CN110939779A - Valve packing sealing device - Google Patents
Valve packing sealing device Download PDFInfo
- Publication number
- CN110939779A CN110939779A CN201811118725.5A CN201811118725A CN110939779A CN 110939779 A CN110939779 A CN 110939779A CN 201811118725 A CN201811118725 A CN 201811118725A CN 110939779 A CN110939779 A CN 110939779A
- Authority
- CN
- China
- Prior art keywords
- valve
- packing
- cavity
- sealing ring
- stuffing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000012856 packing Methods 0.000 title claims abstract description 73
- 238000007789 sealing Methods 0.000 title claims abstract description 55
- 239000002274 desiccant Substances 0.000 claims abstract description 26
- 210000004907 gland Anatomy 0.000 claims abstract description 22
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 21
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 21
- 239000001301 oxygen Substances 0.000 claims abstract description 21
- 238000001035 drying Methods 0.000 claims abstract description 17
- 238000002347 injection Methods 0.000 claims description 8
- 239000007924 injection Substances 0.000 claims description 8
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical group O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 4
- GUJOJGAPFQRJSV-UHFFFAOYSA-N dialuminum;dioxosilane;oxygen(2-);hydrate Chemical compound O.[O-2].[O-2].[O-2].[Al+3].[Al+3].O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O GUJOJGAPFQRJSV-UHFFFAOYSA-N 0.000 claims description 4
- 239000002808 molecular sieve Substances 0.000 claims description 4
- 229910052901 montmorillonite Inorganic materials 0.000 claims description 4
- 239000000741 silica gel Substances 0.000 claims description 4
- 229910002027 silica gel Inorganic materials 0.000 claims description 4
- URGAHOPLAPQHLN-UHFFFAOYSA-N sodium aluminosilicate Chemical compound [Na+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O URGAHOPLAPQHLN-UHFFFAOYSA-N 0.000 claims description 4
- 229920001971 elastomer Polymers 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 9
- 230000005518 electrochemistry Effects 0.000 abstract 1
- 239000000945 filler Substances 0.000 description 19
- 238000006056 electrooxidation reaction Methods 0.000 description 9
- 239000010425 asbestos Substances 0.000 description 7
- 229910052895 riebeckite Inorganic materials 0.000 description 7
- 230000007797 corrosion Effects 0.000 description 6
- 238000005260 corrosion Methods 0.000 description 6
- 238000010521 absorption reaction Methods 0.000 description 4
- 238000009434 installation Methods 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 239000010439 graphite Substances 0.000 description 3
- 229910002804 graphite Inorganic materials 0.000 description 3
- -1 sulfur ions Chemical class 0.000 description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 2
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 description 2
- 238000005034 decoration Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 2
- 239000004810 polytetrafluoroethylene Substances 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 description 1
- 229920000049 Carbon (fiber) Polymers 0.000 description 1
- MBMLMWLHJBBADN-UHFFFAOYSA-N Ferrous sulfide Chemical compound [Fe]=S MBMLMWLHJBBADN-UHFFFAOYSA-N 0.000 description 1
- JLVVSXFLKOJNIY-UHFFFAOYSA-N Magnesium ion Chemical compound [Mg+2] JLVVSXFLKOJNIY-UHFFFAOYSA-N 0.000 description 1
- 239000001110 calcium chloride Substances 0.000 description 1
- 229910001628 calcium chloride Inorganic materials 0.000 description 1
- 239000004917 carbon fiber Substances 0.000 description 1
- 239000003518 caustics Substances 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 229910001425 magnesium ion Inorganic materials 0.000 description 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000010137 moulding (plastic) Methods 0.000 description 1
- 231100000956 nontoxicity Toxicity 0.000 description 1
- 229910001414 potassium ion Inorganic materials 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 229910001415 sodium ion Inorganic materials 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Images
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
- F16K41/02—Spindle sealings with stuffing-box ; Sealing rings
-
- 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
- F16K25/00—Details relating to contact between valve members and seats
- F16K25/04—Arrangements for preventing erosion, not otherwise provided for
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Details Of Valves (AREA)
Abstract
The invention discloses a valve packing sealing device, which comprises a valve body, a valve rod, a valve cover and a packing box, wherein the valve cover is connected to the upper end of the valve body; the stuffing box is arranged between the valve rod and the valve cover to perform dynamic sealing on the valve; the stuffing box sequentially comprises a stuffing gland, a sealing ring, a first stuffing cavity, a drying cavity and a second stuffing cavity from top to bottom; wherein the packing gland is connected with the upper end surface of the valve cover and sleeved on the valve rod, packing is arranged in the first packing cavity and the second packing cavity, and a drying agent is arranged in the drying cavity. The invention aims to provide a valve packing sealing device, which can be used for keeping the packing dry, reducing the water content and increasing the oxygen concentration between the packing and a valve rod by optimizing the structure of the packing sealing device, so that the problem that the packing corrodes the valve rod by electrochemistry is fundamentally solved.
Description
Technical Field
The invention belongs to the technical field of valve structures, and particularly relates to a valve packing sealing device.
Background
The dynamic sealing of the valve is always the key and difficult point of the valve industry, and the packing sealing structure is the most widely applied dynamic sealing structure in the valve and is generally used for sealing between a valve cover and a valve rod of the valve. After the packing is filled into the stuffing box, the packing is compressed axially by the gland to generate radial force and is in close contact with the valve rod. Because of this, the corrosion of the valve rod is often caused by the packing, and the most widely used packing at present is the packing using asbestos as a base body, such as graphite asbestos packing, oil-immersed asbestos packing, and rubber asbestos packing. Asbestos material contains a certain amount of chloride ions, potassium ions, sodium ions, magnesium ions and the like, graphite contains impurities such as iron sulfide and the like, which are corrosion factors, and water and steam are conductive substances and can further communicate with an electrochemical corrosion circuit. Valves in the warehouse, because of the moisture of the filling or the air, cause electrochemical corrosion. In addition, the lack of oxygen between the packing and the valve stem, the concentration of oxygen is different compared with the ambient environment, and the oxygen concentration cell is formed and becomes another form of electrochemical corrosion. Because the valve stem is typically made of a high quality material, its corrosion damage is unfortunately, especially if the valve stem stored in a warehouse is corroded first before it is used, causing unnecessary losses to the manufacturer.
The prior solution is that the valve is not provided with the packing during storage in a warehouse and is temporarily provided with the packing when in use, and although the solution can solve the problem of corrosion during the valve stem storage, the corrosion still occurs during the use. On the other hand, the installation of the filler needs professional technicians to complete, and the field installation needs a manufacturer to send an installation master to the field installation, so that the time and labor are wasted, and the cost of a user is increased.
Disclosure of Invention
The purpose of the invention is as follows: aiming at the defects in the prior art, the invention aims to provide a valve packing sealing device, which enables packing to be dry and reduce the water content by optimizing the structure of the packing sealing device, increases the oxygen concentration between the packing and a valve rod and fundamentally solves the problem that the packing electrochemically corrodes the valve rod.
The technical scheme is as follows: in order to achieve the purpose of the invention, the technical scheme adopted by the invention is as follows: a valve packing sealing device comprises a valve body, a valve rod, a valve cover and a packing box, wherein the valve cover is connected to the upper end of the valve body, and the valve rod is supported in the valve cover and stretches the inner cavity of the valve body; the stuffing box is arranged between the valve rod and the valve cover and used for dynamically sealing the valve; the stuffing box sequentially comprises a stuffing gland, a sealing ring, a first stuffing cavity, a drying cavity and a second stuffing cavity from top to bottom; wherein the packing gland is connected with the upper end surface of the valve cover and sleeved on the valve rod, packing is arranged in the first packing cavity and the second packing cavity, and a drying agent is arranged in the drying cavity.
Preferably, the seal ring is an O-ring or a lip seal.
Preferably, the drying agent in the drying cavity is a physical drying agent
Preferably, the physical drying agent is silica gel, montmorillonite or molecular sieve.
Preferably, a sealing ring with an H-shaped cross section is arranged in the drying cavity, the drying agent is placed in a cavity of the H-shaped sealing ring, and an opening of the cavity of the H-shaped sealing ring faces upwards and downwards.
Preferably, vertically placed annular springs are respectively arranged in the upper cavity and the lower cavity of the H-shaped sealing ring, and the annular springs extend out of the edge of the section of the H-shaped sealing ring by a distance of 1-3 mm.
Preferably, the packing gland and the valve cover are connected by adopting T-shaped bolts, stud bolts or swing bolts.
Preferably, an oxygen injection hole leading to the upper end face of the packing gland is formed in the bottom end face of the packing gland corresponding to the position of the sealing ring, and a hole plug is arranged in the oxygen injection hole in the upper end face of the packing gland.
Has the advantages that: compared with the prior art, the invention has the following advantages: through the structure of optimizing the packing box, the increase sets up the drier for keep dry between packing and the valve rod, lacked water and steam just also did not have the conducting material in the packing, just can not produce electrochemical corrosion to the valve rod, prolonged the save time of valve greatly, solved the valve and preserved and pack the problem to valve rod electrochemical corrosion during the use in the warehouse.
The design of the oxygen injection hole increases the oxygen concentration between the valve rod and the valve cover, reduces the oxygen concentration difference between the valve rod and the valve cover and the outside, does not form an oxygen concentration difference battery, and does not generate electrochemical corrosion.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
fig. 2 is an enlarged view of a portion of the upper structure of fig. 1.
Detailed Description
The invention will be further elucidated with reference to the drawing.
As shown in fig. 1 and 2, a valve packing sealing device comprises a valve body 1, a valve rod 2, a valve cover 3 and a packing box 4, wherein the valve cover 3 is connected to the upper end of the valve body 1, and the valve rod 2 is supported in the valve cover 3 and straightens the inner cavity of the valve body 1; the stuffing box 4 is arranged between the valve rod 2 and the valve cover 3 and movably seals the valve; the stuffing box 4 sequentially comprises a stuffing gland 41, a sealing ring 42, a first stuffing cavity 43, a drying cavity 44 and a second stuffing cavity 45 from top to bottom; wherein the packing gland 41 is connected with the upper end surface of the valve cover 3 and sleeved on the valve rod 2, packing is arranged in the first packing cavity 43 and the second packing cavity 45, and drying agent is arranged in the drying cavity 44. The desiccant can absorb the filler and the water vapor around the valve rod 2, so that the filler and the valve rod 2 are kept dry, the filler is lack of water and steam, and no conductive substance is left, so that the valve rod 2 cannot be subjected to electrochemical corrosion, the storage time of the valve is greatly prolonged, and the problems of storage of the valve in a warehouse and electrochemical corrosion of the filler on the valve rod 2 in the using process are solved.
The valve packing sealing device can be suitable for various valves with valve rods moving up and down and needing dynamic sealing, such as throttle valves, flat valves and the like.
The sealing ring 42 is used for ensuring that the filler in the stuffing box 4 is not leaked to cause environmental pollution, so the sealing ring 42 is an O-shaped rubber sealing ring or a lip-shaped sealing ring.
The desiccant in the drying chamber 44 can be selected from known chemical desiccants such as calcium sulfate and calcium chloride, which contain sulfur ions and chloride ions that cause corrosive substances, or physical desiccants such as silica gel, montmorillonite, molecular sieves are preferred in the present invention. Wherein the silica gel has high adsorption performance, good thermal stability, stable chemical property, higher mechanical strength and the like. The montmorillonite has the advantages of low price, no corrosion, no toxicity and no public nuisance, can be treated as common waste after being used, does not pollute the environment, can be naturally degraded, and can keep stable moisture absorption performance in various temperature environments; the moisture absorption performance is good, and the saturated moisture absorption rate is more than 50 percent of the self weight and is 1.5 times of that of the traditional desiccant. The molecular sieve is characterized in that under the condition of ultralow humidity, a large amount of water vapor in the environment can be absorbed, and the environment humidity is effectively controlled; the moisture absorption speed is very fast, and a large amount of water vapor is absorbed in a very short time.
Because the physical desiccant has no sealing function, the sealing between the valve cover 3 and the valve rod 2 at the position of the drying cavity 44 is lack, and the sealing performance at the position is poor, a sealing ring 441 with an H-shaped section is arranged in the drying cavity 44, the desiccant is placed in a cavity of the sealing ring 441 with the H-shaped section, and the drying of the filler above and below the drying cavity 44 by the desiccant is not influenced because the hole of the cavity of the sealing ring 441 with the H-shaped section is upward and downward, and in addition, the sealing function between the valve rod 2 and the valve cover 3 is good by the sealing ring 441 with the H-shaped section.
In order to improve the supporting force between the filler and the desiccant and prevent the filler from extruding and deforming the desiccant when the valve rod 2 moves up and down, vertically-arranged annular springs 442 are respectively arranged in the upper cavity and the lower cavity of the H-shaped sealing ring 441, and the annular springs 442 extend out of the edge of the section of the H-shaped sealing ring 441 by a distance of 1-3 mm. The ring spring 442 is a filament spring, occupies little space of the desiccant, and can provide support between the desiccant and the filler to prevent the desiccant from deforming under pressure without affecting the sealing effect of the filler.
Because the desiccant absorbs water and expands in volume, the packing gland 41 and the valve cover 3 are connected by adopting T-shaped bolts, stud bolts or swing bolts, and the gap between the packing gland 41 and the valve cover 3 can be adjusted.
In order to increase the oxygen concentration between the valve rod 2 and the valve cover 3, an oxygen injection hole 411 which leads to the upper end surface of the packing gland 41 is arranged on the bottom end surface of the packing gland 41 corresponding to the position of the sealing ring 42, the oxygen injection hole 411 is used for injecting high-concentration oxygen into a gap between the valve rod 2 and the valve cover 3, and the oxygen concentration difference between the valve rod 2 and the valve cover 3 and the outside is reduced, so that an oxygen concentration difference battery can not be formed, and electrochemical corrosion can not be generated. In order to prevent oxygen leakage, a hole plug 412 is provided in the oxygen injection hole 411 in the upper end surface of the packing gland 41.
The shape of the filler in the first filler cavity 43 and the second filler cavity 45 is round, square, trapezoid or V-shaped, and the filler is asbestos fiber filler, plastic molding filler, flexible graphite filler, or mixture of asbestos and polytetrafluoroethylene or woven filler of carbon fiber impregnated polytetrafluoroethylene.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (8)
1. A kind of valve packing sealing means, characterized by: the valve comprises a valve body (1), a valve rod (2), a valve cover (3) and a packing box (4), wherein the valve cover (3) is connected to the upper end of the valve body (1), and the valve rod (2) is supported in the valve cover (3) and straightens the inner cavity of the valve body (1); the stuffing box (4) is arranged between the valve rod (2) and the valve cover (3) and is used for dynamically sealing the valve; the stuffing box (4) sequentially comprises a stuffing gland (41), a sealing ring (42), a first stuffing cavity (43), a drying cavity (44) and a second stuffing cavity (45) from top to bottom; wherein the packing gland (41) is connected with the upper end surface of the valve cover (3) and sleeved on the valve rod (2), packing is arranged in the first packing cavity (43) and the second packing cavity (45), and drying agent is arranged in the drying cavity (44).
2. The valve packing seal of claim 1, wherein: the sealing ring (42) is an O-shaped rubber sealing ring or a lip-shaped sealing ring.
3. The valve packing seal of claim 1, wherein: the desiccant in the drying chamber (44) is a physical desiccant.
4. The valve packing seal of claim 3, wherein: the physical drying agent is silica gel, montmorillonite or molecular sieve.
5. The valve packing seal of claim 1, wherein: a sealing ring (441) with an H-shaped section is arranged in the drying cavity (44), a drying agent is placed in a cavity of the sealing ring (441), and an opening of the cavity of the sealing ring (441) is upward and downward.
6. The valve packing seal of claim 5, wherein: and vertically arranged annular springs (442) are respectively arranged in the upper cavity and the lower cavity of the H-shaped sealing ring (441), and the annular springs (442) extend out of the edge of the section of the H-shaped sealing ring (441) by a distance of 1-3 mm.
7. The valve packing seal of claim 1, wherein: the packing gland (41) and the valve cover (3) are connected by adopting T-shaped bolts, stud bolts or swing bolts.
8. The valve packing seal of claim 1, wherein: an oxygen injection hole (411) leading to the upper end face of the packing gland (41) is formed in the position, corresponding to the sealing ring (42), of the bottom end face of the packing gland (41), and a hole plug (412) is arranged in the oxygen injection hole (411) in the upper end face of the packing gland (41).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811118725.5A CN110939779A (en) | 2018-09-25 | 2018-09-25 | Valve packing sealing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811118725.5A CN110939779A (en) | 2018-09-25 | 2018-09-25 | Valve packing sealing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110939779A true CN110939779A (en) | 2020-03-31 |
Family
ID=69905297
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811118725.5A Pending CN110939779A (en) | 2018-09-25 | 2018-09-25 | Valve packing sealing device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110939779A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4886241A (en) * | 1987-09-16 | 1989-12-12 | Fisher Controls International, Inc. | Valve stem packing containment for high pressure, high temperature |
| CN101033804A (en) * | 2007-03-31 | 2007-09-12 | 浙江维都利阀门制造有限公司 | Zirconium material anti-erosion cut-off valve |
| CN106402477A (en) * | 2016-11-26 | 2017-02-15 | 江苏新思维信息系统工程有限公司 | Valve packing seal device |
| CN208886114U (en) * | 2018-09-25 | 2019-05-21 | 江苏三益石油装备有限公司 | A kind of valve packing seal device |
-
2018
- 2018-09-25 CN CN201811118725.5A patent/CN110939779A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4886241A (en) * | 1987-09-16 | 1989-12-12 | Fisher Controls International, Inc. | Valve stem packing containment for high pressure, high temperature |
| CN101033804A (en) * | 2007-03-31 | 2007-09-12 | 浙江维都利阀门制造有限公司 | Zirconium material anti-erosion cut-off valve |
| CN106402477A (en) * | 2016-11-26 | 2017-02-15 | 江苏新思维信息系统工程有限公司 | Valve packing seal device |
| CN208886114U (en) * | 2018-09-25 | 2019-05-21 | 江苏三益石油装备有限公司 | A kind of valve packing seal device |
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