Differential pressure sensing valve

Details Differential pressure sensing valve Differential pressure sensing valve

1974-11-06

1977-03-01

Cohan, Alan

Motors: expansible chamber type

With motive fluid valve

For double-acting motor

91363A, 91447, 91459, 137106, 13759614, F15B 2000

Patent

active

040096424

ABSTRACT:
A differential pressure sensing valve has an axially shiftable spool including axially-spaced spool areas on which a pair of pressure sources connectable with such valve act in a predetermined direction with spool shifting force. Biasing means normally biases such spool with spool shifting force in a direction opposite to the predetermined direction. The opposite spool shifting forces are substantially balanced over the normal operating range of the pressure sources for maintaining such spool in an operating position for normal flow of fluid through the valve. Such opposite spool shifting forces are substantially unbalanced for shifting such spool out of such operating position when the pressure sources substantially deviate from their normal operating range.

REFERENCES:
patent: 2964059 (1960-12-01), Geyer
patent: 3429225 (1969-02-01), Keyworth
patent: 3438306 (1969-04-01), Kazmarek
patent: 3540350 (1970-11-01), Heine
patent: 3915427 (1975-10-01), Swogger
patent: 3942550 (1976-03-01), Orme

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