Valves and valve actuation – Rotary valves – Butterfly
Patent
1995-02-08
1996-01-09
Fox, John C.
Valves and valve actuation
Rotary valves
Butterfly
251305, 251367, F16K 122
Patent
active
054822521
ABSTRACT:
A seat ring is resiliently fitted into upper and lower main bodies of a butterfly valve divided in a horizontal direction of piping so as to prevent a fluid from being leaked from the butterfly valve. The seat ring has a cylindrical portion for storing a valve body of the butterfly valve and constructed such that both end faces of the cylindrical portion respectively come in contact with two flanged annular adapters of the butterfly valve; two valve rod holes opposed to each other and formed in the cylindrical portion such that a valve rod for pivotally supporting the valve body extends through the valve rod holes: two first projecting portions having an annular shape and a rectangular shape in cross section and respectively projecting from an outer circumferential face of the cylindrical portion onto an outer side in a diametrical direction at both end edges of the cylindrical portion: a first chamfer formed in the range of a first angle around each of the valve rod holes: and a second chamfer formed in the range of an angle except for the first angle. A third chamfer is gradually connected between the first and second chamfers.
REFERENCES:
patent: 5018704 (1991-05-01), McLennan
patent: 5236003 (1993-08-01), Habicht
patent: 5360030 (1994-11-01), Sish
Fox John C.
Tomoe Technical Research Company
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