VP31
∗
5 Series
3 Port Solenoid Valve
Precautions 1
Be sure to read this before handling products.
Design/Selection
1. Confirm the specifications.
This product is designed only for use in compressed air
systems (including vacuum). Do not operate at pressures,
temperatures, etc., beyond the range of specifications, as this
can cause damage or malfunction. (Refer to the catalog)
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 (such as the installation of a
cover or the restricting of access to the product) to prevent
potential danger caused by actuator operation.
3. Holding pressure (including vacuum)
Since 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 presented in this catalog are not designed for
safety applications (e.g. emergency shutoff valve). If the valves
are used in such applications, additional safety measures
should be adopted.
5. Release of residual pressure
For maintenance and inspection 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
supply a constant supply of vacuum. Failure to do so may
result in foreign matter sticking to the adsorption pad or air
leakage, causing the workpiece to drop.
7. Regarding vacuum switch valves and vacuum
release valves
If a non-vacuum valve is installed in the middle of a piping
system that contains a vacuum, the vacuum condition will not
be maintained. Use a valve designed for use under vacuum
conditions.
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
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 assembly. This will likely
adversely affect the performance of the valve and any
nearby peripheral equipment.
10. 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 (VP31*5V series:
Vacuum Specification)”.
1. Leakage voltage
When C-R device (surge voltage suppressor) is used for the
protection of switching device, the voltage leakage be
increased by current passing through the C-R device.
Therefore, select a circuit or device suitable to keep residual
voltage leakage within the value described below. If the
voltage leakage causes recover failure, set up a bleeder
resistance in the circuit or device. For further information of the
bleeder resistance, contact SMC.
DC coil
5% or less of the rated voltage
AC coil
15% or less of the rated voltage
2. Surge voltage suppressor
The surge voltage suppressor built into the valve is intended to
protect the output contacts so that the surge generated inside
valve does not adversely affect the output contacts. Therefore,
if an overvoltage or overcurrent is received from an external
peripheral device, the surge voltage protection element inside
the valve is overloaded, causing the element to break. In the
worst case, the breakage causes the electric circuit to enter
short-circuit status. If energizing continues while in this state, a
large current flows. This may cause secondary damage to the
output circuit, external peripheral device, or valve, and may
also cause a fire. So, take appropriate protective measures,
such as the installation of an overcurrent protection circuit in
the power supply or a drive circuit to maintain a sufficient level
of safety.
3. Continuous energization
If the valve remains energized for long period, switch the valve
off at least once a day.
4. Instant energization
If the valve is to be energized instantly, energizing time (ON)
and de-energizing time (OFF) should be both 0.1 sec or more.
5. Operation in low temperature conditions
Valve use is possible to temperature to 0
o
C. Take appropriate
measures to avoid freezing or congealing of drain, water, etc.
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No.VP3145-OMM0002-B
