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Caution
Operating Environment
Warning
Straight
portion
Mounting
pitch
A
Recommended Piping Conditions
1. When connecting tubes using one-touch fittings,
provide some spare tube length shown in Fig. 1,
recommended piping configuration.
Also, do not apply external force to the fittings when binding
tubes with bands, etc. (see Fig. 2.)
Tube
size
Mounting pitch
A
Unit: mm
Nylon tube
Soft nylon tube Polyurethane tube
44 or more
56 or more
84 or more
29 or more
30 or more
39 or more
25 or more
26 or more
39 or more
Straight
portion length
ø3.2
ø4
ø6
16 or more
20 or more
30 or more
1. Do not use in an atmosphere having corrosive
gases, chemicals, sea water, water, water steam, or
where there is direct contact with any of these.
2. Do not use in explosive atmospheres.
3. Do not use in locations subject to vibration or
impact.
4. Do not use in locations where radiated heat will be
received from nearby heat sources.
5. Employ suitable protective measures in locations
where there is contact with water droplets, oil or
welding spatter, etc.
Maintenance
Warning
1. Filters and strainers
1) Be careful regarding clogging of filters and strainers.
2) Replace filter elements after one year of use, or earlier if the
pressure drop reaches 0.1 MPa.
3) Clean strainers when the pressure drop reaches 0.1 MPa.
2. Lubrication
When using after lubricating, never forget to lubricate continu-
ously.
3. Storage
In case of long term storage after use with heated water,
thoroughly remove all moisture to prevent rust and deteriora-
tion of rubber materials, etc.
4. Exhaust the drainage from an air filter periodically.
1. Removing the product
The valve will reach a high temperature when used with high
temperature fluids. Confirm that the valve temperature has
dropped sufficiently before performing work. If touched
inadvertently, there is a danger of being burned.
1) Shut off the fluid supply and release the fluid pressure in the
system.
2) Shut off the power supply.
3) Remove the product.
2. Low frequency operation
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.
Operating Precautions
Warning
1. If there is a possibility of reverse pressure being
applied to the valve, take countermeasures such as
mounting a check valve on the downstream side of
the valve.
2. When problems are caused by a water hammer,
install water hammer relief equipment (accumulator,
etc.), or use an SMC water hammer relief valve
(Series VXR). For details, please consult with SMC.
Wiring
Caution
1. As a rule, use electric wire with a cross sectional
area of 0.5 to 1.25 mm
2
for wiring.
Furthermore, do not allow excessive force to be
applied to the lines.
2. Use electric circuits which do not generate chatter-
ing in their contacts.
3.
Use voltage which is within ±10% of the rated
voltage. In cases with a DC power supply where
importance is placed on responsiveness, stay within
±5% of the rated value. The voltage drop is the value
in the lead wire section connecting the coil.
4. When a surge from the solenoid affects the electri-
cal circuitry, install a surge voltage suppressor,
etc., in parallel with the solenoid. Or, adopt an
option that 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
Fig. 1 Recommended piping configuration
Series VDW
Specific Product Precautions 3
Be sure to read before handling.
Refer to back cover for Safety Instructions, “Handling Precautions for SMC Products”
(M-E03-3) and the Operation Manual for 2 Port Solenoid Valves for Fluid Control
Precautions. Please download it via our website, http://www.smcworld.com
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