CN208107261U - A kind of screw bonnet sealing structure - Google Patents
A kind of screw bonnet sealing structure Download PDFInfo
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- CN208107261U CN208107261U CN201820333997.6U CN201820333997U CN208107261U CN 208107261 U CN208107261 U CN 208107261U CN 201820333997 U CN201820333997 U CN 201820333997U CN 208107261 U CN208107261 U CN 208107261U
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- valve
- valve body
- flap
- deck
- valve deck
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Abstract
The application belongs to valve technology field, and in particular to a kind of screw bonnet sealing structure.A kind of screw bonnet sealing structure, including flap, valve body, valve deck, valve rod, gasket, are arranged a gasket between valve body and valve deck, and valve deck bottom is that there are biggish gaps at plane, with valve body escape.The remarkable result of the application is：Eliminate the conical surface seal of valve body and valve deck, and increase a gasket at valve body top and valve deck screw thread step, due to bonnet lower between valve body withdrawing groove location and valve body there are biggish gap, which makes the loose sealing effect that will not influence gasket between valve body and valve deck of screw thread caused by changing due to temperature and pressure；Valve deck diameter of bore is greater than flap outer circle 0.5-1mm, and valve deck inner hole no longer play the guiding role, and flap outer circle guide surface is changed to valve body inner bore, reduces the cantilever beam length of flap guiding, reduces flap deflection, is conducive to flap sealing.
Description
Technical field
The application belongs to valve technology field, and in particular to a kind of screw bonnet sealing structure.
Background technique
Smaller diameter valve is passed through frequently with screw bonnet sealing structure, and common screw bonnet sealing structure is as shown in Figure 1, valve
Lid has a conical surface in bonnet lower, it is close to form first of conical surface after the conical surface and valve body contact by being threaded into valve body
Envelope is sealed weldering at valve body middle chamber outer surface and valve deck mating surface and forms second sealing, flap outer circle and valve deck inner hole
It matches to form guide frame, valve rod drives flap to move up and down by T connector.
The structure has the disadvantage that：
1, flap outer circle is oriented in the inner hole that flap top is matched with valve deck, and the position of guiding is on the upper side, works as valve
Apparent cantilever beam will be formed when tilting or lie down installation, when flap is in the open state, under medium effect, flap deflection
It measures bigger, is unfavorable for valve seal.
2, in temperature, pressure change, screw thread can usually relax, so that the conical surface seal between bonnet lower and valve body loses
It imitates, at such valve body middle chamber outer circle and the sealing welding of valve deck will directly bear pressure medium, so that there are stress increases for the weld seam
And the risk to fail.
Summary of the invention
The purpose of the application is in view of the drawbacks of the prior art, to provide a kind of screw bonnet sealing structure, the structure not by
The relaxation of screw thread caused by temperature and pressure changes influences, it is ensured that valve bonnet seal performance；And flap outer circle is modified to by valve body
Inner hole guiding is oriented to position in flap outer circle lower part, reduces the length of flap cantilever beam, reduce flap deflection, favorably
In flap sealing performance.
The technical solution of the application is：A kind of screw bonnet sealing structure, including flap, valve body, valve deck, valve rod, sealing
Pad, is arranged a gasket between valve body and valve deck, and valve deck bottom is that there are biggish at plane, with valve body escape
Gap.
A kind of screw bonnet sealing structure as described above, wherein the biggish gap refers to 1~2mm.
A kind of screw bonnet sealing structure as described above, wherein flap outer circle and valve body inner bore cooperation are oriented to, in valve deck
Bore dia is greater than flap outer circle 0.5-1mm.
The remarkable result of the application is：The conical surface seal of valve body and valve deck is eliminated, and on valve body top and valve deck screw thread
Increase a gasket at step, it, should since there are biggish gaps between valve body withdrawing groove location and valve body for bonnet lower
Gap imitates the sealing that screw thread relaxation will not influence gasket between valve body and valve deck caused by changing due to temperature and pressure
Fruit；Valve deck diameter of bore is greater than flap outer circle 0.5-1mm, and valve deck inner hole no longer play the guiding role, flap outer circle guide surface is changed
For valve body inner bore, reduce the cantilever beam length of flap guiding, reduce flap deflection, is conducive to flap sealing.
Detailed description of the invention
Fig. 1 screw bonnet sealing structure in the prior art.
The improved screw bonnet sealing structure of Fig. 2.
In figure：1 flap；2 valve bodies；3 valve decks；4 valve rods；5 gaskets.
Specific embodiment
The application is described further with reference to the accompanying drawing：
As shown in Fig. 2, a kind of screw bonnet sealing structure, valve deck bottom be plane, with valve body escape at there are compared with
Big gap；Increase a gasket between valve body and valve deck；Flap outer circle and valve body inner bore cooperation are oriented to, and valve deck inner hole is straight
Diameter is greater than flap outer circle 0.5-1mm.
Realize that technical characterstic of the invention has：A gasket is designed at valve body top and valve deck screw thread step, due to
There are biggish gap between valve body withdrawing groove location and valve body, which to change due to temperature and pressure bonnet lower
Caused screw thread relaxation will not influence the sealing effect of gasket between valve body and valve deck；Since flap outer circle guide surface being changed to
Valve body inner bore reduces the cantilever beam length of flap guiding, reduces flap deflection, is conducive to flap sealing.
Claims (3)
1. a kind of screw bonnet sealing structure, including flap, valve body, valve deck, valve rod, gasket, it is characterised in that：Valve body with
One gasket is set between valve deck, and valve deck bottom is that there are biggish gaps at plane, with valve body escape.
2. a kind of screw bonnet sealing structure as described in claim 1, it is characterised in that：The biggish gap refers to 1
~2mm.
3. a kind of screw bonnet sealing structure as claimed in claim 2, it is characterised in that：Flap outer circle and valve body inner bore cooperate
Guiding, valve deck diameter of bore are greater than flap outer circle 0.5-1mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820333997.6U CN208107261U (en) | 2018-03-12 | 2018-03-12 | A kind of screw bonnet sealing structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820333997.6U CN208107261U (en) | 2018-03-12 | 2018-03-12 | A kind of screw bonnet sealing structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208107261U true CN208107261U (en) | 2018-11-16 |
Family
ID=64126205
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820333997.6U Active CN208107261U (en) | 2018-03-12 | 2018-03-12 | A kind of screw bonnet sealing structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208107261U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110260015A (en) * | 2018-03-12 | 2019-09-20 | 中核苏阀科技实业股份有限公司 | A kind of screw bonnet sealing structure |
-
2018
- 2018-03-12 CN CN201820333997.6U patent/CN208107261U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110260015A (en) * | 2018-03-12 | 2019-09-20 | 中核苏阀科技实业股份有限公司 | A kind of screw bonnet sealing structure |
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