Unidirectional seat seal for gate valve

Details Unidirectional seat seal for gate valve Unidirectional seat seal for gate valve

1992-07-30

1993-03-09

Fox, John C.

Valves and valve actuation

Reciprocating valve

Gate

73 498, F16K 300

Patent

active

051920514

ABSTRACT:
A gate valve has seat seals located in a cavity between seat rings and a counterbore formed in the flow passage. The seat seals block flow from an inner to an outer direction, but allow flow in the opposite direction. The seat seals are held in position by standoff rings. Flowby passages in the standoff rings assure that the standoff rings will not seal when a surge of test pressure is applied to the seal in a direction opposite to the normal direction that it encounters flow.

REFERENCES:
patent: 3803901 (1974-04-01), McConnell et al.
patent: 4161309 (1979-07-01), Klyce
patent: 4741509 (1988-05-01), Bunch et al.

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