CN218935400U - Pipeline protection device under medium-pressure environment - Google Patents
Pipeline protection device under medium-pressure environment Download PDFInfo
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- CN218935400U CN218935400U CN202223514520.3U CN202223514520U CN218935400U CN 218935400 U CN218935400 U CN 218935400U CN 202223514520 U CN202223514520 U CN 202223514520U CN 218935400 U CN218935400 U CN 218935400U
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- guiding
- pressure environment
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- 238000007789 sealing Methods 0.000 claims abstract description 29
- 235000017166 Bambusa arundinacea Nutrition 0.000 claims description 12
- 235000017491 Bambusa tulda Nutrition 0.000 claims description 12
- 241001330002 Bambuseae Species 0.000 claims description 12
- 235000015334 Phyllostachys viridis Nutrition 0.000 claims description 12
- 239000011425 bamboo Substances 0.000 claims description 12
- 230000001012 protector Effects 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 31
- 230000000712 assembly Effects 0.000 abstract description 6
- 238000000429 assembly Methods 0.000 abstract description 6
- 230000001502 supplementing effect Effects 0.000 abstract description 3
- 230000001105 regulatory effect Effects 0.000 description 6
- 238000000034 method Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 239000008400 supply water Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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Abstract
The utility model provides a pipeline protection device in a medium-pressure environment, and relates to the field of pipeline pressure regulation; the valve comprises an upper valve cylinder and a lower valve cylinder, wherein a cavity is formed between the upper valve cylinder and the lower valve cylinder, a piston guide cylinder is arranged in the cavity, the piston guide cylinder vertically slides along the inner walls of the upper valve cylinder and the lower valve cylinder, an adjusting spring component for adjusting the interval between the piston guide cylinder and the upper valve cylinder is arranged on the piston guide cylinder, one end of the adjusting spring component is connected with the piston guide cylinder, and the other end of the adjusting spring component is rotatably connected with the upper valve cylinder; in order to adjust the movement travel path of the piston and control the movement distance of the closed one-way sealing plate, two different ways of adjusting spring assemblies are designed, and the distance between the piston guide cylinder and the cylinder top wall of the upper valve cylinder is controlled by adjusting the whole length of the adjusting spring assemblies, so that a water hammer generated by suddenly stopping the pump is eliminated, and a water supplementing function to a pipeline can be realized under a negative pressure state; the safe operation of the burst state of the pipeline can be effectively protected.
Description
Technical Field
The utility model relates to the field of pipeline pressure protection equipment, in particular to a pipeline protection device in a medium-pressure environment.
Background
The pipeline pressure regulating device refers to a pressure regulating chamber positioned above the ground. The pipeline pressure regulating device is a water hammer protection measure for preventing the separation of water columns and is often arranged at a position which is easy to generate water hammer in a pipeline system. The different from the pipeline protector is that a check valve is arranged on the junction pipe of the water chamber of the tower body and the main water outlet pipe of the pump station, and the opening and closing of the check valve is controlled by the pressure of the water outlet pipe. When the water pump is started, the check valve is in a closed state, water is filled into the water chamber through the water supplementing pipe, and after the water level reaches the normal water level, the ball float valve at the outlet of the water supplementing pipe is closed, so that the water level of the water chamber is automatically kept. When the pump is stopped in accident, when the pressure of the main pipe is reduced to be lower than the water level of the pipeline protection device, the check valve is opened rapidly, and water is supplemented to the main pipeline through the short connecting pipe, so that the pressure in the main pipeline of the pump station is prevented from being reduced to generate water column separation.
In the prior art, in the pipeline pressure regulating device, a fluid pipeline protection device with the application number of CN200720015909.X adopts a pressure regulating mode: the spring adjusting component pre-adjusts the pressure of the spring according to the lowest pressure value meeting the pipe network requirement, when the pipe network pressure is lower than the pressure value, the switch plate is pressed on the switch seat, the through hole is closed, and water supply is stopped. When the pipe network water pressure is higher than the pressure of spring, the switch board is pushed away, and water flow to the export begins to supply water, and the defect that exists in this in-process lies in that this spring adjusting part overall length can not be adjusted, and then can't adjust piston motion stroke length according to actual conditions, finally leads to the piston to open or close waste time more.
Disclosure of Invention
The utility model aims to provide a pipeline protection device in a medium-pressure environment, which can be used for replacing the problem that the original spring adjusting assembly cannot adjust the whole length by adjusting the structure of the whole length of the spring adjusting assembly, and on one hand, the spring adjusting assembly with adjustable length can be used for adjusting the spring adjusting assembly to increase the sealing specific pressure of a sealing surface of a contact surface between a piston guide cylinder and a lower valve cylinder, and can be used for adjusting the movement stroke of a piston to quickly reduce or eliminate the pressure rise of a water hammer in a pipeline.
Embodiments of the present utility model are implemented as follows:
the embodiment of the application provides a pipeline protection device under medium pressure environment, including last valve section of thick bamboo and lower valve section of thick bamboo, have the cavity between last valve section of thick bamboo and lower valve section of thick bamboo, be provided with the piston draft tube that can vertically slide in the cavity, be provided with the adjusting spring subassembly that is used for adjusting interval between piston draft tube and the last valve section of thick bamboo top on the piston draft tube, the other end rotation of adjusting spring subassembly is connected on last valve section of thick bamboo.
In some embodiments of the present utility model, the adjusting spring assembly includes a nut and a screw threaded through the nut, the nut is fixed on the upper valve cylinder, a lower spring protection cover slidably engaged with the nut is provided at the bottom of the screw, the lower spring protection cover is mounted on the piston guide cylinder, a spring set is sleeved on the screw, an upper spring protection cover is provided at the top of the spring set, and the upper spring protection cover is fixed on the screw.
In some embodiments of the present utility model, a spring guide sleeve is disposed at the bottom of the upper spring protection cover, and the spring guide sleeve is slidably connected with the screw.
In some embodiments of the utility model, the end of the screw is provided with a nut, and the nut is connected with the screw.
In some embodiments of the present utility model, a spring guide sleeve is disposed at the top of the lower spring protection cover, the spring guide sleeve is fixedly connected with the upper spring protection cover, and the spring guide sleeve is slidably connected with the screw.
In some embodiments of the utility model, the screw is divided into an upper section and a lower section, the upper section diameter of the screw being greater than the lower section diameter of the screw.
In some embodiments of the present utility model, the spring set includes an inner spring and an outer spring, each of which is sleeved on the screw rod between the upper spring protection cover and the lower spring protection cover.
In some embodiments of the present utility model, the bottom of the lower valve cylinder is provided with an evacuation device, and the evacuation device includes a threaded pipe fixed at the bottom of the lower valve cylinder, and the bottom of the threaded pipe is connected with a muffler through a clamp.
In some embodiments of the present utility model, a unidirectional sealing plate is disposed at the bottom of the piston guide cylinder, a through hole is disposed on the unidirectional sealing plate, and a guiding and positioning device for sliding the unidirectional sealing plate is disposed below the unidirectional sealing plate.
In some embodiments of the present utility model, the guiding and positioning device includes a first guiding rod installed at the bottom of the unidirectional sealing plate, a guiding cylinder is arranged at the bottom of the guiding rod, and the guiding cylinder is fixed at the bottom of the lower valve cylinder, wherein the guiding cylinder and the guiding rod are coaxially collinear, and the guiding rod is inserted into the guiding cylinder and is in sliding fit with the guiding cylinder.
Compared with the prior art, the embodiment of the utility model has at least the following advantages or beneficial effects:
in order to control the moving distance of the closed unidirectional sealing plate in order to respond and adjust the moving stroke path of the piston in time, the utility model designs two different ways of adjusting spring assemblies, and the distance between the piston guide cylinder and the cylinder top wall of the upper valve cylinder is controlled by adjusting the whole length of the adjusting spring assemblies, so that the pressure of a pipeline water hammer is eliminated by adjusting, the whole moving time can be shortened by adjusting the closed interval, water is supplemented to the pipeline when the pipeline is under negative pressure, and the whole safety is finally improved.
Drawings
In order to more clearly describe the technical solution of the embodiment of the present utility model, the drawings required for embodiment 5 will be briefly described, and it should be understood that the following drawings only illustrate the present utility model
Certain embodiments of the pattern should not be taken as limiting the scope, and other related drawings may be obtained from these drawings by those of ordinary skill in the art without undue burden.
FIG. 1 is a schematic view of a pipeline protection device in a medium-pressure environment according to an embodiment of the present utility model;
FIG. 2 is a side view of FIG. 1 in an embodiment of the utility model;
FIG. 3 is a schematic cross-sectional view of the portion A-A of FIG. 2 according to an embodiment of the present utility model;
FIG. 4 is an enlarged schematic view of the portion A3 of FIG. 3 in accordance with an embodiment of the present utility model;
FIG. 5 is an enlarged schematic view of the portion A4 of FIG. 3 in accordance with an embodiment of the present utility model;
FIG. 6 is a bottom view of FIG. 1 in an embodiment of the utility model;
FIG. 7 is a schematic view showing a cross-sectional structure at C-C of FIG. 6 in accordance with an embodiment of the present utility model;
FIG. 8 is an enlarged schematic view of the portion A1 of FIG. 7 in accordance with an embodiment of the present utility model;
fig. 9 is an enlarged view of A2 of fig. 7 according to an embodiment of the present utility model.
Icon: 1-a valve cylinder; 2-a lower valve cylinder; 3-a piston guide cylinder; 4-an adjustment spring assembly; 5-nuts; 6-a screw; 7-a lower spring protection cover; 8-an upper spring protection cover; 9-spring set; 10-a spring guide sleeve; 11-an evacuation device; 12-threaded pipe; 13-a muffler; 14-guiding and positioning device; 15-a guide rod; 16-a guide cylinder; 17-one-way sealing plate.
Detailed Description
In the description of the embodiments of the present utility model, it should be noted that, if the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate an azimuth or a positional relationship based on that shown in the drawings, or an azimuth or a positional relationship in which the product of the present utility model is conventionally put when used, it is merely for convenience of describing the present utility model and simplifying the description, and it does not indicate or imply that the apparatus or element to be referred to must have a specific azimuth, be configured and operated in a specific azimuth, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," "third," and the like are used merely for distinguishing between descriptions and not for understanding as a meaning.
Example 1
Referring to fig. 1, fig. 1 shows a schematic structural diagram of a pipeline protection device in a medium pressure environment, fig. 2 shows a side view of fig. 1 for the present embodiment, and fig. 3 shows a schematic structural diagram of a section A-A of fig. 2 in the embodiment, wherein the structure includes an upper valve cylinder 1 and a lower valve cylinder 2, a piston guide cylinder 3 is disposed in an inner cavity between the upper valve cylinder 1 and the lower valve cylinder 2, the piston guide cylinder 3 vertically slides along inner walls of the upper valve cylinder 1 and the lower valve cylinder 2, an adjusting spring assembly 4 for adjusting a space between the piston guide cylinder 3 and an upper cover is disposed on the piston guide cylinder 3, one end of the adjusting spring assembly 4 is connected with the piston guide cylinder 3, and the other end of the adjusting spring assembly 4 is rotatably connected with the upper valve cylinder 1.
In practical use, the pipeline protection device further comprises a one-way sealing plate 17 arranged at the bottom of the piston guide cylinder 3, a through hole is arranged on the one-way sealing plate 17, the maximum pressure of the flow regulating valve water hammer is controlled by adjusting the spring component 4, when the pressure of the pipeline is increased, the acting force acting on the one-way sealing plate 18 is larger than the acting force of the spring, the one-way sealing plate 18 is opened, and water in the pipeline flows out through the upper valve cylinder 1, so that
When the unidirectional sealing plate 17 generates negative pressure in the pipeline, the unidirectional sealing plate 17 is opened to supplement water for the pipeline to prevent the pipeline from deforming due to the negative pressure, so that the pipeline is protected from being damaged due to the excessively high pressure of the pipeline or the generated negative pressure; in order to respond to the adjustment of the piston movement travel path in time in the process, the manual selection of the specific piston movement is performed, and the consideration of the closed movement time is shortened, so that the adjustment spring assembly 4 is designed, the distance between the piston guide cylinder 3 and the cylinder top wall of the upper valve cylinder 1 is controlled by adjusting the whole length of the adjustment spring assembly 4, and the closed interval is adjusted while the maximum pressure of the flow adjustment valve water hammer is adjusted, so that the whole movement time is shortened.
As shown in fig. 7, in some embodiments of the present utility model, in order to facilitate adjusting the distance between the piston guide cylinder 3 and the cylinder top wall of the upper valve cylinder 1, two ways of A1 and A2 are designed to adjust the length of the adjusting spring assembly 4, wherein A1 and A2 are respectively enlarged structural schematic diagrams of fig. 7, the number of the arrangements of A1 and A2 can be selected according to actual needs, and then A1 or A2 can be installed in an array distribution or symmetrical distribution manner, or a combination of A1 and A2 can be installed;
the adjustment system structure of A1 is as shown in fig. 8, and the connection is as follows:
the adjusting spring assembly 4 comprises a nut 5 and a screw rod 6 inserted in the nut 5, the nut 5 is in threaded fit with the screw rod 6, the nut 5 is fixed on the upper valve cylinder 1, a lower spring protection cover 7 is arranged at the bottom of the screw rod 6, the lower spring protection cover 7 is installed on the piston guide cylinder 3, the lower spring protection cover 7 is in sliding connection with the screw rod 6, a spring group 9 is sleeved on the screw rod 6, an upper spring protection cover 8 is arranged at the top of the spring group 9, and the upper spring protection cover 8 is fixed on the screw rod 6.
When the piston type hydraulic pump is used, if a piston movement stroke path needs to be shortened, the screw rod 6 is rotated, the screw rod 6 is in threaded fit with the nut 5, the nut 5 is fixed on the upper valve cylinder 1, the screw rod 6 is rotated to move downwards along the central axis direction of the nut, the upper spring protection cover 8 fixedly connected to the screw rod 6 is driven to rotate and move synchronously together when the screw rod 6 moves downwards, the tail end of the screw rod 6 continuously moves towards the piston guide cylinder 3 below the spring protection cover 7, and then the upward moving distance of the piston guide cylinder 3 is shortened.
Meanwhile, as shown in fig. 9, in order to protect the spring group 9 from the extrusion eccentric motion when being extruded; therefore, after the spring guide sleeve 10 is fixedly connected with the upper spring protection cover 8, the spring guide sleeve 10 moves up and down along with the upper spring protection cover 8, and the spring guide sleeve 10 is in sliding connection with the screw rod 6, so that the screw rod 6 is divided into an upper section and a lower section for positioning the position of the spring guide sleeve 10 on the upper spring protection cover 8, the diameter of the upper section of the screw rod 6 is larger than that of the lower section of the screw rod 6, when the spring guide sleeve 10 reaches an interface between the upper section and the lower section of the screw rod 6, the spring guide sleeve 10 can be limited to continue to move upwards towards the upper spring protection cover 8, meanwhile, the spring guide sleeve 10 and the spring protection cover 8 can be in threaded connection, and then can be conveniently disassembled, and finally, a nut is arranged at the tail end of the screw rod 6 for limiting the tail end of the screw rod 6 to slide out of the spring guide sleeve 10.
The adjustment mode structure of A2 is as follows:
as shown in fig. 8, the adjusting spring assembly 4 comprises a nut 5 and a screw rod 6 inserted in the nut 5, the nut 5 is in threaded connection with the screw rod 6, the nut 5 is fixed on the upper valve cylinder 1, a lower spring protection cover 7 is arranged at the bottom of the screw rod 6, the lower spring protection cover 7 is installed on the piston guide cylinder 3, the lower spring protection cover 7 is in sliding connection with the screw rod 6, a spring group 9 is sleeved on the screw rod 6, an upper spring protection cover 8 is arranged at the top of the spring group 9, the upper spring protection cover 8 is fixed on the screw rod 6, a spring guide sleeve 10 is arranged at the top of the lower spring protection cover 7, the spring guide sleeve 10 is fixedly connected with the upper spring protection cover 8, and the spring guide sleeve 10 is in sliding connection with the screw rod 6.
The spring group 9 comprises an inner spring and an outer spring, wherein the inner spring and the outer spring are sleeved on the screw rod 6 between the upper spring protection cover 8 and the lower spring protection cover 7, and the specific mode is that the diameter of the inner spring is smaller than that of the outer spring, namely the outer spring is sleeved on the inner spring, so that the elastic requirement of the inner spring is increased under the same height.
As shown in fig. 5, in order to avoid the situation that the pressure of the upper cavity and the pressure of the lower cavity are the same and generate constant pressure failure, an evacuation device 11 is arranged at the bottom of the lower valve cylinder 2, the evacuation device 11 comprises a threaded pipe 12 and a muffler 13, wherein the threaded pipe 12 is fixed at the bottom of the lower valve cylinder 2, the muffler 13 and the threaded pipe 12 are fixed through a clamp, the subsequent disassembly of the threaded pipe 12 and the threaded pipe is facilitated, and finally, the muffler 13 is used for eliminating noise in the process of reducing the pressure of the cavity.
A guiding and positioning device 14 for sliding the unidirectional sealing plate 17 is arranged below the unidirectional sealing plate 17; wherein, the guiding and positioning device 14 comprises a first guiding rod 15 arranged at the bottom of a unidirectional sealing plate 17, a guiding cylinder 16 is arranged at the bottom of the guiding rod 15, the guiding cylinder 16 is fixed at the bottom of the lower valve cylinder 2, the guiding cylinder 16 and the guiding rod 15 are coaxially and collinearly, and the guiding rod 15 is inserted into the guiding cylinder 16 and is in sliding fit with the guiding cylinder 16.
Wherein, in the process of moving the unidirectional sealing plate 17 up and down, the guiding positioning device 14 guides the movement of the unidirectional sealing plate, and when the unidirectional sealing plate 17 is guided, the guiding rod 15 moves up and down along the axis direction of the guiding cylinder 16, so that the unidirectional sealing plate 17 can be prevented from shifting in the moving process.
In summary, in order to control the movement distance of the closed unidirectional sealing plate in order to respond to the adjustment of the movement travel path of the piston in time, the utility model designs two different ways of adjusting spring assemblies 4, and the distance between the piston guide cylinder 3 and the cylinder top wall of the upper valve cylinder 1 is controlled by adjusting the whole length of the adjusting spring assemblies 4, so that the maximum pressure of the water hammer of the flow adjusting valve is adjusted, the closed interval is adjusted, the whole movement time is shortened, and the whole safety is improved.
The above is only a preferred embodiment of the present utility model, and is not intended to limit the present utility model, but various modifications and variations can be made to the present utility model by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.
Claims (10)
1. The utility model provides a pipeline protection device under middling pressure environment, its characterized in that, including last valve section of thick bamboo (1) and lower valve section of thick bamboo (2), it has the cavity to go up between valve section of thick bamboo (1) and the lower valve section of thick bamboo (2), be provided with piston guide cylinder (3) that can vertically slide in the cavity, be provided with on piston guide cylinder (3) and be used for adjusting piston guide cylinder (3) and go up adjusting spring subassembly (4) of interval between valve section of thick bamboo (1) top, the other end rotation of adjusting spring subassembly (4) is connected on last valve section of thick bamboo (1).
2. The pipeline protection device under the medium pressure environment according to claim 1, wherein the adjusting spring assembly (4) comprises a nut (5) and a screw rod (6) inserted in the nut (5), the nut (5) is in threaded connection with the screw rod (6), the nut (5) is fixed on the upper valve cylinder (1), a lower spring protection cover (7) in sliding fit with the screw rod (6) is arranged at the bottom of the screw rod (6), the lower spring protection cover (7) is arranged on the piston guide cylinder (3), a spring group (9) is sleeved on the screw rod (6), an upper spring protection cover (8) is arranged at the top of the spring group (9), and the upper spring protection cover (8) is fixed on the screw rod (6).
3. Pipeline protection device under medium pressure environment according to claim 2, characterized in that the bottom of the upper spring protection cover (8) is provided with a spring guide sleeve (10), and the spring guide sleeve (10) is in sliding connection with the screw (6).
4. A pipeline protector in a medium pressure environment according to claim 3, characterized in that the end of the screw (6) is provided with a nut, which nut is connected to the screw (6).
5. Pipeline protection device under medium pressure environment according to claim 2, characterized in that the top of lower spring protection cover (7) is provided with spring guide sleeve (10), spring guide sleeve (10) and last spring protection cover (8) fixed connection, and spring guide sleeve (10) and screw rod (6) sliding connection.
6. The pipeline protector in a medium pressure environment according to claim 5, characterized in that the screw (6) is divided into an upper section and a lower section, the upper section diameter of the screw (6) is larger than the lower section diameter of the screw (6).
7. Pipeline protection device under medium pressure environment according to claim 2, characterized in that the spring group (9) comprises an inner spring and an outer spring, which are both sleeved on the screw (6) between the upper spring protection cover (8) and the lower spring protection cover (7).
8. Pipeline protection device under medium pressure environment according to claim 1, characterized in that the bottom of the lower valve cylinder (2) is provided with an evacuation device (11), the evacuation device (11) comprises a threaded pipe (12) fixed at the bottom of the lower valve cylinder (2), and the bottom of the threaded pipe (12) is connected with a muffler (13) through a clamp.
9. Pipeline protection device under medium pressure environment according to claim 1, characterized in that the bottom of piston draft tube (3) is provided with unidirectional sealing plate (17), be provided with the through-hole on unidirectional sealing plate (17), unidirectional sealing plate (17) below is provided with guiding and positioning device (14) that are used for unidirectional sealing plate (17) to slide.
10. Pipeline protection device under medium pressure environment according to claim 9, characterized in that the guiding and positioning device (14) comprises a guiding rod (15) arranged at the bottom of a one-way sealing plate (17), a guiding cylinder (16) is arranged at the bottom of the guiding rod (15), the guiding cylinder (16) is fixed at the bottom of the lower valve cylinder (2), the guiding cylinder (16) and the guiding rod (15) are coaxially and collinearly arranged, and the guiding rod (15) is inserted into the guiding cylinder (16) and is in sliding fit with the guiding cylinder (16).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223514520.3U CN218935400U8 (en) | 2022-12-28 | 2022-12-28 | Pipeline protection device under medium-pressure environment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223514520.3U CN218935400U8 (en) | 2022-12-28 | 2022-12-28 | Pipeline protection device under medium-pressure environment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN218935400U true CN218935400U (en) | 2023-04-28 |
| CN218935400U8 CN218935400U8 (en) | 2024-05-28 |
Family
ID=86068812
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202223514520.3U Active CN218935400U8 (en) | 2022-12-28 | 2022-12-28 | Pipeline protection device under medium-pressure environment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218935400U8 (en) |
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2022
- 2022-12-28 CN CN202223514520.3U patent/CN218935400U8/en active Active
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| Publication number | Publication date |
|---|---|
| CN218935400U8 (en) | 2024-05-28 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CU01 | Correction of utility model |
Correction item: Patentee Correct: Tianjin Tanggu Watts Valve Co., Ltd. False: Tianjin Tanggu Gas Special Valve Co., Ltd. Number: 17-02 Page: The title page Volume: 39 Correction item: Patentee Correct: Tianjin Tanggu Watts Valve Co., Ltd. False: Tianjin Tanggu Gas Special Valve Co., Ltd. Number: 17-02 Volume: 39 |
|
| OR01 | Other related matters |