Isolation valve with extended seal life

Details Isolation valve with extended seal life Isolation valve with extended seal life

1998-05-19

2000-05-02

Fox, John

Valves and valve actuation

With means to increase head and seat contact pressure

Gate valve

251193, 251196, F16K 318

Patent

active

060562676

ABSTRACT:
A gate valve assembly having a primary and secondary seating surface for preventing process fluids from contacting the seals of the valve is provided. Additionally, a purge gas inlet can be disposed in the valve body to prevent process gases from contacting the seals during operation. Still further, a primary and secondary barrier seal may be provided to prevent process gases from contacting the primary seal. Additionally, a purge gas inlet can be disposed between the primary and secondary seals to further prevent process gases from contacting the primary seal.

REFERENCES:
patent: 2150254 (1939-03-01), Sorensen
patent: 2192331 (1940-03-01), Schaefer
patent: 2776105 (1957-01-01), Schmitz
patent: 3554486 (1971-01-01), Thebado
patent: 3557822 (1971-01-01), Chronister
patent: 3765647 (1973-10-01), Grove et al.
patent: 4359203 (1982-11-01), Cho
patent: 4524796 (1985-06-01), Ayers, Jr. et al.
patent: 4664139 (1987-05-01), Pfeiffer
patent: 4895342 (1990-01-01), Feild
patent: 5232199 (1993-08-01), Thrasher
patent: 5368276 (1994-11-01), Pfeiffer
patent: 5579718 (1996-12-01), Freerks

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