Hydraulic control arrangement

Details Hydraulic control arrangement Hydraulic control arrangement

1983-12-12

1987-04-28

Look, Edward K.

Power plants

Pressure fluid source and motor

Having condition responsive control in a system of distinct...

60427, 91445, 91448, F16D 3102

Patent

active

046603808

ABSTRACT:
A hydraulic control arrangement for regulating a lifting device in an agricultural vehicle has a proportionally operating regulating directional valve which includes a blocking unit, a control slider controlling said blocking unit and connected with a throttling valve so that its throttle slider during lifting operates as a pressure compensation valve and during lowering as a pressure reducing valve, and a spring associated with the throttle slider is only insignificantly stronger than the regulating spring in an adjusting device of an adjusting pump, so that during actuation of the throttle slider depending upon the high load pressure of a parallel-operating second hydromotor, the pressure differential required for the lifting stream at the control slider and the pressure differential acting during lowering in the first control conduit remain substantially constant.

REFERENCES:
patent: 4122865 (1978-10-01), Budzich
patent: 4413472 (1983-11-01), Lang

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