Slow opening and fast closure gas valve

Details Slow opening and fast closure gas valve Slow opening and fast closure gas valve

F - Mech Eng,Light,Heat,Weapons

23

N

137/38

F23N 5/10 (2006.01)

Patent

CA 1296237

APPLICATION OF PAUL DIETIKER AND FREDERICK W. JOHNSON SLOW OPENING AND FAST CLOSURE GAS VALVE 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 against the valve seat to close the valve to an input gas f low 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 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. The restricted flow path is used during the opening of the valve while the unrestricted flow path is used during a closing of the valve.

571373

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