Valves and valve actuation – Rotary valves – Butterfly
Patent
1996-02-08
1997-12-09
Fox, John
Valves and valve actuation
Rotary valves
Butterfly
251306, F16K 122
Patent
active
056951701
ABSTRACT:
There is disclosed a butterfly valve having a body connectable in a flowline and a seat which lines its inner side, and a disc which has stem portions at its opposite ends closely received within openings in the seat and body to permit the disc to be rotated between opened and closed positions. A ring which is restrained from movement with one of the disc and seat in a direction transverse to the stem portions substantially fills a groove in the other of the disc and seat which surrounds each stem portions so as to seal between the seat, disc and such stem portion.
REFERENCES:
patent: 2994342 (1961-08-01), Stillwagon
patent: 3447780 (1969-06-01), Holson, Jr.
patent: 3776509 (1973-12-01), Lebland
patent: 4754530 (1988-07-01), Eff
Dernovsek John R.
Gent David W.
Bray International, Inc.
Fox John
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