WO2005106302A1 - Low pressure stem gas seal - Google Patents
Low pressure stem gas seal Download PDFInfo
- Publication number
- WO2005106302A1 WO2005106302A1 PCT/US2005/011894 US2005011894W WO2005106302A1 WO 2005106302 A1 WO2005106302 A1 WO 2005106302A1 US 2005011894 W US2005011894 W US 2005011894W WO 2005106302 A1 WO2005106302 A1 WO 2005106302A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- stem
- assembly
- seal
- bonnet
- groove
- Prior art date
Links
- 238000007789 sealing Methods 0.000 claims description 20
- 230000013011 mating Effects 0.000 claims description 9
- 238000007373 indentation Methods 0.000 claims 1
- 239000002184 metal Substances 0.000 abstract description 10
- 239000012530 fluid Substances 0.000 abstract description 5
- 238000012423 maintenance Methods 0.000 abstract description 3
- 238000012360 testing method Methods 0.000 abstract description 2
- 238000013461 design Methods 0.000 description 9
- 239000000463 material Substances 0.000 description 3
- 230000000712 assembly Effects 0.000 description 2
- 238000000429 assembly Methods 0.000 description 2
- 238000012856 packing Methods 0.000 description 2
- 239000004696 Poly ether ether ketone Substances 0.000 description 1
- 229920006362 Teflon® Polymers 0.000 description 1
- JUPQTSLXMOCDHR-UHFFFAOYSA-N benzene-1,4-diol;bis(4-fluorophenyl)methanone Chemical compound OC1=CC=C(O)C=C1.C1=CC(F)=CC=C1C(=O)C1=CC=C(F)C=C1 JUPQTSLXMOCDHR-UHFFFAOYSA-N 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 239000000806 elastomer Substances 0.000 description 1
- 210000004907 gland Anatomy 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 229920002530 polyetherether ketone Polymers 0.000 description 1
- 238000012552 review Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K41/00—Spindle sealings
- F16K41/14—Spindle sealings with conical flange on the spindle which co-operates with a conical surface in the housing
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K3/00—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing
- F16K3/02—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing with flat sealing faces; Packings therefor
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K43/00—Auxiliary closure means in valves, which in case of repair, e.g. rewashering, of the valve, can take over the function of the normal closure means; Devices for temporary replacement of parts of valves for the same purpose
- F16K43/008—Auxiliary closure means in valves, which in case of repair, e.g. rewashering, of the valve, can take over the function of the normal closure means; Devices for temporary replacement of parts of valves for the same purpose the main valve having a back-seat position, e.g. to service the spindle sealing
Definitions
- the field of this invention relates to valve stem seals and more particularly to back up stem seals for gate valves designed to contain fluid pressures in the valve body.
- BACKGROUND OF THE INVENTION Gate valves are in common use in the oil and gas industries.
- the American Petroleum Institute (API) has standards that apply to gate valves, notably Standard 6A.
- a gate valve features a gate that is operable in a body to go up against a seat to close the valve.
- a stem is attached to the gate to move the gate up and down.
- the stem can be manually operated, such as with a hand wheel or the valve can be automatically operated by an actuator controlled by a control system sensing a variable in the system where the gate valve is mounted.
- Gate valves are frequently used for open or closed service and are not the preferred design for throttling applications like a choke, where other valve styles dominate.
- the stem that is connected to the gate at one end extends through a bonnet at the other end.
- the bonnet is typically bolted to the valve housing to close off the internal cavity where the gate goes up and down between a valve inlet and a valve outlet.
- a seal assembly is mounted around the stem in a gland created by a counter-bore in the bonnet in the vicinity of where the stem extends through it.
- This seal assembly is the primary stem seal found in all bonnet/actuator assemblies used with gate valves.
- secondary seals have been employed in gate valves.
- the packing around the stem is provided as two interacting assemblies that move relatively with respect to one another, so that if one fails, the other will serve as backup.
- U.S. Patent 4,489,916 Another example of backup stacks of packing rings is U.S. Patent 4,379,557.
- the backup seal is a series of Belleville washers that don't spring into a sealing relation with the bonnet or the stem unless a surrounding heat source, such as a fire, releases the washers into a backup sealing position.
- a surrounding heat source such as a fire
- U.S. Patent 4,082,105 An example of such a design is U.S. Patent 4,082,105.
- Still other designs rely on metal to metal sealing between a portion of the stem assembly and the bonnet as a backup seal if the main stem seal is damaged in a fire.
- U.S. Patent 4,568,062 shows one such design using a backseat flange 56 having a metallic seating surface 56a that contacts a radial surface 62 in the bonnet after a failure caused by fire drives the stem an incremental amount to achieve the stated sealing contact.
- the backseat flange 56 can have o-rings 64 and 66 that also engage surfaces 62 and 60 when fusible ring 52 melts to allow the stem 30 to be pushed up by spring 68.
- U.S. Patent 6,450,477 shows a metal-to-metal contact of a tapered surface 112 on the stem with the bonnet in the event of a fire to act as a secondary seal and to act as a travel stop in normal operation.
- the problem with even the most recent designs is the difficulty in obtaining a low-pressure backup seal to the main stem seal during normal operations when the valve is in its closed position. This is a requirement by some end users.
- the backup seal is frequently expected to hold back at least 200 pounds per square inch of gas pressure in the valve body.
- a backup stem seal for a gate valve retains pressure in the body when the valve is in the closed position.
- the backup seal is secondary to the main stem seal assembly in the bonnet. It features metal-to-metal contact between surfaces that are radially oriented or sloping and further can contain a retaining groove for a seal ring in one or both the opposed metal-to-metal surfaces. The groove can be formed to better retain the ring from damage from flowing fluids when the valve is open. A passage through the bonnet may be used to test for leakage past such seal.
- the backup seal allows maintenance of the main stem seal without removing the valve from service.
- the Figure illustrates the stem in the valve closed position indicating that the backup seal assembly is engaged and showing an enlarged view of the backup seal area.
- DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT Referring to the Figure, the stem 10 is shown extending through the bonnet 12. The stem 10 has a lower end 14, where the gate (not shown) is attached. The bonnet 12 is secured to the valve body (not shown) through bolts (not shown) extending through boltholes 16. A groove 18 holds a seal (not shown) to allow the bonnet 12 to be sealed to the valve body. A main stem seal 20 is held in a known manner between the stem 10 and the bonnet 12.
- bonnet 12 has a tapered surface 22 that comes into contact with a mating surface 24 which may or may not be parallel. While the orientation of surfaces 22 and 24 is shown as oblique to the axis 27 of the stem 10, those skilled in the art will appreciate that a perpendicular orientation is also envisioned by the present invention.
- a generally U-shaped groove 26 is shown in surface 22. Although one groove 26 is shown those skilled in the art will appreciate that more than one groove can be used and that a groove or grooves 26 can appear on surface 22 and/or surface 24 on stem projection 28.
- An internal protrusion 30 that can take a variety of shapes and locations with the shown groove 26 is advantageous in retaining the seal ring 32 in groove 26.
- the groove 26 can have different cross-sectional shapes such as trapezoidal, as one example, so that it can better hold the ring 32 in the groove 26 akin to a dovetail type of connection. It is preferred that some portion of the ring 32 extend beyond surface 22, for example, so that when the stem is brought to the valve closed position there is circumferential contact with the opposing surface 24 with internal pressure built up in the ring 32.
- the preferred material for the ring for many circumstances is a combination of Teflon® with PEEK.
- the present invention allows the gate valve to retain gas pressures within the body with the valve closed between contacting surfaces 22 and 24.
- the use of the ring 32 compensates for minor surface misalignments to ensure a seal.
- the shape of the retaining groove helps to hold on to the ring 32 when the valve is in the open position and flow moves quickly past the mounting location for the ring 32.
- the mating surfaces can have a radial or oblique orientation with respect to axis 27.
- One or more rings 32 can be used mounted in a respective groove 26, in either or both surfaces 22 and/or 24.
- An access passage 34 extends through bonnet 12 to allow checking if there is a secondary seal intact. Maintenance on the primary seal 20 can be attempted with there being a seal between surfaces 22 and 24 and low gas pressure in the order of about 200 pounds per square inch in the valve body. However, it is preferred to bleed all pressure off the valve body before attempting a repair of seal 20. Additionally, ring 32 can be in one piece or multiple pieces such as a capped o-ring and can be made from one material or combinations that extend uniformly or non-uniformly. It is to be understood that this disclosure is merely illustrative of the presently preferred embodiments of the invention and that no limitations are intended other than as described in the appended claims.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Details Of Valves (AREA)
- Lift Valve (AREA)
- Sliding Valves (AREA)
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CA002540282A CA2540282A1 (en) | 2004-04-14 | 2005-04-07 | Low pressure stem gas seal |
AU2005238872A AU2005238872A1 (en) | 2004-04-14 | 2005-04-07 | Low pressure stem gas seal |
GB0610214A GB2423133A (en) | 2004-04-14 | 2005-04-07 | Low pressure stem gas seal |
NO20061084A NO20061084L (en) | 2004-04-14 | 2006-03-06 | Gas seal for low pressure steam |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US56215204P | 2004-04-14 | 2004-04-14 | |
US60/562,152 | 2004-04-14 |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2005106302A1 true WO2005106302A1 (en) | 2005-11-10 |
WO2005106302A8 WO2005106302A8 (en) | 2006-05-11 |
Family
ID=34966202
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US2005/011894 WO2005106302A1 (en) | 2004-04-14 | 2005-04-07 | Low pressure stem gas seal |
Country Status (8)
Country | Link |
---|---|
US (1) | US20050230653A1 (en) |
CN (1) | CN1860320A (en) |
AU (1) | AU2005238872A1 (en) |
CA (1) | CA2540282A1 (en) |
GB (1) | GB2423133A (en) |
NO (1) | NO20061084L (en) |
RU (1) | RU2006116451A (en) |
WO (1) | WO2005106302A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2407453A1 (en) | 2005-09-27 | 2012-01-18 | Shionogi & Co., Ltd. | PGD2 receptor antagonist |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20100276624A1 (en) * | 2009-05-01 | 2010-11-04 | Swagelok Company | Seal with seal support shoulder |
CN103917811A (en) | 2011-09-30 | 2014-07-09 | 集成设备有限公司 | Expanding gate valve assembly |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3412750A (en) * | 1966-10-25 | 1968-11-26 | Alexander S. Volpin | Back sealing arrangement for gate valve stems |
US4230299A (en) * | 1978-07-03 | 1980-10-28 | Petroleum Designers, Inc. | Pressure balanced gate valve having selective actuator systems |
US4379557A (en) | 1981-03-05 | 1983-04-12 | Acf Industries, Incorporated | Valve stem packing structure |
US4489916A (en) | 1982-04-07 | 1984-12-25 | Cameron Iron Works, Inc. | Valve and stem seal therefor |
US4568062A (en) | 1983-03-07 | 1986-02-04 | Fmc Corporation | Fire-resistant gate valve |
US5127629A (en) * | 1991-05-24 | 1992-07-07 | Fmc Corporation | Valve stem flex lip backseat |
US6450477B1 (en) | 1994-03-04 | 2002-09-17 | Terry G. Young | Valve actuator apparatus |
Family Cites Families (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US156877A (en) * | 1874-11-17 | Improvement in oil-can tops | ||
US1009763A (en) * | 1910-09-10 | 1911-11-28 | Marsh Valve Company | Valve. |
US2049516A (en) * | 1933-11-03 | 1936-08-04 | John W Ruhstorfer | Packless valve bonnet |
US2924232A (en) * | 1954-04-09 | 1960-02-09 | Eugene C Michaels | Valve with repair means |
US3379405A (en) * | 1966-01-03 | 1968-04-23 | Acf Ind Inc | Valve |
US4082105A (en) * | 1976-12-17 | 1978-04-04 | Carmeron Iron Works, Inc. | Valve stem packing assembly with temperature responsive seal |
US4354425A (en) * | 1980-05-09 | 1982-10-19 | U.S. Industries, Inc. | Fire-safe valve actuator |
US4440381A (en) * | 1981-09-08 | 1984-04-03 | Tipton Jr Robert G | Gate valve |
US4991619A (en) * | 1989-01-04 | 1991-02-12 | Saes Getters Spa | High purity gas delivery control assembly |
US5238252A (en) * | 1990-01-18 | 1993-08-24 | Eisenwerk Heinrich Schilling Gmbh & Co. | Shut-off fittings with a sealing device |
US5730419A (en) * | 1994-07-12 | 1998-03-24 | Fmc Corporation | Dual backseat valve assembly |
US5435520A (en) * | 1994-09-07 | 1995-07-25 | Cooper Industries, Inc. | Backseat assembly for an expanding gate valve |
US5743288A (en) * | 1997-03-12 | 1998-04-28 | Erc Industries, Inc. | Valve having provision for replacing stem packing while the valve is under pressure |
US6401747B1 (en) * | 2000-07-13 | 2002-06-11 | Fmc Corporation | Gate valve |
-
2005
- 2005-04-07 GB GB0610214A patent/GB2423133A/en not_active Withdrawn
- 2005-04-07 CA CA002540282A patent/CA2540282A1/en not_active Abandoned
- 2005-04-07 AU AU2005238872A patent/AU2005238872A1/en not_active Abandoned
- 2005-04-07 RU RU2006116451/06A patent/RU2006116451A/en not_active Application Discontinuation
- 2005-04-07 CN CNA2005800009077A patent/CN1860320A/en active Pending
- 2005-04-07 WO PCT/US2005/011894 patent/WO2005106302A1/en active Application Filing
- 2005-04-14 US US11/106,298 patent/US20050230653A1/en not_active Abandoned
-
2006
- 2006-03-06 NO NO20061084A patent/NO20061084L/en not_active Application Discontinuation
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3412750A (en) * | 1966-10-25 | 1968-11-26 | Alexander S. Volpin | Back sealing arrangement for gate valve stems |
US4230299A (en) * | 1978-07-03 | 1980-10-28 | Petroleum Designers, Inc. | Pressure balanced gate valve having selective actuator systems |
US4379557A (en) | 1981-03-05 | 1983-04-12 | Acf Industries, Incorporated | Valve stem packing structure |
US4489916A (en) | 1982-04-07 | 1984-12-25 | Cameron Iron Works, Inc. | Valve and stem seal therefor |
US4568062A (en) | 1983-03-07 | 1986-02-04 | Fmc Corporation | Fire-resistant gate valve |
US5127629A (en) * | 1991-05-24 | 1992-07-07 | Fmc Corporation | Valve stem flex lip backseat |
US6450477B1 (en) | 1994-03-04 | 2002-09-17 | Terry G. Young | Valve actuator apparatus |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2407453A1 (en) | 2005-09-27 | 2012-01-18 | Shionogi & Co., Ltd. | PGD2 receptor antagonist |
Also Published As
Publication number | Publication date |
---|---|
AU2005238872A1 (en) | 2005-11-10 |
NO20061084L (en) | 2006-04-05 |
US20050230653A1 (en) | 2005-10-20 |
WO2005106302A8 (en) | 2006-05-11 |
GB2423133A (en) | 2006-08-16 |
RU2006116451A (en) | 2008-05-20 |
CN1860320A (en) | 2006-11-08 |
CA2540282A1 (en) | 2005-11-10 |
GB0610214D0 (en) | 2006-07-05 |
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