Knife gate valve with semi-hard, resilient seat

Details Knife gate valve with semi-hard, resilient seat Knife gate valve with semi-hard, resilient seat

1985-11-15

1987-11-03

Schwadron, Martin P.

Valves and valve actuation

Reciprocating valve

Gate

F16K 302

Patent

active

047039159

ABSTRACT:
A knife gate valve comprises a body member to which two aligned conduits are attached. The body member has a U-shaped internal recess of predetermined length formed within it. A removable sealing member fits within the recess and extends along its entire length. The sealing member includes a bearing portion and a resilient backing portion that are positioned face-to-face to each other. The bearing portion comprises a flexible plastic-type material having a self-lubricating, semi-hard surface that contacts the blade portion of the gate as it slides along the length of the recess to close the valve. The resilient backing member comprises an elastomer strip that contacts the bearing portion surface that is opposite to the blade portion contacting surface. The resilient backing portion yields to the pressure exerted by the gate as it closes, thereby to provide a tight seal for the valve.

REFERENCES:
patent: 2329315 (1943-09-01), Allen
patent: 2669416 (1954-02-01), Hilton
patent: 2829862 (1958-04-01), Wey
patent: 2851051 (1958-09-01), Englert et al.
patent: 3401915 (1968-09-01), Kim
patent: 3463447 (1969-08-01), Ripert
patent: 3636824 (1972-01-01), Clark
patent: 3897043 (1975-07-01), McBain et al.
patent: 4151999 (1979-05-01), Ringel et al.
patent: 4190259 (1980-02-01), Zitting
patent: 4206930 (1980-06-01), Thrane et al.
patent: 4377274 (1983-03-01), Mayhew, Jr.

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