A metal valve stem seal and sealing system includes a valve body, a metal valve stem housed within the valve body, a bonnet member housed within the valve body, and a U-shaped metal stem gasket positioned between the metal valve stem and the bonnet member. The gasket has a first lip member and a sec
A metal valve stem seal and sealing system includes a valve body, a metal valve stem housed within the valve body, a bonnet member housed within the valve body, and a U-shaped metal stem gasket positioned between the metal valve stem and the bonnet member. The gasket has a first lip member and a second lip member. The metal valve stem seal and sealing system also includes a metal wedge ring fitted between the first and second lip members and at least one metal energizing spring adjacent the wedge ring. The spring applies a sufficient force to the wedge ring to cause the wedge ring to apply a sufficient contact pressure to the first and second lip members to form a seal between the gasket and the metal valve stem and to form a seal between the gasket and the bonnet member.
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What is claimed is: 1. A metal valve stem sealing system comprising: (a) a valve body; a metal valve stem housed within the valve body; (b) a bonnet member housed within the valve body; (c) a U-shaped metal stem gasket positioned between the metal valve stem and the bonnet member, wherein the gaske
What is claimed is: 1. A metal valve stem sealing system comprising: (a) a valve body; a metal valve stem housed within the valve body; (b) a bonnet member housed within the valve body; (c) a U-shaped metal stem gasket positioned between the metal valve stem and the bonnet member, wherein the gasket has a first lip member and a second lip member each having an interior surface and an exterior surface, wherein the first and second lip members have upper portions and lower portions, and wherein the lower portion of each lip member has an exterior sloped surface; (d) a metal wedge ring fitted between the interior surface of the first lip member and the interior surface of the second lip member; and (e) at least one metal energizing spring adjacent the wedge ring, wherein the metal energizing spring applies a sufficient force to the wedge ring to cause the wedge ring to apply a sufficient contact pressure to the first and second lip members such that the exterior sloped surfaces of the first and second lip members rotate outwardly to extend, respectively, a first airtight seal contact area between the first lip member and the metal valve stem and a second airtight seal contact area between the second lip member and the bonnet member. 2. The metal valve stem sealing system of claim 1 further comprising an anti-rotation pin attached to the metal stem gasket. 3. The sealing system of claim 1 wherein the first lip member is coated on an exterior surface with an alloy selected from the group of alloys comprising tungsten carbides and chromium carbides. 4. The sealing system of claim 1 wherein the valve stem is coated on an exterior surface with an alloy selected from the group of alloys comprising tungsten carbides and chromium carbides. 5. The sealing system of claim 1 wherein the contact pressure is proportional to an operating pressure applied to the interior of the gasket. 6. The sealing system of claim 1 wherein the wedge ring comprises a metal selected from the group consisting of stainless steel and a nickel-based alloy. 7. The sealing system of claim 1 wherein the energizing spring comprises a metal selected from the group consisting of stainless steel and a nickel-based alloy. 8. The sealing system of claim 1 wherein said at least one metal energizing spring comprises a plurality of energizing springs. 9. The sealing system of claim 1 wherein the sealing system is used in deep sea gas and oil drilling, subsea flow lines and pipelines. 10. The sealing system of claim 1 wherein the force applied by the energizing spring to the wedge ring is in the range of from about 100 pounds to about 2000 pounds. 11. The sealing system of claim 1 wherein the gasket and lip members can withstand an operating pressure of up to 20,000 psi. 12. The sealing system of claim 1 wherein the valve stem is a rotating stem. 13. The sealing system of claim 1 wherein the valve stem is a rising stem. 14. The sealing system of claim 1 further comprising a stem bearing adjacent a first top portion of the gasket; an energizing spring and spring holder both adjacent a second top portion of the gasket; and a thrust bearing adjacent a lower end of the energizing spring. 15. A metal valve stem sealing system comprising: (a) a valve body; a movable metal valve stem extending through a stem opening within the valve body; (b) a bonnet member housed within the valve body; (c) a U-shaped metal stem gasket positioned between an exterior surface of the metal valve stem and an exterior surface of the bonnet member, wherein the gasket has a first lip member and a second lip member that both extend downwardly from a gasket body, the first and second lip members each having an interior surface and an exterior surface, wherein the first and second lip members have upper portions and lower portions, and wherein the lower portion of each lip member has an exterior sloped surface; (d) a metal wedge ring fitted into position between the interior surface of the first lip member and the interior surface of the second lip member; and (e) at least one metal energizing spring positioned adjacent a bottom portion of the wedge ring, wherein the metal energizing spring applies a sufficient force to the wedge ring to cause the wedge ring to apply a sufficient contact pressure to the first and second lip members such that the exterior sloped surfaces of the first and second lip members rotate outwardly to extend, respectively, a first airtight seal contact area between the first lip member and the metal valve stem and a second airtight seal contact area between the second lip member and the bonnet member. 16. The sealing system of claim 15 further comprising an anti-rotation pin attached to the metal stem gasket. 17. A metal-to-metal seal for sealing between a movable metal valve stem and a bonnet member, the metal seal comprising: (a) a U-shaped metal stem gasket positioned between an exterior surface of the metal valve stem and an exterior surface of the bonnet member, wherein the gasket has a first flexible lip member and a second flexible lip member, the first and second lip members each having an interior surface, an exterior surface, an upper portion, and a lower portion, and further wherein the lower portion of each lip member has an exterior sloped surface; (b) a metal wedge ring positioned between the interior surface of the first lip member and the interior surface of the second lip member; and (c) at least one metal energizing spring positioned adjacent the wedge ring, wherein the metal energizing spring applies a sufficient force to the wedge ring which causes the wedge ring to apply a sufficient contact pressure to the first and second lip members such that the exterior sloped surfaces of the first and second lip members rotate outwardly to extend, respectively, a first airtight seal contact area between the first lip member and the exterior surface of the metal valve stem and a second airtight seal contact area between the second lip member and the exterior surface of the bonnet member. 18. The metal-to-metal seal of claim 17 wherein the gasket and lip members can withstand an operating pressure of up to 20,000 psi. 19. The metal-to-metal seal of claim 17 further comprising an anti-rotation pin attached to the metal stem.
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이 특허에 인용된 특허 (29)
Turner Edwin C, Annular sealing assembly and methods of sealing.
Morrill Charles D. (Bellaire TX), Extreme temperature, high pressure balanced, rising stem gate valve with super preloaded, stacked, solid lubricated, met.
Balzano Lucien D. (Jouars-Pontchartrain FRX) Lepretre Marc V. A. (Bois-Colombes FRX) Portier Claude (Le Chesnay FRX), High-pressure sealing device between two elements in relative motion.
Jennings Charles E. (Houston TX) Barrington Claud C. (Houston TX) Chen Lien-Yan (Spring TX) Hopkins Bob C. (Houston TX) McIntyre John N. (Spring TX) Regitz Alfred P. (Houston TX), Valve stem-to-bonnet backseat.
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