Droop compensated bypass valve

Details Droop compensated bypass valve Droop compensated bypass valve

1991-06-14

1992-01-07

Cohan, Alan

Fluid handling

Self-proportioning or correlating systems

Self-controlled branched flow systems

G05D 701

Patent

active

050781731

ABSTRACT:
A droop compensated bypass valve for use with a metering system having a high pressure fluid supply line, a metering valve connected to the high pressure supply line, and a low pressure supply line connected to the metering valve. The bypass valve includes a body defining a valve chamber, a piston slidably mounted in the valve chamber and including a head dividing the chamber into high and low pressure volumes, the high pressure volume being connected to the high pressure fluid supply line and the low pressure volume being connected to the low pressure supply line. The valve body includes a bypass line connecting the high pressure volume to a low pressure fluid source. A spring urges the piston toward the high pressure volume against high pressure fluid pressure from the high pressure line to cover and progressively shut off the bypass line. The piston includes an orifice therethrough connecting the high and low pressure volumes, and a diaphragm, connected to the spring, which deflects as the piston is displaced toward the low pressure volume thereby progressively closing the piston orifice such that a pressure diferential across the piston varies with the spring force exerted against the piston, thereby compensating for variations in the force applied by the spring as the piston changes position in the chamber.

REFERENCES:
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patent: 2917067 (1959-12-01), Pearl
patent: 2934138 (1960-04-01), Warne
patent: 3106934 (1963-10-01), Rogers et al.
patent: 3128783 (1964-04-01), Cowles et al.
patent: 3465778 (1969-09-01), Kast
patent: 3532106 (1970-10-01), Greune et al.
patent: 4343324 (1982-08-01), Ohe
patent: 4458713 (1984-07-01), Wernberg
patent: 4505293 (1985-03-01), Strange
patent: 4724919 (1988-02-01), Adams

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