Valve with self-cleaning trim
First Claim
1. A valve comprising:
- a cage defining a bore extending along an axis, a plug sized to fit inside the bore and adapted for slidable movement along the bore axis between closed and throttle positions, the plug comprising a proximal end connected to a stem and a distal end, the plug further comprising a seat disposed between the proximal and distal ends thereof, a seal ring disposed between the distal end of the plug and the cage when the plug is in the closed position, the seal ring comprising a seating surface for engaging the seat of the plug when the plug is in the closed position the plug further comprising a wiper seal disposed between the seat and distal end thereof, the wiper seal comprising an outside surface adapted to engage the bore and the seating surface of the sealing ring as the plug is moved between the closed and throttle positions.
2 Assignments
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Accused Products
Abstract
The seal assembly is disclosed for use with a valve having a trim cage with an inner surface extending along in axis and a plug sized to fit inside the trim cage inner surface, wherein the plug is adapted to move along the axis thereof. A seal ring is attached to an upstream portion of the cage to effectuate a seal with the plug. The plug is equipped with a wiper seal that cleans or otherwise removes debris from the seating surface of the seal ring, an interior surface of the seal ring and an interior surface of the cage during both the opening and the closing of the valve. Thus, the valve is self-cleaning. Further, the wiper seal delays throttling action through the valve until the plug has moved a substantial distance away from the seating surface of the seal ring which reduces high pressure abrasive flow against the seating surface of the seal ring to reduce wear on the trim set.
62 Citations
22 Claims
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1. A valve comprising:
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a cage defining a bore extending along an axis, a plug sized to fit inside the bore and adapted for slidable movement along the bore axis between closed and throttle positions, the plug comprising a proximal end connected to a stem and a distal end, the plug further comprising a seat disposed between the proximal and distal ends thereof, a seal ring disposed between the distal end of the plug and the cage when the plug is in the closed position, the seal ring comprising a seating surface for engaging the seat of the plug when the plug is in the closed position the plug further comprising a wiper seal disposed between the seat and distal end thereof, the wiper seal comprising an outside surface adapted to engage the bore and the seating surface of the sealing ring as the plug is moved between the closed and throttle positions. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
the upper wiper seal being fabricated from PEEK or a metal, the lower wiper seal being fabricated from PEEK or a metal. -
8. The valve of claim 1 wherein the plug further comprises a soft-seat-type seal disposed between the wiper seal and the seat.
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9. The valve of claim 8 wherein the soft-seat-type seal is fabricated from a material selected from the group consisting of UHMWPE, polytetrafluorethylene and CTFE.
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10. The valve of claim 8 wherein the soft-seat-type seal and the wiper seal are accommodated in a groove disposed in the plug.
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11. The valve of claim 8 wherein the wiper seal is accommodated in a first groove disposed in the plug and the soft-seat-type seal is accommodated in a second groove disposed in the plug, the second groove being disposed between the first groove and the seat.
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12. The valve of claim 1 wherein the wiper seal is an expanding seal that is biased radially outwardly.
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13. A valve comprising:
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a cage defining a bore extending along an axis, a plug sized to fit inside the bore and adapted for slidable movement along the bore axis between closed and throttle positions, the plug including a seat, the plug further comprising a proximal end connected to a stem and a distal end with a seat disposed therebetween, the plug further comprising a circumferential slot disposed between the seat and the distal end, the circumferential slot accommodating a radially expanding wiper seal, a seal ring disposed between the plug and the cage when the plug is in the closed position, the seal ring comprising a seating surface for engaging the seat of the plug when the plug is in the closed position, the radially expanding wiper seal comprising an outside surface adapted to engage the cage and the seating surface as the plug is moved between the closed and throttle positions, the radially expanding wiper seal comprising a material sufficiently rigid to scrape foreign material from a surface of the cage and from the seating surface as the plug moves between the closed and throttle positions yet sufficiently resilient to minimize damage to the seating surface. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22)
the upper wiper seal being fabricated from PEEK, the lower wiper seal being fabricated from a metal. -
19. The valve of claim 13 wherein the plug further comprises a soft-seat-type seal disposed between the wiper seal and the seat.
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20. The valve of claim 18 wherein the soft-seat-type seal and the wiper seal are both accommodated in a groove disposed in the plug.
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21. The valve of claim 18 wherein the wiper seal is accommodated in a first groove disposed in the plug and the soft-seat-type seal is accommodated in a second groove disposed in the plug, the second groove being disposed between the first groove and the seat.
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22. The valve of claim 18 wherein the soft-seat-type seal comprises a material selected from the group consisting of UHMWPE, polytetrafluorethylene and CTFE.
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Specification