Operating Environment
Warning
1. Do not use in an atmosphere containing 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. A protective cover should be used to shield the
product from direct sunlight.
5. Remove any sources of excessive heat.
6. Employ suitable protective measures in locations
where there is contact with water droplets, oil,
welding spatter, etc.
7. Install a silencer into exhaust port to prevent the
ingress of dust if there is a lot of dust in the
atmosphere.
If dust enters the valve via exhaust port, it may cause air leakage.
If any ambient environments from 1 to 7 mentioned above are
true for your operating conditions, select the metal handle type
for your safety.
Maintenance
Warning
1. When equipment is to be removed, first confirm that
measures are in place to prevent dropping of driven
objects and run-away of equipment, etc. Then cut
the supply air pressure and electric power, and
exhaust all compressed air from the system using
its residual pressure release function.
When the equipment is to be started again after remounting or
replacement, first confirm that measures are in place to
prevent lurching of actuators and then confirm that equipment
operates normally.
2. Do not disassemble the product.
It will cause damage to the product and result in operation
failure.
Piping
Warning
5. When an SMC One-touch fitting is used, refer to the
operation manual for the One-touch fitting.
6. Silencer is recommended in the exhaust port.
When mounting a built-in resin silencer (VHS series/optional),
tighten it by hand, and then use a tool on the width across flats
of the octagonal part to tighten it additionally until it is attached
firmly on the end. When mounting the resin silencers (AN
series), use a tool on the width across flats of the hexagonal
part to tighten it an additional 1/4 turn after tightening the
silencer by hand.
When installing One-touch fittings (KQ2 series), add a 1/2 turn
after tightening it by hand. Excess tightening torque may
damage the resin silencers or the threads of the exhaust port.
Air Supply
Warning
1. Air containing a large amount of drainage can
cause a malfunction. Install an air dryer or after-
cooler on the inlet side of the product.
Caution
1. Use an air filter with 5
μ
m or less filtration rating on
the inlet side to avoid any damage to the seat
caused by dust.
2. Install a mist separator on the inlet side to remove
carbon powder from the compressor or other
equipment. An excessive amount of carbon dust
ingress via the inlet may cause the valve to
malfunction.
Refer to “SMC Air Preparation System” for further details on
compressed air quality.
VHS20/30/40/50-D
Series
Specific Product Precautions 2
Be sure to read this before handling the products. Refer to the back cover for safety instructions.
For 3/4/5-port solenoid valve precautions, refer to the “Handling Precautions for SMC Products”
and the “Operation Manual” on the SMC website: https://www.smcworld.com
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