Gate valve

Details Gate valve Gate valve

1991-11-26

1994-06-14

Schwadron, Martin P.

Valves and valve actuation

With means to increase head and seat contact pressure

Seat pressed to valve

251174, F16K 316

Patent

active

053203275

ABSTRACT:
A gate valve [10] is disclosed having a secondary seal, wherein the gate [15] forms a metal to metal seal with the seat [29, 134] and wherein a resilient seal [36a] is moved toward the gate [15] in a closed position to form a secondary fluid-tight seal with the gate [15]. A device [31, 34] for deenergizing the secondary seal is provided in order to prevent wear of the secondary seal upon opening of the gate and also to reduce the gate [15] drag caused by the energized secondary seal. Also disclosed is a pressure relief mechanism [40, 141] for the secondary seal adapted to prevent damage to the seal and a mechanism for evenly applying opposing secondary seals.

REFERENCES:
patent: 3121553 (1964-02-01), Grove
patent: 3339886 (1967-09-01), Grove
patent: 3504885 (1970-04-01), Hulsey

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