Valve assembly having a pressure balanced segment seal

Details Valve assembly having a pressure balanced segment seal Valve assembly having a pressure balanced segment seal

2007-05-01

2007-05-01

Fetsuga, Robert M. (Department: 3751)

Valves and valve actuation

With means to increase head and seat contact pressure

Seat pressed to valve

Reexamination Certificate

active

10668819

ABSTRACT:
A plug valve assembly includes a plug and a segment seal assembly. The segment seal assembly is configured to reduce the differential pressure load across the segment seal assembly when the valve is closed. The segment seal includes an opening in fluid communication with a sealed vent region that is formed between the segment seal and the plug.

REFERENCES:
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patent: 2506097 (1950-05-01), Melichar
patent: 3479006 (1969-11-01), Brown
patent: 3647181 (1972-03-01), Hulslander
patent: 3765646 (1973-10-01), Hulslander et al.
patent: 4022427 (1977-05-01), Read
patent: 4385747 (1983-05-01), Renaud, Jr. et al.
patent: 4796858 (1989-01-01), Kabel
patent: 5947443 (1999-09-01), Shellenbarger et al.
patent: 6554249 (2003-04-01), Pang et al.
patent: 2002/0179876 (2002-12-01), Pang et al.
“The American Heritage Dictionary”, Second College Edition, Houghton Mifflin Co., p. 332.

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