Pilot Operated Relief Valves

　　These valves protect the hydraulic system from excessive pressure, and can be used to maintain constant pressure in a hydraulic system. Remote control and unloading are permitted by using vent circuits.

Graphic Symbols

 

　　一、Model Number Designation

Use high venting pressure type to reduce the response time from unload to onload.

　　Instructions

　　1. Remote control relief valve is used in the vent circuit. If the internal volume of the vent line is too large, chattering is likely to occur. Thus, as far as possible reduce the inside diametre and the length of the pipe.
 

　　2. To adjust the pressure, loosen the lock nut and turn the handle slowly clockwise for higher pressures or anti-clockwise for lower pressures. After adjustments, do not forget to tighten the lock nut.
 

　　3. Piping of the tank line should not be connected to any tank line of the other valves, but connected directly to the reservoir.
 

　　4. With a small flow, the setting pressure may be unstable. Use models numbered 03 and 06 with a flow rate above 8 L/min (2.1 U.S. GPM) and model 10 with 15 L/min (4.0 U.S. GPM).

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