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VG300
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OMH0002-B
Design
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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 com-
pressed 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 va-
cuum 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 and to release the
heat generated by the valve.
9. Extended periods of continuous energization
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If a valve will be continuously energized for an extended
period of time, the temperature of the valve will increase
due to the heat generated by the coil. This will likely
adversely affect the performance of the solenoid valve
and any nearby peripheral equipment. Therefore, when
it is continuously energized or the energized period per
day is longer than the de-energized period use
continuous energization type.
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For applications such as mounting a valve on a control
panel, incorporate measure to limit the heat radiation so
that it is within the operating temperature range.
10. Do not disassemble the product or make any
modifications, including additional machining.
It may cause human injury and/or an accident.
1. Leakage voltage
Take note that the leakage voltage will increase when a
resistor is used in parallel with switching element or a C-R
circuit (surge voltage suppressor) is used for protecting a
switching device because of the passing leakage voltage
through the C-R circuit. The suppressor residual leakage
voltage should be as follows.
DC coil: 3% or less of rated voltage
AC coil:15% or less of rated voltage
VG342 Series
3 Port Solenoid Valve / Precautions 1
Be sure to read before handling.
Warning
Caution
