Valves and valve actuation – Fluid actuated or retarded – Pilot or servo type motor
Patent
1988-08-31
1991-08-13
Walton, George L.
Valves and valve actuation
Fluid actuated or retarded
Pilot or servo type motor
251 3005, 251 44, 25112908, 13759616, F16K 3106, F16K 31124
Patent
active
050390694
ABSTRACT:
A dual electromagnetically actuated valve device for controlling the connection between a fluid pressure source and a consumer facility, and for controlling the pressure relief function for the consumer facility, and for providing a highly sensitive adjustment of the consumer pressure. The device operates with a high flow rate when the pressure difference between inlet pressure and consumer pressure is great, but prevents an overshoot or undershoot of the consumer pressure. The subject invention makes it possible to provide a sensitive adjustment of the consumer pressure in any normal consumer pressure range.
The invention controls the cross-sectional opening of a pilot control valve to be continuously adjustable by employing a first electromagnetic control valve which is responsive to a declining current dependent stroke characteristic, and a second electromagnetic control valve which is responsive to a rising current dependent stroke characteristic.
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Friederichs Otto
Lichtenberg Wolfgang
Kasper Horst M.
WABCO Westinghouse Fahrzeugbremsen
Walton George L.
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