The maximum operating pressure differential differs depending
on the flow direction of the fluid. If the pressure differential at
each port exceeds the values in the table below, valve leakage
may occur.
Model
VDW30
VDW40
1.0
3.0
4.5
6.0
Orifice diameter
(mm ø)
Max. operating pressure differential
(MPa)
Pressure port 1
0.6
0.1
0.1 (With power-saving circuit)
0.05 (Without power-saving circuit)
0.05 (With power-saving circuit)
0.02 (Without power-saving circuit)
2 Port Valve
Fluid Flow Direction
Caution
For information on handling One-touch fittings and
appropriate tubing, see Series KQ2 One-touch fittings
in Best Pneumatics No. 6. It can be downloaded from
the SMC Web site: http://www.smcworld.com/
One-touch Fittings
Caution
OUT
(2)
(1)
IN
SOL.
Power-saving
circuit
Red (+)
Black (–)
DC circuit
Standard coil
Coil with power-saving circuit
1 (+, –)
2 (–, +)
SOL.
Electrical Connections
Caution
1. Solenoid valves with power-saving circuits (coil
part number “-5GE”) have polarity, so follow the
wiring diagram below when making connections.
Standard coils have no polarity.
The solenoid valve will not switch properly if the polarity is re-
versed.
2. Apply the correct voltage.
Incorrect voltage could cause shorting of the power-saving cir-
cuit, coil burnout, or valve malfunction.
3. Do not apply a tension load of 30 N or more to the
solenoid valve lead wires.
4. Apply voltage which is within
±
10% of the rated vol-
tage.
Also, do not use excessive power supply voltage or superim-
pose electrical noise such as ripple voltage on the power sup-
ply voltage as these could harm the valve.
5. When connecting an induction load such as a cir-
cuit protector to the solenoid valve connection,
take measures to ensure that the current to the sol-
enoid valve is not reduced too much.
Maintenance
Warning
1. Do not disassemble solenoid valves.
Disassembling a solenoid valve will void its warranty.
2. Low frequency operation
Switch valves at least once every 30 days to prevent
malfunction. Also, in order to use it under the optimum state,
conduct a regular inspection once a half year.
Caution
1. Store indoors in a location away from direct sun-
light and where the following conditions are main-
tained.
• Temperature: –10 to 50
°
C
• Relative humidity: 20% to 85%RH (No condensation)
• Liquid rings may not be used.
2. Storage
When not using for a long time (more than approx. one
month) after use with liquid, thoroughly remove all moisture to
prevent rust and deterioration of rubber materials, etc.
Series
VDW30/40
Specific Product Precautions 2
Be sure to read before handling. Refer to back cover for Safety Instructions, “Handling
Precautions for SMC Products” (M-E03-3) for Fluids Control 2 Port Valves Precautions,
and Series VDW in Best Pneumatics No. 7 for Specific Product Precautions.
7
VDW30-Info.qxd 10.5.31 10:51 AM Page 7
Courtesy of Steven Engineering, Inc.-230 Ryan Way, South San Francisco, CA 94080-6370-Main Office: (650) 588-9200-Outside Local Area: (800) 258-9200-www.stevenengineering.com
