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No.VQC1000V-OMM0002-B
Caution
Design / Selection
1. Confirm the specifications
Products represented in this catalog 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 (such as the installation of a
cover or the restricting of access to the product) to prevent
potential danger caused by actuator operation.
3. Intermediate stops
●
Rubber seal: Use a closed center type valve.
●
Metal seal: For the exhaust center type valve, use in
combination with either a double check spacer or a double check
block.
●
For the 3-position closed center, it is difficult to make the piston
stop at the required position accurately due to the compressibility
of air.
Furthermore, since valves and cylinders are not guaranteed for
zero air leakage, it may not be possible to hold a stopped position
for an extended period of time.
However, as the metal seal closed center type valve leaks more
air than the rubber seal, the intermediate stopping time will be
shorter.
4. Effect of back pressure when using a manifold.
Use caution when valves are used on a manifold because
actuators may malfunction due to back pressure.
Especially when using a 3-position exhaust center valve or a
single acting cylinder, take appropriate measures to prevent
malfunction by using it with an individual EXH spacer assembly, a
back pressure check valve, or an individual exhaust manifold.
5. Holding pressure (including vacuum).
Since the valve are subject to air leakage, they cannot be used
for applications such as holding pressure (including vacuum) in a
pressure vessel.
6. Not suitable for use as an emergency shut-off
valve, etc.
The valves listed in this instruction 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.
7. Release of residual pressure
For maintenance and inspection purposes install a system for
releasing residual pressure. Especially in the case of the
3-position closed center valve, ensure that the residual pressure
between the valve and the cylinder is released.
8. 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.
9. 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.
10. Double solenoid type
When using the double solenoid type for the first time, actuators
may travel in an unexpected direction depending on the switching
position of the valve. Implement measures to prevent any danger
from occurring when operating the actuator.
11. 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.
12.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. Therefore, if the valve is to be energized for periods
of longer than 30 minutes at a time or if during the hours of
operation the energized period per day is longer than the
de-energized period, we advise using a valve with specifications
listed below.
・
A 0.4 W or lower valve, such as the SY series, or a valve with a
power-saving circuit
If conflicting instructions are given in the “Specific Product
Precautions” or on the “How to Order Valves” page, give them
priority.
13.Do not disassemble the product of make any
modifications, including additional machining.
Doing so may cause human injury and/or an accident..
14. Resumption after a long period of holding time
When resuming operation after a long period of holding time,
there are cases in which, regardless of whether the product is in
an ON or OFF state, there is a delay in the initial response time
due to adhesion. Conducting several cycles of running-in
operation will solve this problem. Please consider implementing
this before resumption.
1. Precautions for 2-position double solenoid
valves
If a double solenoid valve is operated with momentary
energization, it should be energized for at least 0.1 seconds.
However, depending on the piping conditions, the cylinder may
malfunction even when the double solenoid valve is energized for
0.1 seconds or longer. In this case, energize the double solenoid
valve until the cylinder is exhausted completely.
2. Leakage voltage
Take note that the leakage voltage will increase when a resistor is
used in parallel with a switching element or when a C-R circuit
(surge voltage suppressor) is used for protecting a switching
device because of the leakage voltage passing through the C-R
circuit. The suppressor residual leakage voltage should be as
follows.
DC coil
Should be 3% or less of the rated voltage.
VQC1000/2000 Series
Precautions for 5 Port Solenoid Valve
①
Be sure to read before handling.
Warning