WO1998019087B1 - Valve spindle seal - Google Patents
Valve spindle sealInfo
- Publication number
- WO1998019087B1 WO1998019087B1 PCT/US1997/019029 US9719029W WO9819087B1 WO 1998019087 B1 WO1998019087 B1 WO 1998019087B1 US 9719029 W US9719029 W US 9719029W WO 9819087 B1 WO9819087 B1 WO 9819087B1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- seal
- housing
- valve body
- valve assembly
- actuating shaft
- Prior art date
Links
- 239000012530 fluid Substances 0.000 claims abstract 33
- 238000007789 sealing Methods 0.000 claims abstract 15
- 230000002401 inhibitory effect Effects 0.000 claims abstract 9
- 238000005382 thermal cycling Methods 0.000 claims abstract 7
- 230000001276 controlling effect Effects 0.000 claims abstract 4
- 239000000463 material Substances 0.000 claims 11
- 230000000875 corresponding Effects 0.000 claims 7
- OKTJSMMVPCPJKN-UHFFFAOYSA-N carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims 2
- 238000007906 compression Methods 0.000 claims 2
- 229910002804 graphite Inorganic materials 0.000 claims 2
- 239000010439 graphite Substances 0.000 claims 2
- 239000012196 polytetrafluoroethylene based material Substances 0.000 claims 2
Abstract
A valve assembly configured to maintain a seal during thermal cycling includes a valve body (12) defining a flow passage, and a fluid control member disposed in the flow passage for controlling the flow of fluid. An actuating shaft (26) is interconnected with the fluid control member for moving the fluid control member. A housing (30) including an internal wall (62) defining a shaft bore is connected to the valve body, and the actuating shaft (26) extends through the shaft bore with the internal wall of the housing radially spaced from the actuating shaft to define a sealing cavity. A seal (62) is located within the sealing cavity for inhibiting fluid flow between the actuating shaft and the housing. The seal includes a plurality of first surfaces (82) and the housing defines a plurality of opposed surfaces (42) such that sealing contact of the seal with the actuating shaft and the housing is maintained during thermal cycling.
Claims
1. A valve assembly configured to maintain a seal during thermal cycling in a range of predetermined temperatures, comprising: a valve body defining an inlet, an outlet, and a flow passage extending therebetween, a housing connected to said valve body, said housing including an internal wall defining a shaft bore, a fluid control member disposed in the flow passage and moveable for controlling the flow of fluid through said valve body, an actuating shaft interconnected with said fluid control member for moving said fluid control member between a first, fluid flow permitting position and a second, fluid flow preventing position, said actuating shaft extending through said shaft bore, said internal wall of said housing being radially spaced from said actuating shaft to define a sealing cavity therebetween, and a seal located within said sealing cavity for inhibiting fluid flow between said actuating shaft and said housing by radial compression of said seal resulting from an applied axial load on said seal, said seal being formed of a, said seal being formed of a material that changes size with temperature, said seal including a plurality of first keyed surfaces located in a region spaced from a point of said applied axial load on said seal, and said housing defining a plurality of opposed corresponding keyed surfaces such that - 15 - sealing contact of said seal with said actuating shaft and said housing is maintained during thermal cycling within the range of predetermined temperatures .
2. The valve assembly of claim 1 wherein said plurality of first surfaces are formed by contact under pressure of said seal with said plurality of opposed corresponding surfaces of said housing.
3. The valve assembly of claim 1 wherein said seal includes a primary seal, a secondary seal, and a biaser for loading the primary and secondary seals, said primary seal being formed of said material that changes size with temperature and said primary seal including said plurality of first surfaces, said secondary seal being formed of a material resistant to temperatures above the range of predetermined temperatures such that sealing contact of said secondary seal with said actuating shaft and said housing is substantially maintained at temperatures above the range of predetermined temperatures .
4. The valve assembly of claim 3 wherein said biaser maintains loading of said secondary seal after destruction of said primary seal . - 16 -
5. The valve assembly of claim 3 wherein said material of said primary seal comprises a polytetrafluoroethylene-based material .
6. The valve assembly of claim 3 wherein said material of said secondary seal comprises a graphite-based material.
7. The valve assembly of claim 1 further comprising a main seal located between said valve body and said fluid control member for inhibiting fluid flow between said valve body and said fluid control member.
8. The valve assembly of claim 1 further comprising a body seal located in a region between said housing and said valve body for inhibiting fluid flow between said housing and said valve body, said body seal including a plurality of first surfaces and said housing defining a plurality of opposed corresponding surfaces such that sealing contact of said body seal with said housing and said valve body is maintained during thermal cycling within the range of predetermined temperatures .
9. The valve assembly of claim 8 wherein said plurality of first surfaces of said body seal are formed by contact under pressure of said body seal with said plurality of opposed corresponding surfaces of said housing. - 17 -
10. The valve assembly of claim 1 further comprising a centering gap between said housing and said valve body.
11. The valve assembly of claim 10 further comprising a gap body seal and a seal retainer for inhibiting fluid flow through said centering gap.
12. The valve assembly of claim 1 wherein said range of predetermined temperatures comprises a 300┬░ temperature range within the boundary temperatures of -40 ┬░F and 450 ┬░F.
13. A valve assembly configured to maintain a seal above a range of predetermined temperatures, comprising: a valve body defining an inlet, an outlet, and a flow passage extending therebetween, a housing connected to said valve body, said housing including an internal wall defining a shaft bore, a fluid control member disposed in the flow passage and moveable for controlling the flow of fluid through said valve body, an actuating shaft interconnected with said fluid control member for moving said fluid control member between a first, fluid flow permitting position and a second, fluid flow preventing position, said actuating shaft extending through said shaft bore, said internal wall of said housing being radially spaced from said actuating shaft to define a sealing cavity therebetween, and - 18 - a seal assembly located within said sealing cavity for inhibiting fluid flow between said actuating shaft and said housing by radial compression of said seal resulting from an applied axial load on said seal, said seal assembly including a primary seal, a secondary seal, and a biaser for loading the primary and secondary seals, said primary seal being formed of a material that changes size with temperature, said primary seal including a plurality of first keyed surfaces located in a region spaced from a point of said applied axial load on said seal, and said housing defining a plurality of opposed corresponding keyed surfaces such that sealing contact of said primary seal with said actuating shaft and said housing is maintained during thermal cycling within the range of predetermined temperatures, said secondary seal being formed of a material resistant to temperatures above the range of predetermined temperatures such that sealing contact of said secondary seal with said actuating shaft and said housing is substantially maintained at temperatures above the range of predetermined temperatures.
14. The valve assembly of claim 13 wherein said biaser maintains loading of said secondary seal after destruction of said primary seal .
15. The valve assembly of claim 13 wherein said material of said primary seal comprises a polytetrafluoroethylene-based material . - 19 -
16. The valve assembly of claim 13 wherein said material of said secondary seal comprises a graphite-based material.
17. The valve assembly of claim 13 wherein said range of predetermined temperatures comprises a 280┬░ temperature range within the boundary temperatures of -40┬░F and 350┬░F.
18. A valve assembly configured to maintain a seal in a range of predetermined temperatures, comprising: a valve body defining an inlet, an outlet, and a flow passage extending therebetween, a housing connected to said valve body, said housing including an internal wall defining a shaft bore, a centering gap located between said housing and said valve body, a fluid control member disposed in the flow passage and moveable for controlling the flow of fluid through said valve body, an actuating shaft interconnected with said fluid control member for moving said fluid control member between a first, fluid flow permitting position and a second, fluid flow preventing position, said actuating shaft extending through said shaft bore, said internal wall of said housing being radially spaced from said actuating shaft to define a sealing cavity therebetween, a seal located within said sealing cavity for inhibiting fluid flow between said actuating shaft and said housing, - 20 - a body seal located in a first region between said housing and said valve body for inhibiting fluid flow between said housing and said valve body, said body seal including a plurality of first surfaces and said housing defining a plurality of opposed corresponding surfaces such that sealing contact of said body seal with said housing and said valve body is maintained during thermal cycling within the range of predetermined temperatures, and a gap body seal and a seal retainer located in a second region between said housing and said valve body for inhibiting fluid flow through said centering gap..
19. The valve assembly of claim 18 wherein said plurality of first surfaces are formed by contact under pressure of said body seal with said plurality of opposed corresponding surfaces of said housing.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US08/738,543 US5860633A (en) | 1996-10-28 | 1996-10-28 | Valve seal |
| US08/738,543 | 1996-10-28 |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| WO1998019087A2 WO1998019087A2 (en) | 1998-05-07 |
| WO1998019087A3 WO1998019087A3 (en) | 1998-07-16 |
| WO1998019087B1 true WO1998019087B1 (en) | 1998-08-13 |
Family
ID=24968456
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/US1997/019029 WO1998019087A2 (en) | 1996-10-28 | 1997-10-20 | Valve spindle seal |
Country Status (2)
| Country | Link |
|---|---|
| US (1) | US5860633A (en) |
| WO (1) | WO1998019087A2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050151107A1 (en) * | 2003-12-29 | 2005-07-14 | Jianchao Shu | Fluid control system and stem joint |
Family Cites Families (21)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BE535735A (en) * | ||||
| US881687A (en) * | 1906-05-07 | 1908-03-10 | Robert D Work | Valve. |
| US841960A (en) * | 1906-07-23 | 1907-01-22 | Arthur W Gray | Packing for rotary stems. |
| US2094752A (en) * | 1932-01-06 | 1937-10-05 | Carl W Brand | Packing means for hydraulic jacks |
| US2181748A (en) * | 1936-05-04 | 1939-11-28 | Guiberson Corp | Plunger |
| US2158833A (en) * | 1937-12-16 | 1939-05-16 | Robinson Forster | Stuffing box |
| US3132838A (en) * | 1961-05-25 | 1964-05-12 | Continental Mfg Company | Plug valve having an auxiliary stem seal |
| US4451047A (en) * | 1981-07-31 | 1984-05-29 | Smith International, Inc. | Seal |
| US4475712A (en) * | 1982-01-07 | 1984-10-09 | Xomox Corporation | Fluid valve and method of making same |
| US4462568A (en) * | 1982-03-15 | 1984-07-31 | Xomox Corporation | Valve construction and method of making the same |
| US4660591A (en) * | 1986-06-26 | 1987-04-28 | Whitey Co. | Ball valve and seat assembly |
| US4886241A (en) * | 1987-09-16 | 1989-12-12 | Fisher Controls International, Inc. | Valve stem packing containment for high pressure, high temperature |
| GB2242505A (en) * | 1990-03-30 | 1991-10-02 | Nat Oilwell | Valve sealing system |
| US5056758A (en) * | 1990-05-11 | 1991-10-15 | Bramblet John W | Valve stem packing structure |
| US5338004A (en) * | 1990-07-16 | 1994-08-16 | Heil John S | Valve seal apparatus |
| US5129625A (en) * | 1990-10-09 | 1992-07-14 | Fisher Controls International, Inc. | Live load packing system |
| US5056757A (en) * | 1990-10-12 | 1991-10-15 | Fisher Controls International, Inc. | Packing containment for live loaded fugitive emission seals |
| US5129624A (en) * | 1990-11-15 | 1992-07-14 | M&Fc Holding Company, Inc. | Valve stem sealing means for prevention of fugitive emissions |
| US5178363A (en) * | 1990-11-15 | 1993-01-12 | M&Fc Holding Company, Inc. | Valve stem sealing means for prevention of fugitive emissions |
| DE9212452U1 (en) * | 1992-04-08 | 1992-12-03 | Durco GmbH, 4422 Ahaus | Ball valve |
| US5326074A (en) * | 1992-11-06 | 1994-07-05 | Xomox Corporation | Enhanced sealing arrangement for a rotary valve shaft |
-
1996
- 1996-10-28 US US08/738,543 patent/US5860633A/en not_active Expired - Fee Related
-
1997
- 1997-10-20 WO PCT/US1997/019029 patent/WO1998019087A2/en active Application Filing
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