Butterfly valve

Details Butterfly valve Butterfly valve

1975-10-02

1977-12-20

Weakley, Harold W.

Valves and valve actuation

With means to increase head and seat contact pressure

Seat pressed to valve

251306, F16K 2500

Patent

active

040637093

ABSTRACT:
The valve is of the type having a body and a butterfly valve closure member. One of these parts has an annular sealing element which is retained in a cavity with which it defines an annular chamber. The other part has an annular surface for contacting the sealing element when the valve is closed. A conduit puts the chamber in communication with the upstream side of the closure member when the latter is in its valve closing position. According to the invention, an exhaust conduit is provided for putting the chamber in communication with the downstream side of the closure member when, and only when, the closure member is not in its valve closing position.

REFERENCES:
patent: 2863630 (1958-12-01), Broz
patent: 2982305 (1961-05-01), Grove
patent: 3216695 (1965-11-01), Bartholet
patent: 3409269 (1968-11-01), Fawkes
patent: 3612483 (1971-10-01), Pool
patent: 3834663 (1974-10-01), Donnelly

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