Valves and valve actuation – Rotary valves – Plug
Reexamination Certificate
2002-02-14
2003-12-02
Hirsch, Paul J. (Department: 3754)
Valves and valve actuation
Rotary valves
Plug
C251S356000
Reexamination Certificate
active
06655658
ABSTRACT:
This invention relates to a plug valve assembly for controlling the flow of a high pressure fluid.
Plug valve assemblies are well known in the art and feature a valve member rotatably mounted in a body member and having a through opening which can be positioned relative to two aligned passages in the body member to control the fluid flow through the body member.
Inserts are often provided between the valve member and the corresponding surfaces in the body member to provide an intimate sealing contact with the valve member. These inserts vary in shape and some are provided with tapered outer surfaces while others extend parallel to the corresponding inner surface of the body member. A disadvantage of the tapered inserts is that their sealability is less than optimum since the inserts may preferentially conform to the body member causing a small gap between the mating surfaces of the valve member and the inserts. A disadvantage of inserts with outside diameters parallel to the inside diameter of the plug valve body is that they require the valve assemblies to be disassembled in the event of a leak.
REFERENCES:
patent: 2813695 (1957-11-01), Stogner
patent: 2954961 (1960-10-01), Stogner et al.
patent: 3133722 (1964-05-01), McGuire et al.
patent: 3974869 (1976-08-01), Abe et al.
patent: 4113228 (1978-09-01), Frye
patent: 4796858 (1989-01-01), Kabel
patent: 5154396 (1992-10-01), Conley et al.
patent: 5226445 (1993-07-01), Surjaatmadja
patent: 6012702 (2000-01-01), Heimberger
Hall Gregory A.
Neal Kenneth G.
Halliburton Energy Service,s Inc.
Hirsch Paul J.
Kice Warren B.
Wustenberg John W.
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