Valves and valve actuation – With means to increase head and seat contact pressure – Seat pressed to valve
Patent
1975-05-20
1976-10-19
Weakley, Harold W.
Valves and valve actuation
With means to increase head and seat contact pressure
Seat pressed to valve
251307, 251210, F16K 122
Patent
active
039866998
ABSTRACT:
A positive shut-off seal mechanism for use in pressurized fluid systems subject to high temperatures or fire risk. The seal mechanism includes a metallic valve seat in the form of an annular thin-walled skirt-like lip, preferably formed in a valve seat insert ring or retaining ring, the lip extending generally upstream toward the high pressure side of the valve. The edge of the lip engages a mating circumferential sealing surface of a valve disc, preferably at a location downstream from the plane of maximum disc diameter, with an interference fit to provide a preloaded radial sealing force between the edge of the lip and the sealing surface of the disc. The annular lip preferably forms the downstream side of an undercut groove for a resilient seal ring that provides a primary seal, the engagement of the lip edge with the sealing surface of the valve member providing a metal-to-metal backup seal in the event of damage to or destruction of the resilient seal ring. The valve disc material has preferably a coefficient of thermal expansion at least equal to that of the annular lip to maintain or increase sealing effectiveness with increasing temperature.
REFERENCES:
patent: 2913218 (1959-11-01), Broz
patent: 3156445 (1964-11-01), Swain
patent: 3282558 (1966-11-01), Swain
patent: 3556476 (1971-01-01), Haeuky
patent: 3591133 (1971-07-01), Miles
patent: 3642248 (1972-02-01), Benware
patent: 3650508 (1972-03-01), Koswala
patent: 3834663 (1974-09-01), Donnelly
Azzinaro James P.
Burdick John E.
Wucik, Jr. Joseph A.
Posi-Seal International, Inc.
Weakley Harold W.
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