Gate valve

Details Gate valve Gate valve

1994-01-03

1995-08-29

Schwadron, Martin P.

Valves and valve actuation

With means to increase head and seat contact pressure

With positive reduction

251167, 251172, 251174, 251203, F16K 2500

Patent

active

054453593

ABSTRACT:
A gate valve [10] is disclosed having a primary [300, 302] and secondary [316] seal on the upstream and downstream sides of the gate [15], wherein the gate [15] forms a seal with the seat [300] which is activated mechanically [320] and is fluid powered, and wherein a resilient seal [316a] is moved toward the gate [15] by mechanical actuation [31 ] to form a fluid powered secondary fluid-tight seal with the gate [15].

REFERENCES:
patent: 4280522 (1981-06-01), Peshnyo

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