CN110000618B - Valve core-provided C-shaped ring auxiliary sealing adjusting valve repairing tool and repairing method - Google Patents
Valve core-provided C-shaped ring auxiliary sealing adjusting valve repairing tool and repairing method Download PDFInfo
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- CN110000618B CN110000618B CN201711472262.8A CN201711472262A CN110000618B CN 110000618 B CN110000618 B CN 110000618B CN 201711472262 A CN201711472262 A CN 201711472262A CN 110000618 B CN110000618 B CN 110000618B
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- 238000007789 sealing Methods 0.000 title claims abstract description 189
- 238000000034 method Methods 0.000 title claims abstract description 38
- 238000000227 grinding Methods 0.000 claims abstract description 129
- 238000012360 testing method Methods 0.000 claims abstract description 28
- 238000007689 inspection Methods 0.000 claims abstract description 18
- 230000001105 regulatory effect Effects 0.000 claims abstract description 17
- 230000007547 defect Effects 0.000 claims description 33
- 244000137852 Petrea volubilis Species 0.000 claims description 20
- 238000003825 pressing Methods 0.000 claims description 12
- 230000007704 transition Effects 0.000 claims description 7
- 238000005299 abrasion Methods 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 6
- 238000005498 polishing Methods 0.000 claims description 6
- 229910001220 stainless steel Inorganic materials 0.000 claims description 6
- 239000010935 stainless steel Substances 0.000 claims description 6
- 239000011248 coating agent Substances 0.000 claims description 5
- 238000000576 coating method Methods 0.000 claims description 5
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- 238000004519 manufacturing process Methods 0.000 claims description 4
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- 238000010791 quenching Methods 0.000 claims description 4
- 230000000171 quenching effect Effects 0.000 claims description 4
- 238000004381 surface treatment Methods 0.000 claims description 4
- 238000003754 machining Methods 0.000 claims description 3
- 238000003466 welding Methods 0.000 claims 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 3
- 238000010276 construction Methods 0.000 abstract description 2
- 238000013461 design Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- DCYOBGZUOMKFPA-UHFFFAOYSA-N iron(2+);iron(3+);octadecacyanide Chemical compound [Fe+2].[Fe+2].[Fe+2].[Fe+3].[Fe+3].[Fe+3].[Fe+3].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-].N#[C-] DCYOBGZUOMKFPA-UHFFFAOYSA-N 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 229960003351 prussian blue Drugs 0.000 description 2
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- 229910052755 nonmetal Inorganic materials 0.000 description 1
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- 229920001343 polytetrafluoroethylene Polymers 0.000 description 1
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B1/00—Processes of grinding or polishing; Use of auxiliary equipment in connection with such processes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B49/00—Measuring or gauging equipment for controlling the feed movement of the grinding tool or work; Arrangements of indicating or measuring equipment, e.g. for indicating the start of the grinding operation
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
- B24B53/00—Devices or means for dressing or conditioning abrasive surfaces
- B24B53/12—Dressing tools; Holders therefor
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Details Of Valves (AREA)
- Grinding And Polishing Of Tertiary Curved Surfaces And Surfaces With Complex Shapes (AREA)
Abstract
The invention belongs to the technical field of pneumatic valve repair, and particularly relates to a valve providing a regulating valve sealing surface state checking and repairing tool with a C-shaped sealing ring for a valve core and a valve seat sealing surface, which cover the common problem of repairing the valve core with the C-shaped sealing ring, and a repairing process; the method comprises the following steps: step one, checking and repairing the valve core and the valve seat; repairing the sealing surface of the valve seat; step three, blue oil test; repairing the sealing surface of the valve core; step five: checking the sealing surface of the valve core and the valve seat after grinding; step six: and (5) testing the leakage rate on line after the valve is reinstalled. The invention can effectively realize the inspection and repair of the sealing surface of the regulating valve with the C-shaped sealing ring structure of the valve core during the construction, the adjustment and the operation of the pressurized water reactor nuclear power unit; the sealing surface repairing process is flexible, efficient, convenient and easy to control accurately, and the repairing process and the principle thereof can be popularized to the situation of repairing sealing surfaces of other valve cores with C-shaped sealing ring regulating valves.
Description
Technical Field
The invention belongs to the technical field of pneumatic valve repair, and particularly relates to a repair tool and a repair method for an adjusting valve with a valve core provided with a C-shaped ring for auxiliary sealing.
Background
The pneumatic control valve has many applications in pressurized water reactor nuclear power plants, especially in key systems such as waste heat export systems. One type of pneumatic control valve is a valve with a C-ring seal, typically designed in a balanced manner, as shown in fig. 1. When the pneumatic valve is closed, the C-shaped sealing ring and the valve cage form interference fit, and the C-shaped sealing ring is extruded by the inner wall of the valve cage to generate certain deformation. The open position of the C-shaped sealing ring is generally opposite to the inlet high-pressure side of the pneumatic valve, and high-pressure fluid flows into the annular groove of the C-shaped sealing ring through the opening in normal operation and forces the C-shaped sealing ring to deform, so that a firm seal is formed between the C-shaped sealing ring and the valve cage. The sealing can effectively share the sealing burden on the valve seat and the valve core, reduce the sealing specific pressure between the valve seat and the valve core, further reduce the output load of the actuating mechanism and effectively reduce the design size of the actuating mechanism. Therefore, pneumatic valves with C-ring seals are commonly used in high temperature, high pressure systems, especially in nuclear power plant-loop systems, and play a critical role therein.
When problems occur in the valve core and valve seat sealing surfaces of the pneumatic valve, the valve core and valve seat sealing surfaces are generally checked and verified through a blue oil test. However, it is difficult to confirm the integrity of the sealing surfaces of the valve core and the valve seat of the pneumatic valve with the C-shaped sealing ring by a blue oil test. The main reason is that when the valve is operated, the valve core is guided by the cage with accurate size, and is pressed onto the valve seat by the output force of the actuating mechanism, and meanwhile, the C-shaped sealing ring and the valve seat form interference fit. In the overhauling process, the valve core and the valve seat are taken out from the valve body, and when a blue oil test is performed, the contact condition of the sealing surface of the valve body is checked through the reinstalling valve body and the executing mechanism, so that a large amount of manpower and material resources are consumed, and meanwhile, the risk that personnel and objects are polluted by radioactive media is also improved; if the valve core is forcedly pressed onto the sealing surface of the valve seat under the guidance of the valve cage by using a pressure equal pressure device, the valve rod has the risk of being bent due to the lack of the connection guidance of the valve actuating mechanism rod and the valve rod, and the C-shaped sealing ring and the inner surface of the valve cage contacted with the C-shaped sealing ring can also have the risk of being crushed, scraped or deformed due to the poor concentricity of the valve core and the valve cage in the pressing process. In addition, when grinding a damaged sealing surface, it is difficult to select a grinder with an angle matching because the angles of the valve seat and the valve element are less common. Another concern is that after finding a proper grinder, coaxiality between the grinding head part of the grinder and the valve core and the valve seat cannot be achieved by virtue of a guide rod or a guide sleeve of the grinder, and because of the particularity of the pneumatic adjusting valve with the C-shaped sealing ring, the sealing surface of the pneumatic adjusting valve needs to be precisely controlled during grinding, otherwise, the sealing line deviation can be caused, and a conclusion can be drawn based on the reason that the grinding machine cannot complete the sealing surface repairing work of the pneumatic adjusting valve with the C-shaped sealing ring by virtue of the general stop valve. Considering the key position of the pneumatic valve with the C-shaped sealing ring, a proper repairing method or a proper combination of methods is required to be selected according to the actual condition of the site, and on the premise of ensuring the repairing quality and safety of the valve core and the valve seat, the repairing of the defects of the valve core and the valve seat with the C-shaped sealing ring is very important to reducing the radiation dose of personnel and improving the overhaul efficiency of equipment.
Disclosure of Invention
The invention aims to provide a check repair tool and a repair method for the state of a sealing surface of a regulating valve, wherein the valve core is provided with a C-shaped sealing ring, and the check repair tool is used for covering the common problem of repairing the sealing surface of the valve core and the valve seat with the C-shaped sealing ring.
The technical scheme of the invention is as follows:
the utility model provides a valve core has C type ring auxiliary seal's governing valve repair tool, includes uide bushing (1) and disk seat grinding mould (4); two uniformly distributed through holes are axially formed in the valve core guide sleeve (1), and two lengthened bolts penetrate through the through holes to fix the valve seat (6) and the valve core (5); the valve seat grinding mould (4) is made of stainless steel, the surface is subjected to surface treatment such as quenching, and the inner diameter of the mould is strictly referenced with the outer diameter of the valve seat to realize accurate centering.
The inner diameter and the outer diameter of the guide sleeve (1) are strictly designed according to the assembly positions of the valve core (5) and the valve seat (6).
The valve seat grinding mould (4) is provided with a transition section at the lower end of the guide section.
The implementation of the regulating valve repairing method with the C-shaped ring auxiliary seal on the valve core is based on the regulating valve repairing tool with the C-shaped ring auxiliary seal on the valve core comprises the following steps:
step one, valve core and valve seat inspection and repair preparation
(1.1) inspection of sealing surfaces: the internal leakage phenomenon of the valve is known by combining system debugging and state feedback of the valve in production operation, and after each part of the valve is removed, the sealing surfaces of the valve core and the valve seat are checked by using a flashlight or a special checking tool; the specific mark is carried out on the defect on the locking sealing surface after the specific position of the defect is locked, so that the defect can be conveniently and subsequently ground and can be referred to in the process of rechecking;
(1.2) damaged sealing surface assessment: carefully measuring and evaluating the damaged position of the sealing surface, and selecting a proper repairing mode and a grinding flow of the sealing surface according to an evaluation result;
(1.3) sealing surface restoration mode: according to the damage degree, if the damage is serious, if the defects such as deeper pits, scratches and the like appear, firstly, a proper amount of turning is determined by referring to factors such as materials, a build-up layer and the like, the damaged part of the sealing surface is reduced to the degree that the sealing surface can be repaired in a grinding mode, and then a repairing tool is used for repairing; in addition, if the sealing surface is severely damaged but not sufficiently repaired for the first time by machining, a repair tool should be used for repair.
(1.4) seal face grinding procedure: if the damage of the sealing surface is heavier, firstly, grinding the sealing surface roughly by using high-granularity grinding sand paper, and after grinding to a slight extent, grinding the damaged part finely by using low-granularity grinding sand paper; finally polishing with the most fine sand paper. If the damage of the sealing surface is slight, directly lapping by using grinding sand paper with low granularity and finally polishing as required;
(1.5) taking necessary measures such as personnel industrial safety protection, personnel radiation protection, equipment damage protection, system foreign matter prevention and the like aiming at the specific field environment of the regulating valve;
step two, repairing sealing surface of valve seat
After the damage degree of the sealing surface of the valve seat is evaluated, a reasonable repairing mode is adopted; uniformly sticking abrasive paper in an abrasive area of the repairing tool; after the pasting is finished, assembling the repair tool on the valve seat and uniformly rotating the repair tool; checking the repair condition of the sealing surface and the abrasion degree of the abrasive paper after grinding for a certain time, and replacing the abrasive paper before the effective grinding layer is consumed; gradually eliminating damage on the valve seat according to a correct grinding flow;
step three, blue oil test
Mounting the repairing tool on the valve seat and fastening the repairing tool by using two special bolts; uniformly coating a thin layer of blue oil on the valve core; the valve core is assembled on the valve seat through the valve core guide sleeve, and a certain pressing force is manually applied; slightly lifting the valve core from the valve seat, wherein the valve core is not required to deflect in the lifting process; after the repairing tool is removed, checking whether a sealing line formed by the contact of the valve core on the sealing surface of the valve seat and the valve seat is complete and clear;
fourth, valve element sealing surface repair
Carefully evaluating the damage part of the valve core sealing surface and adopting a reasonable repairing mode; uniformly sticking abrasive paper on the grinding areas of the repairing tool; after the sticking is finished, assembling the repair tool on the valve core and uniformly rotating the repair tool; checking the abrasion degree of the abrasive paper after grinding for a certain time, wherein the effective grinding layer needs to be replaced by a new grinding abrasive paper just before being consumed; after grinding for a certain time, observing the repair degree of the damaged part of the valve core sealing surface until the damage on the valve core sealing surface is thoroughly eliminated;
step five: inspection of valve core and valve seat sealing surface after grinding
After the valve seat and the valve core are repaired, a blue oil test is performed again; mounting the repairing tool on the valve seat again, and fastening by using two special bolts; and after the valve core coated with the blue oil is mounted on the valve seat through the guide sleeve, lifting the valve seat, removing the valve core guide sleeve, and checking whether a sealing line formed by the contact of the valve core on the sealing surface of the valve seat and the valve seat is complete and clear. According to the result of the blue oil test, if necessary, repeating the second step or the fifth step, and carrying out final grinding and finishing on the valve seat and the valve core until the final blue oil is detected to be qualified;
step six: online leakage rate test after valve reinstallation
And (3) the valve core and the valve seat which are ground and are subjected to seal surface inspection pass are installed on the valve body, the sealing performance of the valve core and the valve seat is inspected by pressing a system pipeline through an online test, if the valve core and the valve seat are qualified, the grinding effect is good, if the valve core and the valve seat are not qualified, the valve core and the valve seat are required to be disassembled again, and the seal surface is ground and inspected again according to the steps one to five until the valve core and the valve seat are qualified.
The invention has the beneficial effects that:
the invention can effectively realize the inspection and repair of the sealing surface of the regulating valve with the C-shaped sealing ring structure of the valve core during the construction, the debugging and the operation of the pressurized water reactor nuclear power unit. By combining the traditional valve sealing surface checking and repairing method, the invention adopts a plurality of designed special tools, namely a valve core guide sleeve, a valve seat grinding tool and a valve core grinding tool, and a corresponding method, can effectively check the valve core and the valve seat sealing surface of the regulating valve with the C-shaped sealing ring, effectively eliminate the defects on the valve core and the valve seat sealing surface, and ensure that the regulating valve has good sealing performance. Practice shows that after the inspection and the method of the valve seat and the valve seat sealing surface are adopted, the defects on the valve seat and the valve seat sealing surface can be found in time; after the corresponding repairing method is adopted, the defects on the valve core and the valve seat can be effectively eliminated. The guide sleeve, the valve core and the valve seat grinding clamping fixture designed in the invention have simple and reliable structure, and the sealing surface repairing method is flexible, efficient, convenient and easy to control accurately. The specific technical effects are as follows:
1) The valve core guide sleeve is made of common materials, is simple to manufacture, is accurate in size control, and is firm in assembly and fixing mode with the valve seat. The valve core can be ensured not to damage the C-shaped sealing ring during passing until contacting with the valve seat, and the concentricity of the valve core and the valve seat can be accurately ensured.
2) The grinding mould for the valve seat is simple in structure, coaxiality is well guaranteed when the grinding mould is assembled with the valve seat, the designed grinding area effectively envelopes the sealing surface of the valve seat, no deflection between the valve seat and the mould can be guaranteed when grinding is carried out, and interference between the valve seat and the mould during grinding is avoided. In the grinding process of the valve seat, the mould acts stably and has no deflection, and the defects can be removed uniformly and effectively.
3) The valve core grinding mould has light structure and simple use. The assembly with the valve core is accurate in size control, and coaxiality between the valve core and the valve core is well guaranteed. As with the valve seat grinding mold, the grinding area of the valve element grinding mold can effectively envelope the sealing surface of the valve element. The repairing of the defect can be effectively completed in the grinding process.
Drawings
FIG. 1 is a schematic diagram of a valve core structure;
FIG. 2 is a schematic diagram of the assembly of the valve seat and the valve core when blue oil is used;
FIG. 3 is a schematic view of the valve seat and grinding mold assembly during grinding of the valve seat;
fig. 4 is a schematic view of the valve core and the grinding mold assembly when grinding the valve core.
In the figure: 1. a guide sleeve; 2. a guide sleeve fixing bolt; 3. valve core grinding mould; 4. valve seat grinding mould; 5. a valve core; 6. a valve seat; 7. a C-shaped sealing ring; 8. c-shaped ring fastening pressing sleeve; 9. a valve core lifting device; 10. grinding sand paper; 11. and a valve core placement device.
Detailed Description
The invention is further described with reference to the following drawings and examples:
the utility model provides a valve core has C type ring auxiliary seal's governing valve repair tool, includes uide bushing (1) and disk seat grinding mould (4); two uniformly distributed through holes are axially formed in the valve core guide sleeve (1), and two lengthened bolts penetrate through the through holes to fix the valve seat (6) and the valve core (5); the valve seat grinding mould (4) is made of stainless steel, the surface is subjected to surface treatment such as quenching, and the inner diameter of the mould is strictly referenced with the outer diameter of the valve seat to realize accurate centering.
The inner diameter and the outer diameter of the guide sleeve (1) are strictly designed according to the assembly positions of the valve core (5) and the valve seat (6).
The valve seat grinding mould (4) is provided with a transition section at the lower end of the guide section.
The implementation of the regulating valve repairing method with the C-shaped ring auxiliary seal on the valve core is based on the regulating valve repairing tool with the C-shaped ring auxiliary seal on the valve core comprises the following steps:
step one, valve core and valve seat inspection and repair preparation
(1.1) inspection of sealing surfaces: the internal leakage phenomenon of the valve is known by combining system debugging and state feedback of the valve in production operation, and after each part of the valve is removed, the sealing surfaces of the valve core and the valve seat are checked by using a flashlight or a special checking tool; the specific mark is carried out on the defect on the locking sealing surface after the specific position of the defect is locked, so that the defect can be conveniently and subsequently ground and can be referred to in the process of rechecking;
(1.2) damaged sealing surface assessment: carefully measuring and evaluating the damaged position of the sealing surface, and selecting a proper repairing mode and a grinding flow of the sealing surface according to an evaluation result;
(1.3) sealing surface restoration mode: according to the damage degree, if the damage is serious, if the defects such as deeper pits, scratches and the like appear, firstly, a proper amount of turning is determined by referring to factors such as materials, a build-up layer and the like, the damaged part of the sealing surface is reduced to the degree that the sealing surface can be repaired in a grinding mode, and then a repairing tool is used for repairing; in addition, if the sealing surface is severely damaged but not sufficiently repaired for the first time by machining, a repair tool should be used for repair.
(1.4) seal face grinding procedure: if the damage of the sealing surface is heavier, firstly, grinding the sealing surface roughly by using high-granularity grinding sand paper, and after grinding to a slight extent, grinding the damaged part finely by using low-granularity grinding sand paper; finally polishing with the most fine sand paper. If the damage of the sealing surface is slight, directly lapping by using grinding sand paper with low granularity and finally polishing as required;
(1.5) taking necessary measures such as personnel industrial safety protection, personnel radiation protection, equipment damage protection, system foreign matter prevention and the like aiming at the specific field environment of the regulating valve;
step two, repairing sealing surface of valve seat
After the damage degree of the sealing surface of the valve seat is evaluated, a reasonable repairing mode is adopted; uniformly sticking abrasive paper in an abrasive area of the repairing tool; after the pasting is finished, assembling the repair tool on the valve seat and uniformly rotating the repair tool; checking the repair condition of the sealing surface and the abrasion degree of the abrasive paper after grinding for a certain time, and replacing the abrasive paper before the effective grinding layer is consumed; gradually eliminating damage on the valve seat according to a correct grinding flow;
step three, blue oil test
Mounting the repairing tool on the valve seat and fastening the repairing tool by using two special bolts; uniformly coating a thin layer of blue oil on the valve core; the valve core is assembled on the valve seat through the valve core guide sleeve, and a certain pressing force is manually applied; slightly lifting the valve core from the valve seat, wherein the valve core is not required to deflect in the lifting process; after the repairing tool is removed, checking whether a sealing line formed by the contact of the valve core on the sealing surface of the valve seat and the valve seat is complete and clear;
fourth, valve element sealing surface repair
Carefully evaluating the damage part of the valve core sealing surface and adopting a reasonable repairing mode; uniformly sticking abrasive paper on the grinding areas of the repairing tool; after the sticking is finished, assembling the repair tool on the valve core and uniformly rotating the repair tool; checking the abrasion degree of the abrasive paper after grinding for a certain time, wherein the effective grinding layer needs to be replaced by a new grinding abrasive paper just before being consumed; after grinding for a certain time, observing the repair degree of the damaged part of the valve core sealing surface until the damage on the valve core sealing surface is thoroughly eliminated;
step five: inspection of valve core and valve seat sealing surface after grinding
After the valve seat and the valve core are repaired, a blue oil test is performed again; mounting the repairing tool on the valve seat again, and fastening by using two special bolts; and after the valve core coated with the blue oil is mounted on the valve seat through the guide sleeve, lifting the valve seat, removing the valve core guide sleeve, and checking whether a sealing line formed by the contact of the valve core on the sealing surface of the valve seat and the valve seat is complete and clear. According to the result of the blue oil test, if necessary, repeating the second step or the fifth step, and carrying out final grinding and finishing on the valve seat and the valve core until the final blue oil is detected to be qualified;
step six: online leakage rate test after valve reinstallation
And (3) the valve core and the valve seat which are ground and are subjected to seal surface inspection pass are installed on the valve body, the sealing performance of the valve core and the valve seat is inspected by pressing a system pipeline through an online test, if the valve core and the valve seat are qualified, the grinding effect is good, if the valve core and the valve seat are not qualified, the valve core and the valve seat are required to be disassembled again, and the seal surface is ground and inspected again according to the steps one to five until the valve core and the valve seat are qualified.
Examples
As shown in the accompanying drawings from 1 to 4, the invention provides an inspection and repair device for an adjusting valve with a C-shaped sealing ring on a valve core, which comprises a guide sleeve 1, a guide sleeve fixing bolt 2, a valve core grinding mould 3, a valve seat grinding mould 4, a valve core lifting device 5, abrasive paper for grinding and other consumable materials.
The guide sleeve is made of polytetrafluoroethylene, and the purpose of selecting a non-metal material is that if the guide sleeve is made of metal, the situation that the valve core is damaged due to jamming and friction between metals during valve core guiding exists. The external diameter of the guide sleeve is designed according to the diameter of the external end face of the valve seat, and the internal diameter is enlarged by 0.2mm on the basis of the diameter of the external end face of the valve core. The lower end of the guide sleeve is strictly referred to the matching size of the valve core and the valve seat to form a groove, and the concentricity of the guide sleeve and the valve seat can be ensured during guiding. In order to facilitate the fixation between the valve seat and the guide sleeve, two uniformly distributed through holes are drilled in the axial direction of the guide sleeve. The valve seat and the valve core are fixed together by designing two lengthened bolts through the hoisting holes of the valve seat. The specification of the bolt is the same as the specification of the thread of the lifting hole of the valve seat, and is 3/8-16UNC.
Wherein, the valve seat grinding mould is processed by stainless steel, and the surface is subjected to surface treatment such as quenching, so as to improve the hardness. The inner diameter of the mould is increased by 0.1mm on the basis of strictly referring to the outer diameter of the valve seat, so that the accurate centering of the mould and the valve seat during grinding is ensured. The outer diameter of the mould is selected to be small as much as possible on the basis of ensuring the strength, so that the weight of the mould is reduced. The central position of the mould is provided with a conical boss according to the angle of the sealing surface of the valve seat, the width of the conical boss can envelop the sealing surface of the whole valve seat and is enough to paste abrasive paper, and when actual grinding is carried out, the conical surface of the boss is tightly attached to the sealing surface of the valve seat, so that the centering performance of the valve seat and the mould is further enhanced. .
The valve core grinding mould is made of stainless steel, the inner diameter of the valve core grinding mould is increased by 0.02mm on the basis of strictly referring to the diameter of the outer end face of the valve core, and accurate guiding is achieved. The surface of the mould is quenched, so that the hardness of the mould is improved. In order to avoid the influence of the guide section on the grinding effect of the valve core sealing surface and the clamping fixture in the grinding process, a transition section is designed at the lower end of the guide section, and the diameter size of the transition section is increased by 4mm on the basis of the guide section. After the transition section, the lower end of the mould is provided with a conical surface according to the angle of the valve core, and the width of the conical surface can also envelop the sealing surface of the whole valve core and is enough to paste abrasive paper.
As shown in fig. 1 to fig. 4, the method for repairing the regulating valve with the C-shaped sealing ring on the valve core provided by the invention comprises the following steps:
step one, valve core and valve seat inspection and repair preparation
01. Checking a sealing surface: the internal leakage phenomenon of the valve is known in the hot test stage of the power plant, and after each part of the valve is removed, the sealing surfaces of the valve core and the valve seat are firstly checked in detail. By checking, a relatively obvious defect on the sealing surface of the valve seat can be locked, and the appearance of the valve core is basically good. The defect position is marked, so that the reference in the subsequent repair is facilitated.
02. Damaged sealing surface evaluation: careful measurement and assessment of the location of damage to the sealing surface can determine that the damage is minor because the damaged location area is small and the damaged depth is shallow.
03. And (3) repairing a sealing surface by adopting the following modes: because the damage of the sealing surface is slight, the sealing surface is not required to be subjected to primary rough repair in a turning mode. A special tool (valve seat grinding jig) may be used for repair.
04. And (3) grinding a sealing surface: since the damage of the sealing surface is slight, 30 mu sand paper can be directly selected to grind the sealing surface during repair. When the defect position in the visual inspection is basically eliminated, the 9 mu or 12 mu sand paper is selected to repair the sealing surface until the defect position in the visual inspection is completely eliminated. Finally, the sealing surface is polished by using the sand paper with the maximum diameter of 6 mu.
05. The method is characterized in that necessary measures such as personnel industrial safety protection, personnel radiation protection, equipment damage protection, system foreign matter prevention and the like are adopted aiming at the specific field environment of valve core and valve seat repair of the regulating valve.
Step two, repairing sealing surface of valve seat
Repairing the sealing surface of the valve seat according to the selected flow:
01. the valve seat 6 and the valve seat grinding mould 4 are cleaned, so that the sealing surfaces of the valve seat 6 and the valve seat grinding mould 4 are clean and tidy;
02. sticking 30 mu sand paper to a valve seat grinding mould 4, assembling the mould to a valve seat 6, and uniformly rotating the mould to grind a sealing surface;
03. after grinding for a certain time, visually checking the sealing surface, repeating the 01/02 th step when the defect position in the sealing surface of the valve seat is basically eliminated, and replacing 30 mu of abrasive paper with 12 mu of abrasive paper to continuously repair and grind the sealing surface;
04. after grinding for a certain time, the sealing surface is visually inspected until the defect position has been completely eliminated. At this time, the 01/02 th step was repeated, and the sealing surface was polished with 6. Mu. Sandpaper. By grinding the valve seat 6 with a special tool (valve seat grinding jig 4), defects on the valve seat have been completely eliminated.
Step three: blue oil test
01. The valve seat 6, the valve core 5 and the guide sleeve 1 are cleaned, so that the cleanness and the neatness of all parts are ensured;
02. uniformly coating a thin layer of Prussian blue oil on the valve seat 6;
03. the valve core guide sleeve 1 is installed on the valve seat 6 and is fastened by two special bolts;
04. the valve core 5 is assembled on the valve seat 6 through the valve core guide sleeve 1 by a hoisting device, and a certain pressing force is applied manually and uniformly;
05. the valve core 5 is lifted from the valve seat 6 gently by the valve core lifting device 9, and the valve core is not inclined in the lifting process;
06. the valve core guide sleeve 1 is removed and the integrity of the seal line on the valve seat sealing surface is checked. Through a blue oil test, a broken line is found at the sealing line of the valve core 5 and the valve seat 6;
07. and repeating the steps 01 to 06 for a plurality of times, after confirming that the sealing surface of the valve seat is good, changing the contact position of the valve core 5 and the valve seat 6 in each repeated process, finally locking the defect at the valve core, and confirming that the defect is the same as the defect formation type on the valve seat 6 after observing by using a magnifying glass.
Fourth, valve element sealing surface repair
Since the types of defects on the valve core 5 and the valve seat 6 are the same, repairing the defects of the sealing surface of the valve core according to the grinding repairing flow of the valve seat comprises the following steps:
01. the valve core 5 and the valve core grinding mould 3 are cleaned, so that the sealing surfaces of the valve core 5 and the valve core grinding mould are clean and tidy;
02. the valve core 5 is fixed on a special placement device 11;
03. sticking 30 mu sand paper to a valve core grinding mould 3, assembling the mould to a valve core 5, and uniformly rotating the mould to grind a sealing surface;
04. after grinding for a certain time, visually checking the sealing surface, repeating the 01/02 th step when the defect position in the valve core sealing surface is basically eliminated, and replacing 30 mu of abrasive paper with 12 mu of abrasive paper to continuously repair and grind the sealing surface;
05. after grinding for a certain time, the sealing surface is visually inspected until the defect position has been completely eliminated. At this time, the 01/02 th step was repeated, and the sealing surface was polished with 6. Mu. Sandpaper. By grinding the spool 5 using a special tool (spool grinding jig 3), the defects on the spool have been completely eliminated.
Step five, checking the sealing surface of the valve core and the valve seat after grinding
By executing the first to fourth steps, the sealing surfaces of the valve core 5 and the valve seat 6 are basically repaired, and the fitting degree of the sealing surfaces of the valve core 5 and the valve seat 6 needs to be finally confirmed according to the following steps:
01. confirm the valve core 5 and valve seat 6 sealing surface are intact, the damage is not damaged after grinding;
02. the valve seat 6, the valve core 5 and the guide sleeve 1 are cleaned, so that the cleanness and the neatness of all parts are ensured;
03. uniformly coating a thin layer of Prussian blue oil on the valve seat 6;
04. the valve core guide sleeve 1 is installed on the valve seat 6 and is fastened by two special bolts;
05. the valve core 5 is assembled on the valve seat 6 through the valve core guide sleeve 1 by the lifting device 9, and a certain pressing force is applied manually and uniformly;
06. the valve core 5 is lifted from the valve seat 6 gently by the lifting device 9, and the lifting process is not deviated;
07. the valve core guide sleeve 1 is removed and the integrity of the seal line on the sealing surface of the valve seat 6 is checked. By means of blue oil test, it is confirmed that the sealing line of the valve core 5 and the valve seat 6 is in good contact, and the indentation is uniform and no broken line exists.
Step six: online leakage rate test after valve reinstallation
By performing steps one to five, repair and inspection of the damaged sealing surface of the valve has been substantially completed, and then the valve core 5 and the valve seat 6 and the cage are installed into the valve body, fastened according to the drawing and the service manual. And then, pressing a system pipeline where the valve is positioned by using on-line test equipment, and judging whether the sealing performance of the valve is good or not according to the result of a pressing test. The detection of the on-line test equipment shows that the actual leakage rate of the valve is 62sccm when the pressure difference is 85.12psi, and the design requirement of the valve is met.
Claims (1)
1. The utility model provides a case has C type ring auxiliary seal's governing valve repair methods, realizes based on that case has C type ring auxiliary seal's governing valve repair tool which characterized in that: the regulating valve repairing tool comprises a guide sleeve (1), a valve seat grinding mould (4) and a valve core grinding mould (3), wherein two uniformly distributed through holes are axially formed in the guide sleeve (1), and two lengthened bolts penetrate through the through holes to fix a valve seat (6) and a valve core (5); the valve seat grinding mould (4) is manufactured by adopting stainless steel, the surface is subjected to quenching surface treatment, the inner diameter of the mould is strictly referred to the outer diameter of the valve seat to realize accurate centering, the inner diameter and the outer diameter of the guide sleeve (1) are strictly designed according to the assembling positions of the valve core (5) and the valve seat (6), the center position of the valve seat grinding mould (4) is provided with a conical boss according to the angle of the valve seat sealing surface, the width of the conical boss can envelop the whole valve seat sealing surface and is enough to be adhered with grinding sand paper, the conical surface of the boss is tightly adhered with the valve seat sealing surface during grinding, the valve core grinding mould is manufactured by adopting stainless steel, the inner diameter of the valve core grinding mould is increased by a guide section on the basis of strictly referring to the diameter of the outer end surface of the valve core, the lower end of the guide section is provided with a transition section, after the transition section is passed, the lower end of the mould is provided with a conical surface according to the angle of the valve core, and the width of the conical surface can envelop the sealing surface of the whole valve core, and the grinding sand paper is sufficiently adhered;
the method comprises the following steps:
step one, valve core and valve seat inspection and repair preparation
(1.1) inspection of sealing surfaces: the internal leakage phenomenon of the valve is known by combining system debugging and state feedback of the valve in production operation, and after each part of the valve is removed, the sealing surfaces of the valve core and the valve seat are checked by using a flashlight or a special checking tool; the specific mark is carried out on the defect on the locking sealing surface after the specific position of the defect is locked, so that the defect can be conveniently and subsequently ground and can be referred to in the process of rechecking;
(1.2) damaged sealing surface assessment: carefully measuring and evaluating the damaged position of the sealing surface, and selecting a proper repairing mode and a grinding flow of the sealing surface according to an evaluation result;
(1.3) sealing surface restoration mode: according to the damage degree, if the damage is serious, if deeper pit and scratch defects occur, firstly, proper turning is determined by referencing materials and factors of a build-up welding layer, the damaged part of the sealing surface is reduced to the degree that the damaged part can be repaired in a grinding mode, and then a repairing tool is used for repairing; in addition, if the sealing surface is seriously damaged but is not enough to be repaired for the first time by adopting a machining mode, a repair tool is used for repairing;
(1.4) seal face grinding procedure: if the damage of the sealing surface is heavier, firstly, grinding the sealing surface roughly by using high-granularity grinding sand paper, and after grinding to a slight extent, grinding the damaged part finely by using low-granularity grinding sand paper; finally polishing with the most fine sand paper; if the damage of the sealing surface is slight, directly lapping by using grinding sand paper with low granularity and finally polishing as required;
(1.5) taking necessary personnel and industry safety protection, personnel radiation protection, equipment damage protection and system foreign matter prevention measures aiming at the specific field environment of the regulating valve;
step two, repairing sealing surface of valve seat
After the damage degree of the sealing surface of the valve seat is evaluated, a reasonable repairing mode is adopted; uniformly sticking abrasive paper in an abrasive area of the repairing tool; after the pasting is finished, assembling the repair tool on the valve seat and uniformly rotating the repair tool; checking the repair condition of the sealing surface and the abrasion degree of the abrasive paper after grinding for a certain time, and replacing the abrasive paper before the effective grinding layer is consumed; gradually eliminating damage on the valve seat according to a correct grinding flow;
step three, blue oil test
Mounting the repairing tool on the valve seat and fastening the repairing tool by using two special bolts; uniformly coating a thin layer of blue oil on the valve core; the valve core is assembled on the valve seat through the guide sleeve, and a certain pressing force is manually applied; slightly lifting the valve core from the valve seat, wherein the valve core is not required to deflect in the lifting process; after the repairing tool is removed, checking whether a sealing line formed by the contact of the valve core on the sealing surface of the valve seat and the valve seat is complete and clear;
fourth, valve element sealing surface repair
Carefully evaluating the damage part of the valve core sealing surface and adopting a reasonable repairing mode; uniformly sticking abrasive paper in an abrasive area of the repairing tool; after the sticking is finished, assembling the repair tool on the valve core and uniformly rotating the repair tool; checking the abrasion degree of the abrasive paper after grinding for a certain time, wherein the effective grinding layer needs to be replaced by a new grinding abrasive paper just before being consumed; after grinding for a certain time, observing the repair degree of the damaged part of the valve core sealing surface until the damage on the valve core sealing surface is thoroughly eliminated;
step five: inspection of valve core and valve seat sealing surface after grinding
After the valve seat and the valve core are repaired, a blue oil test is performed again; mounting the repairing tool on the valve seat again, and fastening by using two special bolts; after the valve core coated with blue oil is mounted on the valve seat through the guide sleeve, the valve seat is lifted, the guide sleeve is removed, and whether a sealing line formed by the contact of the valve core on the sealing surface of the valve seat and the valve seat is complete and clear is checked; according to the result of the blue oil test, if necessary, repeating the second step or the fifth step, and carrying out final grinding and finishing on the valve seat and the valve core until the final blue oil is detected to be qualified;
step six: online leakage rate test after valve reinstallation
And (3) the valve core and the valve seat which are ground and are subjected to seal surface inspection pass are installed on the valve body, the sealing performance of the valve core and the valve seat is inspected by pressing a system pipeline through an online test, if the valve core and the valve seat are qualified, the grinding effect is good, if the valve core and the valve seat are not qualified, the valve core and the valve seat are required to be disassembled again, and the seal surface is ground and inspected again according to the steps one to five until the valve core and the valve seat are qualified.
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| CN110695846A (en) * | 2019-09-26 | 2020-01-17 | 沪东重机有限公司 | Diesel engine cylinder cover sealing surface inspection and grinding device and using method thereof |
| CN110814861A (en) * | 2019-10-24 | 2020-02-21 | 湖南金箭新材料科技有限公司 | Repairing method for mechanical seal |
| CN111805356A (en) * | 2020-06-19 | 2020-10-23 | 大唐七台河发电有限责任公司 | Quick grinder of stop valve |
| CN113927379B (en) * | 2021-10-29 | 2022-10-11 | 三门核电有限公司 | Method for repairing valve seat of electromagnetic valve and electromagnetic valve |
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