CN111306316A - Ball body with special-shaped flow channel and ball valve - Google Patents
Ball body with special-shaped flow channel and ball valve Download PDFInfo
- Publication number
- CN111306316A CN111306316A CN202010144360.4A CN202010144360A CN111306316A CN 111306316 A CN111306316 A CN 111306316A CN 202010144360 A CN202010144360 A CN 202010144360A CN 111306316 A CN111306316 A CN 111306316A
- Authority
- CN
- China
- Prior art keywords
- valve
- ball
- sphere
- packing gland
- packing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
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
- F16K5/0605—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
-
- 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
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/44—Mechanical actuating means
- F16K31/60—Handles
-
- 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
-
- 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
- F16K5/0694—Spindle sealings
-
- 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
Abstract
The invention discloses a ball body and a ball valve with a special-shaped flow passage, and relates to the technical field of valves. The ball body and the ball valve of the special-shaped flow passage provided by the invention can reduce scouring and abrasion, improve the wear resistance and prolong the service life.
Description
Technical Field
The invention relates to the technical field of valves, in particular to a ball body with a special-shaped flow passage and a ball valve.
Background
At present, the traditional ball valve seat anti-scouring basically prevents medium scouring by spraying hard alloy with different thicknesses and different materials. In the opening and closing process of the ball valve, the valve is subjected to washing and generates vibration to cause huge impact force on the valve and a pipeline, so that a spraying layer of the valve falls off, and the valve is leaked. Once the valve leaks, the whole production material is wasted, and the production benefit is seriously influenced. In addition, if the medium is toxic gas, high-temperature and high-pressure working conditions and flammable and explosive medium, the leakage of the toxic gas can cause the instantaneous death of workers; and some leakage will generate fire and even explosion, causing serious safety accidents to endanger the life and property safety of people. The technical problem is not completely solved so far, and therefore, the targeted development of a ball valve with high efficiency, low energy and good vibration resistance and sealing performance is a major problem in the pump valve industry.
Disclosure of Invention
In order to solve the technical problems, the invention provides a ball body and a ball valve with special-shaped flow passages, which can reduce scouring and abrasion, improve the abrasion resistance and prolong the service life.
In order to achieve the purpose, the invention provides the following scheme:
the invention provides a sphere with a special-shaped flow channel, wherein the cross section of the flow channel of the sphere is a regular polygon.
Preferably, the regular polygon is a square.
The invention also provides a ball valve, which comprises a ball body of the special-shaped flow passage, a valve body, a valve cover, a valve rod, a handle, a positioning sheet, a winding gasket, a packing gland and two valve seats, wherein the valve body is fixedly connected with the valve cover, the winding gasket is arranged in a groove between the valve body and the valve cover, the ball body is positioned in a valve cavity formed by the valve body and the valve cover, the two valve seats are respectively arranged at two sides of the ball body and are tangent to the ball body, a valve seat hole is respectively arranged in the valve body and the valve cover, the two valve seats are respectively arranged in the two valve seat holes, the valve body is provided with the packing and a valve rod hole, the packing is arranged in the packing box, the packing is tightly pressed in the packing box through the packing gland, the packing gland is fixedly connected with the valve body, and the valve rod sequentially penetrates through the, The packing and the valve rod hole, the lower end of the valve rod is connected with the ball body, the upper end of the valve rod is connected with the handle, the upper end of the valve rod is sleeved with the positioning piece, and the positioning piece is arranged between the packing gland and the handle.
Preferably, the upper end of the ball body is provided with a first flat square groove, the lower end of the valve rod is provided with a first flat square, and the first flat square is matched with the first flat square groove in structure.
Preferably, the upper end of the valve rod is provided with a second flat square groove, the lower end of the handle is provided with a second flat square, the second flat square is structurally matched with the second flat square groove, and the handle is limited on the valve rod through two shaft elastic check rings.
Preferably, the valve body and the valve cover form a fixed connection through a bolt and a nut.
Preferably, the packing gland and the valve body form a fixed connection through a bolt and a nut.
Compared with the prior art, the invention has the following technical effects:
according to the sphere with the special-shaped flow channel and the ball valve, the cross section of the flow channel of the sphere is in the shape of a regular polygon, and compared with a traditional flow channel with a circular cross section, the cross section of the flow channel at the moment of opening or closing is increased, so that the flow speed is reduced, scouring and abrasion are reduced, and the service life and the sealing performance of the ball valve are further improved. Meanwhile, the opening and closing process of the ball valve is stable, the influence on the aspects of ball valve vibration, cavitation and the like can be reduced, the service performance of the ball valve is improved, the ball valve is more wear-resistant, and the service life of the ball valve is greatly prolonged.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a sphere of a special-shaped flow channel provided in the first embodiment of the present invention;
FIG. 2 is a schematic diagram of a prior art sphere;
FIG. 3 is a schematic view illustrating the installation of the ball and the valve seat of the irregular flow channel provided in the first embodiment of the present invention;
FIG. 4 is a schematic view of a prior art ball and seat assembly;
fig. 5 is a schematic view illustrating an opening angle of a sphere of the irregular flow channel according to the first embodiment of the present invention;
FIG. 6 is a cross-sectional view of a ball valve provided in a second embodiment of the present invention;
fig. 7 is a top view of a ball valve provided in the second embodiment of the present invention.
Description of reference numerals: 1. 1' -a sphere; 2. 2' -a flow channel; 3. 3' -a valve seat; 4. 4' -flow channel cross section; 5-a valve body; 6-valve cover; 7-winding a gasket; 8-valve stem; 9-a filler; 10-a packing gland; 11-a positioning sheet; 12-a handle.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention aims to provide a ball body and a ball valve with special-shaped flow passages, which can reduce scouring and abrasion, improve the abrasion resistance and prolong the service life.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
The first embodiment is as follows:
as shown in fig. 1, the present embodiment provides a sphere with a special-shaped flow channel, and the cross section of the flow channel 2 of the sphere 1 is a regular polygon.
As shown in fig. 2, the cross section of the flow channel 2 'of the ball body 1' of the existing ball valve is circular, and the flow channel 2 'of the ball body 1' is washed by a large amount at the moment of opening or closing, and the wear resistance is relatively weak.
The working principle of the valve is that when a flow channel medium flows through the valve seat and the ball body in an opening state, the larger the area is and the slower the flow rate is under the same flow and pressure, the smaller the scouring of the medium on the sealing surface of the valve is, and the service life of the valve is further prolonged. Compared with the existing structure, the flow channel 2 of the ball body 1 is set to be the regular polygon in the embodiment, so that the sectional area of the flow channel is increased at the opening or closing moment of the valve, the flow rate of the medium is low, the erosion is small, the abrasion is reduced, and the problems of serious erosion and abrasion of the ball mouth of the ball body caused by high-speed flow formed at the opening or closing moment of the ball valve by solid particles in solid/liquid or solid/gas two-phase flow are solved. Meanwhile, the opening and closing process of the valve is stable, the influences of vibration, cavitation and the like of the valve can be reduced, the service performance of the valve is improved, the valve is more wear-resistant, and the service life of the valve is greatly prolonged.
In this embodiment, the regular polygon is a square, that is, the cross section of the flow channel 2 of the sphere 1 in this embodiment is a square.
As shown in fig. 3, the ball 1 of the present embodiment is rotated with a certain angle with respect to the valve seat 3 to form a flow path section 4, and as shown in fig. 4, the conventional ball 1 ' is rotated with a certain angle with respect to the valve seat 3 ' to form a flow path section 4 '. As shown in fig. 5, the opening angle of the sphere is a. The comparison of the cross-sectional areas of the circular flow passage and the square flow passage at the moment of opening (taking DN50Q341F-25C ball valve as an example) is carried out under the conditions that the valve seats have the same size, the sealing surfaces have the same size, the pressure difference before and after the flow passage is the same, the outer diameter of the ball body is the same, and the flow area of the flow passage is the same:
table 1: comparison table for cross-sectional areas of circular runner and square runner at opening moment
It can be obtained from table 1 that when other variables are controlled to be consistent, only the shape of the flow channel is changed, and when the circular flow channel is opened at the same angle, the cross-sectional area of the flow channel is small at the opening moment of the sphere 1' of the circular flow channel, the flow velocity is high, and the erosion to the sealing surface is large; the cross section area of the flow channel of the sphere 1 with the square flow channel is large at the opening moment, the flow speed is low, the erosion on the sealing surface is small, and the service life and the sealing performance of the valve are effectively improved.
Example two:
as shown in fig. 6 to 7, the present embodiment provides a ball valve, which includes a ball body 1 having a special-shaped flow channel in the first embodiment, a valve body 5, a valve cover 6, a valve rod 8, a handle 12, a positioning plate 11, a winding gasket 7, a packing 9, a packing gland 10, and two valve seats 3, wherein the valve body 5 is fixedly connected with the valve cover 6, the winding gasket 7 is disposed in a groove between the valve body 5 and the valve cover 6, and a sealing effect is achieved by compressing the winding gasket 7; the ball body 1 is located in a valve cavity formed by the valve body 5 and the valve cover 6, the two valve seats 3 are respectively arranged on two sides of the ball body 1 and tangent to the ball body 1, valve seat holes are respectively arranged in the valve body 5 and the valve cover 6, the two valve seats 3 are respectively arranged in the two valve seat holes, a stuffing box and a valve rod hole are arranged on the valve body 5, the stuffing 9 is arranged in the stuffing box, the stuffing 9 is tightly pressed in the stuffing box through the stuffing cover 10, the stuffing cover 10 is fixedly connected with the valve body 5, the valve rod 8 sequentially penetrates through the stuffing cover 10, the stuffing 9 and the valve rod hole, the stuffing 9 is compressed at the valve rod 8 to play a sealing role, the lower end of the valve rod 8 is connected with the ball body 1, the upper end of the valve rod 8 is connected with the handle 12, the positioning sheet 11 is sleeved on the upper end of the valve rod 8.
Specifically, 1 upper end of spheroid is provided with first flat square groove, and the valve rod 8 lower extreme is provided with first flat square, first flat square and first flat square groove structure phase-match, and first flat square block joint is in first flat square groove.
Specifically, the upper end of the valve rod 8 is provided with a second flat square groove, the lower end of the handle 12 is provided with a second flat square block, the second flat square block is matched with the second flat square groove in structure, the second flat square block is clamped in the second flat square groove, and the handle 12 is limited on the valve rod 8 through two shaft elastic check rings.
In this embodiment, the valve body 5 and the bonnet 6 are fixedly connected by bolts and nuts, and the packing gland 10 and the valve body 5 are fixedly connected by bolts and nuts.
The principle and the implementation mode of the present invention are explained by applying specific examples in the present specification, and the above descriptions of the examples are only used to help understanding the method and the core idea of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (7)
1. The sphere with the special-shaped flow passage is characterized in that the cross section of the flow passage of the sphere is a regular polygon.
2. The contoured flow channel sphere of claim 1, wherein said regular polygon is a square.
3. A ball valve, which comprises the sphere of the irregular flow passage, a valve body, a valve cover, a valve rod, a handle, a positioning sheet, a winding gasket, a packing gland and two valve seats, wherein the sphere of the irregular flow passage is as claimed in any one of claims 1 to 2, the valve body is fixedly connected with the valve cover, the winding gasket is arranged in a groove between the valve body and the valve cover, the sphere is positioned in a valve cavity formed by the valve body and the valve cover, the two valve seats are respectively arranged at two sides of the sphere and tangent to the sphere, a valve seat hole is respectively arranged in the valve body and the valve cover, the two valve seats are respectively arranged in the two valve seat holes, the valve body is provided with the packing gland and a valve rod hole, the packing is arranged in the packing gland, the packing is tightly pressed in the packing gland through the packing gland, and the packing gland is fixedly connected with the valve body, the valve rod penetrates through the packing gland, the packing and the valve rod hole in sequence, the lower end of the valve rod is connected with the ball body, the upper end of the valve rod is connected with the handle, the upper end of the valve rod is sleeved with the positioning piece, and the positioning piece is arranged between the packing gland and the handle.
4. The ball valve of claim 3, wherein the ball body is provided with a first flat square groove at an upper end thereof, and the valve stem is provided with a first flat block at a lower end thereof, the first flat block being configured to mate with the first flat square groove.
5. The ball valve according to claim 3, wherein the upper end of the valve stem is provided with a second flat square groove, the lower end of the handle is provided with a second flat square block, the second flat square block is structurally matched with the second flat square groove, and the handle is limited on the valve stem through two shaft elastic check rings.
6. The ball valve according to claim 3, wherein the valve body and the bonnet are fixedly connected by a bolt and a nut.
7. The ball valve of claim 3, wherein the packing gland forms a fixed connection with the valve body via a bolt and nut.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010144360.4A CN111306316A (en) | 2020-03-04 | 2020-03-04 | Ball body with special-shaped flow channel and ball valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010144360.4A CN111306316A (en) | 2020-03-04 | 2020-03-04 | Ball body with special-shaped flow channel and ball valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111306316A true CN111306316A (en) | 2020-06-19 |
Family
ID=71146484
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010144360.4A Pending CN111306316A (en) | 2020-03-04 | 2020-03-04 | Ball body with special-shaped flow channel and ball valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111306316A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113927245A (en) * | 2020-07-14 | 2022-01-14 | 台湾控制阀股份有限公司 | Machining method of ball plug for diverter valve and ball plug |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2700655Y (en) * | 2004-04-19 | 2005-05-18 | 王建敏 | Ultra-thin type leakage proof all-pass diameter flange ball valve |
| CN201322134Y (en) * | 2008-12-12 | 2009-10-07 | 福建菲达阀门有限公司 | Ball valve spanner |
| KR20120009187A (en) * | 2010-07-23 | 2012-02-01 | (주)스텝이엔지 | Ball valve for controlling of flow |
| CN202402689U (en) * | 2012-01-11 | 2012-08-29 | 温州龙德设备有限公司 | Ball valve with rectangular flow channels |
| CN204025745U (en) * | 2014-08-11 | 2014-12-17 | 湖北裕兴机械有限公司 | Modified model three-flat ball valve |
| CN205064904U (en) * | 2015-10-26 | 2016-03-02 | 王张勇 | Wear -resisting ball valve is opened and close to high frequency |
| CN209444839U (en) * | 2019-01-31 | 2019-09-27 | 成都斯杰化工机械有限公司 | A kind of wear-resisting accurate adjustment ball valve of square hole runner |
-
2020
- 2020-03-04 CN CN202010144360.4A patent/CN111306316A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2700655Y (en) * | 2004-04-19 | 2005-05-18 | 王建敏 | Ultra-thin type leakage proof all-pass diameter flange ball valve |
| CN201322134Y (en) * | 2008-12-12 | 2009-10-07 | 福建菲达阀门有限公司 | Ball valve spanner |
| KR20120009187A (en) * | 2010-07-23 | 2012-02-01 | (주)스텝이엔지 | Ball valve for controlling of flow |
| CN202402689U (en) * | 2012-01-11 | 2012-08-29 | 温州龙德设备有限公司 | Ball valve with rectangular flow channels |
| CN204025745U (en) * | 2014-08-11 | 2014-12-17 | 湖北裕兴机械有限公司 | Modified model three-flat ball valve |
| CN205064904U (en) * | 2015-10-26 | 2016-03-02 | 王张勇 | Wear -resisting ball valve is opened and close to high frequency |
| CN209444839U (en) * | 2019-01-31 | 2019-09-27 | 成都斯杰化工机械有限公司 | A kind of wear-resisting accurate adjustment ball valve of square hole runner |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113927245A (en) * | 2020-07-14 | 2022-01-14 | 台湾控制阀股份有限公司 | Machining method of ball plug for diverter valve and ball plug |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111306316A (en) | Ball body with special-shaped flow channel and ball valve | |
| CN206816887U (en) | A kind of HTHP difference tandem balanced type regulating valve | |
| CN106122507B (en) | Cavitation-resistant ball valve | |
| CN103821949A (en) | Cascading valve clack type adjusting valve | |
| CN209444839U (en) | A kind of wear-resisting accurate adjustment ball valve of square hole runner | |
| CN207701774U (en) | A kind of erosion prevention cut-off valve | |
| CN203614823U (en) | Ceramic seal rotary-opening and slowly-closing type check valve | |
| CN105443796A (en) | Metal sealing wear-resisting ball valve | |
| CN202691171U (en) | High pound level forged steel full-open swing check valve | |
| CN102620015A (en) | Nuclear class 1 large caliber forged steel full circulation high-Cv value swing check valve | |
| CN202691085U (en) | Electric metal sealing butterfly valve | |
| CN105065701A (en) | Hard sealing lifting type brake plug valve and control method thereof | |
| CN201561154U (en) | Metal hard seal ball valve for severe working condition | |
| CN110848429A (en) | Cut-off double-purpose valve | |
| CN204828735U (en) | Promotion formula floodgate plug valve sealed firmly | |
| CN114593253A (en) | Special high-pressure ceramic valve resistant to scouring | |
| CN201100444Y (en) | Ball valve with metal hard sealing body valve base | |
| CN210715963U (en) | Double-cutoff self-sealing high-pressure stop valve | |
| CN211875110U (en) | High-temperature high-pressure integrated straight-flow stop valve | |
| CN205331476U (en) | Metal seal abrasion -proof ball valve | |
| CN201651333U (en) | Special valve for chlorine gas | |
| CN206600487U (en) | Eccentric rotary valve | |
| CN218094365U (en) | High-temperature high-pressure drainage ball valve | |
| CN214063848U (en) | High-frequency opening and closing wear-resistant ball valve | |
| CN202851994U (en) | Stop valve |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20200619 |