Shut-off valve providing pressure equalization

Details Shut-off valve providing pressure equalization Shut-off valve providing pressure equalization

2008-01-29

2008-01-29

Fox, John (Department: 3753)

Valves and valve actuation

Balanced valves

Reciprocating

Reexamination Certificate

active

11640086

ABSTRACT:
In accordance with the teachings of the present invention, a shut-off valve is disclosed that has particular application for opening and closing a high pressure compressed gas storage tank. In one embodiment, the valve includes a single sealing member and a bellows. High pressure is provided at inlet port to one side of the sealing member and a bellows chambers so that both sides of the sealing member are at high pressure to provide equalization. A spring bias is the sealing member against a valve seat in one direction. An electromagnetic coil is energized to draw the sealing member away from the valve seat against the bias of the spring.

REFERENCES:
patent: 3627257 (1971-12-01), Stampfli
patent: 4361309 (1982-11-01), Sogabe
patent: 4452267 (1984-06-01), Ott et al.
patent: 5168898 (1992-12-01), Gottling et al.
patent: 5992219 (1999-11-01), Otaka
patent: 0 770 775 (1997-05-01), None

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