Drain devices in hydraulic control circuits

Details Drain devices in hydraulic control circuits Drain devices in hydraulic control circuits

1975-03-21

1976-05-04

Rosenthal, Arnold

Valves and valve actuation

Fluid actuated or retarded

Pilot or servo type motor

91461, 200 82R, F16K 31124

Patent

active

039542491

ABSTRACT:
The invention relates to drain devices in hydraulic control circuits, particularly for hydraulic ultrarapid release control of a circuit breaker. In order to enable rapid decompression and draining of high pressure fluid in an hydraulic jack which controls the circuit breaker, a plurality of drain valves are mounted directly on the jack in a cascade arrangement. The valves are hydraulically controlled by oil pressure on pilot jacks and are of progressively increasing cross-sectional areas. All the valves in cascade are physically coupled to one another and the setting to drain of the valve with the smallest cross-section is controlled by an electrovalve.

REFERENCES:
patent: 1767037 (1930-06-01), Anderson
patent: 2491112 (1949-12-01), Jansson
patent: 2676779 (1954-04-01), Boden et al.
patent: 2972337 (1961-02-01), Coggeshall et al.
patent: 3353453 (1967-11-01), Ramspeck
patent: 3684236 (1972-08-01), Lewis

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