Valve seat assembly

Details Valve seat assembly Valve seat assembly

1989-04-14

1989-11-07

Fox, John

Valves and valve actuation

With means to increase head and seat contact pressure

Seat pressed to valve

251328, F16K 142

Patent

active

048786519

ABSTRACT:
A through conduit gate valve apparatus having a valve seat assembly that is field maintainable and which prevents the occurrence of pressure lock is disclosed. Each valve seat assembly includes a retainer ring fixed in the valve body and a pressure responsive seat ring that seals with the gate member. The seat ring is responsive to fluid pressure in the valve flow passageways for maintaining and enhancing the face seal with the gate and to fluid pressure in the valve chamber for automatically venting the valve chamber to prevent occurrence of a pressure lock condition.

REFERENCES:
patent: 3110470 (1963-11-01), Dumm
patent: 3305213 (1967-02-01), Grove
patent: 3446476 (1969-05-01), Scaramucci
patent: 3834664 (1974-09-01), Atkinson
patent: 4083376 (1978-04-01), Alaniz
patent: 4226258 (1980-10-01), Nakanishi
patent: 4434967 (1984-03-01), Vanderburg

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