Warning
Warning
Design / Selection
1. Confirm the specifications.
Products represented in this manual are designed only for use
in compressed air systems (including vacuum).
Do not operate at pressures or temperatures, etc., beyond the
range of specifications, as this can cause damage or
malfunction. (Refer to the specifications.)
Please contact SMC when using a fluid other than compressed
air (including vacuum).
We do not guarantee against any damage if the product is
used outside of the specification range.
2. Actuator drive
When an actuator, such as a cylinder, is to be driven using a
valve, take appropriate measures (cover installation or
approach prohibition) to prevent potential danger caused by
actuator operation.
3. Holding pressure (including vacuum)
Since the valves are subject to air leakage, they cannot be
used for applications such as holding pressure (including
vacuum) in a pressure vessel.
4. Not suitable for use as an emergency shutoff
valve, etc.
The valves listed in this manual are not designed for safety
applications such as an emergency shutoff valve. If the valves
are used for the mentioned applications, additional safety
measures should be adopted.
5. Release of residual pressure
For maintenance purposes install a system for releasing
residual pressure.
6.
Operation in a vacuum condition
When a valve is used for switching a vacuum, take measures
to install a suction filter or similar to prevent external dust or
other foreign matter from entering inside the valve. In addition,
at the time of vacuum adsorption, be sure to vacuum at all
times. Failure to do so may result in foreign matter sticking to
the adsorption pad, or air leakage causing the workpiece to
drop.
7. Regarding a vacuum switch valve and a
vacuum release valve
If a non-vacuum valve is installed in the middle of piping
system having a vacuum, the vacuum condition will not be
maintained. Use a valve designed for use under vacuum
condition.
8. Ventilation
Provide ventilation when using a valve in a confined area, such
as in a closed control panel. For example, install a ventilation
opening, etc. in order to prevent pressure from increasing
inside of the confined area.
9 .Do not disassemble the product or make any
modifications, including additional machining.
Doing so may cause human injury and/or an accident.
When the product is disassembled for maintenance, refer to
“Overhaul / Cleaning / Addition of grease (VPA31*5V series:
Vacuum Specification)”.
Selection
1. Use in low temperature environments
Valve use is possible to temperature to 0
o
C. Take appropriate
measures to avoid freezing or congealing of drain, water, etc.
2. Pilot air
The pilot port should be pressurized by a compressed air at
the specified pressure.
3. Mounting orientation
Mounting orientation is free.
Mounting
1. Operation manual
Install the products and operate them only after reading the
operation manual carefully and understanding its contents.
Also, keep the manual where it can be referred to as
necessary.
2. Ensure sufficient space for maintenance
activities.
When installing the products, allow access for maintenance.
3. Tighten threads with the proper tightening
torque.
When installing the products, follow the listed torque
specifications.
4. If air leakage increases or equipment does not
operate properly, stop operation.
Check mounting conditions when air and power supplies are
connected. Initial function and leakage tests should be
performed after installation.
5. Painting and coating
Warnings or specifications printed or affixed to the product
should not be erased, removed or covered up.
Please consult with SMC before applying paint to resinous
parts, as this may have an adverse effect due to the solvent in
the paint.
VPA31
∗
5 Series
Precautions for 3 Port Air Operated Valve
①
Be sure to read before handling.
Caution
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VP3145-OMH0005-D
