CN210218759U - Ball valve special for coal chemical industry - Google Patents
Ball valve special for coal chemical industry Download PDFInfo
- Publication number
- CN210218759U CN210218759U CN201920788154.XU CN201920788154U CN210218759U CN 210218759 U CN210218759 U CN 210218759U CN 201920788154 U CN201920788154 U CN 201920788154U CN 210218759 U CN210218759 U CN 210218759U
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- Prior art keywords
- valve
- spherical
- flow channel
- cinder
- valve core
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- Expired - Fee Related
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- 239000003245 coal Substances 0.000 title claims abstract description 32
- 239000000126 substance Substances 0.000 title claims abstract description 13
- 239000003818 cinder Substances 0.000 claims abstract description 45
- 239000002184 metal Substances 0.000 claims abstract description 19
- 238000007789 sealing Methods 0.000 claims description 23
- 239000002893 slag Substances 0.000 claims description 18
- 238000002955 isolation Methods 0.000 claims description 14
- 238000004140 cleaning Methods 0.000 claims description 13
- 230000008676 import Effects 0.000 claims description 11
- 238000002347 injection Methods 0.000 claims description 5
- 239000007924 injection Substances 0.000 claims description 5
- 239000002245 particle Substances 0.000 claims description 5
- 230000002093 peripheral effect Effects 0.000 claims description 4
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 230000006835 compression Effects 0.000 claims description 2
- 238000007906 compression Methods 0.000 claims description 2
- 238000007599 discharging Methods 0.000 claims description 2
- 238000011010 flushing procedure Methods 0.000 claims description 2
- 238000005299 abrasion Methods 0.000 abstract description 4
- 230000006978 adaptation Effects 0.000 abstract 1
- 238000010030 laminating Methods 0.000 abstract 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 16
- 230000005484 gravity Effects 0.000 description 5
- 230000005540 biological transmission Effects 0.000 description 4
- 239000012530 fluid Substances 0.000 description 4
- 239000002351 wastewater Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000003779 hair growth Effects 0.000 description 3
- 239000012535 impurity Substances 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 238000011049 filling Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 230000003044 adaptive effect Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 239000013013 elastic material Substances 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005504 petroleum refining Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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- Details Of Valves (AREA)
Abstract
The utility model relates to a special ball valve of coal chemical industry, including spherical case, valve body, valve gap and case controller, spherical case is provided with opens and close the passageway, is provided with the runner in valve body and the valve gap, is provided with the disk seat in the runner, and the seat is provided with metal seal portion towards spherical case, and metal seal portion is provided with the isolated portion of cinder in the protrusion of runner side, and the isolated portion of cinder follows the runner axial including the first end of the spherical case of laminating, and keep away from the second end of spherical case, and follows the runner radially first end is close to runner center, second end and keeps away from the runner center, and the isolated portion of cinder lies in and is provided with the isolated face that is used for preventing the cinder from being close to spherical case between first end and the second end, opens and close the inner wall and the big or small looks adaptation of first end. By adopting the scheme, the special ball valve for the coal chemical industry is provided, so that the abrasion of the valve seat and the spherical valve core is reduced due to the fact that the coal cinder can not be clamped between the valve seat and the spherical valve core.
Description
Technical Field
The utility model relates to a ball valve, concretely relates to special ball valve of coal industry.
Background
A ball valve is a valve in which an opening and closing member (ball) is driven by a valve rod and rotates around the axis of the ball valve. The ball valve is applied to industries such as petroleum refining, long-distance pipelines, paper making, electric power, water conservancy and the like because of small flow resistance.
The ball valve used for coal transportation in the market comprises a spherical valve core, a valve body, a valve cover and a spherical valve core controller, wherein the spherical valve core is arranged between the valve cover and the valve body, an opening and closing channel is arranged along the center in a penetrating mode, the valve cover and the valve body are designed in a sealing fit mode, a flow channel which is closed or opened by the spherical valve core is arranged in the valve body and the valve cover, a valve seat which is in sealing fit with the spherical valve core is arranged in the flow channel, the spherical valve core controller is arranged in a linkage mode with the spherical valve core and comprises a driving device for rotating the spherical valve core and a valve rod for connecting the driving device with the spherical valve core, the opening and closing channel on the spherical valve core can be communicated or separated with the flow channel through the driving device, and therefore the flow channel is closed and communicated, and the flow channel plays.
In addition, in the open state, the circumferential radius of the open-close channel is the same as that of the flow channel, and the valve seat is generally made of a rubber valve seat, so that when the flow channel is in the closed state, as shown in fig. 1, an angle a is formed by a tangent line of the inner peripheral wall of the flow channel along the flow channel direction relative to a tangent line of a contact position of the spherical valve core and the valve seat, and the angle a is smaller than 90 degrees, so that when the flow channel is in the closed state, the cinder particles are easily clamped in the angle a, and the rubber valve seat and the spherical valve core are abraded in the opening process of the flow channel, so that the sealing performance is damaged, and the durability is reduced.
Disclosure of Invention
The utility model aims to provide a not enough to prior art exists, thereby the unable card of cinder reduces the special ball valve of coal industry of disk seat and spherical case wearing and tearing between disk seat and the spherical case is located.
In order to achieve the above purpose, the utility model provides a following technical scheme: the spherical valve core is arranged between the valve body and the valve cover, an opening and closing channel penetrates through the center of the spherical valve core, a flow channel which is closed or opened by the spherical valve core is arranged in the valve body and the valve cover, a valve seat which is in sealing fit with the spherical valve core is arranged in the flow channel, the valve core controller is in linkage with the spherical valve core, the spherical valve core controller comprises a driving device for rotating the spherical valve core and a valve rod for connecting the driving device and the spherical valve core, the valve seat is provided with a metal sealing part which is in fit with the spherical valve core and is sealed with the spherical valve core towards the spherical valve core, the metal sealing part is convexly arranged on the side of the flow channel and is provided with a cinder isolating part, the cinder isolating part comprises a first end which is in fit with the spherical valve core and a second end which is far away from the spherical valve core along the axial direction of the flow channel, the first end is close to the center of the flow The inner wall of the opening and closing channel is matched with the shape and the size of the first end, and the inner wall of the flow channel is matched with the shape and the size of the second end.
By adopting the technical scheme 1, as the transmission medium for coalification work contains more solid particles such as coal slag and the like, the valve seat made of rubber and the like is greatly abraded, and the metal sealing part and the spherical valve core are adopted for sealing, so that the abrasion resistance of the equipment is greatly improved and the service life is prolonged by utilizing the abrasion resistance of metal; 2. the arrangement of the cinder isolating part utilizes the slope isolating surface formed by the first end and the second end to ensure that cinder can roll down along the isolating surface and is far away from the spherical valve core under the action of self gravity when the cinder is close to the spherical valve core, thereby ensuring that the cinder can not be clamped between the metal sealing part and the spherical valve core; 3. the shape and size of the first end are the same as those of the opening and closing channel, and the shape and size of the second end are the same as those of the flow channel, so that under the condition that the flow channel is opened, the stress balance of the coal cinder can be damaged in the transmission process due to the gradient of the isolation surface of the coal cinder, the coal cinder is extremely difficult to clamp between the valve seat and the spherical valve core, the probability of abrasion is reduced, and the service life is prolonged.
The utility model discloses further set up to: the arc is personally submitted in isolated, just curved isolated face is provided with the opening, and the opening deviates from metal isolated portion.
By adopting the technical scheme, 1, the isolation surface is arranged in an arc shape, so that the coal cinder is more stable in the transmission process; 2. the arc opening deviates from the metal isolation part, so that the cinder transmission between the cinder isolation part and the valve seat is stable, and the cinder instability between the cinder isolation part and the spherical valve core is more serious, so that the clamping cannot be realized.
The utility model discloses further set up to: the valve body is positioned in the flow channel and is provided with an adjusting track for the valve seat to slide along the flow channel direction, the valve seat is arranged on the adjusting track in a sliding mode, sealing pieces are arranged on two sides of the valve seat in the flow channel direction respectively, each sealing piece is clamped between the valve seat and the valve body, a spring is arranged between the valve body and the valve seat and is in a compression state, and the elastic direction of the spring is the same as the direction of the adjusting track.
Through adopting above-mentioned technical scheme, the adjustment track has realized that the cooperation of disk seat in the runner orientation is relieved to make the disk seat adjust by oneself according to actual conditions under the effect of spring, thereby effective extrusion sets up in spherical case, makes sealed effect more, and the setting of sealing member prevents that the fluid medium from flowing in the runner in addition, has protected the spring.
The utility model discloses further set up to: an elastic isolation plate used for isolating coal cinder particles from entering the space between the valve seat and the valve body is arranged on one side, away from the valve rod, of the valve seat in the flow channel along the flow channel direction, and mounting grooves are formed in the two sides, located on the elastic isolation plate, of the valve seat and the valve body respectively.
Through adopting above-mentioned technical scheme, because the demand that manufacturing accuracy and disk seat need slide, consequently there is certain clearance between disk seat and the valve body, consequently at the medium flow process, this clearance is very easily located to the cinder granule card for the automatically regulated temperature nature of disk seat reduces, and the setting of elasticity isolating plate makes the cover establish the one deck and prevents the baffle in cinder medium entering clearance between disk seat and valve body, and because the baffle is made for the elastic material, consequently also provides the pretightning force for the disk seat effective action ball valve core.
The utility model discloses further set up to: the ball-shaped valve core is positioned between the second flow channel and the opening and closing channel and is communicated with a jet hole used for flushing the opening and closing channel and the flow channel.
By adopting the technical scheme, because the medium with the coal cinder is transmitted for a long time, a large amount of coal cinder is remained in the flow channel, and the arrangement of the cleaning water tank cleans the coal cinder in the flow channel and the opening and closing channel by spraying cleaning water through the first flow channel and the second flow channel and the jet holes, so that the direct cleaning function is realized, and the disassembly and the cleaning are not needed.
The utility model discloses further set up to: the spherical valve core comprises an upper half valve core close to the valve rod and a lower half valve core far away from the valve rod along the axial direction of the valve rod, and the injection hole is formed in the lower half valve core.
Through adopting above-mentioned technical scheme, only set up the jet orifice on the case of leaving office, the jet orifice blowout on the case of accessible second half washs water and washes first half case and the impurity of runner first half section, later under the action of gravity, washs water and can follow the lateral wall and leave and wash the impurity of second half section, and the function that has utilized water has greatly been saved the water resource.
The utility model discloses further set up to: the valve body is positioned on the side, away from the valve rod, of the spherical valve core, a slag hole for discharging cleaning residues is arranged in a penetrating mode, an opening and closing piece for opening and closing the slag hole is arranged in the slag hole, and the opening and closing piece is in threaded fit with the valve body.
Through adopting above-mentioned technical scheme, the setting up of slagging tap makes waste water and cinder accessible after the washing flow out of slagging tap, has improved the function of excreteing the waste material to open and close the slagging tap hole through the closure, prevent the interference of the existence of slagging tap hole to the normal work of runner.
The utility model discloses further set up to: the hole of slagging tap is located the runner side and is provided with the import of slagging tap, the valve body is located the peripheral inner wall of the import of slagging tap and risees along with keeping away from the distance of the import of slagging tap and horizontal position gradually.
Through adopting above-mentioned technical scheme, the peripheral horizontal position of the import of slagging tap risees along with keeping away from the import of slagging tap, consequently the import of slagging tap is in the horizontal position least significant end for waste water and cinder assemble towards the import of slagging tap under the effect of self gravity, thereby improved the efficiency of slagging tap.
The invention is further described with reference to the accompanying drawings and the detailed description.
Drawings
FIG. 1 is a partial cross-sectional view of a prior art ball valve;
FIG. 2 is a cross-sectional view of an embodiment of the present invention;
FIG. 3 is the hair growth diagram B of FIG. 2;
FIG. 4 is the hair growth diagram of C in FIG. 2;
fig. 5 is a hair growth diagram D in fig. 2.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings.
As shown in fig. 2, the utility model discloses a special ball valve for coal chemical industry, which comprises a valve body 1, a valve cover 2, a spherical valve core 3 and a valve core controller 4, wherein the spherical valve core 3 is arranged between the valve body 1 and the valve cover 2, and the valve body 1 and the valve cover 2 are fixedly connected through bolts to realize the loading of the spherical valve core 3, wherein the spherical valve core 3 is provided with an opening and closing channel 31 along the center, the opening and closing channel 31 is in a cylindrical hollow groove shape, a flow passage 11 which is closed or opened by the spherical valve core 3 is arranged in the valve body 1 and the valve cover 2, when the opening and closing channel 31 is communicated with the flow passage 11, the valve is in an opening state, when the opening and closing channel 31 is isolated from the flow passage 11, the valve is in a closing state, in addition, the flow passage 11 is provided with valve seats 5 which are positioned at both sides of the, in addition, the valve core controller 4 includes a driving device 41 and a valve rod 42, the upper end of the valve rod 42 is connected to the driving device 41, and the lower end is fixedly connected to the spherical valve core 3 through a thread, so that the valve rod 42 can be driven by the driving device 41 to rotate, thereby determining whether the opening and closing channel 31 is communicated with the flow channel 11.
The driving device 41 in this embodiment may be a motor, a rotating handle, or the like.
In addition, in the embodiment, a cleaning water tank 6 is provided at the upper end of the valve body 1, a water filling port 6161 for filling cleaning water is provided at the upper end of the cleaning water tank 6, the lower end is connected with the valve rod 42, a first flow passage 42111 communicated with the cleaning water tank 6 is provided in the valve rod 42, a second flow passage 3211 communicated with the first flow passage 42111 and an injection hole 33 communicated with the second flow passage 3211 and the open-close passage 31 are provided in the ball valve core 3. Therefore, the cleaning water can act on the opening and closing channel 31 and the flow channel 11 through the cleaning water tank 6, the first flow channel 42111, the second flow channel 3211 and the injection hole 33 to wash away the coal cinder.
Preferably, the ball valve core 3 in this embodiment includes an upper half valve core 34 close to the stem 42 and a lower half valve core 35 far from the stem 42 along the axial direction of the stem 42, and the injection hole 33 is provided in the lower half valve core 35. Therefore, the cleaning water in the jet hole 33 of the lower half valve core 35 washes the upper half area of the upper half valve core 34 and the flow channel 11, and washes the lower half area of the lower half valve core 35 and the flow channel 11 along the action of gravity, thereby greatly improving the use benefit of water.
Preferably, the valve body 1 in this embodiment is provided with a slag hole 12 at the lower end of the spherical valve core 3, and an opening and closing member 13 for opening and closing the slag hole 12 is provided in the slag hole 12, and the opening and closing member 13 is in threaded fit with the valve body 1. Therefore, the slag hole 12 provides a discharge channel for the wastewater and the coal slag, and the opening and closing member 13 determines the opening and closing of the slag hole 12, thereby preventing the normal operation of the runner 11 from being affected by the slag hole 12.
Preferably, the slag hole 12 of the present embodiment is provided with a slag inlet 121 at the side of the runner 11, and the inner wall of the valve body 1 at the periphery of the slag inlet 121 gradually increases in horizontal position with the distance from the slag inlet 121. Therefore, waste water and cinder can be gathered to the import 121 of slagging tap under the action of gravity, improve impurity removal efficiency.
As shown in fig. 2-4, the valve seats 5 in the present embodiment are two sets, wherein one set of the valve seats 5 is integrally formed with the bonnet 2, and the other set of the valve seats 5 is disposed between the valve body 1 and the ball valve core 3.
In this embodiment, each valve seat 5 is provided with a metal sealing portion 51 which is attached to and sealed with the spherical valve element 3 toward the spherical valve element 3, the metal sealing portion 51 is provided with a cinder isolating portion 52 which is protruded and integrally formed on the side of the flow passage 11, the cinder isolating portion 52 includes a first end 521 attached to the spherical valve element 3 and a second end 522 far away from the spherical valve element 3 along the axial direction of the flow passage 11, the first end 521 is close to the center of the flow passage 11 along the radial direction of the flow passage 11, the second end 522 is far away from the center of the flow passage 11, an isolating surface 523 for preventing cinder from being close to the spherical valve element 3 is provided between the first end 521 and the second end 522 of the cinder isolating portion 52, the inner wall of the opening and closing passage 31 and the first end 521 have circular adaptive cross sections, and the inner wall of the flow passage 11 and. Therefore, the wear resistance is greatly improved by the metal characteristic of the metal sealing part 51, and the cinder is prevented from approaching the ball valve core 3 by the isolating surface 523 formed by the first end 521 and the second end 522, so that the clamping is prevented.
Preferably, the isolating surface 523 in this embodiment is arc-shaped, and the arc-shaped isolating surface 523 is provided with an opening 5231, and the opening 5231 faces away from the metal isolating part. Therefore, the fluid medium flows smoothly better through the arc-shaped isolation surface 523, and the coal cinder is stressed unstably at the intersection of the spherical valve core 3 and the metal sealing surface, so that the coal cinder is not easy to clamp between the gaps.
In addition, in the valve body 1 in this embodiment, an adjusting rail 14 for allowing the valve seat 5 corresponding to the valve body 1 to slide along the direction of the flow passage 11 is provided in the flow passage 11, the valve seat 5 is slidably provided in the adjusting rail 14, sealing members 53 are respectively provided on both sides of the valve seat 5 in the direction of the flow passage 11, each sealing member 53 is clamped between the valve seat 5 and the valve body 1, a spring 54 is provided between the valve body 1 and the valve seat 5, the spring 54 is in a compressed state, and the direction of the elastic force is the same as the direction of the adjusting rail 14. Thus, the squeezing action of the metal seal 51 against the ball valve element 3 can be dynamically adjusted by the spring 54 acting on the valve seat 5, making the seal more effective, and the seal 53 effectively prevents corrosion or other chemical action of the fluid medium against the spring 54.
As shown in fig. 2 and fig. 4 to fig. 5, in the flow channel 11 of the present embodiment, an elastic isolation plate for isolating the cinder particles from entering between the valve seat 5 and the valve body 1 is disposed on one side of the valve seat 5 away from the valve rod 42 along the direction of the flow channel 11, and mounting grooves 71 are respectively disposed on two sides of the elastic isolation plate of the valve seat 5 and the valve body 1. Therefore, the elastic isolation plate is installed in the installation groove 71 to isolate the coal cinder in the fluid medium from entering the gap between the valve body 1 and the valve seat 5, so as to prevent blockage, and the elastic isolation plate has elastic function, so that the auxiliary spring 54 can better perform dynamic sealing.
Claims (8)
1. The utility model provides a special ball valve of coal industry, includes spherical case, valve body, valve gap and case controller, and spherical case is installed between valve body and valve gap to run through along the center and be provided with and open and close the passageway, be provided with the runner that seals or open by spherical case in valve body and the valve gap, be provided with in the runner with the sealed complex disk seat of spherical case, case controller and spherical case linkage set up, its drive arrangement including rotating spherical case and the valve rod of connecting drive arrangement and spherical case, its characterized in that: the valve seat is provided with a metal sealing part which is attached and sealed with the spherical valve core towards the spherical valve core, the metal sealing part is arranged on the side of the flow channel in a protruding mode and is provided with a cinder isolating part, the cinder isolating part comprises a first end attached to the spherical valve core and a second end far away from the spherical valve core along the axial direction of the flow channel, the first end is close to the center of the flow channel, the second end is far away from the center of the flow channel along the radial direction of the flow channel, an isolating surface used for preventing cinder from being close to the spherical valve core is arranged between the first end and the second end of the cinder isolating part, the inner wall of the opening and closing channel is matched with the shape and the size of the first end.
2. The special ball valve for coal chemical industry according to claim 1, characterized in that: the arc is personally submitted in isolated, just curved isolated face is provided with the opening, and the opening deviates from metal isolated portion.
3. The special ball valve for coal chemical industry according to claim 1, characterized in that: the valve body is positioned in the flow channel and is provided with an adjusting track for the valve seat to slide along the flow channel direction, the valve seat is arranged on the adjusting track in a sliding mode, sealing pieces are arranged on two sides of the valve seat in the flow channel direction respectively, each sealing piece is clamped between the valve seat and the valve body, a spring is arranged between the valve body and the valve seat and is in a compression state, and the elastic direction of the spring is the same as the direction of the adjusting track.
4. The special ball valve for coal chemical industry according to claim 3, characterized in that: an elastic isolation plate used for isolating coal cinder particles from entering the space between the valve seat and the valve body is arranged on one side, away from the valve rod, of the valve seat in the flow channel along the flow channel direction, and mounting grooves are formed in the two sides, located on the elastic isolation plate, of the valve seat and the valve body respectively.
5. The special ball valve for coal chemical industry according to claim 1, characterized in that: the ball-shaped valve core is positioned between the second flow channel and the opening and closing channel and is communicated with a jet hole used for flushing the opening and closing channel and the flow channel.
6. The special ball valve for coal chemical industry according to claim 5, characterized in that: the spherical valve core comprises an upper half valve core close to the valve rod and a lower half valve core far away from the valve rod along the axial direction of the valve rod, and the injection hole is formed in the lower half valve core.
7. The special ball valve for coal chemical industry according to claim 5, characterized in that: the valve body is positioned on the side, away from the valve rod, of the spherical valve core, a slag hole for discharging cleaning residues is arranged in a penetrating mode, an opening and closing piece for opening and closing the slag hole is arranged in the slag hole, and the opening and closing piece is in threaded fit with the valve body.
8. The special ball valve for coal chemical industry according to claim 7, characterized in that: the hole of slagging tap is located the runner side and is provided with the import of slagging tap, the valve body is located the peripheral inner wall of the import of slagging tap and risees along with keeping away from the distance of the import of slagging tap and horizontal position gradually.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920788154.XU CN210218759U (en) | 2019-05-29 | 2019-05-29 | Ball valve special for coal chemical industry |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920788154.XU CN210218759U (en) | 2019-05-29 | 2019-05-29 | Ball valve special for coal chemical industry |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210218759U true CN210218759U (en) | 2020-03-31 |
Family
ID=69928344
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920788154.XU Expired - Fee Related CN210218759U (en) | 2019-05-29 | 2019-05-29 | Ball valve special for coal chemical industry |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210218759U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116906615A (en) * | 2023-09-13 | 2023-10-20 | 华英阀业有限公司 | Ball valve support and ultralow temperature ball valve thereof |
-
2019
- 2019-05-29 CN CN201920788154.XU patent/CN210218759U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116906615A (en) * | 2023-09-13 | 2023-10-20 | 华英阀业有限公司 | Ball valve support and ultralow temperature ball valve thereof |
| CN116906615B (en) * | 2023-09-13 | 2023-12-01 | 华英阀业有限公司 | Ball valve support and ultralow temperature ball valve thereof |
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|---|---|---|---|
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| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20200331 |
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| CF01 | Termination of patent right due to non-payment of annual fee |