Valves and valve actuation – With means to increase head and seat contact pressure – Seat pressed to valve
Patent
1989-03-02
1989-08-29
Fox, John
Valves and valve actuation
With means to increase head and seat contact pressure
Seat pressed to valve
251180, F16K 122
Patent
active
048609943
ABSTRACT:
A seal system for butterfly valves of concentric- or eccentric valve body closure, which comprises a circumferential receptacle groove formed around the circumference of the valve body; a seal metal extending over the circumference of the valve body and having curved outer ridge face, arranged inserted in said receptacle groove on the circumference of valve body so as to permit its radial displacement; a stripe of seat metal suitable for receiving said curved outer face of said seal metal upon closure of the butterfly valve to effect a fluid tight seal, said seat metal protruding from the casing inner face with its front face inclining relative to the axis of the valve casing to permit a tight fit thereof with said outer ridge of said seal metal, wherein a buffer ring having a sectional form permitting a resilient deformation, such as a C-shape, is inserted in said circumferential receptacle groove of valve body between the groove bottom and said seal metal in order to effect a resilient support of said seal metal.
REFERENCES:
patent: 2058996 (1936-10-01), Kollberg
patent: 3166291 (1965-01-01), Grove
patent: 3275289 (1966-09-01), Fawkes
patent: 3282558 (1966-11-01), Swain
patent: 4483511 (1984-11-01), Kushida et al.
patent: 4632360 (1986-12-01), De Salve
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