CN115711294A - Combined sealing fireproof butterfly valve - Google Patents
Combined sealing fireproof butterfly valve Download PDFInfo
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- CN115711294A CN115711294A CN202211350962.0A CN202211350962A CN115711294A CN 115711294 A CN115711294 A CN 115711294A CN 202211350962 A CN202211350962 A CN 202211350962A CN 115711294 A CN115711294 A CN 115711294A
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Abstract
The invention discloses a combined sealing fireproof butterfly valve, which comprises: the butterfly plate is positioned in a cavity of the valve body and fixed on the valve rod, and the valve rod and the butterfly plate divide the space into an inlet cavity and an outlet cavity; the butterfly plate and the valve body are sequentially provided with a bottom plate, a first valve seat, a first metal valve seat, a middle plate, a second valve seat, a second metal valve seat and an upper plate, and the first valve seat, the first metal valve seat, the second valve seat and the second metal valve seat are used for being in contact sealing with the butterfly plate when the butterfly plate is closed, so that the inlet cavity and the outlet cavity are separated. The four-valve-seat combined double-sealing fireproof device greatly improves the sealing performance of the valve in a low-temperature environment, so that the valve has bidirectional sealing performance, and when a fire disaster happens, even if the first valve seat and the second valve seat are burnt, the first metal valve seat and the second metal valve seat can still be in contact sealing with the butterfly plate, so that the fireproof effect is achieved.
Description
Technical Field
The invention relates to the technical field of ultralow-temperature valves, in particular to a maritime work ultralow-temperature combined sealing fireproof butterfly valve.
Background
The valve can be used for controlling the flow of various types of fluids such as air, water, steam, various corrosive media, slurry, oil products, liquid metal, radioactive media and the like, and mainly plays a role in cutting off and throttling on a pipeline. The butterfly valve is also called a flap valve, is a regulating valve with simple structure, and can be used for the switch control of low-pressure pipeline media. The butterfly valve opening and closing piece is a disc-shaped butterfly plate and rotates around the axis of the butterfly plate in the valve body, so that the opening and closing or adjusting purpose is achieved.
With the development of shipbuilding industry, more and more valves are widely applied to ship piping and play a very important role in the whole ship system. The Liquefied Natural Gas (LNG) ship is a special ship designed and built for transporting liquefied natural gas at an extremely low temperature of-163 ℃, and among all the current freight ships, the LNG ship is the most technically complex and difficult, and is called as the pearl on the crown of the world shipbuilding.
Therefore, there is a need for a butterfly valve suitable for a Liquefied Natural Gas (LNG) ship and capable of operating normally in an ultra-low temperature environment.
Disclosure of Invention
The combined sealing fireproof butterfly valve provided by the invention can normally work in an ultralow-temperature working environment, is suitable for more complicated working conditions compared with a conventional butterfly valve, has bidirectional sealing capability, and has very high practical value and development prospect.
In order to achieve the above object, the present invention provides a combined sealing fireproof butterfly valve, including:
the valve rod, one end of the said valve rod has bottom covers, another end of the said valve rod has actuators, the said actuator is used for controlling the shaft rotation of the said valve rod;
the valve body and the valve cover are in sealed joint with each other and sleeved on the valve rod, the valve cover is closed, the valve body is also in sealed connection with the bottom cover, and a cavity is formed in the valve body;
the butterfly plate is positioned in the cavity and is fixed to the valve rod, the valve rod and the butterfly plate divide the space into an inlet cavity and an outlet cavity, and the valve rod shaft drives the butterfly plate to rotate when rotating, so that the inlet cavity and the outlet cavity are communicated or divided;
a bottom plate, a first valve seat, a first metal valve seat, a middle plate, a second valve seat, a second metal valve seat and an upper plate are sequentially arranged between the butterfly plate and the valve body, the bottom plate and the middle plate are matched to clamp and fix the first valve seat and the first metal valve seat, and the middle plate and the upper plate are matched to clamp and fix the second valve seat and the second metal valve seat; the first valve seat, the first metal valve seat, the second valve seat and the second metal valve seat are used for contacting and sealing with the butterfly plate when the butterfly plate is closed, so that the inlet cavity and the outlet cavity are separated.
Furthermore, an annular groove is formed between the end part of the valve cover, far away from the valve body, and the valve rod, a packing gasket, a packing and a packing pressing ring are sequentially arranged in the annular groove, a packing gland is arranged at the top end of the packing pressing ring, and the packing gland, the packing pressing ring and the packing gasket are all used for fixedly pressing the packing so as to improve the sealing performance between the valve cover and the valve body.
Furthermore, the filler is of an annular structure, two ends of the filler are made of nickel wire reinforced graphite, and the middle part of the filler is made of high-purity butterfly-shaped graphite.
Furthermore, the end of the packing pad, which is far away from the packing, and the valve body are provided with a universal plug and a universal plug pad, two O-shaped rings are arranged on the outer side of the packing pressing ring, an O-shaped ring is arranged on the inner side of the packing pressing ring, and the universal plug, the packing and the O-shaped rings jointly form a triple combined sealing structure at the upper valve rod, so that micro leakage at the valve rod is greatly guaranteed.
Furthermore, the packing gland is fixed at the end part of the valve cover through a fastening piece, and a disc spring is arranged between the fastening piece and the packing gland and used for compensating the shrinkage after the packing is extruded and deformed, so that the packing is ensured to be in a compression state at all times.
Furthermore, a group of split rings are arranged between the packing gland and the packing pressing ring, so that the valve rod is prevented from blowing out in the using process, and the using safety of the valve is improved.
Furthermore, metal wave tooth composite gaskets are arranged between the bottom plate and the valve body, between the middle plate and the bottom plate and between the upper plate and the middle plate, and are used for ensuring the sealing performance requirements of all positions;
and/or metal wave tooth composite gaskets are arranged between the valve body and the valve cover and between the valve body and the bottom cover;
the metal wave tooth composite gasket is made by bonding non-asbestos non-metallic materials on the surface of a wave-shaped metal frame.
Further, the butterfly plate is designed in a hollow mode, so that the flow resistance coefficient in the liquid flowing process is reduced.
Furthermore, a top cover is arranged between the valve cover and the valve rod, and O-shaped rings are arranged on the inner side and the outer side of the top cover respectively to prevent condensed water from entering the upper part of the filler.
Furthermore, the outer sides of the first valve seat, the first metal valve seat, the second valve seat and the second metal valve seat further comprise a pressing plate, a spring retainer ring, a nut and a bolt, so that the bottom plate, the middle plate and the upper plate can be effectively pressed, and the capability of bidirectional sealing and fire burning prevention is achieved.
The invention has the following advantages:
according to the invention, the bottom plate, the first valve seat, the first metal valve seat, the middle plate, the second valve seat, the second metal valve seat and the upper plate are sequentially arranged between the butterfly plate and the valve body, so that a four-valve-seat combined double-sealing fireproof arrangement is formed, the sealing performance of the valve in a low-temperature environment is greatly improved, the valve has a bidirectional sealing performance, and meanwhile, when a fire disaster occurs, even if the first valve seat and the second valve seat are burnt, the first metal valve seat and the second metal valve seat can still be in contact sealing with the butterfly plate, so that a fireproof effect is achieved.
According to the invention, the filler pad, the filler and the filler pressing ring are sequentially filled at the joint of the valve cover and the valve rod, the O-shaped rings are arranged on the inner side and the outer side of the filler pressing ring, the universal plug is arranged below the filler pad, and the universal plug, the filler and the O-shaped rings jointly form a triple combined sealing structure at the upper valve rod, so that the micro leakage at the valve rod is greatly ensured, the micro leakage grade is low, and the dissipation order of magnitude reaches 10 -7 。
Drawings
FIG. 1 is a schematic view of a combined sealing fireproof butterfly valve according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a four-seat combined sealing fireproof design in the combined sealing fireproof butterfly valve according to an embodiment of the present invention;
FIG. 3 is a schematic diagram illustrating the compression of four valve seats in a combined sealing fireproof butterfly valve according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a sealing gasket at the joint of a valve cover and a valve body in the combined sealing fireproof butterfly valve provided by the embodiment of the invention;
FIG. 5 is a schematic view of a sealing gasket at a bottom cover of the combined sealing fireproof butterfly valve according to an embodiment of the present invention;
fig. 6 is a schematic view of a triple combined seal design at a packing pressing ring in the combined seal fireproof butterfly valve according to an embodiment of the present invention;
fig. 7 is a schematic view of a triple seal flooding plug seal at a valve rod in a combined seal fireproof butterfly valve provided by an embodiment of the invention.
Fig. 8 is a schematic view of a valve cover at a valve rod in a combined sealing fireproof butterfly valve provided by an embodiment of the invention.
Detailed Description
The invention is described in further detail below with reference to the figures and specific examples. Advantages and features of the present invention will become apparent from the following description and from the claims. It is to be noted that the drawings are in a very simplified form and are all used in a non-precise ratio for the purpose of facilitating and distinctly aiding in the description of the embodiments of the invention.
The combined sealing fireproof butterfly valve provided by the invention is further described in detail in the following with reference to the attached drawings 1-8 and the detailed description. The advantages and features of the present invention will become more apparent from the following description. It is to be noted that the drawings are in a very simplified form and are all used in a non-precise scale for the purpose of facilitating and distinctly aiding in the description of the embodiments of the present invention. To make the objects, features and advantages of the present invention comprehensible, reference is made to the accompanying drawings. It should be understood that the structures, ratios, sizes, and the like shown in the drawings and described in the specification are only used for matching with the disclosure of the specification, so as to be understood and read by those skilled in the art, and are not used to limit the implementation conditions of the present invention, so that the present invention has no technical significance, and any structural modification, ratio relationship change or size adjustment should still fall within the scope of the present invention without affecting the efficacy and the achievable purpose of the present invention.
It should be noted that, in this document, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrases "comprising one of 8230; \8230;" 8230; "does not exclude the presence of additional like elements in a process, method, article, or apparatus that comprises the element.
As shown in fig. 1, the present invention provides a combined sealing fireproof butterfly valve, which comprises: the valve comprises a valve rod 3, an actuator 24, a bottom cover 5, a valve cover 4, a valve body 1 and a butterfly plate 2. The first end of the valve rod 3 adopts a key groove structure and can be electrically connected with an actuator 24 and a worm gear, and the actuator 24 controls the shaft of the valve rod 3 to rotate through the worm gear. The opening and closing of the butterfly valve 2 are controlled by the worm gear, so that the large-caliber butterfly valve can be opened and closed easily. The end face of the second end of the valve rod 3 is provided with a bottom cover 5, and the bottom cover 5 is used for providing a fulcrum for the shaft rotation of the valve rod 3. A valve cover 4 and a valve body 1 which are jointed and sealed with each other are sleeved on the valve rod 3 between the actuator 24 and the bottom cover 5, the valve cover 4 is closed, the valve body 1 is also fixedly connected with the bottom cover 5 in a sealing way, and a cavity is arranged in the valve body 1. The butterfly valve 2 is arranged on the part, located in the cavity, of the valve rod 3, the cavity is divided into an inlet cavity and an outlet cavity through the valve rod 3 and the butterfly plate 2, the valve rod 3 rotates axially to drive the butterfly plate 2 to rotate, and the inlet cavity and the outlet cavity can be communicated or separated.
Continuing to refer to fig. 1, the butterfly plate 2 is sleeved on the valve rod 3 and fixed with the butterfly plate 2 through a locking pin 13. Specifically, the butterfly plate 2 is located on one side of the valve rod 3, and the locking pin 13 penetrates through the butterfly plate 2 and extends to the other side of the valve rod 3. The butterfly plate 2 is designed in a hollow mode, so that the flow resistance coefficient in the liquid flowing process is greatly reduced, and the flow is increased.
As shown in fig. 2-3, a bottom plate 8, a first valve seat 47, a first metal valve seat 58, an intermediate plate 9, a second valve seat 46, a second metal valve seat 59, and an upper plate 10 are sequentially disposed between the butterfly plate 2 and the valve body 1, the bottom plate 8 and the intermediate plate 9 cooperate to clamp and fix the first valve seat 47 and the first metal valve seat 58, and the intermediate plate 9 and the upper plate 10 cooperate to clamp and fix the second valve seat 46 and the second metal valve seat 59. Specifically, the bottom plate 8 and the middle plate 10 both have grooves, the bottom plate 8 presses on the valve body 1, the first valve seat 47 is placed at the groove of the bottom plate 8, the first metal valve seat 58 presses on the first valve seat 47, the middle plate 9 presses on the first metal valve seat 58, the second metal valve seat 59 is placed at the groove of the middle plate 9, the second valve seat 46 presses on the second metal valve seat 59, and the upper plate 10 presses on the second valve seat 46. The first valve seat 47, the first metal valve seat 58, the second valve seat 46 and the second metal valve seat 59 are used for contacting and sealing with the butterfly plate 2 when the butterfly plate 2 is closed, so that the inlet cavity and the outlet cavity are separated. The four-valve-seat double-sealing arrangement is adopted, so that the sealing performance of the valve in a low-temperature environment is greatly improved, and the valve has bidirectional sealing performance. Meanwhile, even if the first valve seat 47 and the second valve seat 46 are burnt in case of fire, the first metal valve seat 58 and the second metal valve seat 59 can still contact and seal with the butterfly plate 2, thereby playing a role of fire prevention. The bottom plate 8 and the middle plate 9 are provided with grooves, so that the double valve seats are uniformly stressed in the pressing process, and the sealing performance is improved.
The outer side of the upper plate 10 is further provided with a pressure plate 11, as shown in fig. 3, the pressure plate 11 is pressed on the upper plate 10 and fixed by bolts and nuts, and a spring retainer ring 12 is further arranged between the pressure plate 11 and the valve body 1. The pressing plate 11, the spring retainer ring 12, the nut and the bolt jointly form a pressing device, can effectively press the bottom plate 8, the middle plate 9 and the upper plate 10, and has the capability of bidirectional sealing and fire burning prevention.
And a metal corrugated tooth composite gasket is arranged between the bottom plate 8 and the valve body 1, between the middle plate 9 and the bottom plate 8 and between the upper plate 10 and the middle plate 9, so that the sealing performance requirements of all places are met. The metal corrugated tooth composite gasket 14 is formed by bonding flexible graphite or polytetrafluoroethylene and other non-asbestos non-metallic materials on the lower surface of a special corrugated metal frame, and has better resilience compensation performance and lower pre-tightening load. In addition, as shown in fig. 4-5, a metal corrugated composite gasket 14 is disposed between the valve body 1 and the valve cover 4 and between the valve body 1 and the bottom cover 5, so as to improve the sealing performance between the valve body 1 and the valve cover 4 and the bottom cover 5.
As shown in fig. 6, the valve cover 4 is a hollow structure, one end of the valve cover 4, which is far away from the valve body 1, extends outward to form a recess, so that an annular groove is formed between the end of the valve cover and the valve rod, a packing pad 15, a packing 16 and a packing pressing ring 17 are sequentially arranged in the annular groove, a packing gland 19 is arranged at the top end of the packing pressing ring 17, and the packing gland 19, the packing pressing ring 17 and the packing pad 15 are all used for fixedly pressing the packing 16. The packing 16 is of an annular structure, nickel wire reinforced graphite with special structures is adopted at two ends of the packing 16, the packing has excellent scratch resistance and a scale scraping and cleaning function, and the middle part of the packing adopts high-purity butterfly-shaped graphite, so that the efficient sealing characteristic can be achieved under a low-pre-condition, and the sealing performance of the packing of the valve is fully ensured.
As shown in fig. 7, a flooding plug 60 and a flooding plug 61 are arranged below the packing gasket 15, two O-ring grooves are arranged on the outer side of the packing pressing ring 17, one O-ring groove is arranged on the inner side of the packing pressing ring, and one O-ring 45 is respectively arranged in each of the three O-ring grooves, so that the sealing performance can be fully ensured, and the leakage of the valve can be avoided. The flooding plug 60, the packing 16 and the O-shaped ring 45 form a triple combined sealing structure at the upper valve rod, so that micro leakage at the valve rod is greatly ensured, the micro leakage level is low, and the dissipation order of magnitude reaches 10 -7 。
The packing gland 19 is fixed at the end part of the valve cover 4 through a fastener, and a disc spring 54 is arranged between the fastener and the packing gland 19 and used for compensating the shrinkage after the packing is extruded and deformed, so that the problems of loosening and leakage of the packing caused by long-time compression and temperature influence are avoided, the packing 16 is fully ensured to be in a compression state all the time, and the sealing performance is ensured. A group of split rings 18 are arranged between the packing gland 19 and the packing pressing ring 17 to jointly form a blowout prevention device, so that the valve rod 3 is prevented from blowing out in the using process, the use safety of the valve is improved, the uniform stress of the packing gland 19 and the uniform stress of the packing 16 can be fully ensured, and the sealing performance is ensured.
As shown in fig. 8, valve gap 4 passes through fastener and executor 24 fixed connection, just still be equipped with a top cap 52 between valve gap 4 and the valve rod 3, the inside and outside of top cap 52 sets up O type circle 45 respectively, can avoid the comdenstion water to get into the worm gear and arouse to rust on the one hand, and on the other hand can prevent that the comdenstion water from getting into the upper portion of packing, has avoided the damage of packing, has greatly improved the performance and the life-span of valve, and the clamp plate that packs simultaneously also possesses the circular characteristics of conveniently processing, the cost is reduced. Two bearing sleeves 23 are respectively arranged at the joints of the two ends of the valve body 1 and the valve rod 3 so as to reduce the frictional resistance of the valve in the opening and closing process and play a role in supporting and guiding the valve rod 3.
The four-valve-seat combined double-sealing fireproof device is adopted, so that the sealing performance of the valve in a low-temperature environment is greatly improved, and the valve has bidirectional sealing performance; meanwhile, when a fire occurs, the first and second valve seats 47 and 46 are burned, and the second valve seatA metal valve seat 58 and a second metal valve seat 59 can still be in contact with the butterfly plate 2 for sealing, and the fireproof effect is achieved. Moreover, the joint of the valve cover and the valve rod is sequentially filled with the packing pad 15, the packing 16 and the packing pressing ring 17, the O-shaped rings 45 are arranged on the inner side and the outer side of the packing pressing ring 17, the flooding plug 60 is arranged below the packing pad, and the flooding plug 60, the packing 16 and the O-shaped rings 45 jointly form a triple combined sealing structure at the upper valve rod, so that micro leakage at the valve rod is greatly ensured, the micro leakage grade is low, and the loss order of magnitude reaches 10 -7 . In addition, the butterfly plate 2 is designed in a hollow mode, so that the flow resistance coefficient in the liquid flowing process is greatly reduced, and the flow rate is increased.
While the present invention has been described in detail with reference to the preferred embodiments, it should be understood that the above description should not be taken as limiting the invention. Various modifications and alterations to this invention will become apparent to those skilled in the art upon reading the foregoing description. Accordingly, the scope of the invention should be determined from the following claims.
Claims (10)
1. The utility model provides a combination sealing fire prevention butterfly valve which characterized in that includes:
the valve rod, one end of the said valve rod has bottom covers, another end of the said valve rod has actuators, the said actuator is used for controlling the shaft rotation of the said valve rod;
the valve body and the valve cover are in sealed joint with each other and sleeved on the valve rod, the valve cover is closed, the valve body is also in sealed connection with the bottom cover, and a cavity is formed in the valve body;
the butterfly plate is positioned in the cavity and fixed to the valve rod, the valve rod and the butterfly plate divide the space into an inlet cavity and an outlet cavity, and the valve rod shaft drives the butterfly plate to rotate when rotating, so that the inlet cavity and the outlet cavity are communicated or separated;
a bottom plate, a first valve seat, a first metal valve seat, a middle plate, a second valve seat, a second metal valve seat and an upper plate are sequentially arranged between the butterfly plate and the valve body, the bottom plate and the middle plate are matched to clamp and fix the first valve seat and the first metal valve seat, and the middle plate and the upper plate are matched to clamp and fix the second valve seat and the second metal valve seat; the first valve seat, the first metal valve seat, the second valve seat and the second metal valve seat are used for being in contact with the butterfly plate to seal when the butterfly plate is closed, so that the inlet cavity and the outlet cavity are separated.
2. The combination sealing fireproof butterfly valve according to claim 1, wherein an annular groove is formed between the end of the valve cover, which is far away from the valve body, and the valve rod, a packing gasket, a packing pressing ring are sequentially arranged in the annular groove, a packing gland is arranged at the top end of the packing pressing ring, and the packing gland, the packing pressing ring and the packing gasket are all used for fixedly pressing the packing so as to improve the sealing performance between the valve cover and the valve body.
3. The combination sealing fire-proof butterfly valve of claim 2, wherein the packing is of a ring structure, both ends of the packing are made of nickel wire reinforced graphite, and the middle part of the packing is made of high-purity butterfly graphite.
4. The combined sealing fireproof butterfly valve of claim 2, wherein a flooding plug and a flooding plug pad are arranged between one end of the packing pad, which is far away from the packing, and the valve body, two O-rings are arranged on the outer side of the packing pressing ring, and one O-ring is arranged on the inner side of the packing pressing ring, and the flooding plug, the packing and the O-rings jointly form a triple combined sealing structure at the upper valve rod, so that micro leakage at the valve rod is greatly guaranteed.
5. The combined sealing fireproof butterfly valve of claim 2, wherein the packing gland is fixed on the valve cover through a fastener, and a disc spring is arranged between the fastener and the packing gland and used for compensating the shrinkage after the packing is extruded and deformed so as to ensure that the packing is in a compression state at all times.
6. The combined sealing fireproof butterfly valve of claim 2, wherein a set of split rings is arranged between the packing gland and the packing pressing ring to ensure that the valve rod is not blown out during use, thereby improving the use safety of the valve.
7. The combined sealing fireproof butterfly valve of claim 1, wherein metal corrugated composite gaskets are arranged between the bottom plate and the valve body, between the middle plate and the bottom plate and between the upper plate and the middle plate for ensuring the sealing performance requirements of all places;
and/or metal wave tooth composite gaskets are arranged between the valve body and the valve cover and between the valve body and the bottom cover;
the metal corrugated tooth composite gasket is made by bonding non-asbestos nonmetal materials on the surface of a corrugated metal frame.
8. The combination sealed fire-resistant butterfly valve of claim 1, wherein said butterfly plate is of hollow design to reduce the coefficient of flow resistance during liquid flow.
9. The combination sealing fire-proof butterfly valve of claim 1, wherein a top cover is further arranged between the valve cover and the valve rod, and O-rings are respectively arranged on the inner side and the outer side of the top cover to prevent condensed water from entering.
10. The combined sealing fireproof butterfly valve of claim 1, wherein a pressing plate is further arranged on the outer side of the upper plate, and the pressing plate is fixed on the upper plate and can effectively press the bottom plate, the middle plate and the upper plate to achieve the capabilities of bidirectional sealing and fireproof.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211350962.0A CN115711294A (en) | 2022-10-31 | 2022-10-31 | Combined sealing fireproof butterfly valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211350962.0A CN115711294A (en) | 2022-10-31 | 2022-10-31 | Combined sealing fireproof butterfly valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115711294A true CN115711294A (en) | 2023-02-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211350962.0A Pending CN115711294A (en) | 2022-10-31 | 2022-10-31 | Combined sealing fireproof butterfly valve |
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| Country | Link |
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| CN (1) | CN115711294A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117287547A (en) * | 2023-11-24 | 2023-12-26 | 泉州威可赛机械科技有限公司 | Valve actuator capable of realizing accurate positioning of valve rod and application |
-
2022
- 2022-10-31 CN CN202211350962.0A patent/CN115711294A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117287547A (en) * | 2023-11-24 | 2023-12-26 | 泉州威可赛机械科技有限公司 | Valve actuator capable of realizing accurate positioning of valve rod and application |
| CN117287547B (en) * | 2023-11-24 | 2024-02-02 | 泉州威可赛机械科技有限公司 | Valve actuator capable of realizing accurate positioning of valve rod and application |
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Inventor after: Di Jiuwang Inventor after: Ye Dongqing Inventor after: Yang Keting Inventor after: Weng Wuxiu Inventor after: Wang Dawei Inventor after: Zou Fan Inventor before: Di Jiuwang Inventor before: Yang Keting Inventor before: Weng Wuxiu Inventor before: Wang Dawei Inventor before: Zou Fan |
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