Valve plug seal assembly
First Claim
1. A valve comprising:
- a body defining a bore extending along an axis;
a plug sized to fit inside the bore and adapted for slidable movement along the bore axis;
a seal ring disposed between the plug and the bore, the seal ring being formed of a flexible material to tightly seal between the plug and the bore;
a first wiper ring disposed between the plug and bore and positioned axially upstream of the seal ring;
a second wiper ring disposed between the plug and the bore and positioned axially downstream of the seal ring;
a first back-up ring positioned between the second wiper ring and the seal ring and, a second back-up positioned axaially downstream of the second wiper ring;
wherein each of the first and second wiper rings have an outside surface sized to engage the bore and are formed of a wiper ring material sufficiently rigid to scrape foreign material from a surface of the bore as the plug moves yet sufficiently resilient to minimize damage to the bore surface.
1 Assignment
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Accused Products
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.
55 Citations
25 Claims
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1. A valve comprising:
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a body defining a bore extending along an axis;
a plug sized to fit inside the bore and adapted for slidable movement along the bore axis;
a seal ring disposed between the plug and the bore, the seal ring being formed of a flexible material to tightly seal between the plug and the bore;
a first wiper ring disposed between the plug and bore and positioned axially upstream of the seal ring;
a second wiper ring disposed between the plug and the bore and positioned axially downstream of the seal ring;
a first back-up ring positioned between the second wiper ring and the seal ring and, a second back-up positioned axaially downstream of the second wiper ring;
wherein each of the first and second wiper rings have an outside surface sized to engage the bore and are formed of a wiper ring material sufficiently rigid to scrape foreign material from a surface of the bore as the plug moves yet sufficiently resilient to minimize damage to the bore surface. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A seal assembly 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, the plug adapted to move along the axis, the seal assembly comprising:
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a seal ring disposed between the plug and the trim cage inner surface, the seal ring being formed of a flexible material adapted to tightly seal between the plug and the trim cage inner surface;
a first wiper ring disposed between the plug and the trim cage inner surface positioned axially upstream of the seal ring;
a second wiper ring disposed between the plug and the trim cage inner surface positioned axially downstream of the seal ring;
a first back-up ring positioned between the second wiper ring and the seal ring; and
, a second back-up ring positioned axially downstream of the second wiper ring;
wherein 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 wiper ring material sufficiently rigid to remove foreign material from the trim cage inner surface as the plug moves yet sufficiently resilient to minimize damage to the bore surface. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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19. A valve comprising:
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a body defining a bore extending along an axis;
a plug sized to fit inside the bore and adapted for slidable movement along the bore axis, the plug including a shoulder;
a seal ring disposed between the plug and the bore, the seal ring being formed of a flexible material to tightly seal between the plug and the bore;
a first wiper ring disposed between the plug and bore and positioned axially upstream of the seal ring;
a second wiper ring disposed between the plug and the bore and positioned axially downstream of the seal ring; and
a back-up ring positioned between the second wiper ring and the seal ring, the back-up ring including an inner flange sized to engage the plug shoulder, the inner flange limiting movement of the back-up ring toward the seal thereby to minimize a compressive load on the seal as the plug moves axially upstream;
wherein each of the first and second wiper rings have an outside surface sized to engage the bore and are formed of a wiper ring material sufficiently rigid to scrape foreign material from a surface of the bore as the plug moves yet sufficiently resilient to minimize damage to the bore surface. - View Dependent Claims (20, 21, 22, 23, 24, 25)
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Specification