Hydraulic control system having a bypass valve

Details Hydraulic control system having a bypass valve Hydraulic control system having a bypass valve

1996-06-27

1997-12-30

Michalsky, Gerald A.

Fluid handling

Systems

Supply and exhaust

91450, F15B 1308

Patent

active

057019339

ABSTRACT:
A hydraulic control system has a closed center control valve disposed to control flow of pressurized fluid from a pump to an actuator and a bypass valve disposed to control fluid flow through a bypass line connecting the pump to a reservoir. A controller connected to the control valve and the bypass valve is operative to controllably move the control valve toward an open, flow communicating position and the bypass valve toward a closed flow blocking position. A pressure compensating valve is disposed in the bypass line to maintain a predetermined pressure differential across the bypass valve when the pressure upstream of the bypass valve exceeds a predetermined level so that the flow through a area opening in the bypass valve is substantially commensurate with the opening at pressures above the predetermined level.

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