Valve and seal

Details Valve and seal Valve and seal

1981-06-05

1983-02-08

Weakley, Harold W.

Valves and valve actuation

With means to increase head and seat contact pressure

Seat pressed to valve

251306, 251317, F16K 2500

Patent

active

043725309

ABSTRACT:
A butterfly valve is disposed in a valve body for sealing engagement with a resilient seat ring disposed in a tapered groove defined by the valve body and a retaining ring. A metallic back-up ring is disposed between two legs of the seat ring to support a sealing portion thereof when the valve is closed. Flanges on the legs retain the seat ring together with the backup ring in the groove. Parallel walls at the bottom of the groove insure seat ring and back-up ring retention. An "O" ring is disposed between the back-up ring, the flanges and the groove bottom and pressurized fluid passageways are provided to produce a two-way pressure assist for sealing.

REFERENCES:
patent: 3540696 (1970-11-01), Fawkes
patent: 4088299 (1978-05-01), Maciolaitis
patent: 4165859 (1979-08-01), Maciolaitis
patent: 4344632 (1982-08-01), Green

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