Adjustment
Warning
(1) Adjust the set pressure ensuring correct inlet and outlet pressures. Turning the knob excessively
can cause damage to the internal parts.
(2) Operate the knob by hand. Tools may break the knob.
Caution
(1) For the product with a pressure gauge, do not apply pressure exceeding the maximum scale of the
pressure gauge in order to protect the gauge.
(2) Adjust the pressure whilst the pressure is increasing. Pressure may become lower than the set
pressure if adjusted by decreasing the value. Rotate the knob clockwise to increase the set
pressure. Counterclockwise to decrease the pressure. Moreover, please lock the knob after setting
pressure.
(3) For the regulator with backflow function, upstream pressure needs to be higher than downstream
pressure by 0.05MPa or more.
(4) Outlet pressure may rise when the inlet pressure is discharged and resupplied after pressure
setting. In this case, allow flow of air through the product by consuming air at the outlet, which will
bring the pressure closer to the set pressure.
(5) Outlet pressure may change if the product is used for a long period of time. Please confirm the set
pressure regularly.
(6) When pressure difference between the inlet side and the outlet side is large, chattering may occur.
In that case, please reduce the pressure difference between the inlet and the outlet. Please consult
SMC if chattering continues.
Piping
Warning
(1) Before piping is connected, it should be thoroughly blown out with air (flushing) or washed to
remove chips, cutting oil and solid foreign material from inside the pipe. Contamination of piping
may cause damage or malfunction.
(2) When screwing piping or fittings into ports, ensure that chips from the pipe threads or sealing
material do not enter the product. When a sealant tape is used, leave 1.5 to 2 thread ridges
exposed at the end of the threads.
(3) Connect piping/fittings using the recommended torque while holding the female thread side tightly.
Insufficient tightening torque can cause loose piping or sealing failure. Excess tightening torque
may cause damage to threads. If the female side is not held while tightening, excessive force will be
applied to the bracket directly, causing breakage.
Recommended tightening torque (Unit: Nm)
Thread
1/8
1/4
3/8
1/2
Torque
7 to 9
12 to 14
22 to 24
28 to 30
(4) Do not apply torsion or bending moment other than the weight of the product itself. External piping
needs to be supported separately as it may cause damage. Non-flexible piping like steel tube is
susceptible to excessive moment load or vibration. Insert flexible tubes to prevent this.
-5-
