Hydraulic control circuit and hydraulic control apparatus theref

Details Hydraulic control circuit and hydraulic control apparatus theref Hydraulic control circuit and hydraulic control apparatus theref

1992-02-04

1993-04-13

Look, Edward K.

Power plants

Pressure fluid source and motor

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

60468, 60494, 91516, 91532, F16D 3102

Patent

active

052011763

ABSTRACT:
A Hydraulic control circuit and a hydraulic control apparatus therefor are disclosed to preferentially feed fluid in a controlled amount or below to a first circuit system and feed fluid in an excessive amount exceeding the controlled amount to a second circuit system, and change over a pressure generated to a pilot pressure. Changing-over of control valves which are provided in the second circuit system permits a pilot pressure to be generated in the circuit. When any trouble occurs in the control valves, fluid fed to the second circuit system is unloaded, to thereby eliminate a possibility that an actuator is unexpectedly actuated.

REFERENCES:
patent: 3456560 (1969-07-01), Brannon
patent: 4773216 (1988-09-01), Ohashi et al.

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