CN113324751A - Online maintenance clamp and device for pneumatic regulating valve - Google Patents
Online maintenance clamp and device for pneumatic regulating valve Download PDFInfo
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- CN113324751A CN113324751A CN202110524068.XA CN202110524068A CN113324751A CN 113324751 A CN113324751 A CN 113324751A CN 202110524068 A CN202110524068 A CN 202110524068A CN 113324751 A CN113324751 A CN 113324751A
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- 238000012423 maintenance Methods 0.000 title claims abstract description 56
- 230000001105 regulatory effect Effects 0.000 title claims abstract description 36
- 230000008878 coupling Effects 0.000 claims abstract description 20
- 238000010168 coupling process Methods 0.000 claims abstract description 20
- 238000005859 coupling reaction Methods 0.000 claims abstract description 20
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 12
- 230000006978 adaptation Effects 0.000 claims description 5
- 210000001503 joint Anatomy 0.000 claims description 5
- 238000009434 installation Methods 0.000 abstract description 4
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- 238000013461 design Methods 0.000 description 2
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- 230000008859 change Effects 0.000 description 1
- 238000005253 cladding Methods 0.000 description 1
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- 210000004907 gland Anatomy 0.000 description 1
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- 238000010248 power generation Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
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Abstract
The invention discloses an online maintenance clamp for a pneumatic regulating valve, which comprises: a yoke clamp assembly, the yoke clamp assembly including a connecting screw; link to each other with connecting screw for fasten respectively with the middle subassembly of spacing valve body pneumatic rod and shaft coupling, middle subassembly includes: the valve body comprises a middle piece body, a first semicircular clamping piece convexly arranged at one end part of the middle piece body, and a convex position and lower limit adjusting bolt convexly arranged on the middle piece body and used for clamping and limiting a coupling of the valve body, wherein the position of the lower limit adjusting bolt relative to the middle piece body is adjustable; and the second semicircular ring clamping piece is matched and connected with the first semicircular ring clamping piece. The invention also discloses an online maintenance device for the pneumatic regulating valve. The online maintenance clamp and the online maintenance device for the pneumatic regulating valve can fix the valve to the current opening degree for online maintenance; the structure is reliable, the installation and the disassembly are simple, the carrying is convenient, and the loss of generated energy caused by the valve maintenance can be effectively prevented.
Description
Technical Field
The invention relates to the field of nuclear power appliances, in particular to an online maintenance clamp and device for a pneumatic regulating valve.
Background
In the prior art, a main water supply regulating valve ARE031/032/033VL of a nuclear power station undertakes the water level regulating function of a steam generator under a high-load operation condition, and a bypass regulating valve is used in a low-load and start-stop stage. The main water supply regulating valve is controlled by a reactor protection system, the valve is closed in a fault, and the reactor protection can respond immediately, if the intervention is not timely, the unit can be caused to jump under a severe condition, and the device is a CCM1 device.
The main water supply regulating valve is a pneumatic regulating valve which is closed after air is lost, and if major defects such as serious air leakage of a pneumatic head occur under a high-load working condition, the load is reduced to an ARE bypass valve to control a steam water level device or the machine is stopped to disassemble and overhaul the pneumatic head of the valve, so that the generating capacity of a unit is lost.
In addition, the existing main water supply regulating valve for the nuclear power station is maintained as follows:
1. the field space is narrow, and parts such as a coupling nut, a coupling boss, a locator feedback arm, a packing gland, a yoke and a valve body connecting bolt are avoided; the instrument control accessories cannot be removed;
2. if instrument control accessories are removed, the valve must be re-identified (fully opened and fully closed) after maintenance, but the valve is not allowed to be opened and closed in a large degree in actual online maintenance, so the design of the tool must ensure that the accessories such as an instrument control positioner and the like are not removed and the original state is maintained;
3. the problem that the difficulty of processing the valve fault is high and the like can be found under different powers of the unit (namely different opening degrees of the valve).
Disclosure of Invention
The invention aims to solve the technical problem of providing an online maintenance clamp and device for a pneumatic regulating valve, which can fix a valve to the current opening degree for online maintenance; the structure is reliable, the installation and the disassembly are simple, the carrying is convenient, and the loss of generated energy caused by the valve maintenance can be effectively prevented.
In order to solve the above technical problem, an embodiment of the present invention provides an online maintenance fixture for a pneumatic control valve, which is adapted to be fastened to a valve body of a main water supply control valve of a nuclear power plant, and is configured to receive a downward force provided by a pneumatic head spring in the valve body, an upward force provided by a medium pressure, and a rotation force for removing a center nut of a diaphragm, and includes: a yoke clamp assembly for clamping to the pneumatic head yoke of the valve body, the yoke clamp assembly including a connecting screw; link to each other with connecting screw for fasten respectively with the middle subassembly of spacing valve body pneumatic rod and shaft coupling, middle subassembly includes: the valve comprises a middle piece body, a first semicircular clamping piece convexly arranged at one end part of the middle piece body, a convex position convexly arranged on the middle piece body and used for clamping and limiting a coupling of a valve body, and a lower limiting adjusting bolt connected to the middle piece body and capable of being adjusted according to the requirement of the opening degree of the valve, wherein the position of the lower limiting adjusting bolt relative to the middle piece body is adjustable; and link to each other with first semicircle ring fastener adaptation for carry out the second semicircle ring fastener that the card was held to the pneumatic rod of valve body, wherein: the online maintenance clamp of the pneumatic regulating valve is fastened on the pneumatic head yoke through a yoke clamping assembly; the coupler of the valve body is assembled and clamped through the convex position, so that the coupler is limited; and locking the middle assembly on a connecting screw rod of the yoke clamping assembly, and adjusting the lower limit adjusting bolt to a proper position according to the opening degree of the valve.
Wherein, the end angle position of middleware body is equipped with and is used for locking the locking hole of middle part subassembly locking on connecting screw, wherein: the connecting screw rod is screwed with a first nut, penetrates through the middle piece body through the locking hole and is screwed with a second nut, and the middle piece body is clamped between the first nut and the second nut.
Wherein, the lower limit adjusting bolt is rotated to ensure that the lower end of the lower limit adjusting bolt is tightly attached to the valve cover of the valve body.
Wherein, first semicircle ring fastener and second semicircle ring fastener butt joint assembly make the cladding in the periphery of valve body pneumatic rod.
Wherein, a clearance of 1mm is arranged between the first semicircular ring clamping piece and the second semicircular ring clamping piece.
Wherein the yoke clamp assembly comprises: can install first clamp plate and the second clamp plate on connecting screw respectively, wherein: and a third nut is screwed on the connecting screw rod, the connecting screw rod passes through the first clamping plate and the second clamping plate, a fourth nut is screwed on the connecting screw rod, and the pneumatic head yoke of the valve body is clamped between the first clamping plate and the second clamping plate.
Wherein, the cross-section of first clamp plate is the H type.
Wherein, the pneumatic rod of valve body links to each other with the one end fastening of the shaft coupling of valve body, and the relative other end fastening of the shaft coupling of valve body is connected with the valve rod of valve body.
In order to solve the technical problem, the invention also discloses an online maintenance device for the pneumatic regulating valve, which comprises an online maintenance clamp for the pneumatic regulating valve, wherein the online maintenance clamp for the pneumatic regulating valve comprises the online maintenance clamp for the pneumatic regulating valve.
The online maintenance clamp and the online maintenance device for the pneumatic regulating valve, provided by the invention, have the following beneficial effects: the online maintenance clamp of the pneumatic regulating valve is fastened on the pneumatic head yoke through a yoke clamping assembly; the coupler of the valve body is assembled and clamped through the convex position, so that the coupler is limited; locking the intermediate assembly on the connecting screw of the yoke clamping assembly, adjusting the lower limit adjusting bolt to a proper position according to the opening degree of the valve, wherein: the yoke clamping component of the clamp can provide upward and downward friction force respectively by matching with the lower limit adjusting bolt; the first semicircular clamping piece and the second semicircular clamping piece are assembled in a butt joint mode, so that the periphery of the valve body pneumatic rod and the limitation of the valve coupler of the intermediate piece assembly are coated to provide anti-torsion torque, and the clamp can fix the valve to the current opening degree for online maintenance in actual maintenance application; the structure is reliable, the installation and the disassembly are simple, the carrying is convenient, and the loss of generated energy caused by the valve maintenance can be effectively prevented.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of a pneumatic regulator valve setting position according to an embodiment of the present invention.
FIG. 2 is a schematic structural diagram of an online maintenance fixture for a pneumatic control valve according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-2, a first embodiment of the online maintenance fixture for a pneumatic control valve according to the present invention is shown.
The online anchor clamps of overhauing of pneumatic control valve in this embodiment can regard as the online partly of overhauing the device of pneumatic control valve, fixes the valve in the demand aperture carries out pneumatic head disintegration and overhauls, and pneumatic control valve overhauls anchor clamps on line can the adaptation fastening on nuclear power plant owner's feed water regulating valve's valve body, and the online anchor clamps of overhauing of movable control valve's effect is: bear the interior pneumatic head spring of valve body and provide the power of making progress and demolish the revolving force of diaphragm center nut that provides down power, medium pressure, can realize fixing the valve to current aperture and carry out online maintenance.
When specifically implementing, pneumatic control valve overhauls anchor clamps on line and includes: a yoke clamping assembly for clamping on the pneumatic head yoke of the valve body, the yoke clamping assembly including a connecting screw 11; an intermediate assembly of a pneumatic rod 91 and a coupling 92, associated with the connecting screw 11, for fastening and limiting respectively the valve body 9, the intermediate assembly comprising: the valve comprises an intermediate piece body 21, a first semicircular clamping piece 22 convexly arranged at one end part of the intermediate piece body 21, a convex position 23 convexly arranged on the intermediate piece body 21 and used for clamping and limiting a coupler 92 of a valve body, and a lower limiting adjusting bolt 24 connected to the intermediate piece body 21 and capable of being adjusted according to the requirement of the opening degree of the valve, wherein the position of the lower limiting adjusting bolt 24 relative to the intermediate piece body 21 is adjustable; and the second semicircle ring fastener 3 that links to each other with first semicircle ring fastener 22 adaptation for the pneumatic rod 91 to the valve body is held to the card, wherein: the online maintenance clamp of the pneumatic regulating valve is fastened on the pneumatic head yoke T through a yoke clamping assembly; the coupler 92 of the valve body is assembled and clamped through the convex position 23, so that the coupler 92 is limited; the intermediate assembly is locked to the yoke clamp assembly attachment screw 11 and the lower limit adjustment bolt 24 is adjusted to the appropriate position based on the valve opening.
During specific implementation, pneumatic head yoke T is a structure spare of pneumatic governing valve body, and the structure spare of valve body still includes: pneumatic rod 91, shaft coupling 92 and valve rod 93, during the concrete implementation, the top fastening of pneumatic rod 91 and the shaft coupling 92 of valve body links to each other, and the relative bottom fastening of shaft coupling 92 of valve body has valve rod 93.
Wherein: the pneumatic rod 91 and the valve rod 93 are cylindrical, and the coupling 92 is block-shaped.
Further, the yoke clamp assembly includes: a first clamping plate 12 and a second clamping plate 13 which can be respectively mounted on the connecting screw 11, wherein: a third nut 14 is screwed on the connecting screw 11, the connecting screw 11 passes through the first clamping plate 12 and the second clamping plate 13 and a fourth nut 15 is screwed on the connecting screw 11, and the pneumatic head yoke T of the valve body is clamped between the first clamping plate 12 and the second clamping plate 13.
In this embodiment, the connecting screw 11 is set to 4, the first clamping plate 12 and the second clamping plate 13 are respectively disposed on two opposite sides of the pneumatic head yoke T, and the end angle positions of the first clamping plate 12 and the second clamping plate 13 are respectively provided with screw holes for the connecting screw 11 to pass through. Wherein: the first clamping plate 12 is H-shaped in cross-section.
Further, an intermediate member is connected to the connecting screw 11, which is disposed adjacent to the first clamping plate 12, and in this embodiment, the intermediate member functions to: the pneumatic rod 91 and the coupling 92 of the valve body 9 are fastened and restrained, respectively, providing anti-rotation torque by clamping the pneumatic rod 91 and restraining the coupling 92.
The intermediate assembly includes: the middle part comprises a middle part body 21, a first semicircular ring clamping piece 22, a convex position 23 and a lower limit adjusting bolt 24.
The first semicircular clamping piece 22 is convexly arranged on one side of the end part of the middle piece body 21 and is used for being matched and butted with the second semicircular clamping piece 3 so as to fasten a pneumatic rod of the valve body. Protruding position 23 is protruding to be established on middleware body 21, sets up at protruding homonymy of establishing first semicircle fastener 22 one side, and its effect is: the coupling 92 of the valve body is clamped and limited. During assembly, the protruding portions 23 are arranged at upper, lower, front and rear positions of the coupling 92, and are connected by screw connection, bolt connection, and the like.
The lower limit adjusting bolt 24 is connected to the bottom of the middle piece body 21, and is rod-shaped, and the lower limit adjusting bolt 24 functions as: the position adjustment is performed according to the opening requirement of the valve body valve, that is, the position of the lower limit adjusting bolt 24 relative to the intermediate member body 21 is set to be adjustable, thereby providing force to the valve body. For example, the lower end of the lower limit adjustment bolt 24 can be brought into close contact with the bonnet of the valve body by rotating the lower limit adjustment bolt.
Further, locking holes may be provided at the corner positions of the intermediate member body 21 to lock the intermediate member to the connecting screw 11. Wherein: the first nut 16 is screwed on the connecting screw 11, the connecting screw 11 passes through the intermediate member body 21 through the locking hole and the second nut 17 is screwed on the connecting screw 11, and the intermediate member body 21 is clamped between the first nut 16 and the second nut 17.
The second semicircular ring fastener 3 has the following functions: and the first semicircular clamping piece 22 is assembled in a butt joint mode, so that the whole body can be coated on the periphery of the valve body pneumatic rod 91, and an anti-rotation moment is provided.
Preferably, a clearance of 1mm is arranged between the first semicircular ring clamping piece and the second semicircular ring clamping piece.
When the pneumatic control valve online maintenance clamp in the embodiment is specifically assembled, firstly, the lower limit adjusting bolt 24 is screwed to the uppermost, the third nut 14 is screwed on the connecting screw rod 11, the first clamping plate 12 and the second clamping plate 13 are respectively arranged at two sides of the pneumatic head yoke T, after the connecting screw rod 11 sequentially passes through the locking holes on the first clamping plate 12 and the second clamping plate 13, the fourth nut 15 is screwed on the connecting screw rod 11, and the pneumatic head yoke T is clamped between the first clamping plate 12 and the second clamping plate 13. Simultaneously, the first nut 16 is screwed on the connecting screw 11, and after the connecting screw 11 passes through the locking hole of the intermediate member body 21, the second nut 17 is screwed on the connecting screw 11, so that the intermediate member body 21 is sandwiched between the first nut 16 and the second nut 17.
Next, the second semicircular clip member 3 is butt-jointed to the first semicircular clip member 22, so that the whole can be wrapped around the valve body pneumatic rod 91. After the relative positions of all the components are adjusted, the two semicircular clamping pieces 22 and 3 are fastened to prevent the two semicircular clamping pieces from rotating on the pneumatic rod 91; a large torque is applied to the third nut 14 and the fourth nut 15, so that the clamping of the yoke T is ensured; the first nut 16 and the second nut 17 are tightened, taking care not to apply a large torque, preventing the pneumatic rod 91 from being subjected to large lateral forces.
Finally, after the clamp is installed, the lower limit adjusting bolt 24 is rotated until the lower end of the lower limit adjusting bolt is attached to the valve cover according to the opening degree of the valve.
When the online maintenance clamp for the pneumatic regulating valve in the embodiment is implemented specifically, the force borne by the online maintenance clamp is as follows:
1. a downward force provided by a pneumatic head spring in the valve body;
when the unit is in full power operation, the valve opening is about 60%, the air supply pressure is 1.5bar.g, and the diaphragm sealing diameter is 628 mm. Namely, the spring force is:
f1 (effective diaphragm area (pi/4 (6282)) 46000N (air supply pressure) (0.15) — 46000N
At full power the valve opening is at a maximum and the spring force is at a maximum, i.e. the maximum downward force provided by the spring is 46000N.
2. Upward force, caused by system media pressure;
the spool is a balanced spool, the unbalanced area is mainly provided by the valve stem, i.e. the system provides an upward force:
f2 system pressure valve stem area (pi/4 25.42) 4000N
This formula does not take into account the downward packing friction, i.e., F2 is actually less than 4000N.
3. The force of rotation, disintegration change diaphragm need elasticity center nut, nut moment 350 N.m.
The online maintenance fixture for the pneumatic control valve in the embodiment provides the following forces during working:
1. the friction force provided by the assembled yoke clamping assembly is tested on site, under the condition that the valve is 60% open, the clamp can limit the position under the condition that the lower limit adjusting bolt 24 is not in effect, and the upward friction force f1 and the downward friction force f2 provided by the clamp are as follows:
f1＝f2＞F1＝46000N
2. the adjusting bolt 24(2 sets) provides an upward force at the lower limit:
f3 yield strength (640) 0.7 bolt area (pi/4 122) 2 100000N
3. The butt assembly of the second semicircular ring fastener 3 and the first semicircular ring fastener 22 provides an anti-rotation moment M which is larger than 350N.m for the clamping of the pneumatic rod 91 and the limitation of the middle component to the coupler 92.
Thus, the tool can provide an upward force of F3+ F1 > 146000N > spring force F1-46000N; the tool can provide a downward force of F2 46000N > system force F2 4000N; the tool can provide an anti-rotation moment M larger than 350 N.m.
In conclusion, the online maintenance clamp tool for the pneumatic regulating valve in the embodiment has the advantages of small volume and light weight; the number of parts is small, and new people without work experience can independently complete disassembly and assembly; the valve can be fixed at different required opening degrees by rotating the adjusting bolt; the valve can be overhauled under the condition that the valve positioner (connected to the valve coupler) is not dismounted, so that the valve positioner does not need to be identified again; the water level of the evaporator needs to be adjusted to the original opening after the valve is overhauled, and the valve needs to be fully opened and fully closed after being identified; this also enables the tool to be used in actual service.
In addition, the applicant has applied the fixture to the temporary stop period of the unit No. 4 along the red river, and the tool is used for carrying out simulated on-line (APD water supply) maintenance on the 4ARE033VL, so that the work of disassembling the pneumatic head of the valve and replacing the diaphragm is smoothly completed, and the valve is always maintained at the original opening degree in the whole process. Because the locator does not need to be dismantled in the tool design, the valve does not need to be identified again, and all parameters of the valve are detected after the valve is restored automatically and basically consistent with the parameters before dismantling.
The online maintenance clamp for the pneumatic regulating valve in the embodiment can bring the following economic effects, for example: without the tool, the power of the pneumatic head of the split ARE main water supply regulating valve needs to be reduced by at least about 800MW, the valve maintenance time needs to be at least 14 hours, and the time for increasing and reducing the power is not included. Thus, each overhaul can recover at least about 800000 x 14 x 0.4 to 448 ten thousand dollars of economic loss due to the reduction in power generation.
The invention also discloses a pneumatic control valve online maintenance device with the pneumatic control valve online maintenance clamp, the specific implementation mode of the pneumatic control valve online maintenance device is the same as that of the pneumatic control valve online maintenance clamp, and the detailed description is omitted here.
The online maintenance clamp and the online maintenance device for the pneumatic regulating valve have the following beneficial effects that: the online maintenance clamp of the pneumatic regulating valve is fastened on the pneumatic head yoke through a yoke clamping assembly; the coupler of the valve body is assembled and clamped through the convex position, so that the coupler is limited; locking the intermediate assembly on the connecting screw of the yoke clamping assembly, adjusting the lower limit adjusting bolt to a proper position according to the opening degree of the valve, wherein: the yoke clamping component of the clamp can provide upward and downward friction force respectively by matching with the lower limit adjusting bolt; the first semicircular clamping piece and the second semicircular clamping piece are assembled in a butt joint mode, so that the periphery of the valve body pneumatic rod and the limitation of the valve coupler of the intermediate piece assembly are coated to provide anti-torsion torque, and the clamp can fix the valve to the current opening degree for online maintenance in actual maintenance application; the structure is reliable, the installation and the disassembly are simple, the carrying is convenient, and the loss of generated energy caused by the valve maintenance can be effectively prevented.
Claims (9)
1. The utility model provides a pneumatic control valve overhauls anchor clamps on line, the adaptation fastening is on nuclear power plant owner's feed water governing valve's valve body for bear the interior pneumatic head spring of valve body provide to do all can and demolish the revolving force of diaphragm center nut downwards, the power that makes progress that medium pressure provided, its characterized in that includes:
a yoke clamp assembly for clamping to a pneumatic head yoke of the valve body, the yoke clamp assembly including a connecting screw;
with connecting screw links to each other for fasten respectively with the intermediate subassembly of spacing valve body pneumatic rod and shaft coupling, the intermediate subassembly includes: the valve comprises a middle piece body, a first semicircular clamping piece convexly arranged at one end part of the middle piece body, a convex position convexly arranged on the middle piece body and used for clamping and limiting a coupler of a valve body, and a lower limiting adjusting bolt connected to the middle piece body and capable of being adjusted according to the requirement of the opening degree of the valve, wherein the position of the lower limiting adjusting bolt relative to the middle piece body is adjustable; and
with first semicircle ring fastener adaptation links to each other for carry out the second semicircle ring fastener that the card was held to the pneumatic rod of valve body, wherein:
the online maintenance clamp of the pneumatic regulating valve is fastened on the pneumatic head yoke through a yoke clamping assembly;
the coupler of the valve body is assembled and clamped through the convex position, so that the coupler is limited;
and locking the middle assembly on the connecting screw rod of the yoke clamping assembly, and adjusting the lower limit adjusting bolt to a proper position according to the opening degree of the valve.
2. The pneumatic regulator valve online service fixture of claim 1, wherein the intermediate member body is provided at an end corner position with a locking hole for locking the intermediate member to the connecting screw, wherein: and a first nut is screwed on the connecting screw rod, the connecting screw rod passes through the intermediate piece body through the locking hole and screws a second nut on the connecting screw rod, and the intermediate piece body is clamped between the first nut and the second nut.
3. The pneumatic adjustment valve online maintenance fixture according to claim 1 or 2, wherein the lower limit adjustment bolt is rotated such that a lower end thereof is closely attached to a valve cover of the valve body.
4. The pneumatic regulating valve online maintenance fixture of claim 1, wherein the first semi-circular ring fastener and the second semi-circular ring fastener are assembled in a butt joint manner so as to cover the outer periphery of the pneumatic rod of the valve body.
5. The pneumatic regulator valve online service fixture of claim 4, wherein a 1mm gap is provided between the first semi-circular ring fastener and the second semi-circular ring fastener.
6. The pneumatic regulator valve online service fixture of claim 1, wherein the yoke clamp assembly comprises: can install respectively connect first clamp plate and second clamp plate on the screw rod, wherein: and a third nut is screwed on the connecting screw rod, the connecting screw rod passes through the first clamping plate and the second clamping plate and a fourth nut is screwed on the connecting screw rod, and a pneumatic head yoke of the valve body is clamped between the first clamping plate and the second clamping plate.
7. The pneumatic regulator valve online service fixture of claim 6, wherein the first clamping plate is H-shaped in cross-section.
8. The pneumatic regulating valve online maintenance fixture of claim 1, wherein the pneumatic rod of the valve body is fixedly connected with one end of the coupling of the valve body, and the valve rod of the valve body is fixedly connected with the other end of the coupling of the valve body.
9. An online maintenance device for a pneumatic regulating valve, which comprises an online maintenance clamp for the pneumatic regulating valve, and is characterized in that the online maintenance clamp for the pneumatic regulating valve comprises the online maintenance clamp for the pneumatic regulating valve according to any one of claims 1 to 8.
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| CN202110524068.XA CN113324751B (en) | 2021-05-13 | 2021-05-13 | Online maintenance clamp and device for pneumatic regulating valve |
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| CN202110524068.XA CN113324751B (en) | 2021-05-13 | 2021-05-13 | Online maintenance clamp and device for pneumatic regulating valve |
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| CN113324751B CN113324751B (en) | 2024-07-12 |
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2021
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| Title |
|---|
| 陈路标;肖付伟;: "核电厂汽轮发电机主调节阀开度限值修改分析", 电工技术, no. 16, 25 August 2020 (2020-08-25) * |
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| CN113324751B (en) | 2024-07-12 |
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