Industrial Hydraulic - Pressure Control Valves

Unloading Relief Valves PCV7

General Description

General usage is in oil hydraulic circuits where a pressure regulator is required to automatically unload the pump by diverting the pump delivery to the reservoir at low pressure when the accumulator pressure reaches the adjusted maximum. When the accumulator pressure drops to the cut-in pressure (approximately 85% of adjusted maximum), this valve directs pump delivery to the accumulator and hydraulic system. An integral check valve prevents return flow from the accumulator through the unloading valve.

This valve may also be used with a double pump to deliver a large volume oil to the system at low pressure and a small volume at high pressure serving the same function as separate Unloading Valve and Check Valve.