CN105587885B - Sealing ball valve - Google Patents
Sealing ball valve Download PDFInfo
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- CN105587885B CN105587885B CN201610140008.7A CN201610140008A CN105587885B CN 105587885 B CN105587885 B CN 105587885B CN 201610140008 A CN201610140008 A CN 201610140008A CN 105587885 B CN105587885 B CN 105587885B
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- valve rod
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Classifications
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- 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
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- 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
- F16K5/0605—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 with particular plug arrangements, e.g. particular shape or built-in means
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- 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
- F16K5/0647—Spindles or actuating means
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Taps Or Cocks (AREA)
- Details Of Valves (AREA)
Abstract
The invention discloses a pipeline control valve, in particular to a sealing ball valve, which comprises a valve body, a valve rod, a ball body, an inlet valve seat and an outlet valve seat, wherein the inlet spherical surface of the ball body is provided with a through hole which is communicated with a flow passage of the ball body; the top of the sphere is subjected to weight reduction treatment to form a platform, a boss is arranged on the platform, a key groove is arranged in the boss, and the key groove is connected with a connecting key at the bottom of the valve rod; the bottom of the sphere is subjected to weight reduction treatment to form a platform. In a word, the sealing ball valve provided by the invention has the characteristics of light weight, small operation moment, stable switch and the like, prolongs the service life of the ball valve, and ensures the safety and reliability of the ball valve.
Description
Technical Field
The invention relates to a pipeline control valve, in particular to a sealing ball valve.
Background
The ball valve has the characteristics of small flow resistance, rapid opening and closing, good sealing performance, long service life, convenient air control and electric control and the like, is widely applied to industries such as petroleum refining, long-distance pipeline, chemical industry, papermaking, pharmacy and the like, and plays a significant role in national economy. With the rising of industries such as coal chemical industry in recent years, the ball valve has the characteristics of good sealing performance and long service life under the working conditions of high temperature, high pressure and high wear resistance, and the application field is wider.
The ball valve is sealed by forming enough specific pressure of sealing by the pretightening force set between the valve seat and the ball body and the acting force generated by the medium pressure on the sealing surface of the valve seat. In the switching process of the ball valve, the pretightening force and the medium pressure between the valve seat and the ball body are always acted on the sealing surfaces of the valve seat and the ball body, so that the switching moment of the ball valve is larger than that of other types of valves. In summary, the valve seat and the ball sealing surface remain in contact throughout the opening or closing process of the ball valve. Because the contact area of the valve seat and the sealing surface of the ball body is large, the friction moment to be overcome is large, so that an actuating mechanism with large output moment is required to be selected, and the external dimension of the valve is increased; meanwhile, due to abrasion between the valve seat and the sealing surface of the ball body, the risk of leakage of the sealing surface is increased, and the service life of the ball valve is influenced.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a sealing ball valve, which adopts a ball structure design that an inlet spherical surface is provided with a through hole and is subjected to weight reduction treatment, so that the flow path of a medium is increased, the fluid resistance of the ball valve during opening and closing is reduced, the flowing form of the medium is improved, vibration and noise generated during pressure change are reduced, the ball valve opening and closing action is more stable, the weight of the ball is reduced, and the self weight of the valve is also reduced.
The invention also aims to provide a sealing ball valve, wherein the shaft sleeve of the valve rod adopts a shaft sleeve design with a self-lubricating function, has small friction coefficient and good wear resistance, reduces the operating torque when the ball valve is opened and closed, ensures that the opening and closing actions are stable, avoids the phenomenon of shaft biting at the valve rod, has the characteristics of light weight and long service life, can form a transfer film in the opening and closing process of the ball valve, reduces vibration at the valve rod, reduces noise and plays a role in protecting the valve rod.
The third purpose of the invention is to provide a sealing ball valve, wherein the inlet valve seat and the outlet valve seat are made of different materials, the inlet valve seat is made of polytetrafluoroethylene material, and the outlet valve seat is made of reinforced polytetrafluoroethylene material, so that the sealing performance of the valve can be ensured under the high temperature condition.
To achieve the purpose, the invention provides the following technical scheme:
The invention provides a sealing ball valve, which comprises: the valve comprises a valve body, a valve rod, a ball body, an inlet valve seat and an outlet valve seat, wherein a through hole is formed in the inlet spherical surface of the ball body, and the through hole is communicated with a flow passage of the ball body; the top of the sphere is subjected to weight reduction treatment to form a platform, a boss is arranged on the platform, a key groove is arranged in the boss, and the key groove is connected with a connecting key at the bottom of the valve rod; the bottom of the sphere is subjected to weight reduction treatment to form a platform. The spherical structure design that the through holes are formed in the inlet spherical surface is adopted, when the ball valve is in a fully closed state, the outlet spherical surface and the outlet valve seat form spherical surface sealing, and the through holes on the inlet spherical surface cannot influence sealing performance; in the ball valve switch process, the medium can pass through the through hole on the inlet spherical surface, so that the flow path of the medium is increased, the fluid resistance during the ball valve switch is reduced, the flow form of the medium is improved, the vibration and noise generated during the pressure change are reduced, and the ball valve switch is enabled to act more stably. The weight of the ball body is reduced by weight reduction treatment, and the self weight of the valve is also reduced.
In a specific technical scheme, the reinforcing ribs are arranged on the bottom platform of the sphere to ensure the strength and rigidity of the sphere after weight reduction treatment.
In another specific technical scheme, the top surface of the sphere is provided with one or more communication holes, and the communication holes communicate the flow passage of the sphere with the inner cavity of the valve body in the valve body. The pressure balance between the ball flow passage and the inner cavity of the valve body can be maintained by the design of the communication hole.
In another specific technical scheme, the communication hole is a through hole.
In another specific technical scheme, the valve rod sleeve further comprises a valve rod shaft sleeve, wherein the valve rod shaft sleeve is positioned in a valve rod hole of the valve body and sleeved on the valve rod. The valve rod shaft sleeve adopts a shaft sleeve design with a self-lubricating function, has small friction coefficient and good wear resistance, reduces the operation torque when the ball valve is opened and closed, ensures that the opening and closing actions are stable, and can avoid the phenomenon of shaft biting at the valve rod.
In another specific technical scheme, one or more shaft sleeve through holes are formed in the valve rod shaft sleeve, and the inner circular surface and the outer circular surface of the valve rod shaft sleeve are communicated through the shaft sleeve through holes. The valve rod shaft sleeve designed in this way has the characteristics of light weight and long service life, and can form a transfer film in the ball valve opening and closing process, so that vibration at the valve rod is reduced, noise is reduced, and the valve rod is protected.
In another specific technical scheme, the shaft sleeve through holes are uniformly distributed.
In another specific technical scheme, the shaft sleeve through hole is a through hole.
In another specific technical scheme, the material of the inlet valve seat is polytetrafluoroethylene.
In another specific technical scheme, the material of the outlet valve seat is reinforced polytetrafluoroethylene. The inlet valve seat and the outlet valve seat are made of different materials, so that the sealing performance of the valve can be ensured under the high temperature condition.
The beneficial effects of the invention are as follows:
The sealing ball valve provided by the invention adopts the ball body structural design that the inlet spherical surface is provided with the through hole, and adopts the valve rod shaft sleeve design with the self-lubricating function and adopts different materials for the inlet valve seat and the outlet valve seat through weight reduction treatment, so that the sealing ball valve has the following advantages:
The hydraulic resistance of the ball valve is reduced, the flowing form of the medium is improved, and the vibration and noise generated during pressure change are reduced, so that the ball valve is enabled to act more stably, the weight of the ball body is reduced, the self weight of the valve is also reduced, the service life of the ball valve is prolonged, and the safety and reliability of the ball valve are ensured.
The friction coefficient at the valve rod is small, the wear resistance is good, the operation torque when the ball valve is opened and closed is reduced, the opening and closing actions are stable, and the phenomenon that the valve rod is bitten is avoided.
And under the high-temperature working condition, the ball body and the valve seat are reliably sealed, so that the danger of internal leakage of the ball valve is avoided.
Meanwhile, the invention has the characteristics of simple structure, easy processing, easy assembly, energy conservation, environmental protection and the like, and can be widely applied to the working conditions of high temperature and high pressure difference.
Drawings
FIG. 1 is a schematic diagram of a fully open state of a sealing ball valve according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a sealed ball valve in a fully closed state according to an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a ball and valve seat of a sealing ball valve according to an embodiment of the present invention;
fig. 4 is a schematic structural view of a valve stem sleeve of a sealing ball valve according to an embodiment of the present invention.
In the figure:
1. a valve body; 2. an end cap; 3. a valve stem; 4. a sphere; 5. an inlet valve seat; 6. an outlet valve seat; 7. a shaft sleeve; 4-1, through holes; 4-2, a communication hole; 4-3, reinforcing ribs; 7-1, a shaft sleeve through hole.
Detailed Description
The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention and the accompanying drawings, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
An embodiment of the present invention provides a sealing ball valve, as shown in fig. 1, including: the whole valve body structure consisting of the valve body 1 and the end cover 2 comprises a valve rod 3, a ball 4, an inlet valve seat 5, an outlet valve seat 6 and a valve rod shaft sleeve 7, wherein the inlet valve seat 5 and the outlet valve seat 6 are arranged in a cavity of the valve body, the ball 4 is arranged between the inlet valve seat 5 and the outlet valve seat 6 and is floating, and the valve rod 3 is arranged in a valve rod hole of the valve body to drive the ball 4 to finish the switching action. As shown in fig. 3, the inlet spherical surface of the ball body 4 is provided with a through hole 4-1, and the through hole 4-1 is communicated with the flow channel of the ball body 4, so that the flow path of a medium is increased, the fluid resistance during switching of the ball valve is reduced, the flow form of the medium is improved, vibration and noise generated during pressure change are reduced, and the switching action of the ball valve is more stable; the ball 4 is subjected to weight reduction treatment to reduce the weight of the ball, so that the self weight of the valve is reduced, a platform is formed at the top and the bottom of the ball 4 after weight reduction treatment, a boss is arranged on the top platform, a key slot is arranged in the boss, the key slot is connected with a connecting key at the bottom of the valve rod 3, and the valve rod 3 drives the ball 4 to rotate through the connecting key; the reinforcing ribs 4-3 are arranged on the platform at the bottom of the sphere 4 so as to ensure the strength and rigidity of the sphere 4 after weight reduction treatment; the top surface of the sphere 4 is provided with a communication hole 4-2, the communication hole 4-2 communicates the flow passage of the sphere 4 with the inner cavity of the valve body in the valve body 1, so that the pressure balance between the flow passage of the sphere and the inner cavity of the valve body can be maintained, and the communication hole 4-2 is a straight through hole.
The following describes in detail the operation state of the ball valve and the flow process of medium when the ball valve is fully opened and fully closed in combination with the sealing ball valve in embodiment 1 of the present invention.
As shown in fig. 1, when the ball valve is in a fully opened state, the ball 4 contacts with the inlet valve seat 5 and the outlet valve seat 6 respectively to form sealing surfaces, and fluid medium sequentially passes through the end cover 2, the inlet valve seat 5, the ball 4, the outlet valve seat 6 and the flow passage in the valve body 1, so that normal circulation can be realized, and the sealing surfaces of the inlet valve seat 5 and the outlet valve seat 6 can be protected. And, medium can flow into or out of the valve body cavity in the valve body 1 through the through hole 4-1 and the communication hole 4-2 so as to keep the pressure balance between the ball flow passage and the valve body cavity.
After the ball 4 is driven by the valve rod 3 to finish the closing action, as shown in fig. 2, the ball valve is in a fully closed state, fluid medium sequentially flows through the inner flow channel of the end cover 2 and the flow channel of the inlet valve seat 5, enters the flow channel of the ball 4 through the through hole 4-1 of the ball 4, and under the action of medium pressure, the ball 4 generates certain displacement and is tightly pressed on the outlet valve seat 6 to form spherical seal. And, medium can flow into or out of the valve body cavity in the valve body 1 through the flow passage of the ball body 4 and the communication hole 4-2 so as to keep the pressure balance of the ball flow passage and the valve body cavity.
Example 2
An embodiment of the present invention provides a sealing ball valve, as shown in fig. 1, including: the whole valve body structure consisting of the valve body 1 and the end cover 2 comprises a valve rod 3, a ball 4, an inlet valve seat 5 and an outlet valve seat 6, wherein the inlet valve seat 5 and the outlet valve seat 6 are arranged in a cavity of the valve body, the ball 4 is arranged between the inlet valve seat 5 and the outlet valve seat 6 and is floating, and the valve rod 3 is arranged in a valve rod hole of the valve body to drive the ball 4 to finish the switching action. As shown in fig. 3, the inlet spherical surface of the ball body 4 is provided with a through hole 4-1, and the through hole 4-1 is communicated with the flow channel of the ball body 4, so that the flow path of a medium is increased, the fluid resistance during switching of the ball valve is reduced, the flow form of the medium is improved, vibration and noise generated during pressure change are reduced, and the switching action of the ball valve is more stable; the ball 4 is subjected to weight reduction treatment to reduce the weight of the ball, so that the self weight of the valve is reduced, a platform is formed at the top and the bottom of the ball 4 after weight reduction treatment, a boss is arranged on the top platform, a key slot is arranged in the boss, the key slot is connected with a connecting key at the bottom of the valve rod 3, and the valve rod 3 drives the ball 4 to rotate through the connecting key; the reinforcing ribs 4-3 are arranged on the platform at the bottom of the sphere 4 so as to ensure the strength and rigidity of the sphere 4 after weight reduction treatment; the top surface of the sphere 4 is provided with a communication hole 4-2, the communication hole 4-2 communicates the flow passage of the sphere 4 with the inner cavity of the valve body in the valve body 1, so that the pressure balance between the flow passage of the sphere and the inner cavity of the valve body can be maintained, and the communication hole 4-2 is a straight through hole. The inlet valve seat 5 and the outlet valve seat 6 are made of different materials, the inlet valve seat 5 is made of polytetrafluoroethylene materials, the outlet valve seat 6 is made of reinforced polytetrafluoroethylene materials, and the sealing of the ball valve is finished by the spherical sealing formed by the ball 4 and the outlet valve seat 6, so that the outlet valve seat 6 has high temperature resistance, and the sealing performance of the ball valve can be ensured at high temperature. While the through-hole 4-1 at the inlet surface of the ball 4 does not affect the sealing performance of the ball valve.
As shown in fig. 4, the valve rod shaft sleeve 7 is located in a valve rod hole of the valve body 1 and sleeved on the valve rod 3, and adopts a self-lubricating design, and a plurality of shaft sleeve through holes 7-1 are formed in the valve rod shaft sleeve 7 to communicate an inner circular surface with an outer circular surface of the valve rod shaft sleeve 7, and the shaft sleeve through holes 7-1 are through holes and are uniformly distributed. The valve rod shaft sleeve 7 with the self-lubricating function has the advantages of small friction coefficient and good wear resistance, reduces the operation torque when the ball valve is opened and closed, ensures that the opening and closing actions are stable, and can avoid the phenomenon of shaft biting at the valve rod 3. Meanwhile, the valve rod shaft sleeve 7 has the characteristics of light weight and long service life, a transfer film can be formed in the ball valve opening and closing process, vibration of the valve rod 3 is reduced, noise is reduced, and the valve rod 3 is protected.
The following describes in detail the operation state of the ball valve and the flow process of medium when the ball valve is fully opened and fully closed in combination with the sealing ball valve in embodiment 1 of the present invention.
As shown in fig. 1, when the ball valve is in a fully opened state, the ball 4 contacts with the inlet valve seat 5 and the outlet valve seat 6 respectively to form sealing surfaces, and fluid medium sequentially passes through the end cover 2, the inlet valve seat 5, the ball 4, the outlet valve seat 6 and the flow passage in the valve body 1, so that normal circulation can be realized, and the sealing surfaces of the inlet valve seat 5 and the outlet valve seat 6 can be protected. And, medium can flow into or out of the valve body cavity in the valve body 1 through the through hole 4-1 and the communication hole 4-2 so as to keep the pressure balance between the ball flow passage and the valve body cavity. Meanwhile, the medium can flow through the shaft sleeve through hole 7-1 on the valve rod shaft sleeve 7 to play a role of self lubrication.
After the ball 4 is driven by the valve rod 3 to finish the closing action, as shown in fig. 2, the ball valve is in a fully closed state, fluid medium sequentially flows through the inner flow channel of the end cover 2 and the flow channel of the inlet valve seat 5, enters the flow channel of the ball 4 through the through hole 4-1 of the ball 4, and under the action of medium pressure, the ball 4 generates certain displacement and is tightly pressed on the outlet valve seat 6 to form spherical seal. And, medium can flow into or out of the valve body cavity in the valve body 1 through the flow passage of the ball body 4 and the communication hole 4-2 so as to keep the pressure balance of the ball flow passage and the valve body cavity. Meanwhile, the medium can flow through the shaft sleeve through hole 7-1 on the valve rod shaft sleeve 7, and a transfer film can be formed on the inner surface and the outer surface of the valve rod shaft sleeve 7 in the switching process of the ball valve, so that vibration of the valve rod 3 is reduced, noise is reduced, and the valve rod 3 is protected.
In addition, in the description of the present invention, it should be understood that the directions or positional relationships indicated by the terms "front", "rear", "upper", "lower", "top", "bottom", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.
The above embodiments are merely two specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art can easily think about changes or substitutions within the technical scope of the present invention, and the changes and substitutions are intended to be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (4)
1. The utility model provides a sealed ball valve, includes valve body (1), valve rod (3), spheroid (4), import disk seat (5), export disk seat (6), its characterized in that:
The inlet spherical surface of the sphere (4) is provided with a through hole (4-1), and the through hole (4-1) is communicated with the flow channel of the sphere (4);
the top of the ball body (4) is subjected to weight reduction treatment to form a platform, a boss is arranged on the platform, a key groove is arranged in the boss, and the key groove is connected with a connecting key at the bottom of the valve rod (3);
the bottom of the sphere (4) is subjected to weight reduction treatment to form a platform;
The valve rod sleeve (7) is positioned in a valve rod hole of the valve body (1) and sleeved on the valve rod (3); one or more shaft sleeve through holes (7-1) are formed in the valve rod shaft sleeve (7), and the shaft sleeve through holes (7-1) are used for communicating the inner circular surface and the outer circular surface of the valve rod shaft sleeve (7); the shaft sleeve through holes (7-1) are uniformly distributed; the shaft sleeve through hole (7-1) is a through hole;
the inlet valve seat (5) is made of polytetrafluoroethylene;
the material of the outlet valve seat (6) is reinforced polytetrafluoroethylene;
The ball (4) is located between the inlet valve seat (5) and the outlet valve seat (6) and is floating;
the fluid medium can flow through the shaft sleeve through hole (7-1) on the valve rod shaft sleeve (7) to play a role of self lubrication.
2. The sealed ball valve of claim 1, wherein:
The bottom platform of the sphere (4) is provided with a reinforcing rib (4-3).
3. The sealed ball valve of claim 1, wherein:
The top surface of the sphere (4) is provided with one or more communication holes (4-2), and the communication holes (4-2) are used for communicating a flow passage of the sphere (4) with a valve body inner cavity in the valve body (1).
4. A sealing ball valve as defined in claim 3, wherein:
the communication hole (4-2) is a through hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610140008.7A CN105587885B (en) | 2016-03-11 | 2016-03-11 | Sealing ball valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610140008.7A CN105587885B (en) | 2016-03-11 | 2016-03-11 | Sealing ball valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105587885A CN105587885A (en) | 2016-05-18 |
| CN105587885B true CN105587885B (en) | 2024-05-28 |
Family
ID=55927685
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610140008.7A Active CN105587885B (en) | 2016-03-11 | 2016-03-11 | Sealing ball valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105587885B (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105972241B (en) * | 2016-07-14 | 2018-05-11 | 昆山维萨阀门有限公司 | A kind of semi-contact seal ball-valve |
| CN107740869A (en) * | 2017-11-24 | 2018-02-27 | 航天长征化学工程股份有限公司 | Noise reduction ball valve |
| CN107917229B (en) * | 2017-12-01 | 2024-03-26 | 航天长征化学工程股份有限公司 | Mute ball valve |
| CN114811088A (en) * | 2022-03-23 | 2022-07-29 | 安徽球科流体制造有限公司 | Ball valve body and processing technology thereof |
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