NEC PC-9821XB10 Vector signal module

These relief modules limit system pressure by directing pump flow to tank when system pressure reaches the setting of the module and thus preventing overloading of the system. In addition to conventional overload relief module operation, two other features are provided: System pressure may be limited to relatively low venting pressure by directing flow from the vent connection to tank. System pressure may be remotely controlled by directing flow form the vent connection to a remote control pressure relief valve Pressure Setting The pressure setting of the relief module selected should be approximately 10 to 14 bar (150 to 200 psi) above the actual system working pressure. A higher setting will waste power and impose unnecessary strains on the pump and other system components

Pressure Adjustment 

Pressure is adjusted by loosening the jam nut and turning the adjusting screw. Clockwise rotation increases pressure, counterclockwise rotation decreases pressure.Both must be piped directly to tank through a surge-free line. Tank line applications where back pressure is required to provide pilot pressure for the open center DG valve spool, may have back pressure, but not to exceed 5 bar (75 psi). Any back pressure on the tank line must be added to the relief valve setting. Drain line (Y port) must be piped so there will be no back pressure at this port. Transient pressure must not exceed 0,35 bar (5 psi).

General Data 

These valves are generally used for applications requiring an electrically controlled adjustable pressure relief or regulating valve to limit the pressure in an oil circuit to the desired maximum. The valves provide a wiring cavity located in the DG4V pilot directional valve. A ground terminal is provided as shown.An indicator light is available with most voltages. The light is “on” when there is current at the solenoid. On spring offset models, light is on solenoid “a” end only. The conduit connection readily adapts to connector-receptacle assemblies on the market.

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