초록 ▼

A seal assembly for use with valves is described. An example seal assembly includes a first seal and a second seal opposite the first seal. The first and second seals are to sealingly engage a closure member of a valve and a sealing surface opposite the closure member. A spacer ring is disposed betw

A seal assembly for use with valves is described. An example seal assembly includes a first seal and a second seal opposite the first seal. The first and second seals are to sealingly engage a closure member of a valve and a sealing surface opposite the closure member. A spacer ring is disposed between the first and second seals to prevent the first and second seals from contacting each other. Additionally, the spacer ring is sized so that the spacer ring does not contact the closure member or the sealing surface.

대표청구항 ▼

1. A seal assembly for use with fluid valves comprising: a first seal having a first cavity and first end portions that project toward an opening of the first cavity, the first end portions configured to retain a first spring in the first cavity;a second seal having a second cavity and second end po

1. A seal assembly for use with fluid valves comprising: a first seal having a first cavity and first end portions that project toward an opening of the first cavity, the first end portions configured to retain a first spring in the first cavity;a second seal having a second cavity and second end portions that project toward an opening of the second cavity, the second end portions configured to retain a second spring in the second cavity, the second seal to be positioned opposite the first seal, the first and second seals to sealingly engage a closure member of a valve and a sealing surface opposite the closure member;a spacer ring at least partially disposed within the cavities of the first and second seals to prevent the first and second seals from contacting each other, the spacer ring fixed in position relative to the first and second seals along a longitudinal axis of the closure member, wherein a maximum thickness of the spacer ring is less than respective widths of the first and second cavities;a back-up ring adjacent the first spring-loaded seal or the second spring-loaded seal; anda piston ring adjacent the back-up ring, the back-up ring and the piston ring to maintain the position of the first and second seals relative to the valve plug. 2. A seal as defined in claim 1, wherein the cavities of the first and second seals face each other. 3. A seal as defined in claim 1, wherein the sealing surface comprises an inner surface of a cage. 4. A seal as defined in claim 1, wherein the first seal or the second seal includes a spring disposed within a jacket to urge the jacket against the sealing surface and the closure member. 5. A seal as defined in claim 1, wherein the spacer ring comprises a metal or thermoplastic material. 6. A seal defined in claim 1, wherein the closure member comprises a plug. 7. A seal as defined in claim 1, wherein the spacer ring includes an aperture therethrough to enable the flow of pressurized fluid between a first side and a second side of the spacer ring. 8. A seal as defined in claim 1, wherein the spacer ring is sized to fit within respective outer surfaces of the first and second seals. 9. A seal as defined in claim 1, wherein the spacer ring is spaced away from the first and second end portions. 10. A seal configured for use with a valve, comprising: a seal assembly to be disposed adjacent an inner surface of a cage and an outer surface of a valve plug to substantially prevent leakage of fluid between the cage and the valve plug when the valve plug is in the closed position, wherein the seal assembly comprises: a first spring-loaded seal and a second spring-loaded seal opposite the first spring-loaded seal; anda spacer ring at least partially disposed within an opening of each of the first and second spring-loaded seals such that the spacer ring is fixed in position relative to the first and second spring-loaded seals along a longitudinal axis of the valve plug, the spacer ring to maintain the first and second spring-loaded seals in spaced apart relation to prevent the first and second spring-loaded seals from contacting each other, wherein the spacer ring is sized to fit within respective outer surfaces of the first and second spring-loaded seals to not contact the cage and the valve plug and to enable fluid to flow into the openings, wherein each of the first and second spring-loaded seals include spring-engaging lips positioned adjacent respective ends of the first and second spring-loaded seals, the spring-engaging lips to project toward the respective openings of the first and second spring-loaded seals, wherein the spacer ring does not engage the spring-engaging lips;a back-up ring adjacent the first spring-loaded seal or the second spring-loaded seal to maintain a position of the seal assembly relative to the valve plug; anda piston ring adjacent a back-up ring to maintain the position of the seal assembly and a position of the back-up ring relative to the valve plug. 11. A seal as defined in claim 10, wherein the first spring-loaded seal or the second spring-loaded seal comprises a spring portion disposed within an outer jacket. 12. A seal as defined in claim 11, wherein the spring has a V-shaped or U-shaped cross-sectional shape. 13. A seal as defined in claim 11, wherein the spring portion comprises stainless steel and the outer jacket comprises a thermoplastic material. 14. A seal as defined in claim 11, wherein the outer jacket defines outer surfaces of the first or second spring-loaded seal. 15. A seal as defined in claim 11, wherein the outer jacket engages the outer surface of the valve plug and the inner surface of the cage to provide a seal between the cage and the valve plug. 16. A seal as defined in claim 10, wherein the spacer ring includes an aperture therethrough to enable the flow of pressurized fluid between a first side and a second side of the spacer ring. 17. A seal as defined in claim 10, wherein the spacer ring is sized to fit within respective outer surfaces of the first and second spring-loaded seals and does not contact a cage and a valve plug. 18. A seal for use with a valve, comprising: first means for sealing and second means for sealing opposite the first means for sealing, the first and second means for sealing to sealingly engage means for controlling fluid flow of a valve and a sealing surface opposite the means for controlling fluid flow, the first and secondmeans for sealing each having means for holding ends of a spring in a cavity of the respective first and second means for sealing, the means for holding to project toward the respective cavities;means for retaining at least partially positioned inside an opening of each of the first and second means for sealing to retain the first means for sealing spaced away from the second means for sealing and prevent the first and second means for sealing from contacting each other, the means for retaining being fixed in position relative to the first and second means for sealing along a longitudinal axis of the means for controlling fluid flow of the valve, the means for retaining having a maximum thickness that is less than respective widths of the openings;first means for maintaining a position of the first and second means for retaining relative to the means for controlling fluid flow, the first means for maintaining being adjacent the first or second means for retaining; andsecond means for maintaining a position of the first means for maintaining relative to the means for controlling fluid flow, the second means for maintaining being adjacent the first means for positioning. 19. A seal as described in claim 18, wherein the means for retaining comprises means for spacing disposed between the first and second means for sealing. 20. A seal as described in claim 19, wherein the means for spacing includes means for allowing fluid flow through the means for spacing. 21. A seal as described in claim 18, wherein the means for retaining does not engage the means for holding.