Bi-directional knife gate valve apparatus and method

Details Bi-directional knife gate valve apparatus and method Bi-directional knife gate valve apparatus and method

2006-07-21

2008-12-02

Fristoe, Jr., John K (Department: 3753)

Valves and valve actuation

Reciprocating valve

Gate

C251S326000, C251S327000

Reexamination Certificate

active

07458559

ABSTRACT:
An improved method and apparatus for a valve assembly features a valve body, a first seat ring mounted in the valve body, a second seat ring mounted in the valve body, and a retractable blade gate slideable in between the first seat ring and the second seat ring. The gate is moveable between open and closed position. A first elastomeric ring is disposed in between the valve body and the first seal ring and projecting towards the gate blade. A second elastomeric ring is disposed in between the second seat ring and the valve body and projecting towards the gate blade.

REFERENCES:
patent: 3580541 (1971-05-01), Bouhot
patent: 4434967 (1984-03-01), Vanderburg
patent: 4519582 (1985-05-01), Freeman
patent: 4846442 (1989-07-01), Clarkson et al.
patent: 5836570 (1998-11-01), Blenkush et al.

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