w q e r w SMC 2 OUT 1 I N Working Principle When the inlet pressure (P1) is higher than the regulating pressure, the check valve w closes and operates as a normal regulator (Figure 1). When the inlet pressure (P1) is shut off and released, the check valve w opens and the pressure in the diaphragm chamber q is released into the inlet side (Figure 2). This lowers the pressure in the diaphragm chamber q and the force generated by the pressure regulator spring e lifts the diaphragm. Valve r opens through the stem, and the outlet pressure is released to the inlet side (Figure 3). A A Figure 1 Figure 2 Figure 3 Mounting and Adjustment 1. Set the regulator while verifying the displayed values of the inlet and outlet pressure gauges. Turning the regulator handle excessively can cause damage to the internal parts. 2. Do not use tools on the pressure regulator handle as this may cause damage. It must be operated manually. 1. Be sure to unlock the handle before adjusting the pressure and lock it after setting the pressure. Failure to follow this procedure can cause damage to the handle and the outlet pressure may fluctuate. . Pull the pressure regulator handle to unlock. (You can visually verify this with the “orange mark” that appears in the gap.) . Push the pressure regulator handle to lock. When the handle is not easily locked, turn it left and right a little and then push it (when the handle is locked, the “orange mark”, i.e., the gap will disappear). 1. When using the regulator between a solenoid valve and an actuator, check the pressure gauge periodically. Sudden pressure fluctuations may shorten the durability of the pressure gauge. Maintenance Orange mark Be sure to read before handling. Refer to front matter 43 for Safety Instructions and pages 365 to 369 for F.R.L. Precautions. Specific Product Precautions Warning Caution Warning OUT (Outlet pressure) IN (Inlet pressure) OUT (Outlet pressure) IN (Inlet pressure) Pressure in diaphragm chamber Inlet pressure (IN) Back flow Normal Pressure in diaphragm chamber Inlet pressure (IN) A-A 568 Series ARG20K/30K/40K