Automatic hydraulic shut-off system

Details Automatic hydraulic shut-off system Automatic hydraulic shut-off system

1979-07-16

1981-06-23

Cohen, Irwin C.

Motors: expansible chamber type

With motive fluid valve

Relatively movable serial valves

137460, 137498, F15B 13042, F16K 1730

Patent

active

042743281

ABSTRACT:
An automatic hydraulic shut-off system for use with a hydraulic valve and a work apparatus which is retained under hydraulic pressure even when the hydraulic line is broken inadvertently. A lock valve is connected in the line and senses the loss of hydraulic pressure, and the valve is actuated in response to the pressure drop and retains the work apparatus in a pressurized condition to thereby avoid undesired movement in response to the loss of pressure.

REFERENCES:
patent: 740882 (1903-10-01), Locke
patent: 820598 (1906-05-01), Petersen
patent: 2012351 (1935-08-01), Riney et al.
patent: 2266533 (1941-12-01), Brisbane et al.
patent: 2566773 (1951-09-01), Otis
patent: 3502102 (1970-03-01), Maltby
patent: 3587393 (1971-06-01), Vick
patent: 4004607 (1977-01-01), Freese

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