Valves and valve actuation – Electrically actuated valve – Balanced valve
Patent
1998-05-29
2000-12-19
Shaver, Kevin
Valves and valve actuation
Electrically actuated valve
Balanced valve
25112908, 1374844, 91459, F16K 3102
Patent
active
061618152
ABSTRACT:
An hydraulic valve has a flow/pressure characteristic matched to that of a pump with which it is used. The valve has a housing with a fluid inlet in its side and an outlet at one end. A shuttle is movable along the housing under control of a proportional solenoid, to vary the amount by which an edge of the shuttle covers the inlet and thereby controls flow of fluid through the valve. The shuttle has a flange one end located between the inlet and outlet so that fluid flowing from the inlet to the outlet applies pressure to one side of the flange and displaces the shuttle to close the inlet. In this way, an increase in pressure tends to reduce the effective size of the inlet aperture to compensate for pressure variation.
REFERENCES:
patent: 3949964 (1976-04-01), Freeman
patent: 4062269 (1977-12-01), Chichester et al.
patent: 4313467 (1982-02-01), Lang
patent: 4714234 (1987-12-01), Falk et al.
patent: 5094218 (1992-03-01), Everingham et al.
Bonderer David A.
Shaver Kevin
Smiths Industries Public Limited Company
LandOfFree
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