Cryogenic butterfly valve with bi-directional sealing capability

Details Cryogenic butterfly valve with bi-directional sealing capability Cryogenic butterfly valve with bi-directional sealing capability

1981-11-16

1983-07-19

Weakley, Harold W.

Valves and valve actuation

With means to increase head and seat contact pressure

Seat pressed to valve

251306, F16K 2500

Patent

active

043940030

ABSTRACT:
A valve seal for a cryogenic butterfly valve comprising a reclining U-shaped resilient seal with the annular edge of the longer radially outer leg being gripped in the valve body to form a static seal. Pressure in one direction acts around the outer surface of the seal to pivot it about the static seal against the valve disc. Pressure in the other direction acts between the legs of the seal ring and, because the seal is restrained by the valve body against pivoting away from the valve disc, the pressure separates the legs to bias the radially inner leg inwardly against the valve disc.

REFERENCES:
patent: 3077331 (1963-02-01), Burtis
patent: 3650508 (1972-03-01), Kosmala
patent: 3734457 (1973-05-01), Roos
patent: 4005848 (1975-02-01), Eggleston

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