CN110778741B - Single-valve-seat bidirectional sealing structure and ball valve - Google Patents
Single-valve-seat bidirectional sealing structure and ball valve Download PDFInfo
- Publication number
- CN110778741B CN110778741B CN201911205383.5A CN201911205383A CN110778741B CN 110778741 B CN110778741 B CN 110778741B CN 201911205383 A CN201911205383 A CN 201911205383A CN 110778741 B CN110778741 B CN 110778741B
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- valve
- valve seat
- cavity
- seat
- ball
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- 238000007789 sealing Methods 0.000 title claims abstract description 58
- 230000002457 bidirectional effect Effects 0.000 title abstract description 23
- 238000009434 installation Methods 0.000 claims description 3
- 238000012423 maintenance Methods 0.000 abstract description 6
- 238000004519 manufacturing process Methods 0.000 abstract description 6
- 238000010586 diagram Methods 0.000 description 3
- 230000006978 adaptation Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000005192 partition Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 239000003208 petroleum Substances 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
- F16K5/00—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary
- F16K5/06—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary with plugs having spherical surfaces; Packings therefor
- F16K5/0663—Packings
- F16K5/0689—Packings between housing and plug
-
- 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
- F16K27/06—Construction of housing; Use of materials therefor of taps or cocks
- F16K27/067—Construction of housing; Use of materials therefor of taps or cocks with spherical plugs
-
- 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
- F16K5/00—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary
- F16K5/08—Details
-
- 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
- F16K5/00—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary
- F16K5/08—Details
- F16K5/14—Special arrangements for separating the sealing faces or for pressing them together
- F16K5/20—Special arrangements for separating the sealing faces or for pressing them together for plugs with spherical surfaces
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Taps Or Cocks (AREA)
Abstract
The invention discloses a single valve seat bidirectional sealing structure and a ball valve, which relate to the technical field of valve sealing and comprise the following components: a valve ball, a valve seat and a valve body; the valve seat is in sliding sealing fit with the valve body, and a closed cavity is formed at the sealing fit position; the valve seat comprises a valve seat front end and a valve seat rear end, and a sealing ring matched with the valve ball is arranged on the valve seat rear end; the valve body is provided with a flow passage, and the flow passage is configured to: when the medium pressure of the front cavity is greater than or equal to that of the rear cavity, the flow channel enables the front cavity to be communicated with the closed cavity, so that the force of the medium acting on the front end of the valve seat is greater than that of the rear end; when the medium pressure of the front cavity is smaller than that of the rear cavity, the flow passage enables the rear cavity to be communicated with the closed cavity, so that the force of the medium acting on the front end of the valve seat is larger than that of the rear end. The invention realizes the bidirectional sealing of the valve through the single valve seat, simplifies the structure of the traditional double valve seat bidirectional sealing valve, reduces the volume and the weight and saves the manufacturing and maintenance cost.
Description
Technical Field
The invention relates to the technical field of valve sealing, in particular to a single valve seat bidirectional sealing structure and a ball valve.
Background
Ball valves have wide application in the fields of petroleum, chemical industry, energy, mineral products and the like, and are important component parts in industrial pipelines. One type is called a partition ball valve, and the main function of the partition ball valve is to quickly isolate a damaged pipe section when a pipeline leaks, so that the safety of the pipeline and field personnel is ensured. The ball valve generally adopts a bidirectional sealing mode so as to ensure that leakage points can be effectively isolated no matter whether leakage occurs in front of or behind the valve.
At present, two sealing valve seats are arranged on two sides of a valve ball of a valve to respectively seal media in two directions of the valve, so that bidirectional sealing is realized as a whole. The valve realizing the bidirectional sealing through the double valve seats has the advantages of large volume, heavy weight, difficult assembly and high manufacturing and maintenance cost due to the two sealing valve seats.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a single valve seat bidirectional sealing structure and a ball valve, which are used for solving the problems of large volume, heavy weight and high manufacturing and maintenance cost of two sealing valve seats arranged on two sides of a valve ball of a valve in the prior art.
In order to achieve the above purpose, the invention adopts the following technical scheme: a single valve seat bi-directional seal structure comprising: a valve ball, a valve seat and a valve body;
The valve seat is in sliding sealing fit with the valve body, and a closed cavity is formed at the sealing fit position; the valve seat comprises a valve seat front end far away from the valve ball and a valve seat rear end close to the valve ball, a sealing ring matched with the valve ball is arranged at the valve seat rear end, and the sealing ring divides an inner cavity of the valve body into a front cavity and a rear cavity;
The valve body is provided with a flow passage, and the flow passage is configured to: when the medium pressure of the front cavity is greater than or equal to that of the rear cavity, the flow channel enables the front cavity to be communicated with the closed cavity, so that the force of the medium acting on the front end of the valve seat is greater than that of the rear end; when the medium pressure of the front cavity is smaller than or equal to that of the rear cavity, the flow passage enables the rear cavity to be communicated with the closed cavity, so that the force of the medium acting on the front end of the valve seat is larger than that of the rear end.
On the basis of the technical scheme, the valve seat is of an annular stepped shaft structure and is provided with a first outer annular surface and a second outer annular surface; the valve body is provided with a first inner hole surface and a second inner hole surface, the first outer ring surface and the second outer ring surface are in sliding sealing fit with the first inner hole surface and the second inner hole surface, and the closed cavity is formed at the stepped shaft structure.
On the basis of the technical scheme, the valve body is further provided with a control valve, the flow channel comprises a first flow channel, a second flow channel and a third flow channel, one ends of the first flow channel, the second flow channel and the third flow channel are connected with the control valve, the other end of the first flow channel is communicated with the front cavity, the other end of the second flow channel is communicated with the closed cavity, and the other end of the third flow channel is communicated with the rear cavity.
On the basis of the technical scheme, the control valve is a shuttle valve.
On the basis of the technical scheme, the front end of the valve seat is sequentially provided with the thrust ring, the spring and the spring seat, the thrust ring is sleeved on the inner hole of the valve body, two ends of the spring respectively support against the thrust ring and the spring seat, and the spring seat is fixed on the valve body.
On the basis of the technical scheme, the spring seat is provided with the mounting hole, and the spring is sleeved in the mounting hole.
On the basis of the technical scheme, the number of the mounting holes is multiple, and the mounting holes are annularly and uniformly distributed on the spring seat.
On the basis of the technical scheme, the joint of the spring seat and the valve body is provided with a threaded hole for connecting a fastener.
On the basis of the technical scheme, the rear end of the valve seat is provided with the annular groove, the sealing ring is installed in the annular groove, and the side, close to the valve ball, of the sealing ring is arc-shaped.
The invention further provides a ball valve, which comprises the single valve seat bidirectional sealing structure.
Compared with the prior art, the invention has the advantages that:
According to the single valve seat bidirectional sealing structure and the ball valve, the bidirectional sealing of the valve is realized through the single valve seat, the structure of the traditional double valve seat bidirectional sealing valve is simplified, the volume and the weight are reduced, and the manufacturing and maintenance cost is saved.
Drawings
FIG. 1 is a schematic structural diagram of a single valve seat bi-directional seal structure in an embodiment of the present invention;
FIG. 2 is a force diagram of a valve seat for P1> P2 in an embodiment of the present invention;
FIG. 3 is a graph showing the force diagram of the valve seat for P1< P2 in an embodiment of the present invention;
In the figure: 1. a valve ball; 2. a valve seat; 21. a first outer annulus; 22. a second outer annulus; 210. the front end of the valve seat; 220. the rear end of the valve seat; 3. a valve body; 31. a first flow passage; 32. a second flow passage; 33. a third flow passage; 34. a first bore surface; 35. a second inner bore surface; 4. a seal ring; 5. a thrust collar; 6. a spring; 7. a spring seat; 8. closing the cavity; 9. a control valve; 100. a front cavity; 200. a rear cavity.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
Referring to fig. 1, in one aspect, an embodiment of the present invention provides a single valve seat bidirectional sealing structure, including: a valve ball 1, a valve seat 2 and a valve body 3;
The valve seat 2 is in sliding sealing fit with the valve body 3, and a closed cavity 8 is formed at the sealing fit position; the valve seat 2 comprises a valve seat front end 210 far away from the valve ball 1 and a valve seat rear end 220 close to the valve ball 1, wherein a sealing ring 4 matched with the valve ball 1 is arranged on the valve seat rear end 220, and the sealing ring 4 divides the inner cavity of the valve body 3 into a front cavity 100 and a rear cavity 200. Specifically, the valve seat 2 is an annular stepped shaft structure provided with a first outer annular surface 21 and a second outer annular surface 22; the valve body 3 is provided with a first inner hole surface 34 and a second inner hole surface 35, the first outer ring surface 21 and the second outer ring surface 22 are in sliding sealing fit with the first inner hole surface 34 and the second inner hole surface 35, a sealing ring is arranged at the shaft hole fit position, and a closed cavity 8 is formed at the stepped shaft structure position.
The valve body 1 is provided with a flow passage configured to: when the medium pressure of the front cavity 100 is greater than or equal to the medium pressure of the rear cavity 200, the flow passage enables the front cavity 100 to be communicated with the closed cavity 8, so that the force of the medium acting on the front end 210 of the valve seat is greater than the force of the medium acting on the rear end 220 of the valve seat; when the pressure of the medium in the front chamber 100 is less than or equal to the pressure of the medium in the rear chamber 200, the flow passage communicates the rear chamber 200 with the closed chamber 8 so that the force of the medium against the valve seat front end 210 is greater than the valve seat rear end 220. Specifically, the valve body 3 is further provided with a control valve 9, the flow passage comprises a first flow passage, a second flow passage and a third flow passage, one ends of the first flow passage 31, the second flow passage 32 and the third flow passage 33 are all connected with the control valve, the other end of the first flow passage is communicated with the front cavity 100, the other end of the second flow passage is communicated with the closed cavity 8, and the other end of the third flow passage 33 is communicated with the rear cavity 200. Preferably, the control valve 9 is a shuttle valve, and when the medium pressure of the front cavity 100 is greater than or equal to the medium pressure of the rear cavity 200, the front cavity 100 is communicated with the closed cavity 8; when the medium pressure of the front chamber 100 is less than or equal to the medium pressure of the rear chamber 200, the rear chamber 200 is brought into communication with the closed chamber 8.
The working principle of the single valve seat bidirectional sealing structure of the embodiment of the invention is as follows:
referring to fig. 2, when the medium pressure P1 of the front chamber 100 is greater than the medium pressure P2 of the rear chamber 200, the control valve 9 conducts the first flow passage 31 and the second flow passage 32, and the pressure in the closed chamber 8 is equal to the pressure in the front chamber 100 and is P1. As can be seen from fig. 2: the upper portion of the last thick solid line, the pressure P1 at the valve seat front end 210 is greater than the pressure P2 at the valve seat rear end 220, i.e., P1> P2; the pressure P1 at the front end 210 of the valve seat and the pressure P1 at the rear end 220 of the valve seat are the sealing rings 4, and the pressure at the matched position of the sealing rings 4 and the valve ball 1 is ignored in calculation, namely P1>0; in the lower part of the next thick solid line, the pressure P1 at the valve seat front end 210 is equal to the pressure P1 at the valve seat rear end 220, i.e., p1=p1. In general, the force of the medium acting on the valve seat front end 210 is greater than the valve seat rear end 220, and the valve seat 2 is pressed against the valve ball 1 by the urging of the medium pressure, so that a reliable seal is formed.
Referring to fig. 3, when the medium pressure P1 of the front chamber 100 is smaller than the medium pressure P2 of the rear chamber 200, the control valve 9 connects the third flow passage 33 and the second flow passage 32, and the pressure in the closed chamber 8 is equal to the pressure in the rear chamber 200 and is P2. As can be seen from fig. 3: the upper part of the last thick solid line, the pressure P2 at the valve seat front end 210 is equal to the pressure P2 at the valve seat rear end 220, i.e., p2=p2; the pressure P2 at the front end 210 of the valve seat and the pressure P2 at the rear end 220 of the valve seat are the sealing rings 4, and the pressure at the matched position of the sealing rings 4 and the valve ball 1, namely P2>0, is ignored in calculation; the pressure P2 at the valve seat front end 210 is greater than the pressure P1 at the valve seat rear end 220, i.e., P2> P1, at the portion between the second thick solid line and the third thick solid line; in the lower part of the third thick solid line, the pressure P1 at the valve seat front end 210 is equal to the pressure P1 at the valve seat rear end 220, i.e., p1=p1. In general, the force of the medium acting on the valve seat front end 210 is greater than the valve seat rear end 220, and the valve seat 2 is pressed against the valve ball 1 by the urging of the medium pressure, so that a reliable seal is formed.
Referring to fig. 2 and 3, when the front chamber 100 medium pressure P1 is equal to the rear chamber 200 medium pressure P2, it can be generalized to either of the cases of P1> P2 or P1< P2 described above.
Compared with the prior art, the single valve seat bidirectional sealing structure realizes bidirectional sealing of the valve through the single valve seat, simplifies the structure of the traditional double valve seat bidirectional sealing valve, reduces the volume and the weight, and saves the manufacturing and maintenance cost.
As a preferred embodiment, the front end 210 of the valve seat is sequentially provided with a thrust ring 5, a spring 6 and a spring seat 7, the thrust ring 5 is sleeved on the inner hole of the valve body 3, two ends of the spring 6 respectively abut against the thrust ring 5 and the spring seat 7, and the spring seat 7 is fixed on the valve body 3. The joint of the spring seat 7 and the valve body 3 is provided with a threaded hole for connecting a fastener, and the spring seat 7 and the valve body 3 are fixed through a fastening screw. Specifically, the spring seat 7 is provided with a mounting hole, and the spring 6 is sleeved in the mounting hole. The installation holes are multiple, and the installation holes are annularly and uniformly distributed on the spring seat 7. By means of the thrust ring 5, the spring 6 and the spring seat 7, a spring pre-tightening force is provided from another angle to act on the front end 210 of the valve seat, so that the valve seat 2 is driven to be pressed on the valve ball 1, and a reliable seal is formed. The plurality of springs 6 are evenly distributed in a ring shape, and the force acting on the front end 210 of the valve seat is more balanced.
As the preferred embodiment, the valve seat rear end 220 is provided with an annular groove, the sealing ring 4 is arranged in the annular groove, the sealing ring 4 is in an arc shape close to the valve ball 1 side, the arc structure is more matched with the appearance of the valve ball 1, and the sealing effect is better.
The embodiment of the invention also provides a ball valve, which comprises the single valve seat bidirectional sealing structure.
Compared with the prior art, the ball valve provided by the embodiment of the invention has the advantages that the bidirectional sealing of the ball valve is realized through the single-valve-seat bidirectional sealing structure, the structure of the traditional double-valve-seat bidirectional sealing ball valve is simplified, the volume and the weight are reduced, and the manufacturing and maintenance cost is saved.
The invention is not limited to the embodiments described above, but a number of modifications and adaptations can be made by a person skilled in the art without departing from the principle of the invention, which modifications and adaptations are also considered to be within the scope of the invention. What is not described in detail in this specification is prior art known to those skilled in the art.
Claims (8)
1. A single valve seat bi-directional seal structure, comprising: a valve ball (1), a valve seat (2) and a valve body (3);
The valve seat (2) is in sliding sealing fit with the valve body (3), and a closed cavity (8) is formed at the sealing fit position; the valve seat (2) comprises a valve seat front end (210) far away from the valve ball (1) and a valve seat rear end (220) close to the valve ball (1), a sealing ring (4) matched with the valve ball (1) is arranged on the valve seat rear end (220), and the sealing ring (4) divides an inner cavity of the valve body (3) into a front cavity (100) and a rear cavity (200);
The valve body (3) is provided with a flow passage configured to: when the medium pressure of the front cavity (100) is greater than or equal to that of the rear cavity (200), the flow passage enables the front cavity (100) to be communicated with the closed cavity (8) so that the force of the medium acting on the front end (210) of the valve seat is greater than that of the rear end (220) of the valve seat; when the medium pressure of the front cavity (100) is smaller than or equal to the medium pressure of the rear cavity (200), the flow passage enables the rear cavity (200) to be communicated with the closed cavity (8), so that the force of the medium acting on the front end (210) of the valve seat is larger than that of the rear end (220) of the valve seat;
The valve seat (2) is of an annular stepped shaft structure and is provided with a first outer annular surface (21) and a second outer annular surface (22); the valve body (3) is provided with a first inner hole surface (34) and a second inner hole surface (35), the first outer ring surface (21) and the second outer ring surface (22) are in sliding sealing fit with the first inner hole surface (34) and the second inner hole surface (35), and the closed cavity (8) is formed at the stepped shaft structure;
The valve body (3) is further provided with a control valve (9), the flow channel comprises a first flow channel (31), a second flow channel (32) and a third flow channel (33), one ends of the first flow channel (31), the second flow channel (32) and the third flow channel (33) are connected with the control valve (9), the other end of the first flow channel (31) is communicated with the front cavity (100), the other end of the second flow channel (32) is communicated with the closed cavity (8), and the other end of the third flow channel (33) is communicated with the rear cavity (200).
2. The single valve seat bi-directional seal structure of claim 1, wherein: the control valve (9) is a shuttle valve.
3. The single valve seat bi-directional seal structure of claim 1, wherein:
The novel valve is characterized in that a thrust ring (5), a spring (6) and a spring seat (7) are sequentially arranged at the front end (210) of the valve seat, the thrust ring (5) is sleeved on an inner hole of the valve body (3), two ends of the spring (6) are respectively propped against the thrust ring (5) and the spring seat (7), and the spring seat (7) is fixed on the valve body (3).
4. The single valve seat bi-directional seal structure of claim 3 wherein:
The spring seat (7) is provided with a mounting hole, and the spring (6) is sleeved in the mounting hole.
5. The single valve seat bi-directional seal structure of claim 4 wherein:
The installation holes are multiple and are annularly and uniformly distributed on the spring seat (7).
6. The single valve seat bi-directional seal structure of claim 3 wherein:
The joint of the spring seat (7) and the valve body (3) is provided with a threaded hole for connecting a fastener.
7. The single valve seat bi-directional seal structure of claim 1, wherein:
The valve seat rear end (220) is provided with an annular groove, the sealing ring (4) is installed in the annular groove, and the side, close to the valve ball (1), of the sealing ring (4) is arc-shaped.
8. A ball valve comprising the single valve seat bi-directional seal structure of any one of claims 1-7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911205383.5A CN110778741B (en) | 2019-11-29 | 2019-11-29 | Single-valve-seat bidirectional sealing structure and ball valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911205383.5A CN110778741B (en) | 2019-11-29 | 2019-11-29 | Single-valve-seat bidirectional sealing structure and ball valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110778741A CN110778741A (en) | 2020-02-11 |
| CN110778741B true CN110778741B (en) | 2024-05-28 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911205383.5A Active CN110778741B (en) | 2019-11-29 | 2019-11-29 | Single-valve-seat bidirectional sealing structure and ball valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110778741B (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08128544A (en) * | 1994-10-31 | 1996-05-21 | Osaka Gas Co Ltd | Ball valve |
| CN105736729A (en) * | 2016-04-28 | 2016-07-06 | 超达阀门集团股份有限公司 | Anti-blocking and scouring-resistant bidirectional seal adjusting valve |
| CN205689791U (en) * | 2016-04-28 | 2016-11-16 | 超达阀门集团股份有限公司 | A kind of anti-blocking resistance to erosion two way seal regulation valve |
| CN206268498U (en) * | 2016-11-11 | 2017-06-20 | 江苏神通阀门股份有限公司 | A kind of valve seat construction of bidirectional metal hard-sealing floating ball valve |
| CN107559449A (en) * | 2017-10-20 | 2018-01-09 | 上海阀门厂股份有限公司 | A kind of multi-state valve sealing structure |
| CN211344094U (en) * | 2019-11-29 | 2020-08-25 | 中国船舶重工集团公司第七一九研究所 | Single-valve-seat bidirectional sealing structure and ball valve |
-
2019
- 2019-11-29 CN CN201911205383.5A patent/CN110778741B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08128544A (en) * | 1994-10-31 | 1996-05-21 | Osaka Gas Co Ltd | Ball valve |
| CN105736729A (en) * | 2016-04-28 | 2016-07-06 | 超达阀门集团股份有限公司 | Anti-blocking and scouring-resistant bidirectional seal adjusting valve |
| CN205689791U (en) * | 2016-04-28 | 2016-11-16 | 超达阀门集团股份有限公司 | A kind of anti-blocking resistance to erosion two way seal regulation valve |
| CN206268498U (en) * | 2016-11-11 | 2017-06-20 | 江苏神通阀门股份有限公司 | A kind of valve seat construction of bidirectional metal hard-sealing floating ball valve |
| CN107559449A (en) * | 2017-10-20 | 2018-01-09 | 上海阀门厂股份有限公司 | A kind of multi-state valve sealing structure |
| CN211344094U (en) * | 2019-11-29 | 2020-08-25 | 中国船舶重工集团公司第七一九研究所 | Single-valve-seat bidirectional sealing structure and ball valve |
Non-Patent Citations (1)
| Title |
|---|
| 双向密封偏心半球球阀浮动阀座的设计与分析;张建斌;杨玲玲;吴磊;冯玉林;李蓉;;阀门;20170225(第01期);全文 * |
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| CN110778741A (en) | 2020-02-11 |
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