CN102878317A - Pneumatic ball valve reliable in sealing and low in opening-closing torque - Google Patents
Pneumatic ball valve reliable in sealing and low in opening-closing torque Download PDFInfo
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- CN102878317A CN102878317A CN201210410089XA CN201210410089A CN102878317A CN 102878317 A CN102878317 A CN 102878317A CN 201210410089X A CN201210410089X A CN 201210410089XA CN 201210410089 A CN201210410089 A CN 201210410089A CN 102878317 A CN102878317 A CN 102878317A
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Abstract
The invention relates to a valve, in particular to a pneumatic ball valve reliable in sealing and low in opening-closing torque. The pneumatic ball valve comprises a ball valve body with a valve cavity, a ball positioned in the valve cavity, a valve rod in linkage with the ball and a valve seat sealing mechanism arranged between the ball valve body and the ball. A valve seat component and an annular valve seat component cavity are in airtight fit to form a structure similar to a piston. A pre-tensioning elastic part and a three-way reversing valve are arranged on one side, opposite to the ball, of the ball valve body. The three-way reversing valve and a pressure control reversing valve are used for controlling pressure applied to the ball by the valve seat component under different conditions and an operating air source of a pneumatic device to realize the fact that when the valve is closed, the pressure applied to the ball by the valve seat component is large, the sealing performance is fine, and when the valve is opened, the pressure applied to the ball by the valve seat component is small. Therefore, the opening power is low, a ball sealing face and a valve seat sealing face are less prone to damage during opening, the service life of the ball valve is prolonged, and the pneumatic ball valve has a function of preventing misopertion of opening when large pressure is applied to the ball by the valve seat.
Description
Technical field
The present invention relates to a kind of valve, more particularly it relates to a kind of little pneumatic ball valve of reliable open and close torque that seals.
Background technique
Pneumatic ball valve is very widely valve of a kind of use, its structure generally include the ball valve body with valve pocket, the spheroid that places valve pocket inside, and the valve rod that is connected of spheroid and place ball valve body and spheroid between valve seat, described valve stem part is placed on the ball valve body outside, the ball valve body outside is provided with the Pneumatic actuator of actuate valve stem rotation, and Pneumatic actuator provides under the effect of pressurized gas 90 ° of rotations that drive spheroid by valve rod to make ball valve reach the switching of opening and closing at source of the gas.The valve base sealing structure of tradition fixing ball valve and force analysis are as shown in Figure 1, 2,1A is spheroid among the figure, 2A is valve seat insert, 3A is valve seat, 4A is spring, 5A is ball valve body, and 6A is the sealing between ball valve body and the valve seat, and the sealing between spheroid and the valve seat insert normally relies on the pretightening force of spring and acts on making a concerted effort of valve seat these two power of medium power behind.Usually the pretightening force of spring only is in order to ensure the fitting tightly of spheroid and valve seat insert, and namely plays initial seal action.The cross section of valve seat is equivalent to a piston, can change the size that acts on medium power on the valve seat by the design that changes valve seat, and the differential pressure area that increases valve seat can increase the thrust of medium.For the spheroid that improves ball valve and the sealability between the valve seat insert, act on valve seat medium power behind by increasing and namely can realize.Yet it is larger to act on valve seat medium power behind, and the adhesive force between spheroid and the valve seat insert is larger, and the frictional force between them is also larger, just needs larger steering force during Open valve, perhaps needs larger driving mechanism.In addition, when the sealing force between spheroid and the valve seat insert is excessive, when Open valve, cause easily the damage of valve sealing face, particularly when containing solid particle in the medium, easier damage.In a word, from improving the angle of valve base seal property, need to increase valve seat medium thrust behind, but, from the open and close torque that reduces valve and the angle that prevents the damage of sealing surface, need to reduce valve seat medium thrust behind, therefore, this is conflict, and this contradiction is perplexing the design of ball valve for a long time.
Summary of the invention
For the deficiency that prior art exists, the object of the present invention is to provide a kind of seal reliable and the little pneumatic ball valve of open and close torque.
For achieving the above object, the invention provides following technological scheme: a kind of little pneumatic ball valve of reliable open and close torque that seals, comprise the ball valve body with valve pocket, place the spheroid of valve pocket inside, and the valve rod that spheroid is connected and place ball valve body and spheroid between valve seat sealing mechanism, the valve pocket both sides respectively with inlet passage and outlet passage UNICOM, described valve stem part is placed on the ball valve body outside, the ball valve body outside is provided with the Pneumatic actuator of actuate valve stem rotation, it is characterized in that: described valve seat sealing mechanism comprises ring valve holder assembly and three-way diverter valve, described ball valve body internal chamber wall is provided with opening towards the ring valve holder assembly chamber of spheroid, the relative spheroid of described valve component is slidably disposed in the ring valve holder assembly chamber, described valve component and ring valve holder assembly chamber air-tight fit consist of similar piston structure, a described ball valve body dorsad side of spheroid is provided with the pretension elastic component, described ball valve body is provided with and the valve component valve support chamber passage that is connected of the ring valve holder assembly chamber conducting of spheroid one side dorsad, three interfaces of described three-way diverter valve respectively with the valve support chamber passage, inlet passage and outlet passage UNICOM, under the valve closing state, described inlet passage is through three-way diverter valve and described valve support chamber passage UNICOM, when valve opening, described valve support chamber passage is through three-way diverter valve and outlet passage UNICOM; Described pneumatic ball valve also is provided with pressure control selector valve, described pressure control selector valve is serially connected in the air feed source of the gas pipeline of Pneumatic actuator, described pressure control selector valve is normally off, when the pressure of outlet passage and the pressure difference in ring valve holder assembly chamber reach setting value, pressure control selector valve is open-minded.
By adopting technique scheme, be that ball valve is when closing when spheroid is in closed position, in order to ensure the valve reliable sealing, handle three-way diverter valve, make valve support chamber passage and inlet passage UNICOM and disconnect with outlet passage, at this moment, the medium of valve inlet side elevated pressures enters into ring valve holder assembly chamber, pressure medium promotes valve component and is affixed to spheroid, thereby forms tight sealing.When needs are opened, switching three-way selector valve at first, make valve support chamber passage and outlet passage UNICOM and disconnect with inlet passage, at this moment, the pressure that pressure in the ring valve holder assembly chamber and valve export side are lower is identical, the pressure of valve component both sides is in a basic balance, the pressure that valve component is affixed to spheroid only comes from the pretension elastic component, and the elasticity pretightening force of pretension elastic component is usually less, at this moment, valve component is very little to pressure and the sealing force of spheroid, therefore the frictional force of sealing surface is also very little, can adopt less torque force to open ball valve, Pneumatic actuator Open valve that namely can selection of small, reduce the volume of valve, reduced cost; In addition, because when Open valve, the sealing force of valve component and spheroid is very little, therefore, is not easy to cause the damage of ball seal face, has prolonged working life, solved the contradiction that opens and closes between torsion and the ball valve sealing performance.In addition, wherein the break-make of pressure control selector valve is decided by the pressure of valve export passage and the pressure difference value in ring valve holder assembly chamber, when both pressure differences during greater than a certain setting value, show that ring valve holder assembly chamber is communicated with the inlet passage of valve, and valve advances, the pressure reduction of outlet passage is larger, this moment, valve component and spheroid fitted tightly, pressure control this moment selector valve disconnects, be that Pneumatic actuator and source of the gas disconnect, therefore can't carry out by Pneumatic actuator the switch motion of valve, prevent that between valve component and spheroid frictional force from opening ball valve by Pneumatic actuator in large and causing damage to sealing surface; And when both pressure reduction during less than a certain setting value, the pressure difference that shows ring valve holder assembly chamber and valve export channel connection or valve inlet/outlet passage is less, sealing force and frictional force are less between valve component and the spheroid at this moment, the conducting of pressure control this moment selector valve, be that Pneumatic actuator and source of the gas are connected, therefore can carry out by Pneumatic actuator the action of valve switch, so just improve safety factor, prevent that misoperation from bringing the infringement to ball valve.
The present invention further is set to: described ring valve holder assembly chamber is that the approximate rectangular annular groove in cross section consists of, described valve component comprises sectional shape and annular groove cross section the ring valve seat body that matches and the valve seat insert that is embedded on the ring valve seat body, be equipped with seal ring on the inside-and-outside ring sidewall of described ring valve seat body and contact the described piston structure of formation with the sidewall sealing in ring valve holder assembly chamber, sealing surface and the spheroid of described valve seat insert are affixed, described ring valve seat body evenly is provided with a plurality of spring cavity volumes with being provided with on the opposing face of valve seat insert, be provided with Compress Spring in the described spring cavity volume and consist of described pretension elastic component; The pipeline that is provided with annular groove bottom UNICOM near the position in ring valve holder assembly chamber on the described ball valve body consists of described valve support chamber passage.
By adopting ring valve holder assembly chamber and the valve component of said structure, relatively simple for structure, easy to make.
The present invention further is set to: be provided with filtrating equipment in the pipeline of described three-way diverter valve and inlet passage and outlet passage UNICOM.
The solid impurity that flowing medium in pipe-line system contains enters into three-way diverter valve and ring valve holder assembly cavity, by taking in the pipeline of three-way diverter valve and inlet passage and outlet passage UNICOM, to be provided with filtrating equipment or piston mechanism, can prevent effectively that solid impurity from entering into three-way diverter valve and ring valve holder assembly cavity.
Description of drawings
Fig. 1 is existing ball seat portion structure sectional view;
Fig. 2 is the stressed schematic representation in existing ball seat position;
Fig. 3 is specific embodiment of the invention structural representation;
Fig. 4 is specific embodiment of the invention part-structure schematic representation when being provided with piston;
Fig. 5 is semispherical valve specific embodiment structural representation of the present invention;
Fig. 6 is specific embodiment of the invention pressure control structure of reversing valve schematic representation.
Embodiment
As shown in Figure 3, seal the little pneumatic ball valve of reliable open and close torque, comprise the ball valve body 1 with valve pocket, place the spheroid 2 of valve pocket inside, and the valve rod 3 that spheroid 2 is connected and place ball valve body 1 and spheroid 2 between valve seat sealing mechanism, the valve pocket both sides respectively with inlet passage 4 and outlet passage 5 UNICOMs, described valve rod 3 parts are placed on ball valve body 1 outside, ball valve body 1 outside is provided with the Pneumatic actuator 6 of actuate valve stem 3 rotations, described valve seat sealing mechanism comprises ring valve holder assembly and three-way diverter valve 7, described ball valve body 1 internal chamber wall is provided with opening towards the ring valve holder assembly chamber 8 of spheroid 2, the relative spheroid 2 of described valve component is slidably disposed in the ring valve holder assembly chamber 8, described valve component and ring valve holder assembly chamber 8 air-tight fit consist of similar piston structure, described ball valve body 1 a dorsad side of spheroid 2 is provided with pretension elastic component 9, described ball valve body 1 is provided with and the valve component valve support chamber path 10 that is connected of ring valve holder assembly chamber 8 conductings of spheroid 2 one sides dorsad, described three-way diverter valve 7 can be manual reverse of direction, it also can be solenoid directional control valve, three interfaces of described three-way diverter valve 7 respectively with the valve support chamber path 10, inlet passage 4 and outlet passage 5 UNICOMs, under the valve closing state, described inlet passage 4 is through three-way diverter valves 7 and described valve support chamber path 10 UNICOM, when valve opening, described valve support chamber path 10 is through three-way diverter valve 7 and outlet passage 5 UNICOMs; Described pneumatic ball valve also is provided with pressure control selector valve 11, described pressure control selector valve 11 is serially connected in the air feed source of the gas pipeline of Pneumatic actuator 6, described pressure control selector valve 11 is normally off, when the pressure of outlet passage 5 and the pressure difference in ring valve holder assembly chamber 8 reach setting value, pressure control selector valve 11 is open-minded.As shown in Figure 3, in this specific embodiment, described ring valve holder assembly chamber 8 is that the approximate rectangular annular groove in cross section consists of, described valve component comprises sectional shape and annular groove cross section the ring valve seat body 12 that matches and the valve seat insert 13 that is embedded on ring valve seat body 12, be equipped with seal ring 14 on the inside-and-outside ring sidewall of described ring valve seat body 12 and contact the described piston structure of formation with the sidewall sealing in ring valve holder assembly chamber 8, the sealing surface of described valve seat insert 13 and spheroid 2 are affixed, evenly be provided with a plurality of spring cavity volumes 15 on described ring valve seat body 12 face opposing with being provided with valve seat insert 13, general 3-6 gets final product, be provided with Compress Spring in the described spring cavity volume 15, the free length of Compress Spring slightly is longer than the degree of depth of spring cavity volume 15, and the bottom that two ends are against respectively spring cavity volume 15 and annular groove consists of described pretension elastic component 9.Described pretension elastic component 9 also can such as rubber, consider that the elastic module of spring is large, flexibly movable for other elastic materials consist of, and present embodiment is preferred.In order to prevent that ring valve seat body 12 from coming off, the opening in described ring valve holder assembly chamber 8 preferably is provided with annular pressing plate 17; The pipeline that is provided with annular groove bottom UNICOM near the position in ring valve holder assembly chamber 8 on the described ball valve body 1 consists of described valve support chamber path 10.Consider under some operating mode, flowing medium in the pipe-line system contains solid impurity, enter in three-way diverter valve 7 and the ring valve holder assembly chamber 8 for fear of impurity and to cause cisco unity malfunction, as shown in Figure 3, be provided with filtrating equipment or piston apparatus 19 in the pipeline of described three-way diverter valve 7 and inlet passage 4 and outlet passage 5 UNICOMs, left and right sides balance by piston in the piston apparatus 19 moves, make the ring valve holder assembly chamber 8 can be as required and the pressure balance of valve inlet end or outlet end, prevent that effectively solid impurity from entering into three-way diverter valve 7 and ring valve holder assembly chamber 8 simultaneously.Pressure control selector valve 11 can have various ways to realize, as shown in Figure 6, the similar stop valve of structure of pressure control selector valve 11 in this specific embodiment comprises commutation valve body 26, valve gap 21, flap 27 and commutation valve rod.Described valve gap 21 tops are integrally formed with a piston cavity, commutation valve rod 25 upper ends penetrate in the piston cavity, the upper end portion is fixedly connected with a piston piston cavity is divided into valve gap 21 upper piston chambeies 22 and lower piston chamber 23, penetrate in the piston cavity on the commutation valve rod 25 of part and be arranged with pressure adjusting spring 20, the import of pressure control selector valve 11 is connected with source of the gas 24, outlet is connected with the source of the gas input end of Pneumatic actuator 6, described valve gap 21 upper piston chambeies 22 and ring valve holder assembly chamber 8 UNICOMs, described lower piston chamber 23 and ball valve outlet passage 5 UNICOMs, reach described pressure control selector valve 11 and be normally off, when the pressure of outlet passage 5 and the pressure difference in ring valve holder assembly chamber 8 reach setting value, the function that pressure control selector valve 11 is opened.
These ring valve holder assembly chamber 8 and ring valve seat body 12 sectional shapes that seal the little ball valve of reliable open and close torque are not unique, as long as the central axes of the cylndrical surface at two annular sidewall place or parallel.
The present invention is fit to the pneumatic ball valve of semiglobe equally, and as shown in Figure 5, its structure is similar to the aforementioned embodiment, is one-sided one group of ring valve holder assembly chamber 8 and the valve component of being provided with.
The working principle that seals the little pneumatic ball valve of reliable open and close torque is as follows: be that ball valve is when closing when spheroid 2 is in closed position, handle three-way diverter valve 7, make valve support chamber path 10 and inlet passage 4 UNICOMs and disconnect with outlet passage 5, at this moment, the medium of valve inlet side elevated pressures enters into ring valve holder assembly chamber 8, pressure medium promotes valve component and is affixed to spheroid 2, thereby forms tight sealing.And when three-way diverter valve 7 make valve support chamber path 10 and inlet passage 4 UNICOMs and with outlet passage 5 disconnections, that is to say also do not carry out open ball valve preparation the time, pressure in the ring valve holder assembly chamber 8 is much larger than the pressure of valve export passage 5 at this moment, that is to say that pressure in the pressure control selector valve 11 valve gaps 21 upper piston chambeies 22 is greater than the pressure in the lower piston chamber 23, pressure control selector valve 11 cuts out, Pneumatic actuator 6 can not obtain the work source of the gas and can't work, avoided at the large pressure of valve component to spheroid 2, open ball valve under the state of large frictional force, ball valve is caused damage; When needs are opened ball valve, at first the switching three-way selector valve 7, make valve support chamber path 10 and outlet passage 5 UNICOMs and disconnect with inlet passage 4, at this moment, the pressure that pressure in the ring valve holder assembly chamber 8 and valve export side are lower is identical, the pressure of valve component both sides is in a basic balance, the pressure that valve component is affixed to spheroid 2 only comes from pretension elastic component 9, and the elasticity pretightening force of pretension elastic component 9 is usually less, at this moment, valve component is very little to pressure and the sealing force of spheroid 2, and the frictional force of sealing surface is also very little, therefore can adopt less torque force to open ball valve.Because the pressure that the pressure in the ring valve holder assembly chamber 8 and valve export side are lower at this moment is basic identical, under the effect of pressure adjusting spring 20, pressure in the pressure control selector valve 11 lower piston chambeies 23 is greater than the pressure in the valve gap 21 upper piston chambeies 22, pressure control selector valve 11 is opened, Pneumatic actuator 6 obtains the work source of the gas, can finish the action of opening ball valve.By adjusting the pressure of pressure adjusting spring 20, valve component is to the setting value of spheroid 2 pressure in the time of can regulating the unlatching of permission ball valve.
Claims (4)
1. one kind seals the little pneumatic ball valve of reliable open and close torque, comprise the ball valve body with valve pocket, place the spheroid of valve pocket inside, and the valve rod that spheroid is connected and place ball valve body and spheroid between valve seat sealing mechanism, the valve pocket both sides respectively with inlet passage and outlet passage UNICOM, described valve stem part is placed on the ball valve body outside, the ball valve body outside is provided with the Pneumatic actuator of actuate valve stem rotation, it is characterized in that: described valve seat sealing mechanism comprises ring valve holder assembly and three-way diverter valve, described ball valve body internal chamber wall is provided with opening towards the ring valve holder assembly chamber of spheroid, the relative spheroid of described valve component is slidably disposed in the ring valve holder assembly chamber, described valve component and ring valve holder assembly chamber air-tight fit consist of similar piston structure, a described ball valve body dorsad side of spheroid is provided with the pretension elastic component, described ball valve body is provided with and the valve component valve support chamber passage that is connected of the ring valve holder assembly chamber conducting of spheroid one side dorsad, three interfaces of described three-way diverter valve respectively with the valve support chamber passage, inlet passage and outlet passage UNICOM, under the valve closing state, described inlet passage is through three-way diverter valve and described valve support chamber passage UNICOM, when valve opening, described valve support chamber passage is through three-way diverter valve and outlet passage UNICOM; Described pneumatic ball valve also is provided with pressure control selector valve, described pressure control selector valve is serially connected in the air feed source of the gas pipeline of Pneumatic actuator, described pressure control selector valve is normally off, when the pressure of outlet passage and the pressure difference in ring valve holder assembly chamber reach setting value, pressure control selector valve is open-minded.
2. the little pneumatic ball valve of the reliable open and close torque of sealing according to claim 1, it is characterized in that: described ring valve holder assembly chamber is that the approximate rectangular annular groove in cross section consists of, described valve component comprises sectional shape and annular groove cross section the ring valve seat body that matches and the valve seat insert that is embedded on the ring valve seat body, be equipped with seal ring on the inside-and-outside ring sidewall of described ring valve seat body and contact the described piston structure of formation with the sidewall sealing in ring valve holder assembly chamber, sealing surface and the spheroid of described valve seat insert are affixed, described ring valve seat body evenly is provided with a plurality of spring cavity volumes with being provided with on the opposing face of valve seat insert, be provided with Compress Spring in the described spring cavity volume and consist of described pretension elastic component; The pipeline that is provided with annular groove bottom UNICOM near the position in ring valve holder assembly chamber on the described ball valve body consists of described valve support chamber passage.
3. the little pneumatic ball valve of the reliable open and close torque of sealing according to claim 1 is characterized in that: be provided with filtrating equipment in the pipeline of described three-way diverter valve and inlet passage and outlet passage UNICOM.
4. the little pneumatic ball valve of the reliable open and close torque of sealing according to claim 1 is characterized in that: be provided with piston apparatus in the pipeline of described three-way diverter valve and inlet passage and outlet passage UNICOM.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210410089.XA CN102878317B (en) | 2012-10-23 | 2012-10-23 | Pneumatic ball valve reliable in sealing and low in opening-closing torque |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210410089.XA CN102878317B (en) | 2012-10-23 | 2012-10-23 | Pneumatic ball valve reliable in sealing and low in opening-closing torque |
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| Publication Number | Publication Date |
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| CN102878317A true CN102878317A (en) | 2013-01-16 |
| CN102878317B CN102878317B (en) | 2014-03-12 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201210410089.XA Active CN102878317B (en) | 2012-10-23 | 2012-10-23 | Pneumatic ball valve reliable in sealing and low in opening-closing torque |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104791511A (en) * | 2014-01-19 | 2015-07-22 | 盐城圣科球阀有限公司 | Novel external control sealing ball valve |
| CN106641314A (en) * | 2016-11-18 | 2017-05-10 | 超达阀门集团股份有限公司 | Pneumatic ball valve with automatic sealing function |
| CN106763875A (en) * | 2017-01-12 | 2017-05-31 | 盐城市圣泰阀门有限公司 | A kind of superhigh temperature valve |
| CN107131316A (en) * | 2017-06-02 | 2017-09-05 | 永嘉县信诚科技服务有限公司 | Double-valve-seat is without friction electric-controlled ball valve |
| CN107255173A (en) * | 2017-06-02 | 2017-10-17 | 永嘉县信诚科技服务有限公司 | Automatically controlled plug valve |
| CN107975616A (en) * | 2017-11-28 | 2018-05-01 | 永嘉县信诚科技服务有限公司 | Automatic high temperature opens and closes electric-controlled ball valve without friction |
| CN109780253A (en) * | 2019-03-22 | 2019-05-21 | 吴金龙 | A kind of sealing of air sealed is without friction pneumatic semisphere valve and its control device |
| CN113028091A (en) * | 2021-02-27 | 2021-06-25 | 陈艳艳 | Ball valve |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104791511A (en) * | 2014-01-19 | 2015-07-22 | 盐城圣科球阀有限公司 | Novel external control sealing ball valve |
| CN106641314A (en) * | 2016-11-18 | 2017-05-10 | 超达阀门集团股份有限公司 | Pneumatic ball valve with automatic sealing function |
| CN106641314B (en) * | 2016-11-18 | 2019-05-28 | 超达阀门集团股份有限公司 | Pneumatic ball valve with automatic sealing function |
| CN106763875A (en) * | 2017-01-12 | 2017-05-31 | 盐城市圣泰阀门有限公司 | A kind of superhigh temperature valve |
| CN106763875B (en) * | 2017-01-12 | 2018-03-20 | 江苏圣泰阀门有限公司 | A kind of superhigh temperature valve |
| CN107131316A (en) * | 2017-06-02 | 2017-09-05 | 永嘉县信诚科技服务有限公司 | Double-valve-seat is without friction electric-controlled ball valve |
| CN107255173A (en) * | 2017-06-02 | 2017-10-17 | 永嘉县信诚科技服务有限公司 | Automatically controlled plug valve |
| CN107131316B (en) * | 2017-06-02 | 2018-10-30 | 永嘉县信诚科技服务有限公司 | Double-valve-seat is without friction electric-controlled ball valve |
| CN107975616A (en) * | 2017-11-28 | 2018-05-01 | 永嘉县信诚科技服务有限公司 | Automatic high temperature opens and closes electric-controlled ball valve without friction |
| CN109780253A (en) * | 2019-03-22 | 2019-05-21 | 吴金龙 | A kind of sealing of air sealed is without friction pneumatic semisphere valve and its control device |
| CN113028091A (en) * | 2021-02-27 | 2021-06-25 | 陈艳艳 | Ball valve |
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| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: CHAODA VALVE GROUP CO., LTD. Free format text: FORMER NAME: ZHEJIANG CHAODA VALVE CO., LTD. |
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| CP01 | Change in the name or title of a patent holder |
Address after: Jiangbei Avenue Oubei town of Yongjia County of Wenzhou City, Zhejiang province 325100 Patentee after: Chaoda Valve Group Co., Ltd. Address before: Jiangbei Avenue Oubei town of Yongjia County of Wenzhou City, Zhejiang province 325100 Patentee before: Zhejiang Chaoda Valve Co., Ltd. |