CN104690482B - The renovation technique of the high other main valve sealing surface of ultra supercritical coal-fired unit - Google Patents
The renovation technique of the high other main valve sealing surface of ultra supercritical coal-fired unit Download PDFInfo
- Publication number
- CN104690482B CN104690482B CN201510070376.4A CN201510070376A CN104690482B CN 104690482 B CN104690482 B CN 104690482B CN 201510070376 A CN201510070376 A CN 201510070376A CN 104690482 B CN104690482 B CN 104690482B
- Authority
- CN
- China
- Prior art keywords
- valve body
- welding
- valve
- built
- sealing surface
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P6/00—Restoring or reconditioning objects
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P6/00—Restoring or reconditioning objects
- B23P6/04—Repairing fractures or cracked metal parts or products, e.g. castings
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Lift Valve (AREA)
- Butt Welding And Welding Of Specific Article (AREA)
Abstract
The renovation technique of disclosed by the invention ultra supercritical coal-fired unit high side main valve, comprises the following steps：(1) make false valve gap；(2) process the entrance point bevel for welding of valve body；(3) process the port of export bevel for welding of valve body；(4) the initial pile layer at the sealing surface of seat of turning valve body；(5) false valve gap is installed on valve body, then the valve body being provided with false valve gap is carried out the pre-heat treatment before built-up welding；(6) built-up welding transition zone；(7) working lining built-up welding；(8) hardness and coloration detection；(9) water pressure test, completes the reparation of whole main valve sealing surface.The beneficial effects of the present invention is：Through hardness and coloration detection, the defect such as flawless and pore, sealing surface of seat hardness number HRC in valve body is 40～42, after sealing surface of seat is checked through valve element and valve seat, tightness all reaches associated specifications, hydraulic test pressure is 42MPa, more than 1.5 times of pressure, and keep two hours, do not find to leak.
Description
Technical field
The present invention relates to technique for overlaying field, the main valve sealing of more particularly, to a kind of ultra supercritical coal-fired unit high side
The renovation technique in face.
Background technology
The superheater outlet operating pressure of the 1000MW ultra-supercritical coal-fired power generating units used by power plant is 27.56MPa, temperature
Spend for 605 DEG C.The main steam high pressure bypass duct main valve of ultra-supercritical coal-fired power generating units is distributed with four, its entrance point valve body
Material is SA182-F92, and port of export valve body material is SA182-F91.Find that valve seat therein is close during high other main valve Disintegration overhaul
There is penetrating crack in front cover, the weld-deposited cladding that the whole valve body of through crack is located at sealing surface of seat.Crackle leads to valve
Sealing surface tightness is poor, and internal hemorrhage due to trauma is serious, directly affects the economical of generating set and equipment normally runs.Material due to valve body
Using SA182-F92/F91, its cost is higher, such as integral replacing, and cost is larger.Thus need badly a kind of close to the other main valve of height
Front cover carries out the appearance of renovation technique, to reduce the cost of overhaul.
By the domestic height not yet existing to ultra supercritical coal-fired unit, main valve sealing surface carries out renovation technique.
Content of the invention
It is an object of the invention to：A kind of reparation work of the high other main valve sealing surface of ultra supercritical coal-fired unit is provided
Skill.
Technical problem solved by the invention can employ the following technical solutions to realize：
The renovation technique of the high other main valve of ultra supercritical coal-fired unit, comprises the following steps：
(1) valve body is carried out with cleaning decontamination check, survey and draw each spot size of valve body, and make false valve gap；
(2) adopt chuck to clamp the valve gap end of valve body, the cylindrical perpendicular degree of the entrance point of correction valve body, and press
JB/T3595-2002 standard processes the entrance point bevel for welding of valve body；
(3) adopt chuck to clamp the valve gap end of valve body, the cylindrical perpendicular degree of the port of export of correction valve body, and press
JB/T3595-2002 standard processes the port of export bevel for welding of valve body；
(4) the chuck clamping entrance point of valve body or the port of export of valve body are adopted, outside the valve gap end of correction valve body
Circle, endoporus and plane are it is ensured that its perpendicularity and its concentricity, the initial pile layer at the sealing surface of seat of turning valve body then；
(5) false valve gap is installed on valve body, then the valve body being provided with false valve gap is carried out the pre-heat treatment before built-up welding, prolonged with heat
Rate of stretching is less than 150 DEG C of calculating per hour, and the heating-up temperature of the pre-heat treatment is 300 DEG C～350 DEG C, and heat time heating time is 2.5h～8h,
Temperature retention time is 5h～10h；
(6) built-up welding transition zone is carried out using the Ni-based wlding of ENiCrMo-3, transition zone built-up welding thickness is 3mm, built-up welding interlayer temperature
Degree controls at 300 DEG C～350 DEG C；
(7) it is operated built-up welding by the way of SMAW, wlding adopts stellite Stellite6, built-up welding
In 400A～500A, voltage is 30V～40V to process current control, and speed of welding is 200mm/min～300mm/min, working lining
Built-up welding thickness is 5mm；
(8) built-up welding working lining removing surface is clean, then carry out hardness and coloration detection, treat through hardness and coloration detection
After meeting the requirements, it is machined out and grind it is ensured that the perpendicularity in the course of processing and concentricity；
(9) finally valve element and valve seat are carried out sealing surface check, and complete the water pressure test, complete whole main valve sealing
The reparation in face.
In a preferred embodiment of the invention, also included the turning position of valve body is carried out before step (5)
Color detects, if crackle or gas hole defect in the turning position of discovery valve body, is polished using milling tools, until defect is beaten
Mill is clean, turning position is polished into rounding off simultaneously, it is to avoid welding dead angle, reaches build-up welding repair process requirement.
In a preferred embodiment of the invention, also included before step (8) to the valve seat in the valve body after repairing
Sealing surface carries out post weld heat treatment to eliminate internal stress, is less than 150 DEG C of calculating per hour with hot elongation percentage, being heated to temperature is
700 DEG C～800 DEG C, heat time heating time is 6h～10h, and temperature retention time is 5h～10h, then cools to room temperature with the furnace.
Due to employing technical scheme as above, the beneficial effects of the present invention is：Through hardness and coloration detection, no split
The defect such as stricture of vagina and pore, sealing surface of seat hardness number HRC in valve body is 40～42, and sealing surface of seat is checked through valve element and valve seat
Tightness all reaches associated specifications afterwards, and hydraulic test pressure is 42MPa, more than 1.5 times of pressure, and keeps two hours,
Do not find to leak.
Specific embodiment
In order that technological means, creation characteristic, reached purpose and effect that the present invention realizes are easy to understand, below,
The present invention is expanded on further.
Embodiment 1
The renovation technique of the high other main valve of the ultra supercritical coal-fired unit of the present embodiment, comprises the following steps：
(1) before machining, valve body is carried out with cleaning decontamination and checks, survey and draw each spot size of valve body, and make false valve
Lid, wherein, the error control of false valve gap and valve body fit dimension is at (- 0.02-0.05).
(2) adopt chuck to clamp the valve gap end of valve body, the cylindrical perpendicular degree of the entrance point of correction valve body, and press
JB/T3595-2002 standard processes the entrance point bevel for welding of valve body.Before machining work, bracing frame should be carried out and ensure
Firmly installing it is ensured that turning equipment safe handling and safety when processing, additionally, arranging cushion block on the valve gap end of valve body, preventing
Folder damages the valve gap end face of valve body.
(3) adopt chuck to clamp the valve gap end of valve body, the cylindrical perpendicular degree of the port of export of correction valve body, and press
JB/T3595-2002 standard processes the port of export bevel for welding of valve body.The valve gap end of valve body arranges cushion block, prevents folder from damaging valve
The valve gap end face of body.
(4) the chuck clamping entrance point of valve body or the port of export of valve body are adopted, outside the valve gap end of correction valve body
Circle, endoporus and plane it is ensured that its perpendicularity and its concentricity, the initial pile layer at the sealing surface of seat of turning valve body then, plus
Work width and depth dimensions should meet sealing surface of seat remaining thickness and require, but must assure that original overlay cladding turning is clean.This
Outward, cushion block is arranged on the entrance point of valve body or the port of export of valve body, prevent from pressing from both sides and damage the inlet end face of valve body or valve body
Exit end face.
(5) coloration detection is carried out to the turning position of valve body, if the turning position of discovery valve body crackle or pore lacks
Fall into, polished using milling tools, until defect polishing is clean, it is equally confirmed using coloration detection.Simultaneously by car
Cut position and be polished into rounding off, it is to avoid welding dead angle, reach build-up welding repair process requirement.
(6) false valve gap is installed on valve body, then the valve body being provided with false valve gap is put into electric furnace and carry out at heap weld preheating
Reason, with the 100 DEG C of calculating per hour of hot elongation percentage, the heating-up temperature of the pre-heat treatment is 300 DEG C, and heat time heating time is 3h, temperature retention time
For 7h.Valve body, under the supporting role of false valve gap, is effectively prevented the appearance of valve body temperature distortion phenomenon.
(7) because valve body material is SA182-F92/F91, such as direct built-up welding Si Taili cobalt-base alloyss easily produce joint portion
The delamination phenomenon of position.So, transition can be carried out using nickel-bass alloy material through test, built-up welding transition zone also should letter as far as possible
Change.The working condition that transition zone welding material should be selected to the other main valve of height requires, the welding material of Ni-based 625 alloy series
ENiCrMo-3 can keep excellent high-temperature behavior below 700 DEG C, its elevated temperature strength, high-temperature oxidation resistance, high-temperature corrosion-resistance
Performance is substantially better than the welding material ENiCrFe-3 in Ni-based WE182 series.In the present embodiment, Ni-based using ENiCrMo-3
Wlding carries out built-up welding transition zone, and transition zone built-up welding thickness is 3mm, and built-up welding interlayer temperature control is at 300 DEG C.Meanwhile, except valve gap
Place as welding operating position outside, other positions should prevent ventilation and exhaust opening exists, and in transition zone built-up welding gap at any time
Carry out monitoring temperature using infrared thermometer.In addition, in order to avoid causing built-up welding transition zone to ftracture because of alternating hot and cold stress, should
Ensure to be less than 30 DEG C with the temperature difference not welding place at welding.
(8) it is operated built-up welding by the way of SMAW, wlding adopts stellite Stellite6, built-up welding
In 450A, voltage is 35V to process current control, and speed of welding is 250mm/min, and working lining built-up welding thickness is 5mm.Si Taili closes
Golden Stellite6 has certain " red hardness " under 800 DEG C of high temperature, can guarantee that the other main valve sealing surface of height at 605 DEG C
There is under the conditions of steam flush good wearability, abrasion resistance, corrosion resistance.Further, since the complex structure of valve body, just
Property big, stress distribution situation different, weld deposit process can produce very big circumferential stress and alternating hot and cold stress, thus need
Note：A, attention striking and receipts arc, prevent pore and crater crack；B, control molten bath are in the same size, uniformly it is ensured that processing
Size；C, welding direction must be consistent, welding along clockwise direction；D, backstep sequence, subregion welding.
(9) post weld heat treatment is carried out to eliminate internal stress to the sealing surface of seat in the valve body after repairing, with hot elongation percentage
100 DEG C of calculating per hour, is heated to temperature and is 750 DEG C, and heat time heating time is 7.5h, and temperature retention time is 7h, then cools to the furnace
Room temperature.It mainly adopts overall electrical heating, and the temperature of high tempering, wherein high tempering, constant temperature time, warming and cooling rate etc. are joined
Number must take into account valve body and built-up welding working lining.
(10) built-up welding working lining removing surface is clean, then carry out hardness and coloration detection, treat through hardness and coloring inspection
After survey meets the requirements, it is machined out and grind it is ensured that the perpendicularity in the course of processing and concentricity；
(11) finally valve element and valve seat are carried out sealing surface check, and complete the water pressure test, complete whole main valve close
The reparation of front cover.
According to above step, the sealing surface of seat in valve body through hardness and coloration detection, the defect such as flawless and pore,
Sealing surface of seat hardness number HRC in valve body is 42, and after sealing surface of seat is checked through valve element and valve seat, tightness all reaches correlation
Technical requirements, hydraulic test pressure is 42MPa, more than 1.5 times of pressure, and keeps two hours, does not find to leak.
Embodiment 2
The renovation technique of the high other main valve of the ultra supercritical coal-fired unit of the present embodiment, comprises the following steps：
(1) before machining, valve body is carried out with cleaning decontamination and checks, survey and draw each spot size of valve body, and make false valve
Lid.
(2) adopt chuck to clamp the valve gap end of valve body, the cylindrical perpendicular degree of the entrance point of correction valve body, and press
JB/T3595-2002 standard processes the entrance point bevel for welding of valve body.
(3) adopt chuck to clamp the valve gap end of valve body, the cylindrical perpendicular degree of the port of export of correction valve body, and press
JB/T3595-2002 standard processes the port of export bevel for welding of valve body.
(4) the chuck clamping entrance point of valve body or the port of export of valve body are adopted, outside the valve gap end of correction valve body
Circle, endoporus and plane it is ensured that its perpendicularity and its concentricity, the initial pile layer at the sealing surface of seat of turning valve body then, plus
Work width and depth dimensions should meet sealing surface of seat remaining thickness and require, but must assure that original overlay cladding turning is clean.
(5) coloration detection is carried out to the turning position of valve body, if the turning position of discovery valve body crackle or pore lacks
Fall into, polished using milling tools, until defect polishing is clean, it is equally confirmed using coloration detection.Simultaneously by car
Cut position and be polished into rounding off, it is to avoid welding dead angle, reach build-up welding repair process requirement.
(6) false valve gap is installed on valve body, then the valve body being provided with false valve gap is put into electric furnace and carry out at heap weld preheating
Reason, with the 100 DEG C of calculating per hour of hot elongation percentage, the heating-up temperature of the pre-heat treatment is 350 DEG C, and heat time heating time is 3.5h, during insulation
Between be 5h.
(7) built-up welding transition zone is carried out using the Ni-based wlding of ENiCrMo-3, transition zone built-up welding thickness is 3mm, built-up welding interlayer temperature
Degree controls at 300 DEG C.
(8) it is operated built-up welding by the way of SMAW, wlding adopts stellite Stellite6, built-up welding
In 400A, voltage is 30V to process current control, and speed of welding is 200mm/min, and working lining built-up welding thickness is 5mm.
(9) post weld heat treatment is carried out to eliminate internal stress to the sealing surface of seat in the valve body after repairing, with hot elongation percentage
100 DEG C of calculating per hour, is heated to temperature and is 800 DEG C, and heat time heating time is 8h, and temperature retention time is 5h, then cools to room with the furnace
Temperature.
(10) built-up welding working lining removing surface is clean, then carry out hardness and coloration detection；
(11) finally valve element and valve seat are carried out sealing surface check, and complete the water pressure test, complete whole main valve close
The reparation of front cover.
According to above step, the sealing surface of seat in valve body through hardness and coloration detection, the defect such as flawless and pore,
Sealing surface of seat hardness number HRC in valve body is 40, and after sealing surface of seat is checked through valve element and valve seat, tightness all reaches correlation
Technical requirements, hydraulic test pressure is 42MPa, more than 1 times of pressure, and keeps two hours, does not find to leak.
Embodiment 3
The renovation technique of the high other main valve of the ultra supercritical coal-fired unit of the present embodiment, comprises the following steps：
(1) before machining, valve body is carried out with cleaning decontamination and checks, survey and draw each spot size of valve body, and make false valve
Lid.
(2) adopt chuck to clamp the valve gap end of valve body, the cylindrical perpendicular degree of the entrance point of correction valve body, and press
JB/T3595-2002 standard processes the entrance point bevel for welding of valve body.
(3) adopt chuck to clamp the valve gap end of valve body, the cylindrical perpendicular degree of the port of export of correction valve body, and press
JB/T3595-2002 standard processes the port of export bevel for welding of valve body.
(4) the chuck clamping entrance point of valve body or the port of export of valve body are adopted, outside the valve gap end of correction valve body
Circle, endoporus and plane it is ensured that its perpendicularity and its concentricity, the initial pile layer at the sealing surface of seat of turning valve body then, plus
Work width and depth dimensions should meet sealing surface of seat remaining thickness and require, but must assure that original overlay cladding turning is clean.
(5) coloration detection is carried out to the turning position of valve body, if the turning position of discovery valve body crackle or pore lacks
Fall into, polished using milling tools, until defect polishing is clean, it is equally confirmed using coloration detection.Simultaneously by car
Cut position and be polished into rounding off, it is to avoid welding dead angle, reach build-up welding repair process requirement.
(6) false valve gap is installed on valve body, then the valve body being provided with false valve gap is put into electric furnace and carry out at heap weld preheating
Reason, with the 50 DEG C of calculating per hour of hot elongation percentage, the heating-up temperature of the pre-heat treatment is 350 DEG C, and heat time heating time is 7h, temperature retention time
For 10h.
(7) built-up welding transition zone is carried out using the Ni-based wlding of ENiCrMo-3, transition zone built-up welding thickness is 3mm, built-up welding interlayer temperature
Degree controls at 350 DEG C.
(8) it is operated built-up welding by the way of SMAW, wlding adopts stellite Stellite6, built-up welding
In 500A, voltage is 40V to process current control, and speed of welding is 300mm/min, and working lining built-up welding thickness is 5mm.
(9) post weld heat treatment is carried out to eliminate internal stress to the sealing surface of seat in the valve body after repairing, with hot elongation percentage
100 DEG C of calculating per hour, is heated to temperature and is 800 DEG C, and heat time heating time is 8h, and temperature retention time is 10h, then cools to room with the furnace
Temperature.
(10) built-up welding working lining removing surface is clean, then carry out hardness and coloration detection；
(11) finally valve element and valve seat are carried out sealing surface check, and complete the water pressure test, complete whole main valve close
The reparation of front cover.
According to above step, the sealing surface of seat in valve body through hardness and coloration detection, the defect such as flawless and pore,
Sealing surface of seat hardness number HRC in valve body is 40, and after sealing surface of seat is checked through valve element and valve seat, tightness all reaches correlation
Technical requirements, hydraulic test pressure is 42MPa, more than 1.2 times of pressure, and keeps two hours, does not find to leak.
Ultimate principle and principal character and the advantages of the present invention of the present invention have been shown and described above.The technology of the industry
, it should be appreciated that the present invention is not restricted to the described embodiments, the simply explanation described in above-described embodiment and description is originally for personnel
The principle of invention, without departing from the spirit and scope of the present invention, the present invention also has various changes and modifications, these changes
Change and improvement both falls within scope of the claimed invention.Claimed scope by appending claims and its
Equivalent thereof.
Claims (3)
1. the renovation technique of the high other main valve of ultra supercritical coal-fired unit is it is characterised in that comprise the following steps：
(1) valve body is carried out with cleaning decontamination check, survey and draw each spot size of valve body, and make false valve gap；
(2) adopt chuck to clamp the valve gap end of valve body, the cylindrical perpendicular degree of the entrance point of correction valve body, and press JB/
T3595-2002 standard processes the entrance point bevel for welding of valve body；
(3) adopt chuck to clamp the valve gap end of valve body, the cylindrical perpendicular degree of the port of export of correction valve body, and press JB/
T3595-2002 standard processes the port of export bevel for welding of valve body；
(4) adopt the chuck clamping entrance point of the valve body or port of export of valve body, the valve gap end of correction valve body cylindrical, interior
Hole and plane are it is ensured that its perpendicularity and its concentricity, the initial pile layer at the sealing surface of seat of turning valve body then；
(5) false valve gap is installed on valve body, then the valve body being provided with false valve gap is carried out the pre-heat treatment before built-up welding, with hot elongation percentage
Less than 150 DEG C per hour calculating, the heating-up temperature of the pre-heat treatment is 300 DEG C～350 DEG C, and heat time heating time is 2.5h～8h, insulation
Time is 5h～10h；
(6) built-up welding transition zone is carried out using the Ni-based wlding of ENiCrMo-3, transition zone built-up welding thickness is 3mm, built-up welding interlayer temperature control
System is at 300 DEG C～350 DEG C；
(7) it is operated built-up welding by the way of SMAW, wlding adopts stellite Stellite6, weld deposit process
In 400A～500A, voltage is 30V～40V to current control, and speed of welding is 200mm/min～300mm/min, working lining built-up welding
Thickness is 5mm；
(8) built-up welding working lining removing surface is clean, then carry out hardness and coloration detection, treat to meet through hardness and coloration detection
After requirement, it is machined out and grind it is ensured that the perpendicularity in the course of processing and concentricity；
(9) finally valve element and valve seat are carried out sealing surface check, and complete the water pressure test, complete whole main valve sealing surface
Repair.
2. by ultra supercritical coal-fired unit height as claimed in claim 1 main valve renovation technique it is characterised in that
Also include carrying out coloration detection to the turning position of valve body before step (5), if find valve body turning position occur crackle or
Gas hole defect, is polished using milling tools, until defect polishing is clean, turning position is polished into rounding off simultaneously,
Avoid welding dead angle, reach build-up welding repair process requirement.
3. by ultra supercritical coal-fired unit height as claimed in claim 1 main valve renovation technique it is characterised in that
Also include before step (8) carrying out post weld heat treatment to eliminate internal stress to the sealing surface of seat in the valve body after repairing, with heat
Elongation percentage is less than 150 DEG C of calculating per hour, is heated to temperature and is 700 DEG C～800 DEG C, and heat time heating time is 6h～10h, temperature retention time
For 5h～10h, then cool to room temperature with the furnace.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510070376.4A CN104690482B (en) | 2015-02-10 | 2015-02-10 | The renovation technique of the high other main valve sealing surface of ultra supercritical coal-fired unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510070376.4A CN104690482B (en) | 2015-02-10 | 2015-02-10 | The renovation technique of the high other main valve sealing surface of ultra supercritical coal-fired unit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104690482A CN104690482A (en) | 2015-06-10 |
| CN104690482B true CN104690482B (en) | 2017-03-01 |
Family
ID=53338235
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510070376.4A Active CN104690482B (en) | 2015-02-10 | 2015-02-10 | The renovation technique of the high other main valve sealing surface of ultra supercritical coal-fired unit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104690482B (en) |
Families Citing this family (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104942525B (en) * | 2015-07-17 | 2017-04-12 | 武汉开明高新科技有限公司 | Ultra-large copper nut remanufacturing technology |
| CN105750693B (en) * | 2016-04-29 | 2018-02-16 | 山西阳煤化工机械（集团）有限公司 | A kind of high-abrasive material overlaying method for reducing preheating temperature |
| CN106964872B (en) * | 2017-03-24 | 2019-06-07 | 江苏力沛电力工程技术服务有限公司 | A kind of manual electric arc welding SMAW deep hole overlaying method |
| CN109695774B (en) * | 2017-10-20 | 2020-08-21 | 中核苏阀科技实业股份有限公司 | Maintenance method for inner leakage closed loop of hard seal ball valve |
| CN108971883B (en) * | 2018-09-30 | 2019-11-15 | 上海吴泾电力工程有限责任公司 | Suitable for cheating the field repairing method of cavity space |
| CN109719455A (en) * | 2018-11-12 | 2019-05-07 | 苏州苏恩奈工程技术有限公司 | A kind of method for maintaining of the interior low voltage bypass valve leaked of valve body |
| CN110744259A (en) * | 2019-11-26 | 2020-02-04 | 西安热工研究院有限公司 | Gradient repairing method for sealing surface of high-pressure main steam valve for thermal power generating unit |
| CN111069754A (en) * | 2019-12-05 | 2020-04-28 | 南京中远海运船舶设备配件有限公司 | Surfacing method for reducing residual stress of welding of gas valve based on numerical simulation |
| CN111230748B (en) * | 2019-12-30 | 2023-08-08 | 浙江浙能中煤舟山煤电有限责任公司 | Method for solving problem of jamming of high-medium pressure regulating air valve of steam turbine |
| CN112894260B (en) * | 2021-01-22 | 2022-09-09 | 西部超导材料科技股份有限公司 | Hydraulic valve block crack repairing method |
| CN112935480B (en) * | 2021-03-25 | 2022-06-03 | 安徽马钢设备检修有限公司 | Repairing process for surface abrasion of large wheel fixing table base |
| CN113231788A (en) * | 2021-06-03 | 2021-08-10 | 上海电力股份有限公司吴泾热电厂 | On-site repairing method for sealing surface of valve seat of in-service safety valve |
| 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 |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2823457A1 (en) * | 2001-04-13 | 2002-10-18 | Pecquet Tesson Et Cie | Method for repairing large valve seating, comprises dismantling valve and mechanism to allow access on site to seating, removal of worn seating material and replacement by numerically controlled welder |
| RU2010127047A (en) * | 2010-07-01 | 2012-01-10 | Государственное образовательное учреждение высшего профессионального образования "Ярославский государственный технический универси | METHOD FOR MANUFACTURING OR RESTORING SADDLE VALVES OF CAST IRON HEADS OF INTERNAL COMBUSTION ENGINE CYLINDERS BY SURFACE METHOD |
| CN103521939A (en) * | 2013-10-31 | 2014-01-22 | 南通市电站阀门有限公司 | Valve sealing face repairing process method |
| CN103639643A (en) * | 2013-11-27 | 2014-03-19 | 江苏力沛电力工程技术服务有限公司 | Repair technology for valve sealing surface |
-
2015
- 2015-02-10 CN CN201510070376.4A patent/CN104690482B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2823457A1 (en) * | 2001-04-13 | 2002-10-18 | Pecquet Tesson Et Cie | Method for repairing large valve seating, comprises dismantling valve and mechanism to allow access on site to seating, removal of worn seating material and replacement by numerically controlled welder |
| RU2010127047A (en) * | 2010-07-01 | 2012-01-10 | Государственное образовательное учреждение высшего профессионального образования "Ярославский государственный технический универси | METHOD FOR MANUFACTURING OR RESTORING SADDLE VALVES OF CAST IRON HEADS OF INTERNAL COMBUSTION ENGINE CYLINDERS BY SURFACE METHOD |
| CN103521939A (en) * | 2013-10-31 | 2014-01-22 | 南通市电站阀门有限公司 | Valve sealing face repairing process method |
| CN103639643A (en) * | 2013-11-27 | 2014-03-19 | 江苏力沛电力工程技术服务有限公司 | Repair technology for valve sealing surface |
Non-Patent Citations (2)
| Title |
|---|
| 电站高温高压阀门密封面的修复;田平;《冶金动力》;20121231(第6期);第50-52页 * |
| 进口350 MW 汽轮机中压调阀密封面微弧焊修复;赵健等;《山西电力》;20091231(第6期);第56-58页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104690482A (en) | 2015-06-10 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104690482B (en) | The renovation technique of the high other main valve sealing surface of ultra supercritical coal-fired unit | |
| CN104084675B (en) | A kind of high-temperature nickel-base alloy welding procedure | |
| CN102756235B (en) | Field welding repair method especially for larger and penetrating defects in steel casting with heavy wall thickness | |
| CN109014518B (en) | Welding device and repairing process for train wheel die holder | |
| CN103639643B (en) | Valve sealing face maintenance craft | |
| CN102717171B (en) | Plug welding repair technology for mammoth converter shell perforation | |
| CN102756218B (en) | Benzene hydrogenation engineering heat resisting steel method for welding pipeline | |
| CN101152689A (en) | Renovation technology for ladle | |
| CN112935479A (en) | Welding device and repairing process for large wheel fixing table base fracture | |
| CN104551337A (en) | 30CrMo heat resistant steel pipeline welding construction method | |
| CN104923928B (en) | A kind of Q690D steel pipe vertical seam welding methods for crane arm support | |
| CN105750705A (en) | Heat-resisting steel pipe welding technology | |
| CN109317789B (en) | Welding method for surfacing pipe plate of heat exchanger and T91 heat exchange pipe | |
| CN102267000B (en) | Metal active gas (MAG) welding method for butting quenched low-alloy super-high-strength steel and high-quality carbon structural steel | |
| CN104526133A (en) | Method for preventing tearing of metal welding layers | |
| CN113231788A (en) | On-site repairing method for sealing surface of valve seat of in-service safety valve | |
| CN102284772B (en) | Argon arc back sealing welding method for housing of low-pressure water supply heater of third-generation nuclear power steam turbine | |
| CN104191066A (en) | Cast steel repair welding process | |
| CN102350574A (en) | Argon arc welding double-gun butt-welding method | |
| CN215238459U (en) | Cracked welding device for base of large wheel fixing table | |
| CN104607863A (en) | Iron casting mold repair welding method | |
| CN101934434A (en) | Cast iron hot repair welding process and device | |
| CN111496357A (en) | Transverse welding method for BB41-BF hot blast furnace shell | |
| CN111805053B (en) | Manufacturing method of efficient ultra-supercritical boiler T23 material membrane wall | |
| CN106239030A (en) | A kind of thermal power plant drum down-comer bead crack method for repairing and mending |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20170302 Address after: 201413 Shanghai city Fengxian District new Siping Road No. 1333 Patentee after: Shanghai Pingan High-pressure Adjust Valve Co., Ltd. Patentee after: Shanghai Ya An Power Station Auxiliary Equipment Co., Ltd. Address before: 201413 Shanghai city Fengxian District new Siping Road No. 1333 Patentee before: Shanghai Pingan High-pressure Adjust Valve Co., Ltd. |