CN107504244B - Sealing joint used between valve body and valve cover - Google Patents
Sealing joint used between valve body and valve cover Download PDFInfo
- Publication number
- CN107504244B CN107504244B CN201710893302.XA CN201710893302A CN107504244B CN 107504244 B CN107504244 B CN 107504244B CN 201710893302 A CN201710893302 A CN 201710893302A CN 107504244 B CN107504244 B CN 107504244B
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- China
- Prior art keywords
- sealing
- conical surface
- valve body
- joint
- deformation
- Prior art date
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- 238000007789 sealing Methods 0.000 title abstract description 105
- 239000002184 metal Substances 0.000 abstract description 16
- 239000004033 plastic Substances 0.000 abstract description 6
- 230000005489 elastic deformation Effects 0.000 abstract description 5
- 238000005452 bending Methods 0.000 abstract description 4
- 230000035882 stress Effects 0.000 description 9
- 238000009434 installation Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 229910000037 hydrogen sulfide Inorganic materials 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 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
- F16K27/00—Construction of housing; Use of materials therefor
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B34/00—Valve arrangements for boreholes or wells
- E21B34/02—Valve arrangements for boreholes or wells in well heads
-
- 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
- F16K27/00—Construction of housing; Use of materials therefor
- F16K27/08—Guiding yokes for spindles; Means for closing housings; Dust caps, e.g. for tyre valves
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Fluid Mechanics (AREA)
- Environmental & Geological Engineering (AREA)
- Physics & Mathematics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Lift Valve (AREA)
- Gasket Seals (AREA)
Abstract
The invention discloses a sealing joint used between a valve body and a valve cover, which is provided with a first sealing part and a second sealing part, wherein the first sealing part is arranged concentrically with the valve body; the first sealing part consists of a sealing conical surface arranged on the outer wall of the joint and an arc surface arranged on the inner wall of the joint and used for supporting the sealing conical surface, and the sealing conical surface and the arc surface have transverse component forces with equal magnitudes and opposite directions at the respective stress positions; the second sealing part is annular and extends outwards from the middle part of the sealing conical surface. When the sealing conical surface is acted by force, the sealing conical surface generates bending deformation, and meanwhile, the circular arc surface supports the sealing conical surface and converts plastic deformation of the sealing conical surface into elastic deformation. The invention improves the deformation strength of the metal sealing piece on the basis of not influencing the drift diameter, converts plastic deformation into elastic deformation, solves the problem that the deformation strength of the traditional sealing joint is not high, avoids the phenomenon of a teeterboard, has simple structure and convenient debugging, and can be suitable for the working conditions of low temperature below-60 ℃ and high temperature above 345 ℃.
Description
Technical Field
The invention relates to the field of wellhead operation, in particular to a sealing joint used between a valve body and a valve cover.
Background
In oil or gas production trees on land and offshore platforms, valves are a particularly important component. As a sealing part between the valve body and the valve cover in the valve, the sealing is a special sealing joint formed by a self-sealing body and a sealed carrier. For a general wellhead, rubber sealing is mostly adopted between a valve body and a valve cover, however, the rubber sealing has the defects of ageing and losing elasticity due to long-term use and cannot be used for a long time. For important well heads such as low temperature below minus 60 ℃ and high temperature above 345 ℃, carbon dioxide and hydrogen sulfide containing media, high pressure gas and the like, metal sealing is needed between the valve body and the valve cover, and the metal sealing is generally not influenced by using time, temperature and corrosive media.
In the valve field of API6A, for working pressure valves above 5000Psi, a flat metal seal is typically employed between the valve body and the valve cover, and for 10000Psi working pressure valves, a GLOC metal seal is typically employed between the valve body and the valve cover.
However, the current GLOC metal seals suffer from the following drawbacks:
1. the interference is larger in design, so that the installation clearance between the end face of the valve body and the end face of the valve cover is particularly large, the positioning capability of the GLOC metal sealing element on the carrier sealing conical surface is affected, the GLOC metal sealing element can sometimes generate a 'teeterboard' phenomenon under the action of force, and the sealing conical surface of the GLOC metal sealing element can be crushed, so that the installation personnel is required to have high operation skill, otherwise, the installed valve can leak.
2. Because the large interference exists, the metal sealing piece is not regular in deformation, and plastic deformation can occur at a certain position of the metal sealing piece, so that the current metal sealing piece cannot bear high pressure of more than 15000Psi and cannot be reused.
3. In the oilfield field, the valves already installed on the tree cannot be serviced, mainly because the valves are located differently on the tree, with vertical installation, horizontal installation, and inverted installation, which results in poor positioning of the GLOC metal seals being used unless the valves are removed from the tree for servicing.
Disclosure of Invention
In order to overcome the problems, the invention provides a sealing joint used between a valve body and a valve cover, which solves the problems that the existing sealing joint is not high in deformation strength and avoids the phenomenon of a teeterboard.
The technical scheme adopted for solving the technical problems is as follows: a sealing joint for use between a valve body and a valve cover has a first sealing portion arranged concentrically with the valve body and a second sealing portion for mounting on a stepped surface of the valve body. The first sealing part consists of a sealing conical surface arranged on the outer wall of the joint and an arc surface arranged on the inner wall of the joint and used for supporting the sealing conical surface, and the sealing conical surface and the arc surface have transverse component forces with equal magnitudes and opposite directions at the respective stress positions. The second sealing part is annular and extends outwards from the middle part of the sealing conical surface.
By adopting the technical scheme, the original inner hole cylindrical surface is changed into the circular arc surface on the basis of not affecting the drift diameter, when the sealing conical surface receives force, the sealing conical surface generates bending deformation, and at the moment, the circular arc surface plays a role in supporting the sealing conical surface, so that the deformation strength of the metal sealing element can be improved, and plastic deformation is converted into elastic deformation.
In order to improve the positioning capability of the sealing joint, the sealing conical surface of the first sealing part comprises a first conical surface close to the second sealing part and a second conical surface arranged above the first conical surface. And the taper of the first conical surface is smaller than that of the second conical surface.
As an embodiment of the present invention, the taper of the first tapered surface is 16 ° and the taper of the second tapered surface is 19 °. According to the invention, the 19-degree conical surface is added on the sealing conical surface, so that on one hand, the larger interference is reduced to the minimum on the premise of ensuring sealing, the gap between the end surface of the valve body and the end surface of the valve cover can be reduced to the minimum, and on the other hand, the occurrence of the teeterboard phenomenon can be effectively avoided, thereby improving the positioning capability of the sealing joint and avoiding the sealing conical surface from being crushed.
Compared with the prior art, the invention has the advantages that:
on the basis of not affecting the drift diameter, the original inner hole cylindrical surface is changed into the circular arc surface, when the sealing conical surface is acted by force, the sealing conical surface generates bending deformation, and the circular arc surface plays a role in supporting the sealing conical surface, so that the deformation strength of the metal sealing element can be improved, and plastic deformation is converted into elastic deformation. In addition, the hardness of the material used for the sealing joint is much lower than that of the material used for the valve cover and the valve body, so the sealing surface of the valve cover and the valve body is not damaged during use.
The invention can bear 20000Psi working pressure at normal temperature, has the advantages of simple structure, convenient processing and manufacturing, no special tool for disassembly and assembly, and saving of installation and debugging time, can not influence the sealing quality under the condition of pressure fluctuation and temperature change, can be repeatedly used for a plurality of times, and is suitable for the working condition of low temperature below minus 60 ℃ and high temperature above 345 ℃.
The invention will be described in more detail below with reference to the drawings and examples.
Drawings
FIG. 1 is a diagram showing the relationship between the present invention and a valve body or a valve cover.
Fig. 2 is a cross-sectional view of the present invention.
Fig. 3 is a partial enlarged view of fig. 2.
Fig. 4 is a schematic structural view of the present invention, illustrating the contact positions of the sealing joint with the valve body and the valve cover.
Fig. 5 is a stress state diagram of the present invention in operation.
FIG. 6 is a stress state diagram of the second tapered surface and the second sealing portion.
Fig. 7 is a stress distribution diagram of the present invention.
In the figure, 100, a sealing joint, 101, a valve body, 102, a valve cover, 10, a first sealing part, 20, a second sealing part, 1, a sealing conical surface, 2, an arc surface, 3, a first conical surface, 4, a second conical surface, 5, a first stress distribution area, 6 and a second stress distribution area.
Detailed Description
Examples
Referring to fig. 1 to 7, a sealing joint 100 for use between a valve body 101 and a valve cover 102 has a first sealing portion 10 arranged concentrically with the valve body, and a second sealing portion 20 for mounting on a stepped surface of the valve body. The first sealing portion 10 is substantially elliptical in cross-section and the second sealing portion 20 is substantially rectangular in cross-section of the sealing joint 100.
The first sealing part 10 is composed of a sealing conical surface 1 arranged on the outer wall of the joint and an arc surface 2 arranged on the inner wall of the joint and used for supporting the sealing conical surface 1.
The second sealing portion 20 is annular and extends outwardly from the middle of the sealing cone 1.
When the sealing conical surface 1 receives the force, the sealing conical surface 1 generates bending deformation, and the circular arc surface 2 plays a role in supporting the sealing conical surface 1, so that the deformation strength of the metal sealing element can be improved, and the plastic deformation is converted into elastic deformation. As shown in fig. 6, the second conical surface 4 of the sealing conical surface and the circular arc surface 2 have equal and opposite transverse component forces at the respective stress positions, specifically, the acting force on the second conical surface 4 is F1, the circular arc surface 2 generates a supporting force F2, and the component forces of F1 and F2 on the x axis are equal.
The sealing cone 1 includes a first cone surface 3 adjacent to the second sealing part and a second cone surface 4 disposed above the first cone surface 3. Specifically, the taper of the first conical surface is 16 degrees, and the taper of the second conical surface is 19 degrees. According to the invention, the 19-degree conical surface is added on the sealing conical surface, so that on one hand, the larger interference is reduced to the minimum on the premise of ensuring sealing, the gap between the end surface of the valve body and the end surface of the valve cover can be reduced to the minimum, and on the other hand, the occurrence of the teeterboard phenomenon can be effectively avoided, thereby improving the positioning capability of the sealing joint and avoiding the sealing conical surface from being crushed.
In operation, the upper and lower flat surfaces 10a, 10b of the first seal portion 10 and the second tapered surface 4 are brought into contact with the valve body 101 and the valve cover 102, respectively, and the first stress distribution region 5 is formed in the vicinity of the upper and lower flat surfaces, and the second stress distribution region 6 is formed in the vicinity of the second tapered surface.
The working principle of the invention is as follows:
1. under the action of external force F, the force is transferred to the sealing joint through the valve body and the valve cover.
2. Under the action of external force, the main seal of the sealing joint is formed by elastically deforming the upper surface and the lower surface of a rectangle, the sealing force is provided by the outside and is a constant value, the sealing joint cannot change due to fluctuation of pressure in the cavity, and the sealing joint can bear 5000Psi working pressure.
3. When the pressure in the cavity is not available, the sealing conical surface is supported by the arc surface to elastically deform, and the sealing of the conical surface at the position is self-sealing, so that the sealing force at the conical surface is gradually increased along with the gradual increase of the pressure in the carrier cavity, the sealing force at the conical surface is changed along with the fluctuation of the pressure in the carrier cavity, the sealing is more and more reliable along with the increase of the force, and the sealing at the position can bear 20000Psi working pressure.
The foregoing description is only illustrative of the preferred embodiments of the invention, and is not intended to limit the scope of the invention, so that all changes and modifications that come within the meaning and range of equivalents of the structures, features and principles of the invention will be suggested to one skilled in the art without departing from the spirit and purview of the invention.
Claims (3)
1. A sealing joint for use between a valve body and a valve cover, characterized by: a first sealing part concentrically arranged with the valve body and a second sealing part arranged on the step surface of the valve body; the first sealing portion is substantially elliptical in cross-section and the second sealing portion is substantially rectangular in cross-section;
the first sealing part consists of a sealing conical surface arranged on the outer wall of the joint and an arc surface arranged on the inner wall of the joint and used for supporting the sealing conical surface, and the sealing conical surface and the arc surface have equal and opposite transverse component forces at the stress positions;
the second sealing part is annular and extends outwards from the middle part of the sealing conical surface;
when the sealing conical surface is acted by force, the sealing conical surface generates bending deformation, and the circular arc surface plays a role in supporting the sealing conical surface, so that the plastic deformation of the sealing conical surface is converted into elastic deformation;
the sealing conical surface of the first sealing part comprises a first conical surface close to the second sealing part and a second conical surface arranged above the first conical surface, and the taper of the first conical surface is smaller than that of the second conical surface.
2. A sealing joint for use between a valve body and a bonnet as defined in claim 1, wherein: the taper of the first conical surface is 16 degrees, and the taper of the second conical surface is 19 degrees.
3. A sealing joint for use between a valve body and a bonnet as claimed in claim 1 or claim 2, wherein: when the valve is in operation, the upper plane and the lower plane of the first sealing part and the second conical surface are respectively contacted with the valve body and the valve cover, so that a first stress distribution area is formed near the upper plane and the lower plane, and a second stress distribution area is formed near the second conical surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710893302.XA CN107504244B (en) | 2017-09-28 | 2017-09-28 | Sealing joint used between valve body and valve cover |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710893302.XA CN107504244B (en) | 2017-09-28 | 2017-09-28 | Sealing joint used between valve body and valve cover |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107504244A CN107504244A (en) | 2017-12-22 |
| CN107504244B true CN107504244B (en) | 2023-08-25 |
Family
ID=60699422
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710893302.XA Active CN107504244B (en) | 2017-09-28 | 2017-09-28 | Sealing joint used between valve body and valve cover |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107504244B (en) |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11336905A (en) * | 1998-05-28 | 1999-12-07 | Ckd Corp | Seal structure of valve |
| JP2006250157A (en) * | 2005-03-08 | 2006-09-21 | Nok Corp | Packing for bellows |
| CN201065934Y (en) * | 2007-07-12 | 2008-05-28 | 广州机械科学研究院 | Drum-shape sealing ring |
| CN201705929U (en) * | 2010-06-29 | 2011-01-12 | 青岛开世密封工业有限公司 | Seal ring with groove for reducing pressure changing |
| CN202629128U (en) * | 2012-01-29 | 2012-12-26 | 苏州道森钻采设备股份有限公司 | Sealing ring with double conical surfaces |
| CN202992166U (en) * | 2012-12-17 | 2013-06-12 | 潍柴动力西港新能源发动机有限公司 | Seal washer |
| CN203868315U (en) * | 2014-04-30 | 2014-10-08 | 天津市永信橡塑制品有限责任公司 | Double-side positioning sealing ring |
| CN203880175U (en) * | 2014-05-15 | 2014-10-15 | 章华 | Partial electroplating anti-corrosion layer of valve middle opening seal part |
| CN104344072A (en) * | 2013-08-07 | 2015-02-11 | 珠海格力电器股份有限公司 | Stop valve sealing member, stop valve, air conditioner and heat pump water heater |
| CN104913109A (en) * | 2015-05-25 | 2015-09-16 | 蚌埠南自仪表有限公司 | One-way valve with elastic sealing structure |
-
2017
- 2017-09-28 CN CN201710893302.XA patent/CN107504244B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11336905A (en) * | 1998-05-28 | 1999-12-07 | Ckd Corp | Seal structure of valve |
| JP2006250157A (en) * | 2005-03-08 | 2006-09-21 | Nok Corp | Packing for bellows |
| CN201065934Y (en) * | 2007-07-12 | 2008-05-28 | 广州机械科学研究院 | Drum-shape sealing ring |
| CN201705929U (en) * | 2010-06-29 | 2011-01-12 | 青岛开世密封工业有限公司 | Seal ring with groove for reducing pressure changing |
| CN202629128U (en) * | 2012-01-29 | 2012-12-26 | 苏州道森钻采设备股份有限公司 | Sealing ring with double conical surfaces |
| CN202992166U (en) * | 2012-12-17 | 2013-06-12 | 潍柴动力西港新能源发动机有限公司 | Seal washer |
| CN104344072A (en) * | 2013-08-07 | 2015-02-11 | 珠海格力电器股份有限公司 | Stop valve sealing member, stop valve, air conditioner and heat pump water heater |
| CN203868315U (en) * | 2014-04-30 | 2014-10-08 | 天津市永信橡塑制品有限责任公司 | Double-side positioning sealing ring |
| CN203880175U (en) * | 2014-05-15 | 2014-10-15 | 章华 | Partial electroplating anti-corrosion layer of valve middle opening seal part |
| CN104913109A (en) * | 2015-05-25 | 2015-09-16 | 蚌埠南自仪表有限公司 | One-way valve with elastic sealing structure |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107504244A (en) | 2017-12-22 |
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