CN211779050U - Valve core and valve seat sealing structure - Google Patents
Valve core and valve seat sealing structure Download PDFInfo
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- CN211779050U CN211779050U CN202020348802.2U CN202020348802U CN211779050U CN 211779050 U CN211779050 U CN 211779050U CN 202020348802 U CN202020348802 U CN 202020348802U CN 211779050 U CN211779050 U CN 211779050U
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Abstract
The utility model relates to a valve core and valve seat sealing structure, which comprises a valve core and a valve seat, wherein an annular wedge-shaped boss with an angle of beta is designed on the valve core, a sealing groove with an angle of alpha matched with the valve core is designed on the valve seat, when the valve is closed, the wedge-shaped boss on the valve core is contacted with the groove surface of the valve seat to form two sealing surfaces, and the ANSI FCI/70-2 VI sealing requirement can be realized; when the valve core and the valve seat are separated, the valve core and the valve seat are in a small-opening working condition of the valve, the medium differential pressure is often very high, 4-level pressure reduction can be realized by the sealing structure according to the pressure reduction principle, and the problems of damage to the sealing surface and damage to the high differential pressure caused by the small-opening working condition of the valve are effectively solved. The metal sealing structure can realize high sealing grade, can solve the problem of sealing surface damage under the working condition of small opening degree, and prolongs the service life of the valve.
Description
Technical Field
The utility model relates to a seal structure specifically is a case disk seat seal structure.
Background
At present, in domestic regulating valves, the sealing surface structures of a valve core and a valve seat are divided into soft sealing and hard sealing, the soft sealing can meet the requirement of ANSI FCI/70-2 VI level sealing, but the soft sealing can only meet the use under the working condition within 200 ℃ due to the limitation of materials, while a metal sealing mechanism can bear the use under the working condition of higher temperature, but the leakage of the valve core and the valve seat can only meet the requirement of ANSI FCI/70-2V level, and the high sealing grade is difficult to achieve. In the case of a tight cut-off level, a high-pressure difference area is formed at the sealing surface at the opening moment of the valve, and when a medium passes through the high-pressure difference area, flash evaporation, cavitation damage and scouring are formed, so that the sealing surface of the valve is seriously damaged, and the defect of short service life of the valve is caused.
In conclusion, when the metal sealing is adopted, the pressure reduction is realized, so that the service life of the valve is prolonged.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is: how to achieve pressure reduction when metal sealing is employed;
in order to solve the technical problem, the utility model discloses a following technical scheme:
the utility model relates to a valve core and valve seat sealing structure, which comprises a valve body; a valve seat and a valve core in contact with the valve seat are arranged in the valve body; the lower end face of the valve core is provided with an annular boss, and the upper end face of the valve seat is provided with a groove matched with the boss; two side edges of the boss are abutted and sealed with two side walls of the groove.
Seen from the vertical section direction, the two side edges of the boss are abutted against the two side walls of the groove to realize double sealing of the valve seat and the valve core, when the valve is in small opening, the valve core is separated from the valve seat, a medium flows through the gap between the boss and the groove, and the medium is reversed for multiple times when flowing, so that buffering is realized, and the problems of damage to a sealing surface and damage to a high differential pressure caused by the working condition of small opening of the valve are solved.
How to realize the 4-level buffering of the valve core and the valve seat, the utility model adopts the wedge-shaped cross section of the lug boss;
that is to say, the cross-sectional shape of recess also is the breach with wedge matched with, when the medium passed through from boss and recess, has carried out 4 commutations, has realized the 4 grades of cushions of case disk seat.
In order to specifically explain the matching relationship between the groove and the boss, the height of the boss is h, the width of the bottom of the boss is C, and the included angle between two side edges of the boss and a vertical line is beta; the groove width of the groove is F, the depth of the groove is E, and the included angle between the two side walls of the groove and a vertical line is alpha; wherein β - α -1 °, C-0.6F, h-0.8E; beta is less than alpha, so that the lug boss can be conveniently inserted into the groove.
In order to realize the hardness difference between the materials of the valve core boss and the valve seat groove, the hardness of the boss is greater than that of the groove; preferably, the boss is made of stellite Lai 12 alloy, and the groove is made of stellite Lai 6 alloy.
The utility model has the advantages that: the utility model relates to a valve core and valve seat sealing structure, which comprises a valve core and a valve seat, wherein an annular wedge-shaped boss with an angle of beta is designed on the valve core, a sealing groove with an angle of alpha matched with the valve core is designed on the valve seat, when the valve is closed, the wedge-shaped boss on the valve core is contacted with the groove surface of the valve seat to form two sealing surfaces, and the ANSI FCI/70-2 VI sealing requirement can be realized; when the valve core and the valve seat are separated, the valve core and the valve seat are in a small-opening working condition of the valve, the medium differential pressure is often very high, 4-level pressure reduction can be realized by the sealing structure according to the pressure reduction principle, and the problems of damage to the sealing surface and damage to the high differential pressure caused by the small-opening working condition of the valve are effectively solved. The metal sealing structure can realize high sealing grade, can solve the problem of sealing surface damage under the working condition of small opening degree, and prolongs the valve sight.
Drawings
The present invention will be further explained with reference to the drawings and examples.
Fig. 1 is a schematic structural diagram of the present invention;
FIG. 2 is a schematic view of the valve core structure of the present invention;
FIG. 3 is an enlarged view at M of FIG. 2;
FIG. 4 is a schematic view of the valve seat structure of the present invention;
FIG. 5 is an enlarged view of FIG. 4N;
fig. 6 shows the valve core and valve seat of the present invention, wherein the arrow indicates the flow direction of the medium.
In the figure: 1-valve core, 2-valve seat, 3-boss and 4-groove.
Detailed Description
The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic drawings and illustrate the basic structure of the present invention only in a schematic manner, and thus show only the components related to the present invention.
As shown in fig. 1-6, the utility model relates to a valve core and valve seat sealing structure, which comprises a valve body; a valve seat 2 and a valve core 1 contacted with the valve seat 2 are arranged in the valve body; the lower end face of the valve core 1 is provided with an annular boss 3, and the upper end face of the valve seat 2 is provided with a groove 4 matched with the boss 3; two side edges of the boss 3 are abutted and sealed with two side walls of the groove 4.
Seen from the vertical section direction, the two side edges of the boss are abutted against the two side walls of the groove to realize double sealing of the valve seat and the valve core, when the valve is in small opening, the valve core is separated from the valve seat, a medium flows through the gap between the boss and the groove, and the medium is reversed for multiple times when flowing, so that buffering is realized, and the problems of damage to a sealing surface and damage to a high differential pressure caused by the working condition of small opening of the valve are solved.
As shown in fig. 2-5, how to realize 4-level buffering of the valve core and the valve seat, the cross section of the boss 3 is wedge-shaped;
that is to say, the cross-sectional shape of recess also is the breach with wedge matched with, when the medium passed through from boss and recess, has carried out 4 commutations, has realized the 4 grades of cushions of case disk seat.
As shown in fig. 3 and 5, in order to specifically illustrate the matching relationship between the groove and the boss, the height of the boss 3 is h, the width of the bottom is C, and the included angle between the two side edges of the boss 3 and the vertical line is β; the groove width of the groove 4 is F, the depth of the groove 4 is E, and the included angle between two side walls of the groove 4 and a vertical line is alpha; wherein β - α -1 °, C-0.6F, h-0.8E; beta is less than alpha, so that the lug boss can be conveniently inserted into the groove.
In designing the structure, the valve seat diameter d is first determined and the relevant dimensions of the valve seat recess can be designed according to the following method: p is 1.1d, F is 0.05d, E is 0.7F, α is 23 °, R is 0.3 to 0.5; the spool boss size can be designed according to the following method: p is 1.1d, a is 1.05P, C is 0.6F, β is 22 °, r is 0.25-0.3;
p is the distance between two central lines of the groove or the boss, R is the fillet radius at the groove, R is the fillet radius at the boss, and A is the diameter of the outer wall of the boss.
As shown in fig. 6, in order to realize the hardness difference between the materials of the valve core boss and the valve seat groove, the hardness of the boss 3 is greater than that of the groove 4; preferably, the boss 3 is made of stellite Lai 12 alloy, and the groove 4 is made of stellite Lai 6 alloy.
The utility model relates to a valve core and valve seat sealing structure, which comprises a valve core and a valve seat, wherein an annular wedge-shaped boss with an angle of beta is designed on the valve core, a sealing groove with an angle of alpha matched with the valve core is designed on the valve seat, when the valve is closed, the wedge-shaped boss on the valve core is contacted with the groove surface of the valve seat to form two sealing surfaces, and the ANSI FCI/70-2 VI sealing requirement can be realized; when the valve core and the valve seat are separated, the valve core and the valve seat are in a small-opening working condition of the valve, the medium differential pressure is often very high, 4-level pressure reduction can be realized by the sealing structure according to the pressure reduction principle, and the problems of damage to the sealing surface and damage to the high differential pressure caused by the small-opening working condition of the valve are effectively solved. The metal sealing structure can realize high sealing grade, can solve the problem of sealing surface damage under the working condition of small opening degree, and prolongs the service life of the valve.
In light of the foregoing, it will be apparent to those skilled in the art from this disclosure that various changes and modifications can be made without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.
Claims (4)
1. The utility model provides a case disk seat seal structure which characterized in that: comprises a valve body;
a valve seat and a valve core in contact with the valve seat are arranged in the valve body;
an annular boss is arranged on the lower end face of the valve core, and a groove matched with the boss is formed in the upper end face of the valve seat;
two side edges of the boss are abutted and sealed with two side walls of the groove.
2. The valve element and valve seat sealing structure according to claim 1, wherein: the section of the boss is wedge-shaped.
3. The valve element and valve seat sealing structure according to claim 2, wherein: the height of the boss is h, the width of the bottom of the boss is C, and the included angle between two side edges of the boss and a vertical line is beta;
the groove width of the groove is F, the depth of the groove is E, and the included angle between two side walls of the groove and a vertical line is alpha;
wherein β ═ α -1 °, C ═ 0.6F, and h ═ 0.8E.
4. The valve element and valve seat sealing structure according to claim 1, wherein: the boss hardness is greater than the groove hardness.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020348802.2U CN211779050U (en) | 2020-03-19 | 2020-03-19 | Valve core and valve seat sealing structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020348802.2U CN211779050U (en) | 2020-03-19 | 2020-03-19 | Valve core and valve seat sealing structure |
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| Publication Number | Publication Date |
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| CN211779050U true CN211779050U (en) | 2020-10-27 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202020348802.2U Active CN211779050U (en) | 2020-03-19 | 2020-03-19 | Valve core and valve seat sealing structure |
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| CN (1) | CN211779050U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112901784A (en) * | 2021-03-04 | 2021-06-04 | 铜陵市宏飞科技有限公司 | Diaphragm type mud valve based on wiper mechanism |
-
2020
- 2020-03-19 CN CN202020348802.2U patent/CN211779050U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112901784A (en) * | 2021-03-04 | 2021-06-04 | 铜陵市宏飞科技有限公司 | Diaphragm type mud valve based on wiper mechanism |
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