Embodiments of a seal element for use in a trim assembly that allow valves and, in particular, balance control valves to meet high-temperature and shut-off requirements. These embodiments can engage and disengage a cage element and a plug element of the trim assembly, thereby creating a seal that pr
Embodiments of a seal element for use in a trim assembly that allow valves and, in particular, balance control valves to meet high-temperature and shut-off requirements. These embodiments can engage and disengage a cage element and a plug element of the trim assembly, thereby creating a seal that prevents leaks of working fluid that can compromise operation of the valve. In one embodiment, the seal element comprises an annular ring that circumscribes the outer periphery of the plug element. The annular ring can deflect in response movement of one part of the plug element relative to another part of the plug element. This deflection can cause the seal element to contact the cage element and the plug element in seal regions that are proximate to one another, and to the outer periphery of the plug element.
대표청구항▼
1. A valve, comprising: a cage element with an inner wall;a plug element disposed in the cage element, the plug element having a center axis and an upper part and a lower part, each of the upper part and the lower part having an outer peripheral surface proximate the inner wall of the cage element,
1. A valve, comprising: a cage element with an inner wall;a plug element disposed in the cage element, the plug element having a center axis and an upper part and a lower part, each of the upper part and the lower part having an outer peripheral surface proximate the inner wall of the cage element, the upper part and the lower part forming a seal feature, the seal feature between the upper part and the lower part, the seal feature having a sealing surface forming a peripheral edge with the outer peripheral surface; anda seal element disposed in the seal feature, the seal element having a first seal surface proximate the sealing surface and a second seal surface proximate the inner wall of the cage element,wherein the upper part and the lower part of the plug element are configured to move relative to one another to change a dimension of the seal feature from a first dimension to a second dimension that is smaller than the first dimension,wherein the seal element has a first deflected position and a second deflected position that corresponds with the first dimension and the second dimension, respectively, andwherein the first deflected position configures the seal element, under load, spaced apart from the cage element and the second deflected position configures the seal element, under load, in contact with the cage element and so that the first seal surface contacts the sealing surface of the seal feature in a seal region that is proximate the outer peripheral edge. 2. The valve of claim 1, wherein the second seal surface contacts the inner wall in the deflected position. 3. The valve of claim 1, wherein the seal element comprises an annular ring that circumscribes the center axis. 4. The valve of claim 1, wherein the seal element comprises a spring washer having a convex side and a concave side that forms the first seal surface thereon. 5. The valve of claim 4, wherein the spring washer comprises metal. 6. The valve of claim 1, wherein the seal element has an outer radial end proximate the outer peripheral surface that forms a tip end, wherein the seal element comprises a first material and a second material that is different from the first material, and wherein the tip end comprises the second material. 7. The valve of claim 6, wherein the second material comprises graphoil. 8. The valve of claim 1, wherein the sealing surface forms an angle with the outer peripheral surface that is 90° or greater. 9. A valve, comprising: a trim assembly comprising a seat ring element, a cage element having an inner surface forming a piston chamber, and a plug element disposed in the piston chamber, the plug element comprising a first plug element, a second plug element that forms an annular groove with the first plug element, and a seal element forming an annular ring disposed in the annular groove and circumscribing about a center axis of the plug element, the annular ring having a convex side and a concave side, wherein the concave side faces the seat ring element,wherein the first plug element and the second plug element have an outer peripheral surface proximate the wall of the piston chamber,wherein the first plug element and the second plug element are configured to move relative to one another to change a dimension of the annular groove, andwherein the dimension configures the annular ring in a first deflected position and a second deflected position, one each that locates the annular ring, under load, spaced apart from the inner surface of the cage element and in contact with the inner surface of the cage element, respectively. 10. The valve of claim 9, wherein the annular ring has a first seal surface on the concave side that forms a first seal region with the plug element in a deflected position. 11. The valve of claim 10, wherein the annular ring has an outer radial surface that forms a second seal region with the inner surface of the cage element in the deflected position. 12. The valve of claim 11, wherein the first seal region resides proximate the outer peripheral surface of the plug element. 13. The valve of claim 10, wherein the annular groove has a first dimension and a second dimension that is smaller than the first dimension, and wherein the second dimension corresponds to the deflected position of the seal element. 14. The valve of claim 10, wherein the trim assembly comprises a stem element with a first section that extends through the first plug element and the second plug element, wherein the first section has a stop feature and terminating at an end having a fastener disposed thereon, and wherein the first plug element and the second plug element are disposed between the stop feature and the fastener. 15. A plug element for a valve, comprising: a first plug element having a first peripheral surface;a second plug element configured to receive the first plug element so that the first plug element is moveable with respect to the second plug element, the second plug element having a second outer peripheral surface that aligns circumferentially with the first peripheral surface and is spaced apart from the first peripheral surface by an annular groove with the first plug element disposed in the second plug element, the second plug element having a sealing surface disposed at an angle relative to the second outer peripheral surface, the second plug element having a recess interior to the second peripheral surface to allow part of the first plug element to overlap with part of the second plug element; anda seal element disposed in the annular groove between the first plug element and the second plug element to position a surface in contact with the sealing surface, the seal element having an inner radial end proximate the first plug element and an outer radial end proximate the second plug element. 16. The plug element of claim 15, wherein the angle between the sealing surface and the outer peripheral surface is 90° or greater. 17. The plug element of claim 15, wherein the first plug element is spaced apart from the second plug element to form a gap, wherein the gap has a first dimension and a second dimension that is smaller than the first dimension, and wherein the second dimension corresponds to a deflected position for the seal element that positions the first seal surface in a seal region on the sealing surface that is proximate an outer peripheral edge of the second plug element. 18. The valve of claim 1, wherein the sealing region is found in an annular area that circumscribes the plug element proximate the outer peripheral edge and covering 6% or less of a total area of the plug element. 19. The valve of claim 9, wherein the sealing region is found in an annular area that circumscribes the plug element proximate the outer peripheral edge and covering 6% or less of a total area of the plug element. 20. The valve of claim 17, wherein the sealing region is found in an annular area that circumscribes the second plug element proximate the second outer peripheral edge and covers 6% or less of a total area of the second plug element.
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이 특허에 인용된 특허 (18)
Schuchart Thomas L. (Casselberry FL) Berrong David B. (Oviedo FL), Aligning and seal ring retracting apparatus for plug type valve.
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