Butterfly valve

Details Butterfly valve Butterfly valve

1991-05-16

1992-10-27

Fox, John C.

Valves and valve actuation

Rotary valves

Butterfly

251306, F16K 122

Patent

active

051582651

ABSTRACT:
At the outer-periphery contact portion of a butterfly disk of a butterfly valve, the sealing area closest to the shaft is formed smaller than other sealing areas. Thus, when the valve is closed by the butterfly disk, the outer-periphery contact portion of the butterfly disk almost simultaneously starts contacting a seat ring throughout the periphery because the area of the portion is smaller than other sealing areas. Therefore, the sealing effect for a long time is expected because the shaft is hardly scratched and the seat ring is hardly abraded.

REFERENCES:
patent: 3957073 (1976-05-01), Barnum
patent: 3960177 (1976-06-01), Baumann
patent: 4133513 (1979-01-01), Meyer
patent: 4712768 (1987-12-01), Herr et al.

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