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)
Do not use tools on the pressure regulator knob as this may cause damage. It must be operated
manually.
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 0.05 MPa or more.
(4)
Outlet pressure may rise when the inlet pressure is discharged and resupplied after pressure
setting. In this case, consume 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 it 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 together pipes and fittings, etc., be certain that chips from the pipe threads and
sealant do not get inside the pipe. 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 leads to cause of loosening or sealing failure, and excessive
tightening torque leads to cause of breakage of screws. Tightening without holding female thread
applies an excessive force to the piping bracket directly, leading to breakage.
Recommended tightening torque
Unit: N m
Thread size
1/8
1/4
3/8
1/2
3/4
1
Torque
7 to 9
12 to 14 22 to 24 28 to 30 28 to 30 36 to 38
(4)
Before using an SMC fitting and S coupler, please refer to "Tightening the threaded portion of the
connection thread" of the Fittings & Tubing Precautions.
(5)
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 breakage. Non-flexible piping like steel tube is
susceptible to excessive moment load or vibration. Insert flexible tubes to prevent this.
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