Pressure flow compensating control circuit

Details Pressure flow compensating control circuit Pressure flow compensating control circuit

F - Mech Eng,Light,Heat,Weapons

04

B

138/56.1

F04B 49/00 (2006.01) F04B 1/10 (2006.01)

Patent

CA 1285194

PRESSURE FLOW COMPENSATING CONTROL CIRCUIT Abstract of the Disclosure A control circuit and specific embodiments thereof are provided using a four-port infinitely variable pilot operated pressure-compensator spool valve and a three-port infinitely variable pilot operated load sense spool valve in series to regulate the output pressure of a variable displacement radial piston pump. The valves are so constructed that both must be correctly positioned to put the pump into full stroke, while either valve can de-stroke the pump. The three-port valve is pilot controlled between the load sense pressure and the outlet pressure, while the four-port valve is controlled between the pump inlet and outlet pressures. A check valve and orifice are positioned between the two control valves and the crankcase control line of the pump to assist in stabilizing the pump output. A relief valve is provided on the crankcase line to minimize output spikes. In an alternative embodiment, a single three-port spool valve is controlled between the inlet and outlet pressures of the pump. A relief valve is provided to vent spikes in the crankcase pressure, allowing down-sizing of the crankcase orifice.

576204

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