CN109955026A - One kind being used for nuclear leve gate valve plate sealing surface renovation technique - Google Patents
One kind being used for nuclear leve gate valve plate sealing surface renovation technique Download PDFInfo
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- CN109955026A CN109955026A CN201711404401.3A CN201711404401A CN109955026A CN 109955026 A CN109955026 A CN 109955026A CN 201711404401 A CN201711404401 A CN 201711404401A CN 109955026 A CN109955026 A CN 109955026A
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- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
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Abstract
The invention belongs to the maintenance technique fields of presurized water reactor reactor core internals, nuclear leve gate valve plate sealing surface renovation technique is used for more particularly to one kind, purpose is to design one kind for nuclear leve gate valve plate sealing surface renovation technique, is repaired because grinding, burn into crackle etc. lead to the not available valve plate of gate valve.The invention can ensure that valve plate angle and former valve plate are almost the same after second of turning, it can effective controllers close contact valve plate to be repaired, the irradiation dose of reduction personnel, test can also being printed by valve plate angle measurement meter color, double verification is carried out to valve plate angle, be heat-treated simultaneously by heat treatment electric furnace for field conduct, both meet heat treatment simultaneously can effective controllers irradiation dose.
Description
Technical field
The invention belongs to the maintenance technique fields of presurized water reactor reactor core internals, and in particular to one kind is used for nuclear leve gate valve
Sealing surface of valve plate renovation technique.
Background technique
I ring hot arc is to stopping isolating valve V08-01A before cold inlet tube after 300,000 unit OT115 and OT116 overhaul of Qinshan
There is different degrees of interior leakage, pressure boundary of primary Ioops is caused to be destroyed.Overhauling investigation discovery by history should
For valve because of " dead pipeline section " effect, the effective sealing surface of valve plate is very thin, therefore repairs and propose one kind for nuclear leve gate valve valve at one
Plate sealing surface renovation technique, it is therefore an objective to which reparation has been approached the nuclear leve gate valve plate scrapped, and repair process flow is probably as follows:
1, the relevant information of Awaiting Overhaul valve is collected, including valve mechanism, the information such as material of valve plate and matrix, according to repairing
Skill of returning to work combination relevant materials write processing step technological document；
2, disintegrate valve to be repaired, measures valve plate and angle of valve seat using three-dimensional measurement technology, uses general gage measuring
Sealing surface of valve plate width, inside and outside ring diameter equidimension；
3, valve plate is fixed on chuck special ad hoc in this renovation technique, adjustment chuck angle is that valve plate waits for that turning is close
Cover is in level, and the chuck special for fixing valve plate is installed and carries out turning to lathe and records Lathe quantity, is completed to turning
Valve plate carry out penetration inspection confirm valve plate substrate zero defect；
4, the valve plate that turning is completed is put and carries out pre-welding heat treatment into the electric furnace of customization；
5, install again to chuck special after the completion of valve plate pre-welding heat treatment, by chuck special be fixed on customization it is equal from
Subarc welds on the positioner of automatic bead welding equipment configuration, and valve plate is made to be in horizontality.It is realized by adjusting controller parameter
The autorotation speed of positioner, transverse and longitudinal mobile device are in lateral flutter rate and control, powder sending quantity, welding current, striking etc.
Parameter is adjusted by parameter and realizes the uniform of sealing surface of valve plate built-up welding；
6, the valve plate that built-up welding is completed is put and carries out post weld heat treatment into the electric furnace of customization；
7, the valve plate that heat treatment is completed is fixed on chuck special, then chuck is fixed on the vehicle on lathe according to early period
The amount of cutting, built-up welding amount carry out turning, and penetration inspection is carried out after the completion of turning, confirm sealing surface zero defect；
8, it is polished after the completion of valve plate turning, then does color print with valve plate and former valve valve seat and test, confirmation color prints line
Clearly continuously without disconnection, Ruo Seyin test result, which is not inconsistent to be fixed on valve plate on lathe, combines color print line trace to carry out valve plate angle
Degree adjustment, until color print line is clearly continuously without disconnection；
9, valve plate is ground, sealing surface of seat returns dress valve.
Summary of the invention
It is a kind of for nuclear leve gate valve plate sealing surface renovation technique the purpose of the present invention is designing, it repairs because of grinding, burn into
Crackle etc. leads to the not available valve plate of gate valve.
The present invention is implemented as follows:
One kind being used for nuclear leve gate valve plate sealing surface renovation technique, specifically comprises the following steps:
Step 1: valve plate is simultaneously moved to service area by disintegration scene valve body to be repaired, uses 3 D measuring instrument, distance measurement
Instrument measures valve plate, valve seat size, grinds valve seat；Valve plate angle measurement uses 3 D measuring instrument contact to acquire sealing surface of valve plate first
Angle between two sealing surface of valve plate is calculated by 3 D measuring instrument and computer software in information；When valve seat relative dimensions measure
Guide rail is first abutted against into sealing surface of seat using distance measurement instrument, sliding pointer makes it be close to sealing surface of seat outer circular edge, takes
Distance measurement instrument carries out double measurement using vernier caliper and records out；
Step 2: valve plate is put on turn plate, adjustment suitable position is simultaneously consolidated valve plate using fixed frame on chuck special
It is scheduled on chuck special turn plate；Rotation hand wheel drives screw rod rotation forces wedge block mobile, when wedge block touches swivel plate,
Since swivel plate is connect with fixed plate by bearing, swivel plate starts to swing, by adjusting by sealing surface of valve plate to be repaired
It is adjusted to horizontality；
Step 3: chuck special fixed plate is fixed on progress sealing surface turning on lathe, the iron filings to turning are by strip
Shape becomes fragment shape and stops turning, removes valve plate after the completion of turning, and chuck special angle must not change at this time, completes to turning
Sealing surface carry out PT and check and qualified；
Step 4: the valve plate after turning is placed in electric furnace and implements pre-welding heat treatment；
Step 5: valve plate is fixed on the matched positioner of plasma arc welding (PAW) automatic surfacing device and is fixed, is passed through
The matched controller of automatic surfacing device is manually adjusted to adjust the speed of rotation of positioner, transverse shifting device and longitudinal movement device
Hunting frequency；Automatic surfacing device is furnished with storing powder box, welding gun, and welding gun is fixed on transverse shifting device, passes through transverse shifting device
Swing realize torch swinging, to realize uniform built-up welding；
Step 6: starting plasma arc welding (PAW) automatic surfacing device comes into effect automatic surfacing；
Step 7: post weld heat treatment is carried out to the valve plate after the completion of built-up welding using electric furnace；
Step 8: the cooling valve plate completed is once again secured on chuck special and is fixed on lathe progress roughing, will
Valve plate appearance is restored to state to be repaired, and Lathe quantity is recorded, and is polished to the valve plate that roughing is completed and measures valve plate sealing
Face import and export width, valve plate angle, on valve plate under distance, flap along range data；PT infiltration is carried out to the valve plate that polishing is completed
It checks thoroughly；
Step 9: measuring the angle of the valve plate after the completion of turning using three-dimensional measuring apparatus, and carries out the print test of valve color,
Combined data and color print test result carry out angle adjustment to valve plate；Valve plate, the valve seat phase of polishing and grinding completion are combined first
Close color print line in the print test of size combination color as a result, calculates the Lathe quantity that need to process of sealing surface of valve plate surrounding, next is by valve plate
It is fixed on lathe and turning is started to the vertical angle of turning surface according to calculated result adjustment；
Step 10: repeating step 8 and step 9 process, until valve color print test result is qualified；
Step 11: dress valve is returned using the valve plate completed is repaired.
Chuck special used in step 2 as described above includes bearing, screw rod, handwheel, turn plate, fixed plate and wedge
Shape block；Turn plate is connect by bearing with fixed plate and realizes rotation, and wherein fixed plate has section to be provided with square groove, wedge block insertion
Square groove and realizing in slot horizontally slips；Screw rod, handwheel are connected through a screw thread in a manner of the dark bar of valve with wedge block, rotate hand
Wheel drives screw rod rotation, realizes that wedge block slides in fixed plate square groove.
Plasma arc welding (PAW) automatic surfacing device used in step 5 as described above include positioner, welding gun, storing powder box,
Transverse shifting device, longitudinal movement device and controller；Positioner is fixed on lower seat, and inside is equipped with motor, is grasped by controller
Make to realize the rotation of positioner upper disk and speed is adjustable；Transverse shifting device, longitudinal movement device are connected by guide rail respectively, are passed through
Controller operation realizes that the automatic transverse and longitudinal of welding gun is mobile.
Distance measurement instrument used in step 1 as described above is made of two guide rails, four lever arms, two pointers,
Pass through rivet interlacement between lever arm and between lever arm and guide rail, and realize rotation, guide rail two sides are equipped with T-slot, pointer dress
Enter T-slot and realizes sliding.
The beneficial effects of the present invention are:
Valve plate turning: needing turning three times altogether in this renovation technique, when turning waits for that the plumbness of turning surface is to utilize hundred
The confirmation of point table, and waited for when second of turning turning surface be it is irregular concavo-convex, dial gauge can not confirm.Therefore for the first time
Using the chuck special of design and valve plate another side as fixed reference when turning, the plumbness to turning surface, turning are confirmed
Keeping chuck angle motionless after the completion is that valve plate angle and former valve plate are almost the same after can guarantee second of turning.
The uniform built-up welding of sealing surface: it is uniform firstly the need of guaranteeing when sealing surface weld deposit, it is automatic by special plasma arc welding (PAW)
Uniform rotation, movement and the control of the positioner and transverse and longitudinal mobile device that design in build-up welding apparatus can guarantee that built-up welding effect is equal
It is even effective.Another band repairs valve plate there may be biggish radioactivity, can be with by the use of plasma arc welding (PAW) automatic bead welding equipment
Effective controllers close contact valve plate to be repaired, reduces the irradiation dose of personnel.
The adjustment of valve plate angle: there may be micro angular deviations after the completion of turning for the valve plate of heap postwelding, so that valve plate
Decline with the matching degree of valve seat, it is therefore desirable to carry out the correction of valve plate angle.It may determine that valve according to the marking that color prints line
The deviation of plate angle degree is specifically caused by certain section of dimensional discrepancy of annular surface.Therefore the survey of size is carried out using dial gauge in turning
Amount, the corresponding Lathe quantity of measurement result are that color prints stria mark clear section and prints line slightly larger than color and obscures section, carry out angle with this
Correction.
Valve plate angle measurement: valve plate angle is measured before valve plate turning to carry out angle school after the completion of the reparation of later period valve plate
The angle of timing is verified.Double verification is carried out to valve plate angle by the print test of valve plate angle measurement meter color.
Valve plate heat treatment: according to qualification of welding procedure content, valve plate before welding after must be heat-treated, but valve plate is deposited
It can not be sent outside in certain irradiation dose, while not meet renovation technique.Therefore by heat treatment electric furnace for field conduct
Heat treatment, both meet heat treatment simultaneously can effective controllers irradiation dose.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of sealing surface of seat and sealing surface of valve plate；
Fig. 2 is the annexation figure of 3 D measuring instrument and valve plate, valve seat；
Fig. 3 is the structural schematic diagram of chuck special；
Fig. 4 is the structural schematic diagram of plasma arc welding (PAW) automatic surfacing device；
Fig. 5 is the structural schematic diagram of distance measurement instrument.
Wherein: 1. valve seats, 2. valve plates, 3. valve bodies, 4. 3 D measuring instrument contacts, 5. 3 D measuring instruments, 6. bearings, 7. spiral shells
Bar, 8. handwheels, 9. turn plates, 10. fixed plates, 11. wedge blocks, 12. positioners, 13. welding guns, 14. storing powder box, 15. laterally move
Dynamic device, 16. longitudinal movement devices, 17. controllers, 18. distance measurement instrument.
Specific embodiment
The present invention is described further with reference to the accompanying drawings and examples.
One kind being used for nuclear leve gate valve plate sealing surface renovation technique, specifically comprises the following steps:
1.1. the 2 sealing surface existing defects of valve plate of high radioactivity nuclear leve gate valve body 3.
1.2. the information such as structure, valve plate body and the sealing surface material of valve to be repaired are collected.
1.3. valve plate body and sealing surface material is combined to write qualification of welding procedure and heat treatment process and pass through audit.
1.4. qualification of welding procedure is combined to prepare corresponding wlding and analogue body.
1.5. implement simplation verification on analogue body according to qualification of welding procedure and heat treatment process and combine simulated operation
Record welding, heat treatment parameter rise version the relevant technologies file.
1.6. as shown in Figure 1, disintegrating scene valve body 3 to be repaired and moves to service area for valve plate 2, as shown in Fig. 2, using
3 D measuring instrument 5, distance measurement instrument 18 measure valve plate 2,1 relative dimensions of valve seat, grind valve seat 1.2 angle measurement of valve plate makes first
2 sealing surface information of valve plate is acquired with 3 D measuring instrument contact 4, is calculated 2 liang of valve plate by 3 D measuring instrument 5 and computer software
Angle between sealing surface.Guide rail is first abutted against 1 sealing surface of valve seat using distance measurement instrument 18 when measuring by 1 relative dimensions of valve seat,
Sliding pointer makes it be close to 1 sealing surface outer circular edge of valve seat, takes out distance measurement instrument using vernier caliper and carries out double measurement simultaneously
Record.
1.7. valve plate 2 is put on turn plate 9, adjustment suitable position is simultaneously consolidated valve plate 2 using fixed frame on chuck special
It is scheduled on chuck special turn plate 9.Rotation hand wheel 8 drives 7 rotation forces wedge block 11 of screw rod mobile, touches and revolves to wedge block
When rotating plate 9, since swivel plate 9 and fixed plate 10 are connect by bearing 6, swivel plate starts to swing, by adjusting will be to be repaired
Multiple 2 sealing surface of valve plate is adjusted to horizontality.
1.8. chuck special fixed plate 10 is fixed on progress sealing surface turning on lathe, the iron filings to turning are by strip
Become fragment shape and stop turning, remove valve plate 2 after the completion of turning, chuck special angle must not change at this time, complete to turning
Sealing surface carry out PT and check and qualified.
1.9. the valve plate 2 after turning is placed in electric furnace according to heat treatment process and implements pre-welding heat treatment.
1.10. valve plate 2 is fixed on the matched positioner 12 of plasma arc welding (PAW) automatic surfacing device and is fixed, passed through
The matched controller 17 of automatic surfacing device is manually adjusted to adjust the speed of rotation of positioner 12, transverse shifting device 15 and longitudinal direction
The hunting frequency of shifter 16.Automatic surfacing device is furnished with storing powder box 14, welding gun 13, and welding gun 13 is fixed on transverse shifting device 15
On, realize that welding gun 13 is swung by the swing of transverse shifting device 15, to realize uniform built-up welding.
1.11. the relative parameters setting in operating process is repaired according to simulation, starts plasma arc welding (PAW) automatic surfacing device
Come into effect automatic surfacing；
1.12. post weld heat treatment is carried out to the valve plate 2 after the completion of built-up welding using electric furnace.
1.13. the cooling valve plate 2 completed is once again secured on chuck special and is fixed on lathe and carry out roughing, by valve
2 appearance of plate is restored to state to be repaired, and Lathe quantity is recorded, and is polished to the valve plate 2 that roughing is completed and measures the sealing of valve plate 2
Face imports and exports width, valve plate angle, on valve plate along data such as distance, flap lower edge distances.PT is carried out to the valve plate 2 that polishing is completed
Penetration inspection.
1.14. the angle of the valve plate 2 after the completion of turning is measured using three-dimensional measuring apparatus 5, and carries out the print test of valve color,
Combined data and color print test result carry out angle adjustment to valve plate 2.Valve plate 2, the valve seat 1 for combining polishing and grinding to complete first
Color print line the as a result, Lathe quantity that need to process of 2 sealing surface surrounding of valve plate is calculated, secondly by valve in the print test of relative dimensions combination color
Plate 2, which is fixed on lathe, starts turning to the vertical angle of turning surface according to calculated result adjustment.
1.15. 1.13 and 1.14 processes are repeated, until valve color print test result is qualified.
1.16. dress valve is returned using the valve plate for repairing completion.
As shown in figure 3, chuck special used in step 1.7 includes bearing 6, screw rod 7, handwheel 8, turn plate 9, fixed plate
10 and wedge block 11.Turn plate 9 is connect by bearing 6 with fixed plate 10 and may be implemented to rotate, and wherein fixed plate 10 has section to open
There is square groove, wedge block 11 is inserted into square groove and can realize in slot and horizontally slips.Screw rod 7, handwheel 8 in a manner of the dark bar of valve with
Wedge block 11 is connected through a screw thread, and rotation hand wheel 8 drives screw rod 7 to rotate, and wedge block 11 may be implemented in 10 square groove of fixed plate
Interior sliding.
As shown in figure 4, plasma arc welding (PAW) automatic surfacing device used in step 1.10 include positioner 12, welding gun 13,
Storing powder box 14, transverse shifting device 15, longitudinal movement device 16 and controller 17.Positioner 12 is fixed on lower seat, and inside is equipped with electricity
Motivation may be implemented 12 upper disk rotation of positioner by the operation of controller 17 and speed be adjustable.Transverse shifting device 15, longitudinal direction
Shifter 16 is connected by guide rail respectively, is operated by controller 17, realizes that the automatic transverse and longitudinal of welding gun 13 is mobile.
As shown in figure 5, the distance measurement instrument 18 that step 1.6 uses is by two guide rails, four lever arms, two pointer sets
At by rivet interlacement between lever arm and between lever arm and guide rail, and can realizing rotation, guide rail two sides refer to equipped with T-slot
Needle, which is packed into T-slot, can realize sliding.
Implementation method of the invention is explained in detail above in conjunction with embodiment, but the present invention is not limited to above-mentioned realities
Example is applied, it within the knowledge of a person skilled in the art, can also be without departing from the purpose of the present invention
Various changes can be made.The content that description in the present invention is not described in detail can use the prior art.
Claims (4)
1. one kind is used for nuclear leve gate valve plate sealing surface renovation technique, specifically comprise the following steps:
Step 1: valve plate (2) is simultaneously moved to service area by scene valve body (3) to be repaired of disintegrating, using 3 D measuring instrument (5),
Valve plate (2), valve seat (1) size are measured away from measuring instrument (18), are ground valve seat (1)；Valve plate (2) angle measurement is surveyed using three-dimensional first
It measures instrument contact (4) and acquires valve plate (2) sealing surface information, valve plate (2) two is calculated by 3 D measuring instrument (5) and computer software
Angle between sealing surface；It is close that valve seat (1) relative dimensions first use distance measurement instrument (18) that guide rail abutted against valve seat (1) when measuring
Cover, sliding pointer make it be close to valve seat (1) sealing surface outer circular edge, and taking-up distance measurement instrument is carried out secondary using vernier caliper
It measures and records；
Step 2: valve plate (2) is put on turn plate (9), adjustment suitable position simultaneously uses fixed frame by valve plate on chuck special
(2) it is fixed on chuck special turn plate (9)；Rotation hand wheel (8) drives screw rod (7) rotation forces wedge block (11) mobile, to
When wedge block touches swivel plate (9), since swivel plate (9) is connect with fixed plate (10) by bearing (6), swivel plate starts
It swings, is adjusted to horizontality by adjusting by valve plate to be repaired (2) sealing surface；
Step 3: chuck special fixed plate (10) is fixed on progress sealing surface turning on lathe, the iron filings to turning are by strip
Shape becomes fragment shape and stops turning, removes valve plate (2) after the completion of turning, chuck special angle must not change at this time, to turning
The sealing surface of completion carries out PT and checks simultaneously qualification；
Step 4: the valve plate (2) after turning is placed in electric furnace and implements pre-welding heat treatment；
Step 5: valve plate (2) being fixed on the matched positioner of plasma arc welding (PAW) automatic surfacing device (12) and is fixed, and is led to
It crosses and manually adjusts the matched controller of automatic surfacing device (17) to adjust the speed of rotation, the transverse shifting device of positioner (12)
(15) and longitudinal movement device (16) hunting frequency；Automatic surfacing device is furnished with storing powder box (14), welding gun (13), and welding gun (13) is solid
It is scheduled on transverse shifting device (15), realizes that welding gun (13) are swung by the swing of transverse shifting device (15), to realize uniform
Built-up welding；
Step 6: starting plasma arc welding (PAW) automatic surfacing device comes into effect automatic surfacing；
Step 7: post weld heat treatment is carried out to the valve plate (2) after the completion of built-up welding using electric furnace；
Step 8: the cooling valve plate (2) completed is once again secured on chuck special and is fixed on lathe progress roughing, by valve
Plate (2) appearance is restored to state to be repaired, and Lathe quantity is recorded, and is polished to the valve plate (2) that roughing is completed and measures valve plate
(2) sealing surface inlet and outlet width, valve plate angle, on valve plate under distance, flap along range data；The valve plate that polishing is completed
(2) PT penetration inspection is carried out；
Step 9: using the angle of the valve plate (2) after the completion of three-dimensional measuring apparatus (5) measurement turning, and the print examination of valve color is carried out
It tests, combined data and color print test result carry out angle adjustment to valve plate (2)；The valve plate for combining polishing and grinding to complete first
(2), in the test of valve seat (1) relative dimensions combination color print color print line as a result, calculating the vehicle that need to process of valve plate (2) sealing surface surrounding
Valve plate (2) is secondly fixed on lathe and starts turning to the vertical angle of turning surface according to calculated result adjustment by the amount of cutting；
Step 10: repeating step 8 and step 9 process, until valve color print test result is qualified；
Step 11: dress valve is returned using the valve plate completed is repaired.
2. according to claim 1 be used for nuclear leve gate valve plate sealing surface renovation technique, it is characterised in that: the step
Chuck special used in two includes bearing (6), screw rod (7), handwheel (8), turn plate (9), fixed plate (10) and wedge block
(11)；Turn plate (9) is connect by bearing (6) with fixed plate (10) and realizes rotation, and wherein fixed plate (10) has the section side of being provided with
Shape slot, wedge block (11) are inserted into square groove and realize in slot and horizontally slip；Screw rod (7), handwheel (8) in a manner of the dark bar of valve with
Wedge block (11) is connected through a screw thread, and rotation hand wheel (8) drives screw rod (7) rotation, realizes wedge block (11) in fixed plate (10)
Sliding in square groove.
3. according to claim 1 be used for nuclear leve gate valve plate sealing surface renovation technique, it is characterised in that: the step
Plasma arc welding (PAW) automatic surfacing device used in five includes positioner (12), welding gun (13), storing powder box (14), transverse shifting device
(15), device (16) and controller (17) are vertically moved；Positioner (12) is fixed on lower seat, and inside is equipped with motor, passes through control
Positioner (12) upper disk rotation is realized in instrument (17) operation processed and speed is adjustable；Transverse shifting device (15), longitudinal movement device
(16) it is connected by guide rail, is operated by controller (17) respectively, realize that the automatic transverse and longitudinal of welding gun (13) is mobile.
4. according to claim 1 be used for nuclear leve gate valve plate sealing surface renovation technique, it is characterised in that: the step
Distance measurement instrument (18) You Lianggen guide rail, four lever arms used in one, two pointers composition, between lever arm and lever arm
By rivet interlacement between guide rail, and realize rotation, guide rail two sides are equipped with T-slot, and pointer is packed into T-slot and realizes sliding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711404401.3A CN109955026B (en) | 2017-12-22 | 2017-12-22 | Technology for repairing sealing surface of valve plate of nuclear-grade gate valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711404401.3A CN109955026B (en) | 2017-12-22 | 2017-12-22 | Technology for repairing sealing surface of valve plate of nuclear-grade gate valve |
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| Publication Number | Publication Date |
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| CN109955026A true CN109955026A (en) | 2019-07-02 |
| CN109955026B CN109955026B (en) | 2020-08-21 |
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| CN201711404401.3A Active CN109955026B (en) | 2017-12-22 | 2017-12-22 | Technology for repairing sealing surface of valve plate of nuclear-grade gate valve |
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| CN110744258A (en) * | 2019-11-18 | 2020-02-04 | 中核核电运行管理有限公司 | Online repairing method for valve seat sealing ring of nuclear-grade gate valve |
| CN112439973A (en) * | 2020-11-20 | 2021-03-05 | 江苏核电有限公司 | Repair method for surfacing layer on sealing surface of Russian gate |
| CN114310143A (en) * | 2021-12-14 | 2022-04-12 | 甘肃银光化学工业集团有限公司 | Method for repairing corrosion of sealing surface of compressor under strong acid working condition |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110744258A (en) * | 2019-11-18 | 2020-02-04 | 中核核电运行管理有限公司 | Online repairing method for valve seat sealing ring of nuclear-grade gate valve |
| CN112439973A (en) * | 2020-11-20 | 2021-03-05 | 江苏核电有限公司 | Repair method for surfacing layer on sealing surface of Russian gate |
| CN114310143A (en) * | 2021-12-14 | 2022-04-12 | 甘肃银光化学工业集团有限公司 | Method for repairing corrosion of sealing surface of compressor under strong acid working condition |
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|---|---|
| CN109955026B (en) | 2020-08-21 |
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