Fluid handling – Liquid level responsive or maintaining systems – By float controlled valve
Patent
1981-03-27
1982-09-28
Nilson, Robert G.
Fluid handling
Liquid level responsive or maintaining systems
By float controlled valve
60413, F15B 102
Patent
active
043513573
ABSTRACT:
A compensator for use with a hydraulic control valve connected to a source of high fluid pressure provides the functions of a low pressure return line accumulator and controllable check valve. A spring loaded piston (66) in a housing (64) has a working face exposed to fluid pressure downstream of the power control unit (10). A poppet valve (80) movable in a bore (78) on the axis of the piston is spring loaded against a seat (82) in the return line (40, 42) to interrupt flow between the downstream side of the power control unit (10) and the return side of the fluid pressure source. When normal return line pressure is sensed, the piston (66) moves against its spring (68) to permit the housing (64) to be substantially filled with fluid. Further increases in fluid pressure cause the piston (66) to contact and open the poppet (80) and permit flow to the return side (42) of the fluid pressure source. A working area (92) is formed on a part of the poppet (80) to the outside of the seat which area is exposed to the fluid pressure downstream of the power control unit (10). Should the piston (66) stick or seize in the housing (64), the fluid pressure acting against this working area (92) would increase to some value significantly above the normal pressure at which point it becomes sufficient to open the poppet (80), thus preventing the power control unit (10) from jamming or becoming hydraulically locked in position.
REFERENCES:
patent: 2366382 (1945-01-01), Burton
patent: 3188916 (1965-06-01), Beatty
patent: 4197785 (1980-04-01), Weber
Nilson Robert G.
Smith Robert C.
The Bendix Corporation
Thornton William F.
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