CN111379923A - Water hammer eliminating and pressure reducing device for protecting valve - Google Patents
Water hammer eliminating and pressure reducing device for protecting valve Download PDFInfo
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- CN111379923A CN111379923A CN202010336854.2A CN202010336854A CN111379923A CN 111379923 A CN111379923 A CN 111379923A CN 202010336854 A CN202010336854 A CN 202010336854A CN 111379923 A CN111379923 A CN 111379923A
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- compression chamber
- water
- connecting pipe
- valve
- water hammer
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 76
- 230000006835 compression Effects 0.000 claims abstract description 51
- 238000007906 compression Methods 0.000 claims abstract description 51
- 238000007789 sealing Methods 0.000 claims abstract description 3
- 230000000903 blocking effect Effects 0.000 claims description 18
- 230000006837 decompression Effects 0.000 claims description 10
- 230000009471 action Effects 0.000 claims description 6
- 239000003302 ferromagnetic material Substances 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 230000009467 reduction Effects 0.000 abstract description 2
- 230000005291 magnetic effect Effects 0.000 description 5
- 238000007599 discharging Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000035939 shock Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000001066 destructive effect Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000002209 hydrophobic effect Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
- F16L55/04—Devices damping pulsations or vibrations in fluids
- F16L55/045—Devices damping pulsations or vibrations in fluids specially adapted to prevent or minimise the effects of water hammer
- F16L55/05—Buffers therefor
- F16L55/052—Pneumatic reservoirs
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/004—Actuating devices; Operating means; Releasing devices actuated by piezoelectric means
- F16K31/007—Piezoelectric stacks
- F16K31/008—Piezoelectric stacks for sliding valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
- F16L55/04—Devices damping pulsations or vibrations in fluids
- F16L55/045—Devices damping pulsations or vibrations in fluids specially adapted to prevent or minimise the effects of water hammer
- F16L55/055—Valves therefor
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Details Of Valves (AREA)
- Pipe Accessories (AREA)
Abstract
The invention discloses a water hammer eliminating and pressure reducing device for a protection valve, which comprises a first connecting pipe, a device body and a second connecting pipe which are sequentially arranged from left to right. Has the advantages that: according to the invention, on one hand, under the first straight surface, the first inclined surface, the second straight surface, the second inclined surface and the third straight surface with the width increasing gradually, according to the Bernoulli principle, the width is increased gradually, and the water pressure is reduced gradually, on the other hand, water flow continuously extrudes the plurality of piston plates and compresses the second spring, so that air in the first compression cavity and the second compression cavity is pressed into the first flow-resisting bag and the second flow-resisting bag through the first communicating pipe and the second communicating pipe respectively, the first flow-resisting bag and the second flow-resisting bag in the plurality of acting pieces form flow-resisting surfaces for sealing the water through port, the impact on the valve is avoided, and due to the compressibility of the air, the third compression cavity further plays a role in pressure reduction, so that the water hammer is thoroughly eliminated, the structure is simple, and the manufacturing cost is low.
Description
Technical Field
The invention relates to the technical field of valves, in particular to a water hammer eliminating and pressure reducing device for protecting a valve.
Background
The water hammer is called a water hammer because the water hammer generates water flow shock waves like a hammer is knocked when a power failure suddenly occurs or when a valve is closed too fast due to the inertia of pressure water flow. The force generated by the water flow shock wave back and forth is sometimes very large, thus damaging the valve and the water pump.
When the electric water pump is started at full voltage, the speed can be accelerated to the rated speed from a static state in less than 1s, and the flow in the pipeline is increased from zero to the rated flow. Because of the momentum and degree of compressibility of the fluid, a sharp change in flow will cause either too high or too low a pressure impact within the pipe and the appearance of "cavitation". The impact of the pressure will force the pipe wall to make noise as if a hammer were hitting the pipe, known as the "water hammer effect".
The instantaneous pressure of the water hammer greatly exceeds the normal pressure and often produces destructive influence, so that the pipeline system generates strong vibration or noise, a valve joint can be damaged, and the pipeline system is greatly damaged. At present, most of pipeline systems can select to install the water hammer eliminator to eliminate or lighten the water hammer effect, and most of the existing water hammer eliminators are complex in structure and high in manufacturing cost.
In order to solve the problems, a water hammer eliminating and pressure reducing device for protecting a valve is provided.
Disclosure of Invention
The invention aims to solve the problems in the background art and provides a water hammer eliminating and pressure reducing device for protecting a valve.
In order to achieve the purpose, the invention adopts the following technical scheme: a water hammer eliminating and pressure reducing device for protecting a valve comprises a first connecting pipe, a device body and a second connecting pipe which are sequentially arranged from left to right, wherein a water passage opening with the same inner diameter as the first connecting pipe and the second connecting pipe is formed in the device body, two ends of the water passage opening are respectively detachably, hermetically and fixedly connected with the first connecting pipe and the second connecting pipe, the second connecting pipe is provided with the valve, and a plurality of action pieces are uniformly arranged in the device body in the circumferential direction by taking the water passage opening as a circle center; the action piece comprises a chute arranged on the inner wall of the water port, a plugging plate is connected in the chute in a sliding manner, permanent magnets and electromagnetic blocks are fixedly arranged on the corresponding positions of the plugging plate and the inner wall of the chute respectively, the permanent magnets and the electromagnetic blocks are attracted, and one sides of the permanent magnets, which are opposite to the electromagnetic blocks, are fixedly connected with a first spring together; the action part also comprises a discharge passage which is arranged in the device body and corresponds to the position of the plugging plate, the discharge passage is obliquely arranged, one end of the discharge passage, which is far away from the plugging plate, is provided with a decompression chamber with continuously increased width, the decompression chamber is internally provided with a first straight surface, a first inclined surface, a second straight surface, a second inclined surface and a third straight surface from left to right in sequence, the first straight surface, the second straight surface and the third straight surface are respectively provided with a first compression chamber, a second compression chamber and a third compression chamber with different depths, the first compression chamber, the second compression chamber and the third compression chamber are respectively and hermetically and slidably connected with a piston plate, the first compression chamber, the second compression chamber and the third compression chamber are respectively and fixedly connected with a second spring, the first compression chamber and the second compression chamber are respectively communicated with a first communicating pipe and a second communicating pipe, one end of the first communicating pipe, which is far away from the first compression chamber, is communicated with a first choked flow bag, and one end of the second communicating pipe, which is far away from the second compression chamber, is communicated with a second choke bag.
In the water hammer eliminating and pressure reducing device for the protection valve, the blocking plate and the side surface of the sliding groove are in a T shape.
In the above water hammer eliminating pressure reducing device for protecting a valve, the first spring is made of a non-ferromagnetic material.
In the water hammer eliminating and pressure reducing device for the protection valve, the first flow-resisting bag and the second flow-resisting bag are both embedded on the inner wall of the water through opening.
In the above water hammer eliminating pressure reducing device for a protection valve, the width of the blocking plate is larger than that of the leakage passage.
In the water hammer eliminating and pressure reducing device for the protection valve, a pressure-sensitive chip is embedded on one side of the blocking plate close to the water through opening, and the pressure-sensitive chip is electrically connected with the electromagnetic block.
Compared with the prior art, the water hammer eliminating pressure reducing device of the protection valve has the advantages that:
according to the invention, on one hand, under the first straight surface, the first inclined surface, the second straight surface, the second inclined surface and the third straight surface with the width increasing gradually, according to the Bernoulli principle, the width is increased gradually, and the water pressure is reduced gradually, on the other hand, water flow continuously extrudes the plurality of piston plates and compresses the second spring, so that air in the first compression cavity and the second compression cavity is pressed into the first flow-resisting bag and the second flow-resisting bag through the first communicating pipe and the second communicating pipe respectively, the first flow-resisting bag and the second flow-resisting bag in the plurality of acting pieces form flow-resisting surfaces for sealing the water through port, the impact on the valve is avoided, and due to the compressibility of the air, the third compression cavity further plays a role in pressure reduction, so that the water hammer is thoroughly eliminated, the structure is simple, and the manufacturing cost is low.
Drawings
FIG. 1 is a perspective view of a water hammer eliminating pressure reducing device for a protection valve according to the present invention in a water hammer-free state;
FIG. 2 is a partially enlarged schematic view of FIG. 1;
FIG. 3 is an enlarged schematic view of the structure at A in FIG. 2;
fig. 4 is a perspective view showing a water hammer eliminating and pressure reducing device for protecting a valve according to the present invention in a water hammer state.
In the figure: 1 first connecting pipe, 2 second connecting pipe, 3 valve, 4 device bodies, 5 acting elements, 501 sliding groove, 502 blocking plate, 503 permanent magnetic block, 504 electromagnetic block, 505 first spring, 506 pressure sensitive chip, 507 discharge channel, 508 decompression cavity, 509 first straight surface, 510 first inclined surface, 511 second straight surface, 512 second inclined surface, 513 third straight surface, 514 first compression cavity, 515 second compression cavity, 516 third compression cavity, 517 piston plate, 518 second spring, 519 first connecting pipe, 520 second connecting pipe, 521 first flow-resisting bag and 522 second flow-resisting bag.
Detailed Description
The following examples are for illustrative purposes only and are not intended to limit the scope of the present invention.
Examples
Referring to fig. 1-4, a water hammer eliminating and pressure reducing device for protecting a valve comprises a first connecting pipe 1, a device body 4 and a second connecting pipe 2 which are sequentially arranged from left to right, wherein a water through opening with the same inner diameter as the first connecting pipe 1 and the second connecting pipe 2 is arranged in the device body 4, two ends of the water through opening are respectively detachably, hermetically and fixedly connected with the first connecting pipe 1 and the second connecting pipe 2, the second connecting pipe 2 is provided with a valve 3, and a plurality of acting elements 5 are uniformly arranged in the device body 4 in the circumferential direction by taking the water through opening as a circle center;
the action piece 5 comprises a sliding groove 501 arranged on the inner wall of the water through opening, a plugging plate 502 is connected in the sliding groove 501 in a sliding manner, permanent magnets 503 and electromagnetic blocks 504 are respectively and fixedly installed on the corresponding positions of the plugging plate 502 and the inner wall of the sliding groove 501, the permanent magnets 503 and the electromagnetic blocks 504 are attracted, namely the magnetic pole directions are opposite, and a first spring 505 is fixedly connected on one side of each permanent magnet 503 opposite to the corresponding side of the corresponding electromagnetic block 504;
the acting element 5 further comprises a drainage channel 507 which is arranged in the device body 4 and corresponds to the position of the blocking plate 502, the drainage channel 507 is obliquely arranged, one end of the drainage channel 507, which is far away from the blocking plate 502, is provided with a decompression chamber 508 with continuously increasing width, a first straight surface 509, a first inclined surface 510, a second straight surface 511, a second inclined surface 512 and a third straight surface 513 are sequentially arranged in the decompression chamber 508 from left to right, the first straight surface 509, the second straight surface 511 and the third straight surface 513 are respectively provided with a first compression chamber 514, a second compression chamber 515 and a third compression chamber 516 with different depths, the first compression chamber 514, the second compression chamber 515 and the third compression chamber 516 are respectively internally and hermetically connected with a piston plate 517 in a sliding manner, the piston plate 517, the first compression chamber 514, the second compression chamber 515 and the third compression chamber 516 are respectively and fixedly connected with a second spring 518, the first compression chamber 514 and the second compression chamber 515 are respectively communicated with a first communicating pipe 519 and a second communicating pipe 520, one end of the first communicating pipe 519, which is far away from the first compression chamber 514, is communicated with a first obstructing bag 521, and one end of the second communicating pipe 520, which is far away from the second compression chamber 515, is communicated with a second obstructing bag 522, which has certain structural strength.
The blocking plate 502 and the side surface of the sliding groove 501 are T-shaped, so that the blocking plate 502 is in limited sliding connection in the sliding groove 501, and the blocking plate and the sliding groove are in sealed sliding connection.
The first spring 505 is made of a non-ferromagnetic material, so as to avoid affecting the magnetic matching between the electromagnet block 504 and the permanent magnet block 503.
The first and second choking bags 521, 522 are embedded on the inner wall of the water through opening, and normal circulation of water flow is not affected under normal state.
The width of the blocking plate 502 is larger than the width of the flow discharging passage 507, so as to ensure that the blocking plate 502 can completely block the flow discharging passage 507.
The pressure-sensitive chip 506 is embedded on one side of the blocking plate 502 close to the water through opening, the pressure-sensitive chip 506 is electrically connected with the electromagnetic block 504, and the pressure-sensitive chip 506 is in the prior art.
The device can be detached, sealed and fixed with the first connecting pipe 1 and the second connecting pipe 2, can be flexibly installed on one side of a pipeline where the valve 3 is located, and is wide in application range.
In a normal use state of the device, under the elastic force of the first spring 505, the blocking plate 502 slides to the port of the drainage channel 507, water flow does not enter the decompression chamber 508 through the drainage channel 507, once the water hammer phenomenon described in the background art occurs, the inner wall of the water through port encounters the water hammer, when the upper pressure limit set by the pressure sensitive chip 506 is reached (the upper pressure limit can be within the range that can be borne by the first connecting pipe 1, the second connecting pipe 2 and the valve 3), the electromagnetic block 504 is automatically electrified, the magnetic attraction force generated to the permanent magnetic block 503 overcomes the elastic force of the first spring 505, the drainage channel 507 is leaked, water flow enters the decompression chamber 508 through the drainage channel 507, on one hand, under the first straight surface 509, the first inclined surface 510, the second straight surface 511, the second inclined surface 512 and the third straight surface 513 with the width increasing continuously, according to the bernoulli principle, the width gradually increases, the water pressure decreases, on the other hand, the water flow continuously extrudes the plurality of piston plates 517, and the second spring 518 is compressed, so that the air in the first compression chamber 514 and the second compression chamber 515 is pressed into the first choke bag 521 and the second choke bag 522 through the first communicating pipe 519 and the second communicating pipe 520, respectively, the first choke bag 521 and the second choke bag 522 in the plurality of acting elements 5 form a choke surface for closing the water passage, thereby avoiding impact on the valve 3, and the third compression chamber 516 further performs a decompression function due to the compressibility of the air.
It should be noted that, the water hammer phenomenon generally exists within a certain time, the power-on time of the electromagnetic block 504 is set through the pressure sensitive chip 506, so as to ensure that when there is no water hammer phenomenon, the water flow will flow back to the water through port through the drainage channel 507 and will not stay in the reduced pressure chamber 508, further, a hydrophobic layer can be coated in the reduced pressure chamber 508 to avoid adhesion, and after the power of the electromagnetic block 504 is cut off, the plugging plate 502 automatically returns to plug the drainage channel 507 under the restoring elasticity of the first spring 505.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (6)
1. A water hammer eliminating and pressure reducing device for protecting a valve comprises a first connecting pipe (1), a device body (4) and a second connecting pipe (2) which are sequentially arranged from left to right, and is characterized in that a water opening with the same inner diameter as the first connecting pipe (1) and the second connecting pipe (2) is formed in the device body (4), two ends of the water opening are respectively detachably, hermetically and fixedly connected with the first connecting pipe (1) and the second connecting pipe (2), a valve (3) is installed on the second connecting pipe (2), and a plurality of acting pieces (5) are uniformly arranged in the device body (4) in the circumferential direction by taking the water opening as a circle center;
the action piece (5) comprises a sliding groove (501) formed in the inner wall of the water opening, a blocking plate (502) is connected in the sliding groove (501) in a sliding mode, permanent magnets (503) and electromagnetic blocks (504) are fixedly installed on the corresponding positions of the blocking plate (502) and the inner wall of the sliding groove (501) respectively, the permanent magnets (503) and the electromagnetic blocks (504) are arranged in an attraction mode, and a first spring (505) is fixedly connected to one side, opposite to the electromagnetic blocks (504), of each permanent magnet (503);
action piece (5) still including set up in device body (4) and let out runner (507) that corresponds with shutoff board (502) position, and let out runner (507) slope setting, let out runner (507) and keep away from the one end of shutoff board (502) and offer decompression chamber (508) of width constantly increasing, be equipped with first straight face (509), first inclined plane (510), second straight face (511), second inclined plane (512), third straight face (513) from a left side to the right side in proper order in decompression chamber (508), first compression chamber (514), second compression chamber (515), third compression chamber (516) that the degree of depth is different are do not seted up to first straight face (509), second straight face (511), third straight face (513) punishment, all sealing sliding connection has piston plate (517) in first compression chamber (514), second compression chamber (515), third compression chamber (516), piston plate (517) and first compression chamber (514), Second compression chamber (515), third compression chamber (516) common fixedly connected with second spring (518) respectively, first compression chamber (514), second compression chamber (515) communicate respectively first communicating pipe (519) and second communicating pipe (520), the one end intercommunication that first compression chamber (514) were kept away from in first communicating pipe (519) has first choked flow bag (521), the one end intercommunication that second compression chamber (515) were kept away from in second communicating pipe (520) has second choked flow bag (522).
2. A valve protection water hammer relieving and pressure reducing device according to claim 1, wherein the blocking plate (502) and the side of the chute (501) are T-shaped.
3. The valve protection water hammer relieving pressure relief device of claim 1, wherein the first spring (505) is made of a non-ferromagnetic material.
4. The device for eliminating water hammer and reducing pressure of protection valve as claimed in claim 1, wherein the first and second choke bladders (521, 522) are embedded in the inner wall of the water port.
5. The valve train water hammer relieving pressure relief device of claim 1, wherein the width of said blocking plate (502) is greater than the width of the leakage path (507).
6. The water hammer eliminating and pressure reducing device for the protection valve is characterized in that a pressure-sensitive chip (506) is embedded on one side, close to the water through opening, of the blocking plate (502), and the pressure-sensitive chip (506) is electrically connected with the electromagnetic block (504).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010336854.2A CN111379923B (en) | 2020-04-26 | 2020-04-26 | Water hammer eliminating and pressure reducing device for protecting valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010336854.2A CN111379923B (en) | 2020-04-26 | 2020-04-26 | Water hammer eliminating and pressure reducing device for protecting valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111379923A true CN111379923A (en) | 2020-07-07 |
| CN111379923B CN111379923B (en) | 2021-07-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010336854.2A Active CN111379923B (en) | 2020-04-26 | 2020-04-26 | Water hammer eliminating and pressure reducing device for protecting valve |
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| Country | Link |
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| CN (1) | CN111379923B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111981210A (en) * | 2020-08-06 | 2020-11-24 | 安徽国登管业科技有限公司 | Antibacterial PE water supply pipe with water hammer resistance effect |
| CN112413270A (en) * | 2020-11-30 | 2021-02-26 | 鲁伟 | Water hammer effect offset device for straight water flow pipeline |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB900763A (en) * | 1960-02-23 | 1962-07-11 | Wilhelm Sydow Everett | Methods of and apparatus for attenuating sudden pressure surges in fluid lines |
| CN201568681U (en) * | 2009-11-20 | 2010-09-01 | 夭佳涵 | Pressure reducing device of water hammer |
| CN208281128U (en) * | 2018-06-14 | 2018-12-25 | 河南省智慧农业灌溉科技有限公司 | Water pump water hammer cancellation element |
| CN110067908A (en) * | 2019-03-14 | 2019-07-30 | 江苏大学 | A kind of water hammer crushing device of inlet of self-sucking pump pipeline |
| CN110081266A (en) * | 2019-05-27 | 2019-08-02 | 左莉莉 | A kind of water hammer elimination decompressor for valve protection |
| CN111059399A (en) * | 2020-02-20 | 2020-04-24 | 中国土木工程集团有限公司 | Large-diameter pipeline restraining and water hammer balancing device and method |
-
2020
- 2020-04-26 CN CN202010336854.2A patent/CN111379923B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB900763A (en) * | 1960-02-23 | 1962-07-11 | Wilhelm Sydow Everett | Methods of and apparatus for attenuating sudden pressure surges in fluid lines |
| CN201568681U (en) * | 2009-11-20 | 2010-09-01 | 夭佳涵 | Pressure reducing device of water hammer |
| CN208281128U (en) * | 2018-06-14 | 2018-12-25 | 河南省智慧农业灌溉科技有限公司 | Water pump water hammer cancellation element |
| CN110067908A (en) * | 2019-03-14 | 2019-07-30 | 江苏大学 | A kind of water hammer crushing device of inlet of self-sucking pump pipeline |
| CN110081266A (en) * | 2019-05-27 | 2019-08-02 | 左莉莉 | A kind of water hammer elimination decompressor for valve protection |
| CN111059399A (en) * | 2020-02-20 | 2020-04-24 | 中国土木工程集团有限公司 | Large-diameter pipeline restraining and water hammer balancing device and method |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111981210A (en) * | 2020-08-06 | 2020-11-24 | 安徽国登管业科技有限公司 | Antibacterial PE water supply pipe with water hammer resistance effect |
| CN112413270A (en) * | 2020-11-30 | 2021-02-26 | 鲁伟 | Water hammer effect offset device for straight water flow pipeline |
| CN112413270B (en) * | 2020-11-30 | 2022-08-30 | 广东纳大管业科技有限公司 | Water hammer effect offset device for straight water flow pipeline |
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| CN111379923B (en) | 2021-07-02 |
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Effective date of registration: 20210611 Address after: 325100 he'er village, Dongou street, Yongjia County, Wenzhou City, Zhejiang Province Applicant after: TEJI VALVE GROUP Co.,Ltd. Address before: 230088 150 meters west of the intersection of innovation Avenue and Wanshui Road, high tech Zone, Hefei City, Anhui Province Applicant before: Wu Lei |
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