Plug valve

Details Plug valve Plug valve

1997-10-11

1999-09-07

Fox, John

Valves and valve actuation

With means to increase head and seat contact pressure

Spring

251214, F16K 518

Patent

active

059474432

ABSTRACT:
A gas distribution valve including a body defining an inlet and an outlet passage, a central well containing a cylindrical plug disposed for arcuate displacement therein and including a transverse thru-bore that can be rotated into and out of axial alignment with the flow passages of said body for opening and closing the valve respectively. Overmolded elastomeric seat seals are provided for superior sealing that are urged against the well walls by an arcuate leaf spring intervening between the seals and the plug and extending in a direction concentric with the plug. A cover plate secures the plug within in the well and there is afforded a fire seal ring providing bi-directional contact sealing operative to restrict gas flow during and after exposure to fire or other high temperature environment.

REFERENCES:
patent: 2418404 (1947-04-01), Greenlee
patent: 3130952 (1964-04-01), Meyer
patent: 3186680 (1965-06-01), Pool
patent: 3237642 (1966-03-01), Tomson
patent: 3360236 (1967-12-01), Hulslander
patent: 3647181 (1972-03-01), Hulslander
patent: 3765646 (1973-10-01), Hulslander et al.
patent: 3806087 (1974-04-01), Hulslander
patent: 4379557 (1983-04-01), Saka
patent: 4744390 (1988-05-01), Henry
patent: 4794944 (1989-01-01), Henry
patent: 4809949 (1989-03-01), Rakieski
patent: 4892320 (1990-01-01), Tuckmantel

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