Rotary valve top seal assembly

Details Rotary valve top seal assembly Rotary valve top seal assembly

1977-09-06

1979-07-03

Schwadron, Martin P.

Valves and valve actuation

Mechanical movement actuator

Particularly packed or sealed

277190, 277206R, F16k 3144

Patent

active

041598180

ABSTRACT:
In a rotary valve, such as a plug valve having a body cavity opening from the top, a top seal assembly includes a membrane of polytetrafluoroethelene or the like which extends over the cavity opening with its outer edges clamped between the valve body and a top closure. A groove around the opening accommodates cold flow of material from between the clamped surfaces beyond it. A circular opening in the membrane embraces and seals around the valve stem and an underturned lip around the opening engages against a generally horizontal sealing surface around the plug stem to be urged into sealing engagement by a load ring, providing a second, pressure augmented annular seal.

REFERENCES:
patent: 254736 (1882-03-01), Van Tine
patent: 1789594 (1931-01-01), Oven
patent: 2783106 (1957-02-01), Barnhart
patent: 3192942 (1965-07-01), Manor et al.
patent: 3235272 (1966-02-01), Smith
patent: 3371676 (1968-03-01), Mullaney
patent: 3540740 (1970-11-01), Smith
patent: 3552716 (1971-01-01), Hoos

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