CN110953371A - One-way sealing ball valve - Google Patents
One-way sealing ball valve Download PDFInfo
- Publication number
- CN110953371A CN110953371A CN201911380214.5A CN201911380214A CN110953371A CN 110953371 A CN110953371 A CN 110953371A CN 201911380214 A CN201911380214 A CN 201911380214A CN 110953371 A CN110953371 A CN 110953371A
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- Prior art keywords
- spherical
- sealing
- sealing ring
- valve
- ball valve
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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
- F16K5/0657—Particular coverings or materials
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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
- F16K5/08—Details
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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
- F16K5/08—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
- F16K5/201—Special arrangements for separating the sealing faces or for pressing them together for plugs with spherical surfaces with the housing or parts of the housing mechanically pressing the seal against the plug
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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
- F16K5/08—Details
- F16K5/22—Features relating to lubrication
- F16K5/227—Features relating to lubrication for plugs with spherical surfaces
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Taps Or Cocks (AREA)
Abstract
The embodiment of the invention discloses a one-way sealing ball valve, wherein a spherical part of a spherical valve is provided with a through hole and spherical sealing surfaces positioned at two sides of the through hole, and one end of a sealing ring, which is in contact with the spherical valve, is of a spherical structure; the sealing ring is formed by fluoroplastic materials and is used for forming a sealing pair with the spherical valve; the other end of the sealing ring is provided with a boss, the pipe joint comprises a joint end and a supporting end, one end of the spring abuts against one end, provided with the boss, of the sealing ring, the supporting end of the pipe joint is attached to the boss of the sealing ring, the sleeve of the supporting end is nested outside the spring, the other end of the spring abuts against the inner wall of the sleeve of the supporting end, and the shell is nested outside one side of the supporting end of the spherical valve, the sealing ring and the pipe joint. The embodiment of the invention realizes the effect of reducing the product cost by replacing a bidirectional sealing structure with a one-way sealing structure on the premise of not reducing the functional performance and reliability of the ball valve, and simultaneously solves the problem of rubber cutting of the traditional ball valve.
Description
Technical Field
The application relates to but not limited to aviation fuel ball valve technical field indicates a one-way sealing ball valve especially.
Background
The traditional ball valve forms a sealing pair with a spherical valve through a rubber sealing ring, and the sealing ring is easy to cut rubber in the rotating process of the spherical valve because an aircraft fuel system (contacted with fuel) can not be coated with lubricating grease; the rubber cutting phenomenon causes the reduction of the self-sealing performance of the ball valve on one hand, and on the other hand, redundant materials are formed, and the ball valve becomes an uncontrollable pollution source, so that uncertain risks are brought to an aircraft fuel system.
Because there is the rubber phenomenon in traditional ball valve, and lead to the lower problem of sealing reliability, adopt two-way sealed structure form at present usually, and then reduce product cost and alleviate product weight.
Disclosure of Invention
In order to solve the technical problem, embodiments of the present invention provide a one-way sealing ball valve, so as to replace a two-way sealing structure with a one-way sealing structure on the premise of not reducing the functional performance and reliability of the ball valve, and solve the problem of rubber cutting of the conventional ball valve.
The embodiment of the invention provides a one-way sealing ball valve, which comprises: the ball valve, the sealing ring, the spring, the pipe joint and the shell;
the spherical part of the spherical valve is provided with a through hole and spherical sealing surfaces positioned at two sides of the through hole, and one end of the sealing ring, which is in contact with the spherical valve, is of a spherical structure; the sealing ring is formed by fluoroplastic materials and is used for forming a sealing pair with the spherical valve through the contact of a spherical structure at one end of the sealing ring and a spherical sealing surface in the spherical valve;
the other end of sealing ring is provided with the boss, the coupling includes joint end and support end, the one end of spring supports and leans on the sealing ring has the one end of boss, the support end of coupling with the boss laminating setting of sealing ring, just the sleeve of support end nestification is in the outside of spring and makes the other end of spring supports and leans on support the sleeve inner wall of end, the casing nestification is in spherical valve the sealing ring with the outside of support end one side of coupling.
Optionally, in the ball valve with one-way sealing as described above, the sealing ring contacts the ball valve in a linear contact manner with spherical surfaces of unequal radii.
Optionally, in the ball check valve as described above, the spherical radius of the spherical structure in the sealing ring is larger than the spherical radius of the sealing surface in the ball valve.
Optionally, in the one-way sealing ball valve as described above, the fluoroplastic material forms a sealing ring having a shear strength greater than that of the rubber material.
Optionally, in the one-way sealing ball valve as described above, the fluoroplastic material forms a sealing ring having a specific sealing pressure smaller than that of the metal material.
Optionally, in the one-way sealing ball valve as described above, the ball valve has a central axis;
the spherical valve is used for enabling the through hole of the spherical valve to be opposite to the spherical structure at one end of the sealing ring through axial rotation along the central shaft, so that the one-way sealing ball valve is in a conducting state, a medium flowing channel is formed, and a medium flows out through the pipe joint.
Alternatively, in a one-way sealed ball valve as described above,
the spherical valve is also used for enabling the spherical sealing surface of the spherical valve to be attached to the spherical structure of the sealing ring through axial rotation along the central shaft, so that the one-way sealing ball valve is in a closed state, and the spherical structure of the sealing ring and the spherical sealing surface of the spherical valve form a sealing pair under the action of the pretightening force of the spring.
Optionally, in the one-way sealing ball valve as described above, further comprising: the sealing ring is arranged between the sealing ring and the shell and used for external sealing;
and a sealing ring arranged between the pipe joint support end and the shell and used for external sealing.
The one-way sealing ball valve provided by the embodiment of the invention adopts a sealing ring processed by fluoroplastic materials to form a sealing pair with a spherical valve, the ball valve is the one-way sealing ball valve which realizes sealing under the action of system pressure and the pretightening force of a spring, and the ball valve is provided with a shell, wherein the spherical valve, the sealing ring, a pipe joint and the spring are arranged in the shell; the sealing surface of the spherical valve is a spherical surface, the sealing ring is made of fluoroplastic, the sealing ring is in contact with the spherical valve in a linear contact mode through spherical surfaces with unequal radii, the spherical surfaces with unequal radii are in contact and have self-alignment capability, the spherical radius of the sealing ring is larger than that of the spherical valve, and the spherical valve and the sealing ring form a sealing structure under the action of the pretightening force of a spring and the system pressure. The one-way sealing ball valve provided by the embodiment of the invention is convenient to assemble and high in reliability; the rubber cutting phenomenon of the fuel system ball valve can be solved, in addition, the product cost can be reduced, the product weight can be reduced, and great significance is provided for realizing reliability increase, pollution source control, cost reduction, weight reduction and the like of an aircraft fuel system.
Drawings
The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the example serve to explain the principles of the invention and not to limit the invention.
Fig. 1 is a schematic structural diagram of a one-way sealing ball valve according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that the embodiments and features of the embodiments in the present application may be arbitrarily combined with each other without conflict.
The following specific embodiments of the present invention may be combined, and the same or similar concepts or processes may not be described in detail in some embodiments.
Fig. 1 is a schematic structural diagram of a one-way sealing ball valve according to an embodiment of the present invention. The one-way sealing ball valve provided by the embodiment can comprise: the ball valve 2, the sealing ring 6, the spring 4, the pipe joint 5 and the shell 1. Fig. 1 is a sectional view of a one-way sealed ball valve, and each internal structure of the one-way sealed ball valve illustrated in fig. 1 is a revolving body.
In the structure of the one-way sealing ball valve shown in fig. 1, the spherical portion of the spherical shutter 2 has a through hole 21 and spherical sealing surfaces on both sides of the through hole, and the sectional view shown in fig. 1 illustrates the through hole 21 of the spherical shutter 1, and the spherical sealing surfaces thereof are not at the position of the sectional view shown in fig. 1; one end of the sealing ring 6, which is contacted with the spherical valve 2 in the embodiment of the invention, is of a spherical structure; the sealing ring 6 is a sealing ring 6 formed by fluoroplastic materials and is used for forming a sealing pair with the spherical valve 2 through the contact of a spherical surface structure at one end of the sealing ring and a spherical sealing surface in the spherical valve 2; the sealing pair formed by the spherical structures of the spherical valve 2 and the sealing ring 6 on one side is a one-way sealing structure, namely the ball valve in the embodiment of the invention is a ball valve with a one-way sealing structure.
In the embodiment of the invention, a boss is arranged at the other end of the sealing ring 2, the pipe joint 5 comprises a joint end 51 and a support end 52, one end of the spring 4 abuts against one end, provided with the boss, of the sealing ring 2, the support end 52 of the pipe joint 5 is attached to the boss of the sealing ring 6, the sleeve of the support end 52 is nested on the outer side of the spring 4, the other end of the spring 4 abuts against the inner wall of the sleeve of the support end 52, and the shell 1 is nested on the outer side of one side of the spherical valve 2, the sealing ring 6 and the.
The shell 1 in the embodiment of the invention is used for supporting the spherical valve 2, the sealing ring 6 and the pipe joint 5, so that the internal structure of the one-way sealing ball valve forms a unified whole, and the spherical valve 2 and the sealing ring 6 form a sealing pair; the spring 4 is positioned between the sealing ring 6 and the pipe joint 5 and is used for providing pretightening force for a sealing pair formed by the sealing ring 6 and the spherical valve 2; and a support end 52 of the pipe joint 5 for providing support for the spring 4.
It should be noted that, in the conventional bidirectional sealing ball valve structure, a bolt and nut combination mode is usually adopted to compress the bidirectional sealing structure, so that the bidirectional sealing structure can tightly wrap the ball valve, and if the sealing structure is worn or deformed, the sealing performance of the bidirectional sealing structure ball valve will be deteriorated. According to the embodiment of the invention, the spring is adopted to provide pre-tightening force for the sealing pair formed by the sealing ring 6 and the spherical valve 2, so that the pressure between the sealing ring 6 and the spherical valve 2 is smaller, and the corresponding abrasion is smaller; in addition, even if the sealing ring 6 has abrasion, the compensation of force can be provided by the spring 4, and the sealing performance of the one-way sealing ball valve is ensured.
As shown in fig. 1, the sealing surface of the spherical valve 2 is a spherical surface, and the sealing ring 6 is in line contact with the spherical surface of unequal radius in the manner of contacting the spherical valve 2, so that the self-alignment capability is provided, wherein the spherical radius of the spherical surface structure in the sealing ring 6 is larger than that of the sealing surface in the spherical valve 2; in addition, the fluoroplastic material is adopted to replace a rubber material to serve as the material of the sealing ring 6, and the fluoroplastic has a self-lubricating function, so that a good lubricating effect can be achieved without coating lubricating grease between the sealing ring 6 and the spherical valve 2.
Further, the shear strength of the sealing ring 6 formed by the fluoroplastic material is generally higher than that of the rubber material, so that the fluoroplastic adopted as the material of the sealing ring 6 does not have a rubber cutting phenomenon under possible working conditions of the aviation fuel ball valve. Moreover, the specific sealing pressure of the sealing ring 6 formed by the fluoroplastic material is far lower than that of the metal material, so that good sealing performance can be maintained under the working pressure of the aviation fuel system.
Based on the above description, in the embodiment of the present invention, fluoroplastic is used to replace rubber as a material of the sealing ring 6, so that not only can a rubber cutting phenomenon occurring in a traditional ball valve due to the fact that a rubber material is used as a material of a sealing structure of the ball valve be avoided, but also a bidirectional sealing structure is not required to be adopted as in the traditional ball valve due to the characteristic of no rubber cutting phenomenon, that is, a unidirectional sealing structure can be used to replace a bidirectional sealing structure without reducing the functional performance and reliability of a product, thereby achieving the effect of reducing the cost of the ball valve.
As shown in fig. 1, the globe shutter 2 has a central axis; the spherical valve 2 is used for enabling the through hole 21 to be opposite to the spherical structure at one end of the sealing ring 6 through axial rotation along the central shaft, so that the one-way sealing ball valve is in a conducting state, a medium flowing channel is formed, and a medium flows out through the pipe joint 5. Fig. 1 shows the conducting state of the one-way sealing ball valve, at this time, the direction of the through hole 21 of the ball valve 2 is the same as the channel direction of the sealing ring 6, a medium flowing channel is formed inside the one-way sealing ball valve, and the medium flows out through the pipe joint 5.
The spherical valve 2 in the embodiment of the invention is also used for enabling the spherical sealing surface of the spherical valve to be attached to the spherical structure of the sealing ring 6 through axial rotation along the central shaft, so that the one-way sealing ball valve is in a closed state, and the spherical structure of the sealing ring 6 and the spherical sealing surface of the spherical valve 2 form a sealing pair under the action of the pretightening force of the spring 4 and the system pressure.
For the one-way sealing ball valve provided by the embodiment of the invention, when the ball valve is required to cut off system fuel, the ball valve 2 shown in fig. 1 can be driven to rotate by 90 degrees, at this time, the direction of the through hole 21 of the ball valve 2 is vertical to the direction of the channel of the sealing ring 6, the spherical sealing surface of the ball valve 2 is attached to the spherical structure of the sealing ring 6, and the sealing ring 6 and the ball valve 2 form a sealing pair under the action of the pretightening force of the spring 4.
Optionally, as shown in fig. 1, the one-way sealing ball valve provided in the embodiment of the present invention may further include: a seal ring 7 disposed between the seal ring 6 and the housing 1, the seal ring 7 being for external sealing; in addition, the method can also comprise the following steps: a sealing ring 3 arranged between the support end 52 of the pipe connection 5 and the housing 1, which sealing ring 3 is likewise used for external sealing.
In practical applications, the sealing ring 6 is sealed with the housing 1 by the O-ring 7, and the pipe joint 5 is sealed with the housing 1 by the O-ring 3.
The one-way sealing ball valve provided by the embodiment of the invention adopts a sealing ring processed by fluoroplastic materials to form a sealing pair with a spherical valve, the ball valve is the one-way sealing ball valve which realizes sealing under the action of system pressure and the pretightening force of a spring, and the ball valve is provided with a shell, wherein the spherical valve, the sealing ring, a pipe joint and the spring are arranged in the shell; the sealing surface of the spherical valve is a spherical surface, the sealing ring is made of fluoroplastic, the sealing ring is in contact with the spherical valve in a linear contact mode through spherical surfaces with unequal radii, the spherical surfaces with unequal radii are in contact and have self-alignment capability, the spherical radius of the sealing ring is larger than that of the spherical valve, and the spherical valve and the sealing ring form a sealing structure under the action of the pretightening force of a spring and the system pressure. The one-way sealing ball valve provided by the embodiment of the invention is convenient to assemble and high in reliability; the rubber cutting phenomenon of the fuel system ball valve can be solved, in addition, the product cost can be reduced, the product weight can be reduced, and great significance is provided for realizing reliability increase, pollution source control, cost reduction, weight reduction and the like of an aircraft fuel system.
Although the embodiments of the present invention have been described above, the above description is only for the convenience of understanding the present invention, and is not intended to limit the present invention. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (8)
1. A one-way sealing ball valve, comprising: the ball valve, the sealing ring, the spring, the pipe joint and the shell;
the spherical part of the spherical valve is provided with a through hole and spherical sealing surfaces positioned at two sides of the through hole, and one end of the sealing ring, which is in contact with the spherical valve, is of a spherical structure; the sealing ring is formed by fluoroplastic materials and is used for forming a sealing pair with the spherical valve through the contact of a spherical structure at one end of the sealing ring and a spherical sealing surface in the spherical valve;
the other end of sealing ring is provided with the boss, the coupling includes joint end and support end, the one end of spring supports and leans on the sealing ring has the one end of boss, the support end of coupling with the boss laminating setting of sealing ring, just the sleeve of support end nestification is in the outside of spring and makes the other end of spring supports and leans on support the sleeve inner wall of end, the casing nestification is in spherical valve the sealing ring with the outside of support end one side of coupling.
2. The one-way sealed ball valve according to claim 1, wherein the sealing ring is in contact with the ball shutter in a manner of spherical line contact with unequal radii.
3. The ball check seal valve of claim 2 wherein the spherical radius of the spherical structure in said seal ring is greater than the spherical radius of the seal face in said ball trap.
4. The ball check valve according to any one of claims 1 to 3, wherein the sealing ring formed of the fluoroplastic material has a shear strength greater than that of the rubber material.
5. The one-way sealing ball valve according to any one of claims 1 to 3, wherein the sealing ring formed by the fluoroplastic material has a specific sealing pressure lower than that of the metal material.
6. A one-way sealed ball valve according to any one of claims 1 to 3, wherein the ball shutter has a central axis;
the spherical valve is used for enabling the through hole of the spherical valve to be opposite to the spherical structure at one end of the sealing ring through axial rotation along the central shaft, so that the one-way sealing ball valve is in a conducting state, a medium flowing channel is formed, and a medium flows out through the pipe joint.
7. The one-way sealing ball valve of claim 6,
the spherical valve is also used for enabling the spherical sealing surface of the spherical valve to be attached to the spherical structure of the sealing ring through axial rotation along the central shaft, so that the one-way sealing ball valve is in a closed state, and the spherical structure of the sealing ring and the spherical sealing surface of the spherical valve form a sealing pair under the action of the pretightening force of the spring.
8. The ball check seal valve according to any one of claims 1 to 3, further comprising: the sealing ring is arranged between the sealing ring and the shell and used for external sealing;
and a sealing ring arranged between the pipe joint support end and the shell and used for external sealing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911380214.5A CN110953371A (en) | 2019-12-27 | 2019-12-27 | One-way sealing ball valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911380214.5A CN110953371A (en) | 2019-12-27 | 2019-12-27 | One-way sealing ball valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110953371A true CN110953371A (en) | 2020-04-03 |
Family
ID=69984750
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911380214.5A Pending CN110953371A (en) | 2019-12-27 | 2019-12-27 | One-way sealing ball valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110953371A (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1214660A (en) * | 1967-10-09 | 1970-12-02 | Hills Mccanna Co | Ball valve having progressive engagement of ball and yieldable seat |
| TW386151B (en) * | 1996-11-08 | 2000-04-01 | Pfannenschmidt Gmbh | Ball cock |
| JP2000120874A (en) * | 1998-10-20 | 2000-04-28 | Ishino Gasket Kogyo Kk | Spherical gasket for spherical pipe coupling |
| CN2539887Y (en) * | 2002-04-16 | 2003-03-12 | 张宝群 | One-way sealing ball valve |
| CN1425112A (en) * | 1999-11-23 | 2003-06-18 | 斯瓦戈洛克公司 | Ball valve seat seal |
| CN102734484A (en) * | 2011-03-31 | 2012-10-17 | 上海耐莱斯·詹姆斯伯雷阀门有限公司 | Lifting rod-type ball valve |
| CN204755990U (en) * | 2015-07-28 | 2015-11-11 | 浙江中诚阀门有限公司 | Grey ball valve is unloaded in pneumatics |
-
2019
- 2019-12-27 CN CN201911380214.5A patent/CN110953371A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1214660A (en) * | 1967-10-09 | 1970-12-02 | Hills Mccanna Co | Ball valve having progressive engagement of ball and yieldable seat |
| TW386151B (en) * | 1996-11-08 | 2000-04-01 | Pfannenschmidt Gmbh | Ball cock |
| JP2000120874A (en) * | 1998-10-20 | 2000-04-28 | Ishino Gasket Kogyo Kk | Spherical gasket for spherical pipe coupling |
| CN1425112A (en) * | 1999-11-23 | 2003-06-18 | 斯瓦戈洛克公司 | Ball valve seat seal |
| CN2539887Y (en) * | 2002-04-16 | 2003-03-12 | 张宝群 | One-way sealing ball valve |
| CN102734484A (en) * | 2011-03-31 | 2012-10-17 | 上海耐莱斯·詹姆斯伯雷阀门有限公司 | Lifting rod-type ball valve |
| CN204755990U (en) * | 2015-07-28 | 2015-11-11 | 浙江中诚阀门有限公司 | Grey ball valve is unloaded in pneumatics |
Non-Patent Citations (1)
| Title |
|---|
| 化学工业部人事教育司: "《阀门》", 31 March 1997, 化学工业出版社 * |
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Application publication date: 20200403 |