medium
F

Vacuum
5 B 100 VAC Grommet
H 2 With surge
C 110 VAC
J 1/8 3 voltage
K 5
D 200 VAC suppressor
Stainless
L steel 2 E 230 VAC

For Water
M 1/4 3 F 24 VDC
N 5
G 24 VDC DIN terminal
A 4 With surge
2 N.C. 1/4 H 100 VAC
voltage
B 7
J 110 VAC suppressor
Size 2 C37
D 4
5 N.O. 3/8 K 200 VAC
E 7

For Oil
H 4 L 230 VAC
1/4
J Stainless 7 M 24 VDC Conduit terminal
L steel 4 With surge
3/8 N 100 VAC
M 7 voltage
P 110 VAC suppressor
A 5
Q
3 200 VAC

For Steam
N.C.
B 1/4 8
Size 3 R 230 VAC
C 10 (N.C. only)
6 N.O.
D C37 5 S 24 VDC Conduit
E 3/8 8 With surge
T 100 VAC
voltage
F 10 (N.C. only)
U 110 VAC suppressor
G 1/2 10 (N.C. only)
V 200 VAC
H 5
J 1/4 8 W 230 VAC

Special Options
K 10 (N.C. only) Flat terminal
Stainless
L steel 5
M 3/8 8 Y 24 VDC
N 10 (N.C. only)
P 1/2 10 (N.C. only)
Z Other voltages
Construction

For special options, refer to pages 21 to 23.

24 VAC Applicable to deionized water (Seal material: FKM)
48 VAC Seal material: EPDM
Special voltage 220 VAC Oil-free
Dimensions

240 VAC G thread

12 VDC NPT thread
DIN terminal with light With bracket
Conduit terminal with light Mounting holes on the bottom side of the body
Without DIN connector Special electrical entry direction

Dimensions → Pages 32, 33 (Single unit)

15
Series VX21/22/23

For Oil Single Unit

∗ This valve can also be used with air or water. When the fluid is oil.
(Refer to the valve specifications for air or water.) The kinematic viscosity must not exceed 50 mm2/s.
The special construction of the armature adopted in the built-in
full-wave rectifier type gives an improvement in OFF response by
providing clearance on the absorbed surface when it is switched ON.
Model/Valve Specifications
Symbol Symbol

N.C. N.O.

1 2 1 2

When the valve is closed, flow is blocked from port 1 to port 2. When the valve is closed, flow is blocked from port 1 to port 2.
However, if the pressure in port 2 is higher than port 1, the valve will However, if the pressure in port 2 is higher than port 1, the valve will
not be able to block the fluid and it will flow from port 2 to port 1. not be able to block the fluid and it will flow from port 2 to port 1.

Normally Closed (N.C.)

Normally Open (N.O.)

Orifice diameter Flow-rate characteristics Maximum operating Max. system pressure
Note)
Size Port size Model pressure differential Weight
(mmø) −6
AV (x 10 m ) 2
Conversion Cv (MPa) (MPa) (g)
2 5.5 0.23 0.9 320
1 1/8, 1/4 3 VX243 10.0 0.42 0.45 320
5 15.0 0.63 0.2 320
4 15.0 0.63 0.8 1.0 490
2 1/4, 3/8 VX253
7 26.0 1.08 0.15 490
5 18.0 0.75 0.8 620
3 1/4, 3/8 VX263
8 38.0 1.58 0.3 620
Note) Weight of grommet type. Add 10 g for conduit type, 30 g for DIN terminal type, 60 g for conduit terminal type respectively.
• Refer to “Glossary of Terms” on page 37 for details on the maximum operating pressure differential.

Fluid and Ambient Temperature Valve Leakage Rate

Internal Leakage
Fluid temperature (°C) Ambient temperature (°C) Seal material Leakage rate (Oil) Note)
−5 Note) to 60 −20 to 60 FKM 0.1 cm3/min or less
Note) Kinematic viscosity: 50 mm2/s or less
External Leakage
Seal material Leakage rate (Oil) Note)
FKM 0.1 cm3/min or less
Note) Leakage is the value at ambient temperature 20°C.

16
Direct Operated 2 Port Solenoid Valve Series VX21/22/23
For Oil Single Unit

RoHS
How to Order

Specifications
VX2 1 3 A A Common Specifications
Seal material FKM
Fluid Coil insulation type Class B
3 Oil Thread type Rc

Coil size/Valve type Body material/Port size/Orifice diameter Voltage/Electrical entry

Body Orifice
Size Symbol Valve type Symbol Port size Symbol Voltage Electrical entry

For Air
material diameter
A 2 Grommet
1 N.C.
B 1/8 3
Size 1
C 5 A 24 VDC
4 N.O. C37
D 2
E 1/4 3

For Medium
F

Vacuum
5 B 100 VAC Grommet
H 2 With surge
C 110 VAC
J 1/8 3 voltage
K 5
D 200 VAC suppressor
Stainless
L steel 2 E 230 VAC

For Water
M 1/4 3 F 24 VDC
N 5
G 24 VDC DIN terminal
A 4 With surge
2 N.C. 1/4 H 100 VAC
voltage
B 7
J 110 VAC suppressor
Size 2 C37
D 4
5 N.O. 3/8 K 200 VAC
E 7

For Oil
H 4 L 230 VAC
1/4
J Stainless 7 M 24 VDC Conduit terminal
L steel 4 With surge
3/8 N 100 VAC
M 7 voltage
P 110 VAC suppressor
A 5
Q
3 200 VAC

For Steam
N.C.
B 1/4 8
Size 3 R 230 VAC
C 10 (N.C. only)
6 N.O.
D C37 5 S 24 VDC Conduit
E 3/8 With surge
8 T 100 VAC
voltage
F 10 (N.C. only)
U 110 VAC suppressor
G 1/2 10 (N.C. only)
V 200 VAC
H 5
J 1/4 8 W 230 VAC

Special Options
K 10 (N.C. only) Flat terminal
Stainless
L steel 5
M 3/8 8 Y 24 VDC
N 10 (N.C. only)
P 1/2 10 (N.C. only)
Z Other voltages
Construction

For special options, refer to pages 21 to 23.

24 VAC Without DIN connector
48 VAC Oil-free
Special voltage 220 VAC G thread
Dimensions

240 VAC NPT thread

12 VDC With bracket
DIN terminal with light Mounting holes on the bottom side of the body
Conduit terminal with light Special electrical entry direction

Dimensions → Pages 32, 33 (Single unit)

17
Series VX21/22/23

For Steam Single Unit

∗ This valve can also be used with air, water, oil or heated water.
(Refer to the valve specifications for air, water or oil.)

Model/Valve Specifications
Symbol Symbol

N.C. N.O.

1 2 1 2

When the valve is closed, flow is blocked from port 1 to port 2.

However, if the pressure in port 2 is higher than port 1,
the valve will not be able to block the fluid and it will flow from port 2 to port 1.

Normally Closed (N.C.)

Normally Open (N.O.)

Orifice diameter Flow-rate characteristics Maximum operating Max. system pressure Note)
Size Port size Model pressure differential Weight
(mmø) −6
AV (x 10 m ) 2
Conversion Cv (MPa) (MPa) (g)
2 5.5 0.23 0.9 320
1 1/8, 1/4 3 VX245 10.0 0.42 0.45 320
5 15.0 0.63 0.2 320
4 15.0 0.63 0.8 1.0 490
2 1/4, 3/8 VX255
7 26.0 1.08 0.15 490
5 18.0 0.75 0.8 620
3 1/4, 3/8 VX265
8 38.0 1.58 0.3 620
Note) Weight of grommet type. Add 10 g for conduit type, 60 g for conduit terminal type respectively.

Fluid and Ambient Temperature Valve Leakage Rate

Internal Leakage
Fluid temperature (°C) Ambient temperature (°C) Fluid Seal material Leakage rate
Steam: 183 or less Steam 1.0 cm3/min or less
−20 to 60 FKM for high temperature
Heated water: 99 or less Heated water 0.1 cm3/min or less

External Leakage
Fluid Seal material Leakage rate
Steam 1.0 cm3/min or less
FKM for high temperature
Heated water 0.1 cm3/min or less

18
Direct Operated 2 Port Solenoid Valve Series VX21/22/23
For Steam Single Unit

RoHS
How to Order (Single Unit)

Specifications
VX2 1 5 A B Common Specifications
Seal material FKM for high temperature
Coil insulation type Class H
Fluid
Thread type Rc
5 Steam
∗ Can be used with heated water.

For Air
Coil size/Valve type Body material/Port size/Orifice diameter Voltage/Electrical entry
Body Orifice
Size Symbol Valve type Symbol Port size Symbol Voltage Electrical entry Note 3)
material diameter
A 2 Grommet
1 N.C.
B 1/8 3
Size 1
C 5 A 24 VDC
4

For Medium
N.O. C37
D 2

Vacuum
E 1/4 3
F 5 B 100 VAC Grommet
H 2 With surge
C 110 VAC voltage
J 1/8 3 suppressor
D 200 VAC

For Water
K Stainless 5
L steel 2 E 230 VAC
M 1/4 3 G 24 VDC DIN terminal
N 5 With surge voltage
H 100 VAC suppressor Note 1) 2)
A 4 J 110 VAC
2 N.C. 1/4
B 7
K 200 VAC
Size 2 C37

For Oil
D 4
5 N.O. 3/8 L 230 VAC
E 7
H 4 N 100 VAC Conduit terminal
1/4 With surge
J Stainless 7 P 110 VAC voltage
L steel 4 suppressor
3/8 Q 200 VAC
M 7

For Steam
R 230 VAC
A 5
T Conduit
3 N.C. 100 VAC
B 1/4 8 With surge
Size 3 U 110 VAC voltage
C 10 (Only N.C.)
6 N.O. suppressor
D C37 5 V 200 VAC
E 3/8 8 W 230 VAC
F 10 (Only N.C.)
Z Other voltages
G 1/2 10 (Only N.C.)
Note 1) AC voltage coil for “H” of DIN terminal type does not

Special Options
H 5
have full-wave rectifier. Full-wave rectifier is built on the
J 1/4 8 DIN connector side. Refer to page 36 to order it as an
K 10 (Only N.C.) accessory.
Stainless Note 2) DIN connector insulation class is Class “B”.
L steel 5
Note 3) Flat terminal is not available.
M 3/8 8
N 10 (Only N.C.)
Construction

P 1/2 10 (Only N.C.)

For special options, refer to pages 21 to 23.
24 VAC
48 VAC
Special voltage
220 VAC
240 VAC
Dimensions

DIN terminal with light

Conduit terminal with light
Seal material: EPDM
Oil-free
G thread
NPT thread
With bracket
Mounting holes on the bottom side of the body
Special electrical entry direction
Dimensions → Page 34 (Single unit)

19
20
Series VX21/22/23
Special Options
Electrical Options

Specifications
Other Options
(Special voltage, With light, Without DIN connector)

VX2 1 0 A Z 1A Low concentration ozone resistant and applicable to deionized water

Oil-free
Enter standard product Port thread
number. Electrical option
VX2 1 0 A A Z

For Air
Electrical specification/Voltage/Electrical entry
Specification Symbol Class H∗ Voltage Electrical entry
1A  48 VAC
1B  220 VAC Grommet Enter standard product
1C  240 VAC (With surge voltage suppressor)
number.
1U  24 VAC
1D — 12 VDC Grommet Other option

For Medium
Grommet Low concentration ozone resistant and applicable to deionized water/

Vacuum
1E — 12 VDC
(With surge voltage suppressor) Oil-free/Port thread
1F  48 VAC Low concentration ozone resistant and applicable
Symbol Oil-free Port thread
1G  220 VAC
DIN terminal to deionized water∗1 (Seal material: FKM)
Special voltage

1H  240 VAC
(With surge voltage suppressor) Nil — Rc, One-touch fitting∗2
—
1V  24 VAC A G
1J — —

For Water
— 12 VDC B NPT
1K  48 VAC C  — Rc, One-touch fitting∗2
1L  220 VAC D G
Conduit terminal — 
1M  240 VAC
(With surge voltage suppressor) E NPT
1W  24 VAC F G
1N — 12 VDC  —
G NPT
1P  48 VAC H Rc, One-touch fitting∗2
1Q  220 VAC K   G
Conduit

For Oil
1R  240 VAC
(With surge voltage suppressor) L NPT
1Y  24 VAC Z —  Rc, One-touch fitting∗2
1S — 12 VDC ∗1 Applicable to air (VX20) and water (VX22).
1T — 12 VDC Flat terminal ∗2 When the body is resin, One-touch fittings are equipped.
2A  24 VDC
2B  100 VAC
Made to Order

For Steam
2C  110 VAC
2D  200 VAC
<Special lead wire length>
2E  230 VAC DIN terminal
2F  48 VAC (With surge voltage suppressor) Produced upon receipt of order. Please contact SMC for lead times.
2G 220 VAC
VX2 XL

2H  240 VAC
2V  24 VAC
With light

2J — 12 VDC
2K — 24 VDC Lead wire
2L  100 VAC
length
2M 110 VAC XL1 600 mm

Special Options

2N  200 VAC XL2 1000 mm
2P  230 VAC Conduit terminal XL3 1500 mm
2Q  48 VAC (With surge voltage suppressor) XL4 3000 mm
2R  220 VAC
<High pressure>
2S
VX2 XH
 240 VAC
2W  24 VAC
2T — 12 VDC
Construction

— 3A
24 VDC Correspondence table Option
Without DIN connector

— 3B
100 VAC
Size Symbol
Body Port Orifice Max. operating Specifications
— 3C
110 VAC material size dia. pressure differential Symbol Electrical
Bracket
— 3D
200 VAC Q 1/8 entry direction
C37
— 3E
230 VAC DIN terminal R 1/4 In side
N.C. 2 2 MPa Nil (Standard)
— 3F
48 VAC (With surge voltage suppressor) 1 S
Stainless steel
1/8
3G A 90° None
Dimensions

— 220 VAC T 1/4

— 3H
240 VAC N.O. — — Not available B 180°
— 3V
24 VAC Q 1/4 C 270°
C37 3 2 MPa
— 3J
12 VDC N.C. R 3/8 In side
2 D (Standard)
∗ Options marked with  are available for Class “H” coil. — Stainless steel Not available
With
Applicable for all when the coil insulation class is Class “B”. N.O. — — Not available E 90°
bracket
Q 1/4 F 180°
C37 3 3 MPa
∗ Enter symbols in the order below when ordering a combination of N.C. R 3/8 G 270°
3
electrical option, other option, etc. — Stainless steel Not available In side Mounting
H (Standard)
N.O. — — Not available holes on
Example) VX2 1 2 A Z 1A Z ∗ The aluminum and PBT bodies are not J 90° the bottom
available. K 180° side of
Electrical option Other option L 270° the body
21 A
Series VX21/22/23

Installation Options
(Mounting Option/Special Electrical Entry Direction)
The following shows combinations that can be selected using installation options.
Combinations

Symbol Special electrical entry direction With bracket Mounting holes on the bottom side of the body Seal material: EPDM
XC
XB
XNB
X332

With Bracket/
Special Electrical Entry Direction Special Electrical Entry Direction

VX2 XC A VX2 XB A
Enter standard product Enter standard product
number. number.
With bracket/Special
Special electrical entry direction electrical entry direction
Electrical entry direction Symbol Electrical entry direction Symbol Electrical entry direction
Symbol
Single unit Manifold Standard
IN OUT
90°
90°
90° Nil

IN OUT 270°
A 90° 90° 270°

A IN OUT
90° Individual port IN OUT C

180° 180°
180° 180° 180°
IN OUT B
B 180° IN OUT

Individual port
(mm)
270° 270° Size Port size U W X
270°
1 1/8, 1/4 46 36 11
W
U

IN OUT 2 1/4, 3/8 56 46 13

C 270° 1/4, 3/8 56 46 13
3
1/2 — — —
Individual port X
∗1 Bracket is attached as standard with the resin body, so there are no XB settings.
∗ Enter symbols in the order below when ordering a combination of ∗2 When the orifice is ø8, ø10, and the body port size is 1/4 or 3/8, use a foot
electrical option, other option and special electrical entry direction. type bracket. (The L-bracket of the old VX series is not compatible.) If the
body port size is 1/2, there are no XB settings. (Refer to the following.)
Example) VX2 1 2 A Z 1A Z XC A ∗3 On the bottom side of the standard body, there is no female thread for mounting
a bracket. Please be careful because the bracket cannot be retrofit.
Electrical option Special electrical ∗4 Bracket is packed in the same container as the main body.
Other option entry direction
Bracket Interchangeable with an Old Type
Size Port size Orifice diameter (mmø) Bracket interchangeable with an old type
2  (Interchangeable)
1 1/8, 1/4 3  (Interchangeable)
5  (Interchangeable)
4  (Interchangeable)
2 1/4, 3/8
7  (Interchangeable)
5  (Interchangeable)
∗ Enter symbols in the order below when ordering a combination of
1/4, 3/8 8  (Not interchangeable)∗2
electrical option, other option and with bracket. 3
10  (Not interchangeable)∗2
Example) VX2 1 2 A Z 1A Z XB A 1/2 10 — (Not available)∗2

Electrical option With bracket/Special

Other option electrical entry direction

22
Special Options Series VX21/22/23

Installation Options

Specifications
(Mounting Option/Special Electrical Entry Direction)
Seal Material: EPDM/With Bracket/
Mounting Holes on the Bottom Side of the Body/ Mounting Holes on the Bottom Side of the Body/
Special Electrical Entry Direction Special Electrical Entry Direction

VX2 XNB A VX2 X332 A

For Air
Enter standard product Enter standard product Seal material:
number. number. EPDM
When the fluid is oil, enter the part
number for water (VX22).
Mounting holes on the bottom side of the body/

For Medium
Special electrical entry direction ∗ VX2 3  VX2 2

Vacuum
Symbol Electrical entry direction Symbol Electrical entry direction Refer to page 15 for model selection.
Standard
IN OUT
Nil With bracket/Mounting holes on the bottom side of the body/
Special electrical entry direction

For Water
90° 90° 270° Specifications
270° Symbol
Electrical entry direction Bracket
A IN OUT C Nil IN side (Standard)
IN OUT
A 90°
None
B 180°
C 270°
180° 180° D IN side (Standard)
B E 90°

For Oil
IN OUT With bracket∗1, 2
F 180°
G 270°
H IN side (Standard)
(mm) J 90° Mounting holes on the
Size Port size M D P K 180° bottom side of the body∗1
1 1/8, 1/4 M4 6 12.8 L 270°
P

For Steam
2 1/4, 3/8 M5 8 19 ∗1 Resin body is not available.
1/4, 3/8 M5 8 19 ∗2 The model with bracket is not available for port size 1/2.
2 x M thread 3 ∗3 “Other Options”, which can be combined, are A, B, D, E, Z.
1/2 M5 8 23
Depth D ∗4 Electrical entry direction
Note) Resin body is not available.
Standard 90°

∗ Enter symbols in the order below when ordering a combination of IN OUT IN OUT
electrical option, other option and mounting holes on the bottom
side of the body.
180° 270°
Example) VX2 1 2 A Z 1A Z XNB A

Special Options
IN OUT IN OUT
Electrical option Mounting holes on the
Other option bottom side of the body/
Special electrical entry
direction
∗ Enter symbols in the order below when ordering a combination
Construction

of electrical option, other option, seal material: EPDM, with

bracket, mounting holes on the bottom side of the body and spe-
cial electrical entry direction.

Example) VX2 1 2 A Z 1A Z X332 A

Electrical option Seal material: EPDM/
Other option With bracket/Mounting holes
Dimensions

on the bottom side of the body/

Special electrical entry direction

23 A
Series VX21/22/23
UL-compliant
∗ Refer to the table shown below for UL-compliant.

For Air
VX210 Valve type: N.C. VX220 Valve type: N.C. VX230 Valve type: N.C.
Size, Body Voltage, Size, Body Voltage, Size, Body Voltage,
Other With Note) Other With Note) Other With Note)
Valve type, material, Electrical entry, Valve type, material, Electrical entry, Valve type, material, Electrical entry,
Port options bracket Port options bracket Port options bracket
Fluid size Electrical options Fluid size Electrical options Fluid size Electrical options
VX210 A A Nil Nil VX220 A A Nil Nil VX230 A A Nil Nil
B B A XB B B A XB B B A XB
C C B D C B C C B
D D C E D C D D C
E E D H Note) E D E E D
F F E J Note) F E F F E
H Note) M F L Note) M F G Note 1) M F
J Note) N G M Note) N G H Note 2) N G
K Note) P H P H J Note 2) P H
L Note) Q K Q K K Note 2) Q K
M Note) R L R L L Note 2) R L
N Note) S Z S Z M Note 2) S Z
T Note) Body material/
T Note) Body material/
N Note 2) T Note 1) Body
U Port size: Since U Port size: Since U material/Port
V the bracket is V the bracket is V size: Since “with
W attached to H, J, W attached to H, J, W bracket” setting
K, L, M and N, L and M, “XB” is not provided
Y “XB” cannot be Y cannot be Y on G, “XB”
Z1A selected. Z1A selected. Z1A cannot be
Z1B Z1B Z1B selected.
Z1C Z1C Z1C Note 2) Body
material/Port
Z1U Z1U Z1U size: Since the
Z1D Z1D Z1D bracket is
Z1E Z1E Z1E attached to H, J,
K, L, M and N,
Z1K Z1K Z1K
“XB” cannot be
Z1L Z1L Z1L selected.
Z1M Z1M Z1M
Z1W Z1W Z1W
Z1N Z1N Z1N
Z1P Z1P Z1P
Z1Q Z1Q Z1Q
Z1R Z1R Z1R
Z1Y Z1Y Z1Y
Z1S Z1S Z1S
Z1T Z1T Z1T
Z2K Z2K Z2K
Z2L Z2L Z2L
Z2M Z2M Z2M
Z2N Z2N Z2N
Z2P Z2P Z2P
Z2Q Z2Q Z2Q
Z2R Z2R Z2R
Z2S Z2S Z2S
Z2W Z2W Z2W
Z2T Z2T Z2T
Z3A Z3A Z3A
Z3B Z3B Z3B
Z3C Z3C Z3C
Z3D Z3D Z3D
Z3E Z3E Z3E
Z3F Z3F Z3F
Z3G Z3G Z3G
Z3H Z3H Z3H
Z3V Z3V Z3V
Z3J Z3J Z3J

Refer to pages 21 to 23 for electrical options, other options, and bracket/electrical entry direction.
A 24
UL-compliant Series VX21/22/23

Specifications
For Water
VX212 Valve type: N.C. VX222 Valve type: N.C. VX232 Valve type: N.C.
Size, Body Voltage, Size, Body Voltage, Size, Body Voltage,
Other With Other With Other With
Valve type, material, Electrical entry, Valve type, material, Electrical entry, Valve type, material, Electrical entry,
Port options bracket Port options bracket Port options bracket
Fluid size Electrical options Fluid size Electrical options Fluid size Electrical options
VX212 A A Nil Nil VX222 A A Nil Nil VX232 A A Nil Nil
B B A XB B B A XB B B A XB
C C B D C B C C B

For Air
D D C E D C D D C
E E D H E D E E D
F F E J F E F F E
H M F L M F G Note) M F
J N G M N G H N G
K P H P H J P H

For Medium
Vacuum
L Q K Q K K Q K
M R L R L L R L
N S Z S Z M S Z
T T N T Note) Body material/
U U P Note) U Port size: Since

For Water
V V V “with bracket”
W W W setting is not
provided on G
Y Y Y and P, “XB”
Z1A Z1A Z1A cannot be
Z1B Z1B Z1B selected.
Z1C Z1C Z1C

For Oil
Z1U Z1U Z1U
Z1D Z1D Z1D
Z1E Z1E Z1E
Z1K Z1K Z1K
Z1L Z1L Z1L
Z1M Z1M Z1M

For Steam
Z1W Z1W Z1W
Z1N Z1N Z1N
Z1P Z1P Z1P
Z1Q Z1Q Z1Q
Z1R Z1R Z1R
Z1Y Z1Y Z1Y
Z1S Z1S Z1S
Z1T Z1T Z1T

Special Options
Z2K Z2K Z2K
Z2L Z2L Z2L
Z2M Z2M Z2M
Z2N Z2N Z2N
Z2P Z2P Z2P
Z2Q Z2Q Z2Q
Construction

Z2R Z2R Z2R

Z2S Z2S Z2S
Z2W Z2W Z2W
Z2T Z2T Z2T
Z3A Z3A Z3A
Z3B Z3B Z3B
Dimensions

Z3C Z3C Z3C

Z3D Z3D Z3D
Z3E Z3E Z3E
Z3F Z3F Z3F
Z3G Z3G Z3G
Z3H Z3H Z3H
Z3V Z3V Z3V
Z3J Z3J Z3J

Refer to pages 21 to 23 for electrical options, other options, and bracket/electrical entry direction.

25 A
Series VX21/22/23

Construction/Single Unit
Normally Closed (N.C.)
Body material: AIuminum, C37, Stainless steel Body material: Resin
q q

w w

r r

e e

t t

y y

IN OUT IN OUT

u u
Component Parts Component Parts
No. Description Material No. Description Material
1 Solenoid coil Cu + Fe + Resin 1 Solenoid coil Cu + Fe + Resin
2 Core Fe 2 Core Fe
3 Tube Stainless steel 3 Tube Stainless steel
4 Spring Stainless steel 4 Spring Stainless steel
5 Armature assembly NBR, FKM, Stainless steel, PPS 5 Armature assembly NBR, FKM, Stainless steel, PPS
6 Seal NBR, FKM 6 Seal NBR, FKM
7 Body Aluminum, C37, Stainless steel 7 Body Resin (PBT)

Normally Open (N.O.)

Body material: AIuminum, C37, Stainless steel Body material: Resin

q t q t
w y w y
e u e u
r i r i

IN OUT IN OUT

o o
Component Parts Component Parts
No. Description Material No. Description Material
1 Solenoid coil Cu + Fe + Resin 1 Solenoid coil Cu + Fe + Resin
2 Sleeve assembly Stainless steel, Resin (PPS) 2 Sleeve assembly Stainless steel, Resin (PPS)
3 Push rod assembly Resin (PPS), Stainless steel, NBR, FKM 3 Push rod assembly Resin (PPS), Stainless steel, NBR, FKM
4 Spring Stainless steel 4 Spring Stainless steel
5 O-ring A NBR, FKM 5 O-ring A NBR, FKM
6 O-ring B NBR, FKM 6 O-ring B NBR, FKM
7 Adapter Resin (PPS) 7 Adapter Resin (PPS)
8 O-ring C NBR, FKM 8 O-ring C NBR, FKM
9 Body Aluminum, C37, Stainless steel 9 Body Resin (PBT)
A 26
Direct Operated 2 Port Solenoid Valve Series VX21/22/23

Construction/Manifold

Specifications
Normally Closed (N.C.) Common SUP type (for air) Individual SUP type (for medium vacuum)
Base material: Aluminum
q q
w w
e e
r r

For Air
t t
y y
u u

For Medium
i i

Vacuum
OUT IN
o o

IN port OUT port

For Water
Component Parts
No. Description Material
1 Solenoid coil Cu + Fe + Resin
2 Core Fe
3 Tube Stainless steel
4 Spring Stainless steel

For Oil
5 Armature assembly NBR, FKM, Stainless steel, PPS
6 Seal NBR, FKM
7 Body Resin (PPS)
8 Gasket NBR, FKM
9 Base Aluminum

For Steam
Normally Open (N.O.)
Base material: Aluminum Common SUP type (for air) Individual SUP type (for medium vacuum)

q q
Special Options
t t
w y w y
e u e u
r i r i
Construction

o o
!0 !0
OUT !1 IN !1
Dimensions

IN port OUT port

Component Parts
No. Description Material No. Description Material
1 Solenoid coil Cu + Fe + Resin 7 Adapter Resin (PPS)
2 Sleeve assembly Stainless steel, Resin (PPS) 8 O-ring C NBR, FKM
3 Push rod assembly Resin (PPS), Stainless steel, NBR, FKM 9 Body Resin (PPS)
4 Spring Stainless steel 10 Gasket NBR, FKM
5 O-ring A NBR, FKM 11 Base Aluminum
6 O-ring B NBR, FKM
27 A
Series VX21/22/23
For Air

Dimensions/Body Material: Aluminum

Grommet Grommet (with surge voltage suppressor)
D ≈ 300 Q F D ≈ 300 Q F
R
C

C
R
(1.5)

(1.5)
E

E
Y

Y
2xP A B1 2xP A B1
Port size B Port size B

W
M

M
U

U
2 x ø5.3 X 2 x ø5.3 X
Mounting hole Mounting hole

DIN terminal Conduit terminal

Cable ø6 to ø12 Q F
D S Q±2 F
G1/2 S±2
(44)
31.5

32
25
T
C

C
R
R

G1/2
(1.5)
(1.5)

E
Y

2xP A B1 2xP A B1
Port size B Port size B
W

W
M

M
U

2 x ø5.3 X 2 x ø5.3 X
Mounting hole Mounting hole

(mm)
Port size Mounting bracket dimensions
Size
P A B B1 C D E F
M U W X Y
1 1/8, 1/4 19 43 21 61 (67) 30 9.5 20 12.8 46 36 11 6
2 1/4, 3/8 24 45 22.5 76 (84) 35 12 22 19 56 46 13 7
1/4, 3/8 24 45 22.5 81 (89) 40 12 24.5 19 56 46 13 7
3
1/2 30 50 25 86.5 40 15 24.5 — — — — —

Electrical entry
Port size Grommet
Size Grommet DIN terminal Conduit terminal
P (with surge voltage suppressor)
Q R Q R Q R S Q R S T
1 1/8, 1/4 27 42 (47.5) 30 28.5 (34) 64.5 34 (39.5) 52.5 99.5 36 (41.5) 68.5 77 (83)
2 1/4, 3/8 29.5 53.5 (61.5) 32.5 39.5 (47.5) 67 45 (53) 55 102 47 (55) 71 91 (99)
1/4, 3/8 32 58 (66) 35 44.5 (52.5) 69.5 50 (58) 57.5 104.5 52 (60) 73.5 96 (104)
3
1/2 32 61 35 47.5 69.5 53 57.5 104.5 55 73.5 101.5
( ): Denotes the Normally Open (N.O.) dimensions.
28
Direct Operated 2 Port Solenoid Valve Series VX21/22/23
Air

Dimensions/Body Material: Aluminum

Specifications
Conduit Flat terminal type
≈ 280 Q F 11 Q F
G1/2

R
C

C
R

For Air
(1.5)
(1.5)

E
Y

Y
A B1 A B1
2xP 2xP
B B
Port size Port size

For Medium
Vacuum
Terminal part
W

W
M

M
U

U
Flat terminal connector
250 Series
2 x ø5.3 X 2 x ø5.3 X

For Water
11
Mounting hole 9 Mounting hole

6.5
15

For Oil
For Steam
Special Options
Construction

(mm)
Port size Mounting bracket dimensions
Size A B B1 C D E F
P M U W X Y
1 1/8, 1/4 19 43 21 61 (67) 30 9.5 20 12.8 46 36 11 6
Dimensions

2 1/4, 3/8 24 45 22.5 76 (84) 35 12 22 19 56 46 13 7

1/4, 3/8 24 45 22.5 81 (89) 40 12 24.5 19 56 46 13 7
3
1/2 30 50 25 86.5 40 15 24.5 — — — — —

Electrical entry
Port size
Size Conduit Flat terminal type
P
Q R Q R
1 1/8, 1/4 47.5 36 (41.5) 23 42 (47.5)
2 1/4, 3/8 50 47 (55) 25.5 53.5 (61.5)
1/4, 3/8 52.5 52 (60) 28 58 (66)
3
1/2 52.5 55 28 61
( ): Denotes the Normally Open (N.O.) dimensions.
29
Series VX21/22/23
For Air

Dimensions/Body Material: Resin

Y Y
Grommet W
Grommet (with surge W
voltage suppressor)

U
U

X
X

U1
U1

X1
X1
D ≈ 300 Q F 2 x ø3.4 D ≈ 300 Q F 2 x ø3.4
Mounting Mounting
hole hole
R

C
C

R
1.2

1.2

E
E

2xP B1 2xP B1
Port size B Port size B

DIN terminal Y Conduit terminal Y

W W
U

U
X

X
U1

U1
X1

X1
Cable ø6 to ø12
Q F 2 x ø3.4 2 x ø3.4
D S Mounting D Mounting
G1/2 hole 34 Q±2 F hole
(44)
31.5

32
25
T
C

C
R
R

G1/2
1.2

1.2
E

S±2
2xP B1 2xP B1
Port size B Port size B

(mm)
One-touch Mounting bracket dimensions
Size B B1 C D E F
fitting P U U1 W X X1 Y
For information on handling 1 ø6, ø8 53.5 29 65.5 (71.5) 30 13.5 20 45 22.5 22 52 26 30
One-touch fittings and 2 ø8, ø10 66 36 76.5 (84.5) 35 15 22 53 26.5 27 62 31 35
3 ø10, ø12 68 37 84 (92) 40 16.5 24.5 58 29 31 67 33.5 40
appropriate tubing, refer to
page 48 and KQ2 series Electrical entry
One-touch fittings in Best One-touch Grommet (with surge
Size Grommet DIN terminal Conduit terminal
Pneumatics No. 6. fitting P voltage suppressor)
Q R Q R Q R S Q R S T
The KQ2 series information
1 ø6, ø8 27 42.5 (48) 30 29 (34.5) 64.5 34.5 (40) 52.5 99.5 36.5 (42) 68.5 81.5 (87)
can be downloaded from the 2 ø8, ø10 29.5 51 (59) 32.5 37 (45) 67 43 (50.5) 55 102 45 (52.5) 71 91.5 (99.5)
following SMC website, 3 ø10, ø12 32 56.5 (64.5) 35 43 (51) 69.5 48.5 (56.5) 57.5 104.5 50.5 (58.5) 73.5 98.5 (106.5)
http://www.smcworld.com ( ): Denotes the Normally Open (N.O.) dimensions.
30
Direct Operated 2 Port Solenoid Valve Series VX21/22/23
Air

Dimensions/Body Material: Resin

Specifications
Conduit Flat terminal
Y Y
W W

U
X

X
U1

U1
X1

For Air
2 x ø3.4 2 x ø3.4
Mounting Mounting
D ≈ 280 Q F hole D 11 Q F hole
G1/2
23

For Medium
Vacuum
R
C

C
R
1.2

1.2
E

E
2xP B1 2xP B1

For Water
Port size B Port size B

Terminal part
Flat terminal connector
250 Series

For Oil
11
9
6.5

For Steam
15

(mm)
Electrical entry
One-touch Mounting bracket dimensions

Special Options
Size
fitting P
B B1 C D E F Conduit Flat terminal
U U1 W X X1 Y Q R Q R
1 ø6, ø8 53.5 29 65.5 (71.5) 30 13.5 20 45 22.5 22 52 26 30 47.5 36.5 (42) 23 42.5 (48)
2 ø8, ø10 66 36 76.5 (84.5) 35 15 22 53 26.5 27 62 31 35 50 45 (52.5) 25.5 51 (59)
3 ø10, ø12 68 37 84 (92) 40 16.5 24.5 58 29 31 67 33.5 40 52.5 50.5 (58.5) 28 56.5 (64.5)
( ): Denotes the Normally Open (N.O.) dimensions.
Construction
Dimensions

31
Series VX21/22/23
For Medium Vacuum, Water, Oil

Dimensions/Body Material: C37, Stainless Steel

Grommet Grommet (with surge voltage suppressor)

D ≈ 300 Q F D ≈ 300 Q F

C
C
R

R
1.5
1.5

E
E

A B1 A B1
Y

Y
2xP B 2xP B
Port size Port size

W
M
W

U
M

2 x ø5.3 X 2 x ø5.3 X
Mounting Mounting
hole hole

DIN terminal Conduit terminal

D Cable ø6 to ø12 Q F
S D
G1/2
34 Q±2 F
(44)
31.5

32
25
T
C

C
R

R
1.5

1.5

S±2
E

A B1 A
E
Y

2xP B 2xP B1
Port size Port size B
W
M

W
M

2 x ø5.3 X 2 x ø5.3 X
Mounting Mounting
hole hole

(mm)
Port size Mounting bracket dimensions
Size
P A B B1 C D E F
M U W X Y
1 1/8, 1/4 19 43 21 61 (67) 30 9.5 20 12.8 46 36 11 6
2 1/4, 3/8 22 45 22.5 74.5 (82.5) 35 10.5 22 19 56 46 13 7
1/4, 3/8 22 45 22.5 79 (87) 40 10.5 24.5 19 56 46 13 7
3 — — — — —
1/2 29.5 50 25 85.5 40 14 24.5
Electrical entry
Port size Grommet (with surge
Size Grommet DIN terminal Conduit terminal
P voltage suppressor)
Q R Q R Q R S Q R S T
1 1/8, 1/4 27 42 (47.5) 30 28.5 (34) 64.5 34 (39.5) 52.5 99.5 36 (41.5) 68.5 77 (83)
2 1/4, 3/8 29.5 53.5 (61.5) 32.5 39.5 (47.5) 67 45 (53) 55 102 47 (55) 71 89.5 (97.5)
1/4, 3/8 32 57.5 (65.5) 35 44 (52) 69.5 49.5 (57.5) 57.5 104.5 51.5 (59.5) 73.5 94 (102)
3
1/2 32 61 35 47.5 69.5 53 57.5 104.5 55 73.5 100.5
( ): Denotes the Normally Open (N.O.) dimensions.

32
Direct Operated 2 Port Solenoid Valve Series VX21/22/23
Medium Water Oil
vacuum

Dimensions/Body Material: C37, Stainless Steel

Specifications
Conduit Flat terminal

G1/2 D ≈ 280 Q F D 11 Q F
C

C
R
R

For Air
1.5

1.5
A B1 A B1
E

E
Y
Y

2xP B 2xP B
Port size Port size

For Medium
Vacuum
Terminal part
Flat terminal connector
W

W
M

M
U

U
250 Series

For Water
11
2 x ø5.3 X 6.5 9 2 x ø5.3 X
Mounting Mounting
hole hole
15

For Oil
For Steam
Special Options
Construction

3
1/2 29.5 50 25 85.5 40 14 24.5 — — — — —
Electrical entry
Port size
Size Conduit Flat terminal
P
Q R Q R
1 1/8, 1/4 47.5 36 (41.5) 23 42 (47.5)
2 1/4, 3/8 50 47 (55) 25.5 53.5 (61.5)
1/4, 3/8 52.5 51.5 (59.5) 28 57.5 (65.5)
3
1/2 52.5 55 28 61
( ): Denotes the Normally Open (N.O.) dimensions.

33
Series VX21/22/23
For Steam
∗ Can be used with heated water.

Dimensions/Body Material: C37, Stainless Steel

Grommet Conduit terminal
D
≈ 300 Q F 34 Q±2 F
D (42) ≈ 40

32
25
T
C

C
R

R
For steam and heated water
With full-wave rectifier
(AC type only)
1.5

1.5
A B1 A S±2
E

E
Y
Y

B B1
2xP 2xP
B
Port size Port size

W
W

M
M

U
U

2 x ø5.3 X 2 x ø5.3 X
Mounting Mounting
hole hole
Conduit DIN terminal
D Cable ø6 to ø12 Q F
≈ 280 Q F S
G1/2 D G1/2
(42) ≈ 45
(44)
31.5
23
C
R

For steam and heated water

C
R

With full-wave rectifier

(AC type only)
1.5

1.5

B1
E

A
Y

B A B1
Y

2xP
Port size 2xP B
Port size
W

W
M

M
U

2 x ø5.3 X 2 x ø5.3 X
Mounting Mounting
hole hole
(mm)
Port size Mounting bracket dimensions
Size
P A B B1 C D E F
M U W X Y
1 1/8, 1/4 19 43 21 61 (67) 30 9.5 20 12.8 46 36 11 6
2 1/4, 3/8 22 45 22.5 74.5 (82.5) 35 10.5 22 19 56 46 13 7
1/4, 3/8 22 45 22.5 79 (87) 40 10.5 24.5 19 56 46 13 7
3
1/2 29.5 50 25 85.5 40 14 24.5 — — — — —
Electrical entry
Size Port size Grommet Conduit terminal Conduit DIN terminal
P
Q R Q R S T Q R Q R S
1 1/8, 1/4 27 42 (47.5) 108 36 (41.5) 77 77 (83) 47.5 36 (41.5) 64.5 34 (39.5) 52.5
2 1/4, 3/8 29.5 53.5 (61.5) 110.5 47 (55) 79.5 89.5 (97.5) 50 47 (55) 67 45 (53) 55
1/4, 3/8 32 57.5 (65.5) 113 51.5 (59.5) 82 94 (102) 52.5 51.5 (59.5) 69.5 49.5 (57.5) 57.5
3
1/2 32 61 113 55 82 100.5 52.5 55 69.5 53 57.5
( ): Denotes the Normally Open (N.O.) dimensions.
Flat terminal is not available for valves for steam and heated water.

34
Direct Operated 2 Port Solenoid Valve Series VX21/22/23
Air Medium
vacuum

Dimensions/Manifold/Base Material: Aluminum

Specifications
2 x 3/8 <Common port>
IN port (For common SUP type)
OUT port (For individual SUP type)
L2
K L1 K Plug∗
2 x øM
Mounting P F N D
hole

C
H

For Air
B
A
Q6
Q1
Q2

J
Q5

S1
Q3

S2
11
Q4

≈ 300
≈ 300

For Medium
Vacuum
≈ 280

G1/2

32 25

For Water
∗ D side port does not have a plug.

D side Stations 1 2 3 4 5 6 7 U side

Cable ø6 to ø12
G1/2

For Oil
G1/2
(44)
T

R1, R6
R4

R5
R3

For Steam
R2

E
D

F F
n x 1/8,1/4 <Individual port>
OUT port (For common SUP type)
IN port (For individual SUP type)

(mm) Special Options

n (stations)
Size Dimensions
2 3 4 5 6 7 8 9 10
L1 86 122 158 194 230 266 302 338 374
1
L2 100 136 172 208 244 280 316 352 388
Construction

L1 90 126 162 198 234 270 306 342 378

2
L2 108 144 180 216 252 288 324 360 396
L1 103 144 185 226 267 308 349 390 431
3
L2 121 162 203 244 285 326 367 408 449

Size A B C D E F H J K M N P
1 38 15.5 10.5 11 25 32 20 12 7 6.5 50.5 (56.5) 36
Dimensions

2 49 18 13 13 30 36 22 15 9 8.5 60.5 (68.5) 36

3 49 20.5 13 13 30 40 24.5 15 9 8.5 65.5 (73.5) 41

Grommet (With surge

Grommet DIN terminal∗ Conduit terminal Conduit Flat terminal
Size voltage suppressor)
Q1 R1 Q2 R2 Q3 R3 S1 Q4 R4 S2 T Q5 R5 Q6 R6
1 27 40.5 (46.5) 30 27 (33) 64.5 32.5 (38.5) 52.5 99.5 34.5 (40.5) 68.5 66.5 (72) 47.5 34.5 (40.5) 23 40.5 (46.5)
2 29.5 49.5 (57.5) 32.5 36 (44) 67 41.5 (49.5) 55 102 43.5 (51.5) 71 75.5 (83.5) 50 43.5 (51.5) 25.5 49.5 (57.5)
3 32 54.5 (63) 35 41 (49) 69.5 46.5 (54.5) 57.5 104.5 48.5 (56.5) 73.5 80.5 (89.5) 52.5 48.5 (56.5) 28 54.5 (63)
( ): Denotes the Normally Open (N.O.) dimensions.
∗ When using a DIN terminal that faces downward, be careful of interference in the electrical wires and piping.

35
Series VX21/22/23
For Air, Medium Vacuum, Water, Oil and Steam

Replacement Parts
¡DIN Connector Part No.
<For Class B Coil> <For Class H Coil>
Electrical option Rated voltage Connector part no. Electrical option Rated voltage Connector part no.
24 VDC 24 VDC GDM2A-G-S5
12 VDC 100 VAC
100 VAC 110 VAC
110 VAC 200 VAC
200 VAC None 220 VAC
None C18312G6GCU GDM2A-R
220 VAC 230 VAC
230 VAC 240 VAC
240 VAC 24 VAC
24 VAC 48 VAC
48 VAC 24 VDC GDM2A-G-Z5
24 VDC GDM2A-L5 100 VAC GDM2A-R-L1
12 VDC GDM2A-L6 110 VAC GDM2A-R-L1
100 VAC GDM2A-L1 200 VAC GDM2A-R-L2
110 VAC GDM2A-L1 With light 220 VAC GDM2A-R-L2
200 VAC GDM2A-L2 230 VAC GDM2A-R-L2
With light
220 VAC GDM2A-L2 240 VAC GDM2A-R-L2
230 VAC GDM2A-L2 24 VAC GDM2A-R-L5
240 VAC GDM2A-L2 48 VAC GDM2A-R-L5
24 VAC GDM2A-L5
48 VAC GDM2A-L15
∗ Select an appropriate DIN connector suitable for the coil insulation type.

¡Gasket Part No. for DIN Connector

VCW20-1-29-1 (For Class B Coil)
VCW20-1-29-1-F (For Class H Coil)

¡Lead Wire Assembly for Flat Terminal

(Set of 2 pcs.)
VX021S-1-16FB

¡Bracket Assembly Part No. (for Metal Body)

VX02 N 12A
1 For VX2 14 
For VX2 25 
2
For VX2 36 

∗ 2 mounting screws are shipped together with the bracket assembly.

∗ On the bottom side of the standard body, there is no female thread for mounting a bracket.
Please select XNB.

36
Series VX21/22/23
Glossary of Terms

Pressure Terminology Electrical Terminology

1. Maximum operating pressure differential Second Characteristics:
The maximum pressure differential (the difference between Degrees of protection against water
the inlet and outlet pressure) which is allowed for operation. 0 Non-protected —
1 Protected against vertically falling water drops Dripproof type 1
When the outlet pressure is 0 MPa, this becomes the maxi-
Protected against vertically falling water drops
mum operating pressure. 2 when enclosure tilted up to 15° Dripproof type 2

2. Minimum operating pressure differential 3 Protected against rainfall when enclosure tilted up to 60° Rainproof type
4 Protected against splashing water Splashproof type
The minimum pressure differential (the difference between the
5 Protected against water jets Water-jet-proof type
inlet pressure and outlet pressure) required to keep the main 6 Protected against powerful water jets Powerful water-jet-proof type
valve fully open. 7 Protected against the effects of temporary immersion in water Immersible type
8 Protected against the effects of continuous immersion in water Submersible type
3. Maximum system pressure
The maximum pressure that can be applied inside the pipe- Example) IP65: Dust-tight, Water-jet-proof type
lines (line pressure). “Water-jet-proof type” means that no water intrudes
[The pressure differential of the solenoid valve portion must inside an equipment that could hinder from operating
normally by means of applying water for 3 minutes in
not exceed the maximum operating pressure differential.]
the prescribed manner. Take appropriate protection
4. Withstand pressure measures, since a device is not usable in an environ-
The pressure in which the valve must be withstood without a ment where a droplet of water is splashed constantly.
drop in performance after holding for one minute under pre-
scribed pressure and returning to the operating pressure
Others
range. [value under the prescribed conditions] 1. Material
NBR: Nitrile rubber
Electrical Terminology FKM: Fluororubber
EPDM: Ethylene propylene rubber
1. Apparent power (VA)
2. Oil-free treatment
Volt-ampere is the product of voltage (V) and current (A).
The degreasing and washing of wetted parts
Power consumption (W): For AC, W = V·A·cos θ.
For DC, W = V·A. 3. Symbol
Note) cos θ shows power factor. cos θ ≈ 0.9 In the symbol ( ), when the valve is closed, flow is blocked
from port 1 to port 2. However, if the pressure in port 2 is higher
2. Surge voltage
than port 1, the valve will not be able to block the fluid and it will
A high voltage which is momentarily generated by shutting off
flow from port 2 to port 1.
the power in the shut-off area.
3. Degree of protection
A degree defined in the “JIS C 0920: Waterproof test of elec-
Flat Terminal
tric machinery/appliance and the degree of protection against Flat terminal/Electrical connection size of molded coil
the intrusion of solid foreign objects.”

Verify the degree of protection for each product.

IP
6.35

First Second
characteristic characteristic
numeral numeral
3.4
First Characteristics: 8
Degrees of protection against solid foreign objects
0 Non-protected
1 Protected against solid foreign objects of 50 mmø and greater
0.8

2 Protected against solid foreign objects of 12 mmø and greater

3 Protected against solid foreign objects of 2.5 mmø and greater
Chamfer
4 Protected against solid foreign objects of 1.0 mmø and greater
5 Dust-protected
6 Dust-tight

37
Series VX21/22/23
Solenoid Valve Flow-rate Characteristics
(How to indicate flow-rate characteristics)

1. Indication of flow-rate characteristics

The flow-rate characteristics in equipment such as a solenoid valve etc. are indicated in their specifications as
shown in Table (1).
Table (1) Indication of Flow-rate Characteristics
Corresponding Indication by Other
Conformed standard
equipment international standard indications
ISO 6358: 1989
C, b —
JIS B 8390: 2000
Pneumatic
JIS B 8390: 2000
equipment S
— Equipment: JIS B 8373, 8374, 8375, 8379, 8381
Cv ANSI/(NFPA)T3.21.3: 1990
Process fluid Av — IEC60534-2-3: 1997
control JIS B 2005: 1995
equipment — Cv Equipment: JIS B 8471, 8472, 8473

2. Pneumatic equipment
2.1 Indication according to the international standards
(1) Conformed standard
ISO 6358: 1989 : Pneumatic fluid power—Components using compressible fluids—
Determination of flow-rate characteristics
JIS B 8390: 2000 : Pneumatic fluid power—Components using compressible fluids—
How to test flow-rate characteristics
(2) Definition of flow-rate characteristics
The flow-rate characteristics are indicated as a result of a comparison between sonic conductance C and
critical pressure ratio b.
Sonic conductance C : Value which divides the passing mass flow rate of an equipment in a choked flow
condition by the product of the upstream absolute pressure and the density in a
standard condition.
Critical pressure ratio b : Pressure ratio (downstream pressure/upstream pressure) which will turn to a choked
flow when the value is smaller than this ratio.
Choked flow : The flow in which the upstream pressure is higher than the downstream pressure and
where sonic speed in a certain part of an equipment is reached.
Gaseous mass flow rate is in proportion to the upstream pressure and not dependent
on the downstream pressure.
Subsonic flow : Flow greater than the critical pressure ratio
Standard condition : Air in a temperature state of 20°C, absolute pressure 0.1 MPa (= 100 kPa = 1 bar),
relative humidity 65%.
It is stipulated by adding the “(ANR)” after the unit depicting air volume.
(standard reference atmosphere)
Conformed standard: ISO 8778: 1990 Pneumatic fluid power—Standard reference
atmosphere, JIS B 8393: 2000: Pneumatic fluid power—Standard reference atmosphere
(3) Formula for flow rate
It is described by the practical units as following.
P2 + 0.1
When ———— ≤ b, choked flow
P1 + 0.1
293
Q = 600 x C (P1 + 0.1) ———— ································································ (1)
273 + t

When P 2 + 0.1
———— > b, subsonic flow
P1 + 0.1
2
P2 + 0.1
———— – b
P1 + 0.1 293
Q = 600 x C (P1 + 0.1) 1 – —————— ———— ···························· (2)
1–b 273 + t

Q : Air flow rate [dm3/min (ANR)], dm3 (Cubic decimeter) of SI unit are also allowed to be described by L (liter).
1 dm3 = 1 L
38
Solenoid Valve Flow-rate Characteristics Series VX21/22/23

C : Sonic conductance [dm3/(s·bar)]

b : Critical pressure ratio [—]
P1 : Upstream pressure [MPa]
P2 : Downstream pressure [MPa]
t : Temperature [°C]
Note) Formula of subsonic flow is the elliptic analogous curve.
Flow-rate characteristics are shown in Graph (1) For details, please make use of SMC’s “Energy Saving
Program.”
Example)
Obtain the air flow rate for P1 = 0.4 [MPa], P2 = 0.3 [MPa], t = 20 [°C] when a solenoid valve is performed in
C = 2 [dm3/(s·bar)] and b = 0.3.
293
According to formula 1, the maximum flow rate = 600 x 2 x (0.4 + 0.1) x ————— = 600 [dm3/min (ANR)]
273 + 20
0.3 + 0.1
Pressure ratio = ————— = 0.8
0.4 + 0.1
Based on Graph (1), the flow rate will be 0.7 when the pressure ratio is 0.8 and b = 0.3.
Hence, flow rate = Maximum flow rate x flow rate ratio = 600 x 0.7 = 420 [dm3/min (ANR)]

1 0.5
0.9
b = 0.1 0.6
0.8
0.2
0.7
Flow rate ratio

0.3
0.6
0.4
0.5
0.4
0.3 P1 Equipment P2
0.2 C, b
Q
0.1
0
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1
Pressure ratio (P2 + 0.1) / (P1 + 0.1)

(4) Test method Graph (1) Flow-rate characteristics

Attach a test equipment with the test circuit shown in Fig. (1) while maintaining the upstream pressure to a
certain level which does not go below 0.3 MPa. Next, measure the maximum flow to be saturated in the first
place, then measure this flow rate at 80%, 60%, 40%, 20% and the upstream and downstream pressure. And
then, obtain the sonic conductance C from this maximum flow rate. Besides that, substitute each data of
others for the subsonic flow formula to find b, then obtain the critical pressure ratio b from that average.

Pressure gauge or
pressure convertor
Thermometer
Differential pressure gauge or
differential pressure converter
ød1

Pressure control
equipment ød3 ≥ 3d1
Flow control
3d3
valve
ød2

Air Filter Shut off Flow meter

≥ 10d3 10d1 3d1 10d2 3d2
supply valve
Pipe for measuring Equipment
temperature for test
Pipe for Pipe for
measuring measuring
pressure in the pressure in the
upstream side downstream side

Fig. (1) Test circuit based on ISO 6358, JIS B 8390

39
Series VX21/22/23

2.2 Effective area S

(1) Conformed standard
JIS B 8390: 2000: Pneumatic fluid power—Components using compressible fluids—
Determination of flow rate characteristics
Equipment standards: JIS B 8373: 2 port solenoid valve for pneumatics
JIS B 8374: 3 port solenoid valve for pneumatics
JIS B 8375: 4 port, 5 port solenoid valve for pneumatics
JIS B 8379: Silencer for pneumatics
JIS B 8381: Fittings of flexible joint for pneumatics
(2) Definition of flow-rate characteristics
Effective area S : The cross-sectional area having an ideal throttle without friction deduced from the calcula-
tion of the pressure changes inside an air tank or without reduced flow when discharging
the compressed air in a choked flow, from an equipment attached to the air tank. This is the
same concept representing the “easy to run through” as sonic conductance C.
(3) Formula for flow rate

When P 2 + 0.1
———— ≤ 0.5, choked flow
P1 + 0.1
293
Q = 120 x S (P1 + 0.1) ———— ··································································(3)
273 + t

When P 2 + 0.1
———— > 0.5, subsonic flow
P1 + 0.1
293
Q = 240 x S (P2 + 0.1) (P1 – P2) ———— ··············································(4)
273 + t
Conversion with sonic conductance C :
S = 5.0 x C·······································································································(5)
Q : Air flow rate[dm3/min(ANR)], dm3 (cubic decimeter) of SI unit are also allowed to be described by L (liter)
1 dm3 = 1 L
S : Effective area [mm2]
P1 : Upstream pressure [MPa]
P2 : Downstream pressure [MPa]
t : Temperature [°C]
Note) Formula for subsonic flow (4) is only applicable when the critical pressure ratio b is the unknown
equipment. In the formula (2) by the sonic conductance C, it is the same formula as when b = 0.5.
(4) Test method
Attach a test equipment with the test circuit shown in Fig. (2) in order to discharge air into the atmosphere
until the pressure inside the air tank goes down to 0.25 MPa (0.2 MPa) from an air tank filled with the
compressed air at a certain pressure level (0.5 MPa) which does not go below 0.6 MPa. At this time, measure
the discharging time and the residual pressure inside the air tank which had been left until it turned to be the
normal values to determine the effective area S, using the following formula. The volume of an air tank should
be selected within the specified range by corresponding to the effective area of an equipment for test. In the
case of JIS B 8373, 8374, 8375, 8379, 8381, the pressure values are in parentheses and the coefficient of the
formula is 12.9.
V
t (
Ps + 0.1
P + 0.1
293
T )
S = 12.1 — log10 ————— —— ·················(6)
Thermometer
Pressure switch
Power
supply

Solenoid
S : Effective area [mm2] Pressure control
equipment
Control
circuit
valve
V : Air tank capacity [dm3] Equipment
for test
t : Discharging time [s] Air tank
Ps : Pressure inside air tank
Rectifier tube on the

Rectifier tube on the

Air Filter Shut off Pressure gauge

before discharging [MPa]
downstream side

supply valve or pressure

upstream side

P : Residual pressure inside air tank convertor

Timer (Clock)
after discharging [MPa] Pressure recorder
T : Temperature inside air tank
before discharging [K]
Fig. (2) Test circuit based on JIS B 8390

40
Solenoid Valve Flow-rate Characteristics Series VX21/22/23

2.3 Flow coefficient Cv factor

The United States Standard ANSI/(NFPA)T3.21.3: 1990: Pneumatic fluid power—Flow rating test proce-
dure and reporting method for fixed orifice components
Defines the Cv factor of flow coefficient by the following formula which is based on the test conducted by the
test circuit analogous to ISO 6358.
Q
Cv = ——————————— ·········································································(7)
∆P (P2 + Pa)
114.5 ——————
T1
∆P : Pressure drop between the static pressure tapping ports [bar]
P1 : Pressure of the upstream tapping port [bar gauge]
P2 : Pressure of the downstream tapping port [bar gauge]: P2 = P1 – ∆P
Q : Flow rate [dm3/s standard condition]
Pa : Atmospheric pressure [bar absolute]
T1 : Upstream absolute temperature [K]
Test conditions are < P1 + Pa = 6.5 ±0.2 bar absolute, T1 = 297 ±5 K, 0.07 bar ≤ ∆P ≤ 0.14 bar.
This is the same concept as effective area A which ISO 6358 stipulates as being applicable only when the
pressure drop is smaller than the upstream pressure and the compression of air does not become a problem.
3. Process fluid control equipment
(1) Conformed standard
IEC60534-2-3: 1997: Industrial process control valves. Part 2: Flow capacity, Section Three-Test proce-
dures
JIS B 2005: 1995: Test method for the flow coefficient of a valve
Equipment standards: JIS B 8471: Solenoid valve for water
JIS B 8472: Solenoid valve for steam
JIS B 8473: Solenoid valve for fuel oil
(2) Definition of flow-rate characteristics
Av factor: Value of the clean water flow rate represented by m3/s which runs through a valve (equipment for
test) when the pressure difference is 1 Pa. It is calculated using the following formula.
ρ
Av = Q ———— ····························································································(8)
∆P
Av : Flow coefficient [m2]
Q : Flow rate [m3/s]
∆P : Pressure difference [Pa]
ρ : Fluid density [kg/m3]
(3) Formula of flow rate
It is described by the practical units. Also, the flow-rate characteristics are shown in Graph (2).
In the case of liquid:
∆P
Q = 1.9 x 106Av ———— ···············································································(9)
G
Q : Flow rate [L/min]
Av : Flow coefficient [m2]
∆P : Pressure difference [MPa]
G : Relative density [water = 1]
In the case of saturated aqueous vapor:
Q = 8.3 x 106Av ∆P(P2 + 0.1) ·······································································(10)
Q : Flow rate [kg/h]
Av : Flow coefficient [m2]
∆P : Pressure difference [MPa]
P1 : Upstream pressure [MPa]: ∆P = P1 – P2
P2 : Downstream pressure [MPa]

41
Series VX21/22/23

Conversion of flow coefficient:

Av = 28 x 10–6 Kv = 24 x 10–6 Cv ···········································································(11)
Here,
Kv factor : Value of the clean water flow rate represented by m3/h which runs through a valve
at 5 to 40°C, when the pressure difference is 1 bar.
Cv factor (Reference values): Figures representing the flow rate of clean water by US gal/min which runs
through a valve at 60°F, when the pressure difference is 1 lbf/in2 (psi).
Value is different from Kv and Cv factors for pneumatic purpose due to different test method.
3 3

Water flow rate Q0 [L/min] (When Av = 1 x 10–6 [m2])

Saturated steam flow rate Q0 [kg/h] (when Av = 1 x 10–6 [m2])

2 Upstream pressure 2
P1 = 1 MPa

P1 = 0.8 MPa
1 1
0.9 0.9
0.8 Example 2 P1 = 0.6 MPa 0.8
0.7 0.7
0.6 P1 = 0.5 MPa 0.6
P1 = 0.4 MPa
0.5 0.5
0.4 0.4
P1 = 0.3 MPa Example 1
0.3 0.3
P1 = 0.2 MPa
0.2 0.2
P1 = 0.1 MPa

0.1 0.1
0.001 0.002 0.003 0.004 0.01 0.02 0.03 0.04 0.1

Pressure differential ∆P [MPa]

Graph (2) Flow-rate characteristics

Example 1)
Obtain the pressure difference when water 15 [L/min] runs through a solenoid valve with an Av = 45 x 10–6 [m2].
Since Q0 = 15/45 = 0.33 [L/min], according to Graph (2), if reading ∆P when Q0 is 0.33, it will be 0.031 [MPa].
Example 2)
Obtain the saturated steam flow rate when P1 = 0.8 [MPa], ∆P = 0.008 [MPa] with a solenoid valve with an
Av =1.5 x 10–6 [m2 ].
According to Graph (2), if reading Q0 when P1 is 0.8 and ∆P is 0.008, it is 0.7 [kg/h]. Hence, the flow rate
Q = 0.7 x 1.5 = 1.05 [kg/h].
(4) Test method
Attach a test equipment with the test circuit shown in Fig. (3). Next, pour water at 5 to 40°C, then measure the
flow rate with a pressure difference of 0.075 MPa. However, the pressure difference needs to be set with a
large enough difference so that the Reynolds number does not go below a range of 4 x 104 .
By substituting the measurement results for formula (8) to figure out Av.
Thermometer Test range

Equipment
Pressure Pressure
for test
tap tap

Restrictor Flow Restrictor

on the meter 2d 6d on the
upstream side downstream side
≥ 20d ≥ 10d

Fig. (3) Test circuit based on IEC60534-2-3, JIS B 2005

42
Series VX21/22/23
Flow-rate Characteristics 1
Note) Use this graph as a guide. In the case of obtaining an accurate flow rate, refer to pages 38 through to 42.

For Air
1.0 Upst
Downstream pressure of valve (P2) [MPa]

ream
pres
sure
of va
lve P
0.8 1 ≈ 1.0
MPa

0.6 0.9 Subsonic

cal
0.8 Critissure
pr e
0.7
0.4 0.6 Sonic
0.5
0.4
0.2 0.3
0.2
0.1
0
ø2
50 100 150 200 250 300 350 400
ø3
100 200 300 400 500
ø4
400 600 800 1,000 1,200
ø5
200 600 1,000 1,400
ø7
350 700
ø8
400 700 1,000 1,300
ø10 (Connection: 1/4)
500 700
ø10 (Connection: 3/8, 1/2)
700 1,000
Flow rate Q [L/min (ANR)]

How to read the graph

The sonic range pressure to generate a flow rate of 400 L/min (ANR) is P1 ≈ 0.2 MPa for a ø4 orifice and P1 ≈ 0.58 MPa for a ø3 orifice.

For Water
30 ø10 ø8 ø7
ø5
20 ø4, ø3

10 ø2

5
Flow rate Q [L/min]

4
3
2

0.1
0.001 (0.0018) (0.0054) 0.01 0.05 (0.07)
(0.013)

Pressure differential ∆P = (P1 − P2) [MPa]

How to read the graph

When a water flow of 2 L/min is generated, ∆P ≈ 0.013 MPa for a valve with ø3 orifice.

43
Series VX21/22/23
Flow-rate Characteristics 2
Note) Use this graph as a guide. In the case of obtaining an accurate flow rate, refer to pages 38 through to 42.

For Saturated Steam

(664)(183) Upst
1.0
Downstream pressure of valve (P2) [MPa]

ream
pres
(663)(179) sure
of va
0.8 (662)(174) lve P
1 ≈ 1.0
(661)(170)
MPa

0.6 0.9 Subsonic cal

Criti sure
(660)(164)

(658)(158)
0.8
p r e s
0.7
0.4 (656)(151) 0.6 Sonic
0.5
(654)(143)
0.4
0.2 (650)(133) 0.3
(646)(120) 0.2
0.1
0
ø2
5 10 15 20 25
ø3
10 15 20 25 30 35 40 45
ø4
10 20 30 40 50 60
ø5
20 30 40 50 60 70 80
ø7
20 30
ø8
40 60
ø10 (Connection: 1/4)
30 45
ø10 (Connection: 3/8, 1/2)
35 50
Flow rate Q [kg/h]

How to read the graph

The sonic range pressure to generate a flow rate of 15 kg/h is P1 ≈ 0.55 MPa for a ø2 orifice and P1 ≈ 0.28 MPa for a ø3 orifice.
The amount of potential heat varies somewhat based on the pressure P1. At 15 kg/h, there will be approximately 9700 kcal/h of heat.

44
VX21/22/23
Series
Specific Product Precautions 1
Be sure to read this before handling.
Refer to the back cover for Safety Instructions. For 2 Port Solenoid Valves for Fluid
Control Precautions, refer to “Handling Precautions for SMC Products” and the Operation
Manual on SMC website, http://www.smcworld.com

Design Selection

Warning Warning
1. Cannot be used as an emergency shutoff valve etc. 2. Fluid quality
The valves presented in this catalog are not designed for safety
applications such as an emergency shutoff valve. If the valves <Air>
are used in this type of system, other reliable safety assurance 1) Use clean air.
measures should also be adopted. Do not use compressed air that contains chemicals, synthetic
oils including organic solvents, salt or corrosive gases, etc.,
2. Extended periods of continuous energization as it can cause damage or malfunction.
The solenoid coil will generate heat when continuously ener-
gized. Avoid using in a tightly shut container. Install it in a well 2) Install an air filter.
ventilated area. Furthermore, do not touch it while it is being en- Install air filters close to the valves on the upstream side. A fil-
ergized or right after it is energized. tration degree of 5 µm or less should be selected.
3) Install an aftercooler or air dryer, etc.
3. Liquid rings
Compressed air that contains excessive drainage may cause
In cases with a flowing liquid, provide a bypass valve in the sys-
malfunction of valves and other pneumatic equipment. To
tem to prevent the liquid from entering the liquid seal circuit.
prevent this, install an aftercooler or air dryer, etc.
4. Actuator drive 4) If excessive carbon powder is generated, eliminate it by
When an actuator, such as a cylinder, is to be driven using a installing mist separators at the upstream side of valves.
valve, take appropriate measures to prevent potential danger If excessive carbon powder is generated by the compressor,
caused by actuator operation. it may adhere to the inside of the valves and cause a mal-
5. Pressure (including vacuum) holding function.
It is not usable for an application such as holding the pressure Refer to Best Pneumatics No.5 for further details on com-
(including vacuum) inside of a pressure vessel because air pressed air quality.
leakage is entailed in a valve.
6. When the conduit type is used as equivalent to an <Vacuum>
IP65 enclosure, install a wiring conduit etc. Please be aware that there is a range of pressure that can be
7. When an impact, such as water hammer etc., caused used.
by the rapid pressure fluctuation is applied, the sole- Atmospheric pressure Extreme
noid valve may be damaged. Give an attention to it. Low Medium High Ultra high high
Air pressure vacuum vacuum vacuum vacuum vacuum
Hydraulic pressure
Differential
pressure <Suction filtration, Vacuum bottle set, Suction cup>

Drying
Discharge/Plasma Neon tube/Fluorescent light
Selection Vapor
deposition
Surface
physics
Charged
Torr <Accelerator, Electron microscope> particle beam

Warning (mmHg) 102 10 1 10-1 10-2 10-3 10-4 10-5 10-6 10-7 10-8 10-9 10-10 10-11 10-12

1. Fluid Pa 109 108 107 106 105 104 103 102 101 1 10-1 10-2 10-3 10-4 10-5 10-6 10-7 10-8 10-9 10-10 10-11 10-12

1) Type of fluid
Before using a fluid, check whether it is compatible with the Vacuum piping direction: if the system uses a vacuum pump, we
materials of each model by referring to the fluids listed in this ask that you install the vacuum pump on the secondary side.
catalog. Use a fluid with a kinematic viscosity of 50 mm2/s or Also, install a filter on the primary side, and be careful that no
less. If there is something you do not know, please contact foreign object is picked up.
SMC. Please replace the valve after operating the device approxi-
2) Flammable oil, Gas mately 300,000 times.
Check the specifications for leakage in the interior and/or ex-
terior area.
3) Corrosive gas
Cannot be used since it will lead to cracks by stress corrosion
or result in other incidents.
4) When a brass body is used, then depending on water quality,
corrosion and internal leakage may occur. If such abnormali-
ties occur, exchange the product for a stainless steel body.
5) Use an oil-free specification when any oily particle must not
enter the passage.
6) Applicable fluid on the list may not be used depending on the
operating condition. Give adequate confirmation, and then
determine a model, just because the compatibility list shows
the general case.

45
VX21/22/23
Series
Specific Product Precautions 2
Be sure to read this before handling.
Refer to the back cover for Safety Instructions. For 2 Port Solenoid Valves for Fluid
Control Precautions, refer to “Handling Precautions for SMC Products” and the Operation
Manual on SMC website, http://www.smcworld.com

Selection Selection

Warning Warning
<Water> 5. Low temperature operation
The use of a fluid that contains foreign objects can cause 1) The valve can be used in an ambient temperature of between
problems such as malfunction and seal failure by promoting –20 to –10°C. However, take measures to prevent freezing or
wear of the valve seat and armature and by sticking to the solidification of impurities, etc.
sliding parts of the armature etc. Install a suitable filter 2) When using valves for water application in cold climates, take
(strainer) immediately upstream from the valve. As a general appropriate countermeasures to prevent the water from
rule, use 100 mesh. freezing in tubing after cutting the water supply from the
The supply water includes materials that create a hard pump, by draining the water etc. When warming by a heater
sediment or sludge such as calcium and magnesium. Since etc., be careful not to expose the coil portion to a heater.
this scale and sludge can cause the valve to malfunction, Installation of a dryer, heat retaining of the body is recom-
install water softening equipment, and a filter (strainer) mended to prevent a freezing condition in which the dew
directly upstream from the valve to remove these point temperature is high and the ambient temperature is low,
substances. and the high flow runs.
Tap water pressure:
The water pressure for tap water is normally 0.4 MPa or less. Caution
However, in places like a high-rise building, the pressure may 1. Leakage voltage
be 1.0 MPa. When selecting tap water, be careful of the maxi- Particularly when using a resistor in parallel with a switching
mum operating pressure differential. element and using a C-R element (surge voltage suppressor)
to protect the switching element, take note that leakage
When using water or heated water, poor operation or leaks
current will flow through the resistor, C-R element, etc.,
may be caused by dezincification, erosion, corrosion, etc.
creating a possible danger that the valve may not turn off.
The brass (C37) body of this product uses dezincification
resistant material as a standard. We also offer a stainless Switching element
steel body type with improved corrosion resistance. Please OFF Leakage voltage
use the one that fits your needs.
C R
Power supply

<Oil> SOL.
Generally, FKM is used as seal material, as it is resistant to Leakage current
oil. The resistance of the seal material may deteriorate
depending on the type of oil, manufacturer or additives.
AC coil: 5% or less of rated voltage
Check the resistance before using. The kinematic viscosity DC coil: 2% or less of rated voltage
must not exceed 50 mm2/s.
2. Selecting model
<Steam> Material depends on fluid. Select optimal models for the fluid.
The use of a steam that contains foreign objects can cause
problems such as malfunction and seal failure by promoting 3. When the fluid is oil.
wear of the valve seat and armature, and by sticking to the The kinematic viscosity must not exceed 50 mm2/s.
sliding parts of the armature etc. Install a suitable filter
(strainer) immediately upstream from the valve.
As a standard, the mesh count for the strainer is 100 mesh.
However, the size and shape of foreign objects that occur Mounting
depends on the operating environment. Check the fluid
status and choose an appropriate mesh count.
The supply water to a boiler includes materials that create a
Warning
hard sediment or sludge such as calcium and magnesium. 1. If air leakage increases or equipment does not
Sediment and sludge from steam can cause the valve to not operate properly, stop operation.
operate properly. Install a water softening device, which After mounting is completed, confirm that it has been done
removes these materials. Do not use operation steam which correctly by performing a suitable function test.
contains chemicals, synthetic oils containing organic 2. Do not apply external force to the coil section.
solvents, salts or corrosive gases, etc., as these can cause When tightening is performed, apply a wrench or other tool to
damage or deterioration. the outside of the piping connection parts.
3. Ambient environment 3. Mount a valve with its coil position upward, not
Use within the operable ambient temperature range. Check downward.
the compatibility between the product’s composition materials When mounting a valve with its coil positioned downward,
and the ambient atmosphere. Be certain that the fluid used foreign objects in the fluid will adhere to the iron core leading
does not touch the external surface of the product. to a malfunction. Especially for strict leakage control, such as
4. Countermeasures against static electricity with vacuum applications and non-leak specifications, the coil
Take measures to prevent static electricity since some fluids must be positioned upward.
can cause static electricity. 4. Do not warm the coil assembly with a heat insulator
etc.
Use tape, heaters, etc., for freeze prevention on the piping and
body only. They can cause the coil to burn out.
46
VX21/22/23
Series
Specific Product Precautions 3
Be sure to read this before handling.
Refer to the back cover for Safety Instructions. For 2 Port Solenoid Valves for Fluid
Control Precautions, refer to “Handling Precautions for SMC Products” and the Operation
Manual on SMC website, http://www.smcworld.com

Mounting Disassembly/Assembly Procedures

Warning Caution
5. Secure with brackets, except in the case of steel piping <N.C.> <N.O.>
and copper fittings.
Mounting screw
6. Avoid sources of vibration, or adjust the arm from the body
to the minimum length so that resonance will not occur.
7. Painting and coating Mounting screw
Warnings or specifications printed or labeled on the product
should not be erased, removed or covered up.
Coil assembly

Disassembly/Assembly Procedures
O-ring A

Caution Coil assembly

O-ring B
1. Before starting the disassembly work, be sure to
shut off the power supply and pressure supply, and
then release the residual pressure. Seal
Adapter
Disassembly
<N.C.> Return spring

1) Loosen the mounting screws. Push rod assembly

The coil assembly, seal, return spring, armature assembly and

body can be removed. Armature assembly
Spring
<N.O.>
1) Loosen the mounting screws.
The coil assembly, push rod assembly, O-rings, adapter and O-ring C

body can be removed.

Assembly
<Common to N.C. and N.O.>
1) Mount the components on the body in the reverse order of
disassembly.
Aluminum
2) When changing the electrical entry direction, turn the coil Resin body Metal body ( C37
Stainless steel
)
assembly in a desired direction to mount it.
3) Push the coil assembly against the body and tighten the screws
two or more rounds diagonally (Fig. 2) in the status that there
are no gaps between the coil assembly and body (Fig. 1).
Tighten the screws in the order of “12341234”.
Proper Tightening Torque (N·m)
Body
VX21 0.5
VX22
0.7 Bracket
VX23

1 3
No gaps

4 2

Fig.1 Fig.2

∗ After tightening the screws, make sure that there are no gaps between the
coil and body (Fig. 1).
∗ After the disassembly and assembly have been completed, make sure
that no leak occurs from the seal. Additionally, when restarting the valve,
make sure that the valve operates correctly after checking the safety.
47
VX21/22/23
Series
Specific Product Precautions 4
Be sure to read this before handling.
Refer to the back cover for Safety Instructions. For 2 Port Solenoid Valves for Fluid
Control Precautions, refer to “Handling Precautions for SMC Products” and the Operation
Manual on SMC website, http://www.smcworld.com

Disassembly/Assembly Procedures Piping

Caution Warning
Manifold Exploded View 1. During use, deterioration of the tube or damage to
the fittings could cause tubes to come loose from
Mounting screw
their fittings and thrash about.
To prevent uncontrolled tube movement, install protective
covers or fasten tubes securely in place.
Solenoid valve for manifold 2. For piping the tube, fix the product securely using the
mounting holes so that the product is not in the air.

Caution
1. Preparation before piping
Gasket Before piping is connected, it should be thoroughly blown out
with air (flushing) or washed to remove chips, cutting oil and
other debris from inside the pipe. Avoid pulling, compressing, or
bending the valve body when piping.
2. Avoid connecting ground lines to piping, as this may
cause electric corrosion of the system.
3. Always tighten threads with the proper tightening
torque.
IN port (Common SUP) When using steel piping, tighten with the proper tightening
OUT port (Individual SUP)
torque shown below.
Manifold base Lower tightening torque will lead into fluid leakage.

OUT port (Common SUP)

Tightening Torque for Piping
IN port (Individual SUP) Thread size Proper tightening torque (N·m)
Rc1/8 7 to 9
Individual port
Rc1/4 12 to 14
Rc3/8 22 to 24
Common SUP Individual SUP Rc1/2 28 to 30
for air for medium vacuum
Gasket 4. Connection of piping to products
When connecting piping to a product, avoid mistakes regarding
Solenoid valve the supply port etc.
interface for
IN port
manifold 5. Wrapping of sealant tape
Winding
When connecting pipes, fittings, direction
etc., be sure that chips from the
IN port pipe threads and sealing material Sealant tape
do not enter the valve. Ex
Furthermore, when sealant tape is 2 t pos
hr e a
Individual port side Individual port side ea
used, leave 1.5 to 2 thread ridges ds ppro
x.
∗ Mounting orientation exists when mounting valves onto manifold base. exposed at the end of the threads.
Mount it as shown above.
∗ Take great care when special electrical entry direction (XC) is used. 6. In applications such as vacuum and non-leak speci-
fications, use caution specifically against the
contamination of foreign objects or airtightness of
the fittings.

48
VX21/22/23
Series
Specific Product Precautions 5
Be sure to read this before handling.
Refer to the back cover for Safety Instructions. For 2 Port Solenoid Valves for Fluid
Control Precautions, refer to “Handling Precautions for SMC Products” and the Operation
Manual on SMC website, http://www.smcworld.com

Recommended Piping Conditions Wiring

1. When connecting tubes using One-touch fittings,
provide some spare tube length shown in Fig. 1, rec- Warning
ommended piping configuration. 1. Do not apply AC voltage to Class “H” coil AC type
Also, do not apply external force to the fittings when binding unless it is built in full-wave rectifier, or the coil will
tubes with bands etc. (see Fig. 2.) be damaged.

Caution
1. As a rule, use electrical wire with a cross sectional
Straight area of 0.5 to 1.25 mm2 for wiring.
portion
Mounting
Furthermore, do not allow excessive force to be ap-
pitch A plied to the lines.
2. Use electrical circuits which do not generate chatter-
Fig. 1 Recommended piping configuration ing in their contacts.
Unit: mm 3. Use voltage which is within ±10% of the rated volt-
Tube Mounting pitch A Straight age. In cases with a DC power supply where impor-
size Nylon tubing Soft nylon tubing Polyurethane tubing portion length tance is placed on responsiveness, stay within ±5%
ø1/8" 44 or more 29 or more 25 or more 16 or more of the rated value. The voltage drop is the value in
ø6 84 or more 39 or more 39 or more 30 or more the lead wire section connecting the coil.
ø1/4" 89 or more 56 or more 57 or more 32 or more
4. When a surge from the solenoid affects the electrical
ø8 112 or more 58 or more 52 or more 40 or more
circuitry, install a surge voltage suppressor etc., in
ø10 140 or more 70 or more 69 or more 50 or more
parallel with the solenoid. Or, adopt an option that
ø12 168 or more 82 or more 88 or more 60 or more
comes with the surge voltage protection circuit.
(However, a surge voltage occurs even if the surge
voltage protection circuit is used. For details, please
consult with SMC.)

Recommended Unacceptable

Fig. 2 Binding tubes with bands

49
VX21/22/23
Series
Specific Product Precautions 6
Be sure to read this before handling.
Refer to the back cover for Safety Instructions. For 2 Port Solenoid Valves for Fluid
Control Precautions, refer to “Handling Precautions for SMC Products” and the Operation
Manual on SMC website, http://www.smcworld.com

Operating Environment Electrical Connections

Warning Caution
1. Do not use in an atmosphere having corrosive gas-  Grommet
es, chemicals, sea water, water, water steam, or
Class B coil: AWG20 Insulator O.D. 2.5 mm
where there is direct contact with any of these.
Class H coil: AWG18 Insulator O.D. 2.1 mm
2. Do not use in explosive atmospheres.
3. Do not use in locations subject to vibration or im-
pact. q
4. Do not use in locations where radiated heat will be
received from nearby heat sources.
w
5. Employ suitable protective measures in locations
where there is contact with water droplets, oil or
welding spatter, etc. Lead wire color
Rated voltage
q w
Maintenance DC Black Red
100 VAC Blue Blue
Warning 200 VAC Red Red
1. Removing the product Other AC Gray Gray
The valve will reach a high temperature when used with high ∗ There is no polarity.
temperature fluids. Confirm that the valve temperature has
dropped sufficiently before performing work. If touched inadver-  DIN terminal
tently, there is a danger of being burned.
Since internal connections are shown below for the DIN termi-
1) Shut off the fluid supply and release the fluid pressure in
nal, make connections to the power supply accordingly.
the system.
2) Shut off the power supply. 1: +
(−)
3) Dismount the product.
+ 3
1

2. Low frequency operation

— 2: −
Switch valves at least once every 30 days to prevent malfunc- (+)
tion. Also, in order to use it under the optimum state, conduct a
regular inspection once a half year.

Caution
1. Filters and strainers
Terminal no. 1 2
1) Be careful regarding clogging of filters and strainers.
DIN terminal + (−) − (+)
2) Replace filter elements after one year of use, or earlier if
∗ There is no polarity.
the pressure drop reaches 0.1 MPa. • Use compatible heavy duty cords with cable O.D. ø6 to ø12 mm.
3) Clean strainers when the pressure drop reaches 0.1 MPa. • Use the tightening torques below for each section.
2. Lubrication
Binding head screw with flange
When using after lubricating, never forget to lubricate continu- Connector Tightening torque 0.5 to 0.6 N·m
ously.
3. Storage
In case of long term storage after use, thoroughly remove all
moisture to prevent rust and deterioration of rubber materials
etc.
Compatible cable Note)
4. Exhaust the drainage from an air filter periodically. Gasket
Washer
(Cable O.D. ø6 to ø12 mm)

Rubber seal
Operating Precautions
Binding head screw
Warning Tightening torque 0.5 to 0.6 N·m

1. If there is a possibility of reverse pressure being ap- Note) For an outside cable O.D. ø9 to ø12 mm, remove the internal parts
plied to the valve, take countermeasures such as of the rubber seal before using.
mounting a check valve on the downstream side of
the valve.
2. When problems are caused by a water hammer, in-
stall water hammer relief equipment (accumulator
etc.), or use an SMC water hammer relief valve
(Series VXR). For details, please consult with SMC.
50
VX21/22/23
Series
Specific Product Precautions 7
Be sure to read this before handling.
Refer to the back cover for Safety Instructions. For 2 Port Solenoid Valves for Fluid
Control Precautions, refer to “Handling Precautions for SMC Products” and the Operation
Manual on SMC website, http://www.smcworld.com

Electrical Connections Electrical Circuits

Caution Caution
 Conduit terminal [DC circuit]
In the case of the conduit terminal, make connections accord- Grommet, Flat terminal Grommet, DIN terminal,
ing to the marks shown below. Conduit terminal, Conduit
Varistor
• Use the tightening torques below for each section.
1 (+, –) 1 (+, –)
• Properly seal the terminal connection (G1/2) with the special
wiring conduit etc. SOL. SOL.

Terminal cover
2 (–, +) 2 (–, +)
Round head combination screw
Without electrical option With surge voltage suppressor
M3 A
Tightening torque 0.5 to 0.6 N·m
DIN terminal, Conduit terminal
Varistor
+ Mark
– Mark

2 1
− + 1 (+, –)
A
SOL.

G1/2 2 (–, +)
Round head
combination screw Tightening torque
Light
0.5 to 0.6 N·m
M3 Tightening torque
0.5 to 0.6 N·m Conduit terminal With light/surge voltage suppressor
View A-A
(Internal connection diagram)
[AC circuit]
∗ For AC (Class B), the standard product is equipped with surge voltage
 Conduit suppressor.
When used as an IP65 equivalent, use seal to install the wiring Grommet, DIN terminal, DIN terminal, Conduit terminal
conduit. Also, use the tightening torque below for the conduit. Conduit terminal, Conduit
Varistor
Class B coil: AWG20 Insulator O.D. 2.5 mm Varistor Rectifier Rectifier
element
1 1 element
Class H coil: AWG18 Insulator O.D. 2.1 mm
Lead wire
SOL. SOL.
q
2 2
Light

Without electrical option With light/surge voltage suppressor

Wiring conduit
Seal One-touch Fitting
(Bore size G1/2 Tightening torque 0.5 to 0.6 N·m)

Lead wire color

Caution
Rated voltage For information on handling One-touch fittings and
q w
DC Black Red appropriate tubing, refer to page 48 and the KQ2 se-
100 VAC Blue Blue ries One-touch fittings in Best Pneumatics No. 6.
200 VAC Red Red The KQ2 series information can be downloaded from
Other AC Gray Gray the following SMC website, http://www.smcworld.com
∗ There is no polarity.

Description Part no.

Seal VCW20-15-6
Note) Please order separately.

51
These safety instructions are intended to prevent hazardous situations and/or
Safety Instructions equipment damage. These instructions indicate the level of potential hazard with
the labels of “Caution,” “Warning” or “Danger.” They are all important notes for
safety and must be followed in addition to International Standards (ISO/IEC)∗1),
and other safety regulations.
∗1) ISO 4414: Pneumatic fluid power – General rules relating to systems.
Caution indicates a hazard with a low level of risk which,
Caution: if not avoided, could result in minor or moderate injury.
ISO 4413: Hydraulic fluid power – General rules relating to systems.
IEC 60204-1: Safety of machinery – Electrical equipment of machines.
(Part 1: General requirements)
Warning indicates a hazard with a medium level of risk which,
Warning: if not avoided, could result in death or serious injury.
ISO 10218-1: Manipulating industrial robots – Safety.
etc.
Danger indicates a hazard with a high level of risk which,
Danger : if not avoided, will result in death or serious injury.

Warning Caution
1. The compatibility of the product is the responsibility of the 1. The product is provided for use in manufacturing industries.
person who designs the equipment or decides its The product herein described is basically provided for peaceful use in
specifications. manufacturing industries.
Since the product specified here is used under various operating conditions, If considering using the product in other industries, consult SMC beforehand
its compatibility with specific equipment must be decided by the person who and exchange specifications or a contract if necessary.
designs the equipment or decides its specifications based on necessary If anything is unclear, contact your nearest sales branch.
analysis and test results. The expected performance and safety assurance
of the equipment will be the responsibility of the person who has determined Limited warranty and Disclaimer/
its compatibility with the product. This person should also continuously
review all specifications of the product referring to its latest catalog Compliance Requirements
information, with a view to giving due consideration to any possibility of The product used is subject to the following “Limited warranty and Disclaimer” and
equipment failure when configuring the equipment. “Compliance Requirements”.
Read and accept them before using the product.
2. Only personnel with appropriate training should operate
machinery and equipment. Limited warranty and Disclaimer
The product specified here may become unsafe if handled incorrectly. The
assembly, operation and maintenance of machines or equipment including
1. The warranty period of the product is 1 year in service or 1.5 years after
our products must be performed by an operator who is appropriately trained
the product is delivered, whichever is first.∗2)
and experienced. Also, the product may have specified durability, running distance or
replacement parts. Please consult your nearest sales branch.
3. Do not service or attempt to remove product and machinery/ 2. For any failure or damage reported within the warranty period which is clearly our
equipment until safety is confirmed. responsibility, a replacement product or necessary parts will be provided.
1. The inspection and maintenance of machinery/equipment should only be This limited warranty applies only to our product independently, and not to any
performed after measures to prevent falling or runaway of the driven other damage incurred due to the failure of the product.
objects have been confirmed.
3. Prior to using SMC products, please read and understand the warranty terms
2. When the product is to be removed, confirm that the safety measures as and disclaimers noted in the specified catalog for the particular products.
mentioned above are implemented and the power from any appropriate
∗2) Vacuum pads are excluded from this 1 year warranty.
source is cut, and read and understand the specific product precautions A vacuum pad is a consumable part, so it is warranted for a year after it is delivered.
of all relevant products carefully. Also, even within the warranty period, the wear of a product due to the use of the vacuum pad
3. Before machinery/equipment is restarted, take measures to prevent or failure due to the deterioration of rubber material are not covered by the limited warranty.
unexpected operation and malfunction.
4. Contact SMC beforehand and take special consideration of
Compliance Requirements
safety measures if the product is to be used in any of the 1. The use of SMC products with production equipment for the manufacture of
following conditions. weapons of mass destruction (WMD) or any other weapon is strictly prohibited.
1. Conditions and environments outside of the given specifications, or use 2. The exports of SMC products or technology from one country to another are
outdoors or in a place exposed to direct sunlight. governed by the relevant security laws and regulations of the countries involved
2. Installation on equipment in conjunction with atomic energy, railways, air in the transaction. Prior to the shipment of a SMC product to another country,
navigation, space, shipping, vehicles, military, medical treatment, assure that all local rules governing that export are known and followed.
combustion and recreation, or equipment in contact with food and
beverages, emergency stop circuits, clutch and brake circuits in press
applications, safety equipment or other applications unsuitable for the Caution
standard specifications described in the product catalog.
SMC products are not intended for use as instruments for legal
3. An application which could have negative effects on people, property, or metrology.
animals requiring special safety analysis. Measurement instruments that SMC manufactures or sells have not been
4. Use in an interlock circuit, which requires the provision of double interlock qualified by type approval tests relevant to the metrology (measurement) laws
for possible failure by using a mechanical protective function, and of each country. Therefore, SMC products cannot be used for business or
periodical checks to confirm proper operation. certification ordained by the metrology (measurement) laws of each country.

Revision history
Edition B ∗ Added N.O. valve. Edition D ∗ Faston terminal is changed to flat terminal.
∗ Added steam as a fluid (Insulation type Class H). ∗ Added UL-compliant (For Air/Water).
∗ Added manifold. ∗ Increased pages from 52 to 56. SZ
∗ Increased pages from 32 to 48. QV
Edition C ∗ Added installation options.
∗ Added disassembly/assembly procedures.
∗ Leakage voltage (AC coil) was corrected from 10% or less to 5% or less.
∗ Increased pages from 48 to 52. RX

Safety Instructions Be sure to read “Handling Precautions for SMC Products” (M-E03-3) before using.

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