CN110118267B - Fixing device and method for precisely installing valve seat - Google Patents
Fixing device and method for precisely installing valve seat Download PDFInfo
- Publication number
- CN110118267B CN110118267B CN201910542343.3A CN201910542343A CN110118267B CN 110118267 B CN110118267 B CN 110118267B CN 201910542343 A CN201910542343 A CN 201910542343A CN 110118267 B CN110118267 B CN 110118267B
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- valve seat
- valve body
- valve
- fixing pieces
- threaded
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- 238000000034 method Methods 0.000 title claims abstract description 24
- 238000009434 installation Methods 0.000 claims abstract description 35
- 230000013011 mating Effects 0.000 claims description 3
- 238000007789 sealing Methods 0.000 abstract description 4
- 238000007599 discharging Methods 0.000 description 3
- 230000005484 gravity Effects 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 239000002918 waste heat Substances 0.000 description 3
- 239000002826 coolant Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000011900 installation process Methods 0.000 description 2
- 230000007935 neutral effect Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000005855 radiation Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K5/00—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary
- F16K5/06—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary with plugs having spherical surfaces; Packings therefor
- F16K5/0626—Easy mounting or dismounting means
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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
- F16K5/00—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary
- F16K5/08—Details
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Valve Housings (AREA)
Abstract
A fixing device and a method for precisely installing a valve seat belong to the technical field of valve seat installation. The fixing device comprises a plurality of groups of first fixing pieces and second fixing pieces which are matched with each other, wherein the first fixing pieces sequentially comprise a first threaded connection part, an extension shaft and a first operation part, which are connected with a threaded hole of a valve body, and a first connection table is arranged at one end of the first threaded connection part, which is connected with the extension shaft; the second mounting is including the second threaded connection portion, the second operating portion of simultaneously connecting valve body screw hole and disk seat screw hole, and the second mounting is equipped with the central through-hole of cooperation extension axle, and the one end that second threaded connection portion kept away from the second operating portion is equipped with the second connection platform of cooperation first connection platform, and the external diameter of first threaded connection portion is the same with second threaded connection portion. The invention can effectively and accurately install the large-caliber valve seat on the valve body in a vertical state, thereby ensuring the sealing performance and high reliability of the valve seat.
Description
Technical Field
The invention relates to the technical field of valve seat installation, in particular to a fixing device and method for valve seat accurate installation.
Background
The PRHR HX (passive waste heat discharging heat exchanger) of the AP1000 power station is positioned in an IRWST (containment vessel internal refueling water storage tank), the pipe side of the PRHR HX is maintained under the pressure of an RCS (reactor coolant system) and is filled with low-temperature coolant, and under the accident working condition, the flow control valve of the passive waste heat discharging heat exchanger is opened to realize the safety function. During normal operation, the flow control valve is in a closed position, if internal leakage of the valve occurs, the temperature of a refueling water storage tank in the containment is increased, and excessive leakage can cause shutdown of the power plant.
The valve body of the flow regulating valve of the passive waste heat discharging heat exchanger is a C-shaped ball valve, and the sealing grade of the valve is Class V, so that high requirements are put on the installation quality of all parts of the valve, and especially the installation of a valve seat affecting sealing is a key point needing special attention in the assembly process. The valve is a large-caliber C-shaped ball valve which is horizontally installed, the valve seat is vertically installed on the valve body, the valve is designed to fix the valve seat on the valve body, the gap between the guide surface and the outer ring of the valve seat is too large, and the positioning effect cannot be realized, so that the accurate positioning of the valve seat can only be ensured by means of the valve seat fastening bolts. Under the actual condition, the neck part of the valve seat fastening bolt is provided with a polish rod part, and the phenomenon that the valve seat slides from the polish rod part of the bolt easily occurs in the final stage of actual assembly, so that the valve seat is repeatedly assembled. Therefore, the installation of the valve seat has serious problems for the skill level of personnel, operation experience, site conditions and the like. The valve is positioned in the nuclear island-loop system, and the dosage rate in the pipeline is high in the disassembled state. The valve seat is designed and manufactured by combining the design of the valve, the actual condition of the site is considered, the device for accurately positioning and installing the valve seat is required to be designed and manufactured, the accuracy and precision of assembly are improved, the tightness of the valve is ensured, and the valve seat is realized to be high-efficient and accurately assembled on the premise of ensuring the quality and safety, so that the radiation dose of personnel is reduced, and the unit is safe and reliable to operate.
Disclosure of Invention
The present invention has been made to solve the above-mentioned problems occurring in the prior art, and an object of the present invention is to provide a fixing device and method for precisely mounting a valve seat, which can effectively and precisely mount a large-caliber valve seat to a valve body in a vertical state, thereby ensuring the sealing performance of the valve seat and its high reliability.
The invention aims at realizing the following technical scheme:
the fixing device for precisely installing the valve seat comprises a plurality of groups of first fixing pieces and second fixing pieces which are matched with each other, wherein the first fixing pieces sequentially comprise a first threaded connection part, an extension shaft and a first operation part which are connected with a threaded hole of a valve body, and a first connection table is arranged at one end of the first threaded connection part, which is connected with the extension shaft; the second mounting is including the second threaded connection portion, the second operating portion of simultaneously connecting valve body screw hole and disk seat screw hole, just the second mounting is equipped with the cooperation the central through-hole of extension axle, second threaded connection portion is kept away from the one end of second operating portion is equipped with the cooperation the second connection platform of first connection platform, the external diameter of first threaded connection portion is the same with second threaded connection portion.
The use principle of the fixing device is as follows: the method comprises the steps of firstly installing a plurality of first fixing pieces in a plurality of threaded holes of a valve body through first threaded connection parts of the first fixing pieces, then installing a valve seat in the valve body, enabling an extending shaft of the first fixing pieces to just penetrate through the threaded holes of the valve seat, then sleeving a second fixing piece on the extending shaft of the first fixing pieces, sequentially screwing in the valve seat and the valve body through second threaded connection parts of the second fixing pieces until a first connection table is tightly attached to a second connection table, at the moment, completing positioning of the valve seat and the valve body, subsequently screwing in other threaded holes of the valve seat fastening bolts, finally disassembling the first fixing pieces and the second fixing pieces, screwing in the valve seat fastening bolts in the disassembled threaded holes of the first fixing pieces and the second fixing pieces, and completing accurate installation of the valve seat. The device not only plays a role in accurate centering between the valve seat and the valve body, but also plays a role in bearing the valve seat because the valve seat is in a vertical state, and avoids the situation that the valve seat is deflected due to gravity. In addition, at least 3 sets of fixing members, such as three trisection points respectively provided at 0 °, 120 °, 240 °, i.e., right upper, lower left, and lower right, or 4 sets of fixing members, such as four points respectively provided at 0 °, 90 °, 180 °, 270 °, i.e., right upper, lower right, left, and right, are required to be employed in order to secure positioning accuracy and stability. The neutral can be further ensured by measurement during the installation process, and adjustment can be performed by adding gaskets and the like.
Preferably, the first and second connection stages have mating tapered surfaces. The structure can further ensure the centering between the first fixing piece and the second fixing piece, thereby ensuring the centering of the valve seat and the valve body and the mounting accuracy.
The invention also provides a method for precisely installing the valve seat, which adopts the fixing device for precisely installing the valve seat and comprises the following steps:
step 1, four first fixing pieces are respectively arranged in four threaded holes of the valve body, namely, the upper part, the lower part, the right left part and the right part;
step 2, mounting the valve seat into the valve body, and placing an adjusting gasket between the lowest part of the valve seat and the valve body;
step 3, respectively measuring gaps at the right upper, right lower, right left and right positions between the outer edge of the valve seat and the side wall of the valve seat installation guide hole in the valve body, ensuring that the gaps are the same everywhere, and if the gaps have deviation, balancing the gap difference value by arranging an adjusting gasket;
step 4, respectively sleeving the four second fixing pieces on the first fixing pieces, and installing the four second fixing pieces in the four threaded holes of the valve body and the valve seat;
step 5, sequentially installing valve seat fastening bolts into the valve seat and the rest threaded holes on the valve body;
step 6, sequentially removing the four groups of first fixing pieces and second fixing pieces, and installing valve seat fastening bolts in corresponding threaded holes;
and 7, fastening all valve seat fastening bolts to a specified moment value.
Preferably, the thickness of the adjusting gasket is half of the difference between the outer diameter of the valve seat and the inner diameter of the valve seat installation guide hole in the valve body.
Preferably, the step 1 further includes, before: all threaded holes on the valve body and/or the valve seat are numbered and marked in a crisscross method mode, and simultaneously the threaded holes in the four positions of the right upper position, the right lower position, the right left position and the right position are marked with emphasis. The crisscross arrangement is described as a set of four threaded holes, with 90 ° spacing between the four threaded holes of each set, and with each two threaded holes on opposite sides in numbered order, see fig. 3. The subsequent operation of installing the fixing piece or the valve seat fastening bolt is quicker through numbering, and meanwhile, the stress uniformity of the valve seat can be ensured according to the crossed sequence installation, so that the improvement of the installation accuracy is facilitated. The position of the mounting fixing piece is emphasized at the marked position, so that the indicating performance is stronger, and the mounting is not easy to make mistakes.
In the present invention, it is preferable that the first fixing member and the second fixing member are mounted in the order of the screw holes. As described above, the mounting mode and sequence are faster and higher in efficiency, and meanwhile, the stress uniformity of the valve seat can be ensured, so that the mounting accuracy is improved.
In the present invention, it is preferable that the valve seat fastening bolts are attached in the order of the screw hole numbers. Similarly, the mounting mode and the sequence are quicker, the efficiency is higher, and meanwhile, the stress uniformity of the valve seat can be ensured, so that the mounting accuracy is improved.
In the present invention, it is preferable that all the valve seat fastening bolts are fastened to the predetermined torque value in the order of the screw hole numbers. Similarly, the fastening mode and the sequence are faster, the efficiency is higher, and meanwhile, the stress uniformity of the valve seat can be ensured, so that the mounting accuracy is improved.
Preferably, the method further comprises, between the step 4 and the step 5: and taking out all the adjusting gaskets. After accurate location, the adjustment gasket can be taken out to avoid causing the influence to the normal use of valve.
Preferably, the step 7 further includes: and measuring gaps at the right upper, right lower, right left and right positions between the outer edge of the valve seat and the side wall of the valve seat mounting hole in the valve body again, and if the gaps are the same at all positions, performing subsequent valve mounting operation. This step is intended to ensure the accuracy of the installation and if errors occur due to operational errors or other factors, adjustments or reinstallations are required to avoid affecting the tightness of the valve.
The invention has the advantages that:
1. the mounting difficulty that deflection is easy to occur due to the gravity of the valve seat in the vertical state of the large-caliber valve seat is overcome;
2. the valve seat is accurately positioned on the valve body, and high accuracy is further ensured in a gap measurement mode;
3. the valve seat is firmly fixed on the valve body before and after fastening, so that the fastening effect of the valve seat and the tightness of the valve are ensured.
4. Compared with the traditional installation and fastening modes, the method is more reliable, effective and reliable.
Drawings
FIG. 1 is a schematic view of the mounting structure of the fixing device of the present invention;
FIG. 2 is a schematic view of the valve seat after installation;
FIG. 3 is a schematic illustration of the numbering of threaded holes in a valve seat.
1-a first fixing member; 2-a second fixing member; 3-a valve body; 4-valve seat; 5-valve seat fastening bolts; 6-adjusting the gasket.
Detailed Description
The invention will be described in further detail with reference to the drawings and the detailed description.
The fixing device for precisely installing the valve seat comprises a plurality of groups of first fixing pieces 1 and second fixing pieces 2 which are matched with each other, wherein each first fixing piece sequentially comprises a first threaded connection part, an extension shaft and a first operation part which are connected with a threaded hole of a valve body 3, and a first connection table is arranged at one end of each first threaded connection part, which is connected with the extension shaft; the second mounting is including the second threaded connection portion, the second operating portion of 3 screw holes of simultaneous connection valve body and disk seat 4 screw holes, just the second mounting is equipped with the cooperation the central through-hole of extension axle, second threaded connection portion keeps away from the one end of second operating portion is equipped with the cooperation the second connection platform of first connection platform, the external diameter of first threaded connection portion is the same with second threaded connection portion. The first and second connection stations have mating tapered surfaces.
The use principle is as follows: the valve seat is installed in the valve body through the first threaded connection parts of the valve seat, the valve seat is installed in the valve body, the extending shaft of the first fixing part just penetrates through the threaded hole of the valve seat, the second fixing part is sleeved on the extending shaft of the first fixing part and is screwed into the valve seat and the valve body in sequence through the second threaded connection parts of the second fixing part until the conical surfaces of the first connection table and the second connection table are tightly attached, the positioning of the valve seat and the valve body is completed at the moment, the valve seat fastening bolt is screwed into other threaded holes subsequently, the first fixing part and the second fixing part are detached finally, the valve seat fastening bolt is screwed into the disassembled threaded holes, and the accurate installation of the valve seat is completed. The device not only plays a role in accurate centering between the valve seat and the valve body, but also plays a role in bearing the valve seat because the valve seat is in a vertical state, and avoids the situation that the valve seat is deflected due to gravity. In addition, at least 3 sets of fixing members, such as three trisection points respectively provided at 0 °, 120 °, 240 °, i.e., right upper, lower left, and lower right, or 4 sets of fixing members, such as four points respectively provided at 0 °, 90 °, 180 °, 270 °, i.e., right upper, lower right, left, and right, are required to be employed in order to secure positioning accuracy and stability. The neutral can be further ensured by measurement during the installation process, and adjustment can be performed by adding gaskets and the like.
The invention also provides a method for precisely installing the valve seat, which adopts the fixing device for precisely installing the valve seat and comprises the following steps:
step 1, four first fixing pieces 1 are respectively arranged in four threaded holes of the valve body 3, namely, right upper threaded holes, right lower threaded holes, right left threaded holes and right threaded holes;
step 2, installing the valve seat 4 into the valve body 3, and placing an adjusting gasket 6 between the lowest part of the valve seat 4 and the valve body; the thickness of the adjusting gasket 6 is half of the difference between the outer diameter of the valve seat 4 and the inner diameter of the valve seat installation guide hole in the valve body 3;
step 3, respectively measuring gaps at the right upper, right lower, right left and right positions between the outer edge of the valve seat 4 and the side wall of the valve seat installation guide hole in the valve body 3, ensuring that the gaps are the same everywhere, and if the gaps are deviated, balancing the gap difference value by arranging an adjusting gasket 6;
step 4, sleeving four second fixing pieces 2 on the first fixing piece 1 respectively, and installing the four second fixing pieces in four threaded holes of the valve body 3 and the valve seat 4;
step 5, sequentially installing valve seat fastening bolts 5 into the rest threaded holes on the valve seat 4 and the valve body 3;
step 6, sequentially removing the four groups of first fixing pieces 1 and second fixing pieces 2, and installing valve seat fastening bolts 5 in corresponding threaded holes;
step 7, fastening all valve seat fastening bolts 5 to the prescribed moment value.
Specifically, all threaded holes on the valve body and/or the valve seat are numbered and marked in a crisscross method, and simultaneously the threaded holes in four positions, namely, the right upper position, the right lower position, the right left position and the right position are marked in an emphasized manner. Of course, if only the threaded hole in the valve body is numbered and marked, it is necessary to ensure that the mark is not obscured by the valve seat after installation. The crisscross mode is to take four threaded holes as a group, the four threaded holes of each group are spaced by 90 degrees, and every two threaded holes are positioned on opposite sides according to the numbering sequence, and a valve body with 16 threaded holes is taken as an example in reference to fig. 3. The subsequent operation of installing the fixing piece or the valve seat fastening bolt is quicker through numbering, and meanwhile, the stress uniformity of the valve seat can be ensured according to the crossed sequence installation, so that the improvement of the installation accuracy is facilitated. The positions of the heavy marks (numbered 1-4 in fig. 3) are the positions for installing the fixing pieces, so that the indicating performance is higher, and the installation is not easy to make mistakes.
As described above, the first and second fixtures are installed, and the valve seat fastening bolts are installed and fastened in the order of the screw hole numbers. In order to improve the installation effectiveness, can ensure the atress homogeneity of disk seat simultaneously, improve the installation accuracy.
In addition, the steps 4 and 5 further include: and taking out all the adjusting gaskets. After accurate location, the adjustment gasket can be taken out to avoid causing the influence to the normal use of valve.
Finally, the step 7 further includes: and measuring gaps at the right upper, right lower, right left and right positions between the outer edge of the valve seat and the side wall of the valve seat mounting hole in the valve body again, and if the gaps are the same at all positions, performing subsequent valve mounting operation. This step is intended to ensure the accuracy of the installation and if errors occur due to operational errors or other factors, adjustments or reinstallations are required to avoid affecting the tightness of the valve.
The foregoing is merely a preferred embodiment of the present invention, which is based on one implementation of the overall concept of the present invention, and the scope of the present invention is not limited thereto, and any changes or substitutions easily contemplated by those skilled in the art within the technical scope of the present invention should be covered by the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.
Claims (9)
1. The method for precisely installing the valve seat is characterized by comprising a fixing device for precisely installing the valve seat, wherein the fixing device comprises a plurality of groups of first fixing pieces and second fixing pieces which are matched with each other, the first fixing pieces sequentially comprise a first threaded connection part, an extension shaft and a first operation part, the first threaded connection part is connected with a threaded hole of a valve body, and one end of the first threaded connection part, which is connected with the extension shaft, is provided with a first connection table; the second fixing piece comprises a second threaded connection part and a second operation part which are simultaneously connected with the valve body threaded hole and the valve seat threaded hole, the second fixing piece is provided with a central through hole matched with the extension shaft, one end of the second threaded connection part far away from the second operation part is provided with a second connection table matched with the first connection table, and the outer diameters of the first threaded connection part and the second threaded connection part are the same;
the method comprises the following steps:
step 1, four first fixing pieces are respectively arranged in four threaded holes of the valve body, namely, the upper part, the lower part, the right left part and the right part;
step 2, mounting the valve seat into the valve body, and placing an adjusting gasket between the lowest part of the valve seat and the valve body;
step 3, respectively measuring gaps at the right upper, right lower, right left and right positions between the outer edge of the valve seat and the side wall of the valve seat installation guide hole in the valve body, ensuring that the gaps are the same everywhere, and if the gaps have deviation, balancing the gap difference value by arranging an adjusting gasket;
step 4, respectively sleeving the four second fixing pieces on the first fixing pieces, and installing the four second fixing pieces in the four threaded holes of the valve body and the valve seat;
step 5, sequentially installing valve seat fastening bolts into the valve seat and the rest threaded holes on the valve body;
step 6, sequentially removing the four groups of first fixing pieces and second fixing pieces, and installing valve seat fastening bolts in corresponding threaded holes;
and 7, fastening all valve seat fastening bolts to a specified moment value.
2. The method for precise installation of a valve seat of claim 1, wherein the first and second connection stations have mating tapered surfaces.
3. The method for precise installation of a valve seat according to claim 1, wherein the thickness of the adjusting shim is half of the difference between the outer diameter of the valve seat and the inner diameter of a valve seat installation guide hole in the valve body.
4. The method for precise installation of a valve seat according to claim 1, further comprising, prior to step 1: all threaded holes on the valve body and/or the valve seat are numbered and marked in a crisscross method mode, and simultaneously the threaded holes in the four positions of the right upper position, the right lower position, the right left position and the right position are marked with emphasis.
5. The method for precise installation of a valve seat of claim 4, wherein the first and second fixtures are installed in sequence of threaded hole numbers.
6. The method for precise installation of a valve seat according to claim 4, wherein the installation of the valve seat fastening bolts is performed in the sequence of screw hole numbers.
7. The method for precise valve seat installation according to claim 4, wherein the fastening of all valve seat fastening bolts to the prescribed torque value is performed in the sequence of screw hole numbers.
8. The method for precise installation of a valve seat according to claim 1, further comprising, between step 4 and step 5: and taking out all the adjusting gaskets.
9. The method for precise installation of a valve seat according to claim 1, further comprising, after the step 7: and measuring gaps at the right upper, right lower, right left and right positions between the outer edge of the valve seat and the side wall of the valve seat mounting hole in the valve body again, and if the gaps are the same at all positions, performing subsequent valve mounting operation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201910542343.3A CN110118267B (en) | 2019-06-21 | 2019-06-21 | Fixing device and method for precisely installing valve seat |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910542343.3A CN110118267B (en) | 2019-06-21 | 2019-06-21 | Fixing device and method for precisely installing valve seat |
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| CN110118267A CN110118267A (en) | 2019-08-13 |
| CN110118267B true CN110118267B (en) | 2024-02-27 |
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| CN201910542343.3A Active CN110118267B (en) | 2019-06-21 | 2019-06-21 | Fixing device and method for precisely installing valve seat |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110970328B (en) * | 2019-11-18 | 2022-06-07 | 长江存储科技有限责任公司 | Sealing ring installation jig and installation method |
| CN112719826B (en) * | 2020-12-03 | 2022-09-20 | 中广核核电运营有限公司 | Butterfly valve clack dismounting device and method |
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| KR100631756B1 (en) * | 2005-04-11 | 2006-10-12 | 전병규 | Virtual assembling machine of rivet bolt |
| CN202091608U (en) * | 2010-12-31 | 2011-12-28 | 深圳深爱半导体股份有限公司 | Pneumatic water valve |
| CN105465401A (en) * | 2015-12-31 | 2016-04-06 | 宁波丰基特种阀门有限公司 | Ball valve easy to replace valve seat |
| CN210141335U (en) * | 2019-06-21 | 2020-03-13 | 三门核电有限公司 | Fixing device for accurate installation of valve seat |
-
2019
- 2019-06-21 CN CN201910542343.3A patent/CN110118267B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100631756B1 (en) * | 2005-04-11 | 2006-10-12 | 전병규 | Virtual assembling machine of rivet bolt |
| CN202091608U (en) * | 2010-12-31 | 2011-12-28 | 深圳深爱半导体股份有限公司 | Pneumatic water valve |
| CN105465401A (en) * | 2015-12-31 | 2016-04-06 | 宁波丰基特种阀门有限公司 | Ball valve easy to replace valve seat |
| CN210141335U (en) * | 2019-06-21 | 2020-03-13 | 三门核电有限公司 | Fixing device for accurate installation of valve seat |
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| CN110118267A (en) | 2019-08-13 |
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