Valve plug seal assembly

Details Valve plug seal assembly Valve plug seal assembly

2005-01-11

2005-01-11

Pickard, Alison K. (Department: 3676)

Seal for a joint or juncture

Seal between relatively movable parts

Circumferential contact seal for other than piston

C277S534000, C277S584000

Reexamination Certificate

active

06840520

ABSTRACT:
A seal assembly is adapted for use in a valve having a trim cage with an inner surface extending along an axis and a plug sized to fit inside the trim cage inner surface, wherein the plug is adapted to move along the axis. The seal assembly includes a spring-loaded seal ring disposed between the plug and the trim cage inner surface, the seal ring including a center spring member and a jacket formed of a fluoropolymer resin to tightly seal between the plug and the trim cage inner surface. A first wiper ring is disposed between the plug and the trim cage inner surface and positioned axially upstream of the seal ring, and a second wiper ring is disposed between the plug and the trim cage inner surface and positioned axially downstream of the seal ring. Each of the first and second wiper rings has an outside surface sized to engage the trim cage inner surface and is formed of a material sufficiently rigid to scrape foreign material from the bore surface yet sufficiently soft to minimize damage to the bore.

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Copy of Written Opinion of the International Searching Authority for International Patent Application No. PCT/US04/000550, dated Jul. 12, 2004, 5 pages.

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