Fluid handling – Systems – Flow path with serial valves and/or closures
Patent
1987-08-07
1988-12-13
Chambers, A. Michael
Fluid handling
Systems
Flow path with serial valves and/or closures
137510, 251 3002, F16K 3142
Patent
active
047903520
ABSTRACT:
A slow opening and fast closing gas valve includes a valve seat and a valve closure member arranged to respond to a gas pressure to seal aganst the valve seat to close the valve to an input gas flow therethrough. In order to open the valve, the gas exerting the gas pressure for sealing the valve closure member against the valve seat is allowed to bleed-off through a fixed restriction while the input gas is allowed to urge the valve closure member away from the valve seat to provide a slow opening of the input gas flow path through the valve. In order to close the input gas path through the valve, the input gas pressure is applied to the valve closure member to assist a closure spring in urging the valve closure member against the valve seat to produce a fast closure of the valve. A second valve is arranged to selectively control the flow path of the gas being bled off from the valve closure member to provide an unrestricted flow path or a restricted flow path through the fixed restriction. The restricted flow path is used during the opening of the gas valve while the unrestricted flow path is used during a closing of the gas valve.
REFERENCES:
patent: 3090592 (1963-05-01), Fleer
patent: 3300174 (1967-01-01), Urban et al.
patent: 3304002 (1967-02-01), Grayson
patent: 3447775 (1969-06-01), Katchka et al.
patent: 3525355 (1970-08-01), Katchka
patent: 3526360 (1970-09-01), Ray
patent: 4254796 (1981-03-01), Kelly
Dietiker Paul
Johnson Frederick W.
Blinn Clyde C.
Chambers A. Michael
Fox John C.
Halista Mitchell J.
Honeywell Inc.
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