1. If air leakage increases or equipment does
not operate properly, stop operation.
After mounting, repairs, or equipment modification, connect the
compressed air and power supplies, and perform appropriate
function and leakage inspections to confirm that the unit is
mounted properly.
2. Instruction manual
Mount and operate the product only after reading the manual
carefully and understanding its contents. Always keep the
manual handy for easy reference.
3. Painting and coating
Warnings or specifications printed or pasted on the product
should not be erased, removed or covered up.
Wiring
Mounting
Warning
Caution
1. Preparation before piping
Before piping is connected, it should be thoroughly flushed out
with air or washed out with water to remove chips, cutting oil
and other debris.
2. Wrapping of sealant tape
When connecting pipes and fittings, etc., be sure that neither
chips from the pipe threads nor sealing material get inside the
valve.
When using sealant tape, leave 1.5 to 2 thread ridges exposed
at the end of the pipe/fitting.
Piping
Caution
3. When using closed center type valves
When using closed center type valves, check carefully to make
sure there are no air leaks from the piping between the valves
and cylinders.
4. Ensure tightening to the prescribed tighten-
ing torques.
When screwing fittings into valves, tighten according to the
torques given below.
5. Connection of piping to products
When connecting piping to a particular product, refer to the
product's instruction manual to avoid mistakes regarding the
supply port and other connections as applicable.
Winding
direction
Sealant tape
Expose approx. 2 threads
1. Lubrication
1) The valve has been lubricated for life at the factory, and does
not require any further lubrication.
2) Should you wish to apply additional lubrication, however,
please be sure to use ISO VG32 Class 1 turbine oil (without
additives).
Please be aware, however, that once additional lubrication is
applied, it must be continued to avoid malfunctions, as the
new lubricant will completely cancel out the original
lubrication.
Lubrication
Caution
Connection thread
Rc 1/8
Rc 1/4
Rc 3/8
Rc 1/2
Rc 3/4
7 to 9
12 to 14
22 to 24
28 to 30
28 to 30
Proper tightening torque (N⋅m)
Tightening torques for piping
31
5-Port Solenoid Valve Precautions 2
Be sure to read before handling.
Series VQC
1. Polarity
Always confirm whether or not there is polarity when
connecting a power supply to a DC specification solenoid valve
equipped with a (light) voltage surge suppressor.
If there is a polarity, observe the following precautions:
• If there is no built-in diode for polarity protection:
Switching polarity by mistake poses the danger of burnout to
the valve's built-in diode and the switching element on the
control mechanism side, as well as to the power supply
mechanism.
• If there is a diode for polarity protection:
Switching polarity by mistake will cause the valve's switching
function to stop.
∗ Series VQ4000 has no polarity. (It is a polarity-free type valve.)
2. Applied voltage
Be careful to apply the proper voltage when connecting electric
power to the solenoid valve. Application of improper voltage
may cause malfunction or coil damage.
3. Confirm the connections.
After completing the wiring, confirm that all the connections are
correct.
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