CN106312438A - Overhaul process for sealing surface of valve - Google Patents
Overhaul process for sealing surface of valve Download PDFInfo
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- CN106312438A CN106312438A CN201610464432.7A CN201610464432A CN106312438A CN 106312438 A CN106312438 A CN 106312438A CN 201610464432 A CN201610464432 A CN 201610464432A CN 106312438 A CN106312438 A CN 106312438A
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- welding
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- sealing surface
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- 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
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Arc Welding In General (AREA)
Abstract
The invention relates to the field of valve overhaul, and specifically relates to an overhaul process for a sealing surface of a valve. The invention discloses an overhaul process for a sealing surface of a valve. The process is mature, and capable of effectively repairing cracks, blowing loss, cavitation, scratches, indentations and other defects generated by the valve. The overhaul process disclosed by the invention has the following advantages: the process is mature, and the cracks, blowing loss, cavitation, scratches, indentations and other defects generated by the valve can be effectively repaired through a complete process flow and operation scheme, thus the cost of the valve is reduced.
Description
Technical field
The present invention relates to valve maintenance field, be specifically related to a kind of valve sealing face maintenance craft.
Background technology
Valve is the vitals in tubing, the circulation medium that its effect is to turn on or blocks in pipeline, or
For regulating, control flow and the pressure of medium.It is related to pipeline and equipment economy, the operation of safety.
The use of valve requires: performance well reliable, intensity height is safe, flexible to operation, easy to maintenance.Thermopower system
System, the tightness of valve sealing face, it is to reduce cost of electricity-generating, improves generatine set heat efficiency, energy-saving and cost-reducing key, the sealing of valve
Face be easiest to crack, blow loss, cavitate, pull, the defect such as impression, therefore we must pay attention to the inspection of the sealing surface of valve
Repair quality work.
Summary of the invention
In order to solve the problems referred to above, the present invention proposes a kind of valve sealing face maintenance craft, and technical maturity can be effective
Ground to crackle, blow loss produced by valve, cavitate, pull, the defect such as impression is effectively repaired.
In order to reach foregoing invention purpose, the present invention proposes techniques below scheme:
Valve sealing face maintenance craft, is characterized in particular in following steps:
1) slight blow loss, cavitate, pull, the defect such as impression, the degree of depth is less than 0.20mm, can select special grinding work
Tool, is ground eliminating defect；
2) more serious blow loss, cavitate, pull, the defect such as impression, the degree of depth is in 0.20mm～0.50mm, lacking depending on concrete sealing surface
Depending on the area fallen into and the thickness of former alloy-layer, if sealing surface local is a bit, and the alloy-layer of sealing surface is thin, should take partial points
Weldering mode repair welding alloy-layer, then be machined out, milled processed.If defect area is big, and alloy-layer is thin, should machine car pin its
Defect, prevents electric welding from producing bubble, being mingled with, then carries out boxing repair welding alloy-layer, by machining, milled processed；
3) integral sealing area, damaged area reach more than 50% or the deepest defect of lesion depths, it is necessary to complete to original alloy-layer
Full car removes, hardfacing alloy layer again, according to mother metal and wlding material, chooses excessive layer, and guarantees the relative thickness of excessive layer, with
Stress cracking, then boxing alloy-layer is produced after exempting from alloy-layer welding machine.Deng cooling after be machined out again, milled processed；
4) sealing surface has crackle, it can be carried out polishing and mend prioritizing selection by replacing a damaged part, must detect a flaw, reexamine after processing completion,
Guarantee to eradicate defect；If crack depth is the deepest, deep and to mother metal, mending by replacing a damaged part is to eliminate its defect, the spare unit generation that should more renew
For it.
For above-mentioned valve sealing face maintenance craft the 3rd) processing step involved by repair welding described in step is as follows:
The first step: confirm the material of former sealing surface, selects the different welding rods being suitable for enter according to the working environment of valve with operating mode
Row repair welding；
Second step: the selection of wlding is preferentially to use former sealing surface alloy material wlding repair welding, if scene does not possesses or requires not
Height, can be selected for equal performance wlding；High-temperature high pressure valve on jet chimney, most former sealing surface is all STL cobalt-base alloys, on-the-spot
Can be selected for the welding rod substitute of model D547Mo and D802, the specification of welding rod is Φ 3.2mm, Φ 4mm and Φ 5mm, lacks according to defect
The size of mouth, selects the welding rod of the diameter being suitable for.
3rd step: during on-the-spot built-up welding, preheats workpiece initially with special equipment, and wlding and mother metal according to selecting determine
Preheating temperature and preheating time.
4th step: welding rod bakees: use Electric heat oven that welding rod is warmed；D547Mo model welding rod is heated to
250-300 DEG C, it is incubated 1.5h；Use Electric heat oven that D802 model welding rod is heated to 530-550 DEG C, be incubated 2h.
5th step: bead-welding technology:
1) selecting suitable welding rod, from the outside starting the arc of welding bead, short arc welding, along weldering one week, should there be the whip stitch of 1cm in lap-joint；
2) the then starting the arc inside welding bead, in the same way along weldering；
3) from the center starting the arc of welding bead, short arc welding, along weldering one week, and reliably overlap with interior outside welding bead, prevent not having through welding
And slag inclusion；
4) one layer be soldered after, weld the second layer in the same fashion, during the starting the arc, avoid the receipts acnode of preceding layer, through receipts acnode putting
Jogging speed, makes lower floor's pore and slag inclusion fully discharge, the most repeatedly, until terminating；
5) at the end of each layer, all should coating be removed clean, and under cutting and wanting multiple spot several when receiving arc every time, fill up arc crater；
6th step: send stove inside holding to be tempered the most again: heat up after being soldered tempering, comes out of the stove below slow cooling to 200 DEG C；
7th step: inspection: sealing surface thickness gauge fault detection: check after machining, overlay cladding thickness:>2mm,<4mm, coloring inspection
Test rate 100%, welding position is carried out radiographic inspection, when the weld defect that cannot remove occurs in sealing surface, overlay cladding gold should be removed
Belonging to and doing over again, repair welding number of times is less than twice.
For above-mentioned valve sealing face maintenance craft the 4th) to mend involved processing step by replacing a damaged part as follows for the polishing described in step:
1) sealing surface defect excavation-filling principle: defect area reaches whole sealing surface more than 50% person frequently with turnery processing, removes original
Alloy-layer, reselect prime material bottoming boxing, preheat boxing alloy-layer again by welding procedure, carry out heat treatment；To lacking
Falling into the sealing surface deep, defect is longer, local need to be excavated former alloy-layer, repair welding after preheating thoroughly, be prevented its defect the most thorough
The end, removes, and affects welding quality, produces stress cracking, the defect of welding bubble；Surface is pulled, blow loss and area little lack
Falling into and use mechanical grinding to process, blemish surface requirement is smooth excessively, it is simple to repair welding；
2) alloy-layer repair welding, the mother metal tackling valve sealing face before welding and the alloy wlding needing built-up welding carry out spectrum analysis,
Prevent from misusing wlding；Wlding should eliminate rust before use, greasy dirt, dirt；Welding rod should toast before using, and repeats baking and must not exceed two
Secondary, special-purpose thermal insulation bucket should be loaded, with take with；Weld bond excavation-filling method should use mechanical grinding, must not use flame cutting；Mend by replacing a damaged part
Groove and the oil of neighbouring mother metal, paint, dirt, rust etc. are cleaned out, until sending metallic luster, it is simple to repair welding；Before the weldering of alloy material
Must preheat, postwelding should heat treatment in time, strict perform by " thermal power plant sweating heat treatment technology code "；Hardness is defective
Weld bond need to re-start heat treatment；Process of patch weld uses multi-layer multi-pass welding mode, incremental.
It is an advantage of the invention that technical maturity, by a set of perfect technological process, operation scheme, valve can be produced
Raw crackle, blow loss, cavitate, pull, the defect such as impression is effectively repaired, and reduces valve cost.
Detailed description of the invention
The process of the sealing surface defects such as embodiment one, regulation valve, stop valve, non-return valve: the spool valve seat of this kind of valve is all
Being regular circle shapes, common are flat seal, conical surface seal, ball face sealing etc., the defect on sealing surface is easy to handle:
The most slight blow loss, cavitate, pull, the defect such as impression, the degree of depth is less than 0.20mm, can select special grinding work
Tool, is ground eliminating defect；
The most more serious blow loss, cavitate, pull, the defect such as impression, the degree of depth is in 0.20mm～0.50mm, lacking depending on concrete sealing surface
Depending on the area fallen into and the thickness of former alloy-layer, if sealing surface local is a bit, and the alloy-layer of sealing surface is thin, should take partial points
Weldering mode repair welding alloy-layer, then be machined out, milled processed.If defect area is big, and alloy-layer is thin, should machine car pin its
Defect (prevents electric welding from producing bubble, being mingled with), then carries out boxing repair welding alloy-layer, by machining, milled processed.
3. integral sealing area, damaged area reach more than 50% or the deepest defect of lesion depths, it is necessary to original alloy
Layer car completely removes, and hardfacing alloy layer again, according to mother metal and wlding material, is chosen excessive layer, and guaranteed the relative thick of excessive layer
Degree, in order to avoid producing stress cracking, then boxing alloy-layer after alloy-layer welding machine.Deng cooling after be machined out again, milled processed.
4. sealing surface has crackle, it can be carried out polishing and mend by replacing a damaged part, must do flaw detection and reexamine after processing completion, if crackle
The degree of depth is the deepest, deep and to mother metal, and mending by replacing a damaged part is to eliminate its defect, and the spare unit that should more renew replace it.
Embodiment two, the process of Gate-valve sealing planar defect: the flashboard of gate valve, valve seat cooperation multimodal various, have wedge shape close
Envelope；There is flat seal；There is single facer；In addition to the flatness, fineness of sealing surface to be ensured, also to ensure its angle
Degree coordinates；
1. parallel slide valve, slight blow loss, cavitate, pull, the defect such as impression, the degree of depth is less than 0.20mm, can select specially
Milling tool, be ground eliminate defect；
The most more serious blow loss, cavitate, pull, the defect such as impression, the degree of depth is at 0.20mm～0.50mm, and flashboard is typically taked to dig
Mending, correction of then polishing, then integral grinding ensures flatness and the fineness of whole plane, and valve seat uses spot welding repair damage
Breach, after polishing high point, grinds guarantee flatness and the fineness of whole plane, during grinding, observes adjustment more with grinder, with
Exempt to grind mill on the high side, make former Angulation changes.
3. flashboard, valve seat integral sealing area, damaged area reach more than 50% or the deepest defect of lesion depths, and valve seat is most
Amount take local repair welding process, if gross area reparation valve seat can be made to be heated after stress deformation, angle of valve seat change, even produce split
Stricture of vagina.Flashboard is easily processed, and former sealing surface turning or uses angle grinding machine polishing blemish surface to ensure smooth (preventing former by lathe
On sealing surface, electric welding produces bubble, is mingled with), hardfacing alloy layer is ground by machining again.Must be before sealing surface weld deposit
Flashboard is clipped on lathe, needs the flashboard face centering of built-up welding, together unloads together with chuck, or in the middle part of former flashboard processing plane with
Ram seal face is parallel face, does centering basis for second time clamping processing boxing sealing surface, prevents flashboard Angulation changes.
4. there is crackle in ram seal face, can mend by replacing a damaged part it is carried out polishing, must do flaw detection and reexamine after processing completion,
If crack depth is the deepest, deep and to mother metal, mending by replacing a damaged part is to eliminate its defect, and the spare unit that should more renew replace it.Valve seat has and splits
Stricture of vagina, great majority cannot excavation filling mend, without repair be worth, it is proposed that change valve, or return factory and office reason.
The most all relate to repair welding soldering, it is necessary to its original material carries out spectrum analysis (or has material report
Accuse list etc.), determine wlding and welding procedure, carry out heat treatment, the repair welding etc. being correlated with according to corresponding welding procedure.
Using environment, circulation medium, operating pressure, temperature etc. according to valve, the mother metal of valve selects different materials, seals
Face hard alloy is also corresponding difference, and all say more than us is the sealing surface repair mode method of hard alloy.If it is soft
The sealing surfaces such as sealing or pottery, are the most all to change or spraying reparation, the most not specifically.
Claims (3)
1. valve sealing face maintenance craft, it is characterised in that following steps:
1) slight blow loss, cavitate, pull, impression defect, the degree of depth is less than 0.20mm, can select special milling tool,
It is ground eliminating defect；
2) more serious blow loss, cavitate, pull, impression defect, the degree of depth is at 0.20mm～0.50mm, depending on the defect of concrete sealing surface
Area and former alloy-layer thickness depending on, if sealing surface local is the most a bit, and the alloy-layer of sealing surface is thin, should take local spot welding
Mode repair welding alloy-layer, then be machined out, milled processed；If defect area is big, and alloy-layer is thin, and it lacks should to machine car pin
Fall into, prevent electric welding from producing bubble, being mingled with, then carry out boxing repair welding alloy-layer, by machining, milled processed；
3) integral sealing area, damaged area reach more than 50% or the deepest defect of lesion depths, it is necessary to complete to original alloy-layer
Full car removes, hardfacing alloy layer again, according to mother metal and wlding material, chooses excessive layer, and guarantees the relative thickness of excessive layer, with
Stress cracking, then boxing alloy-layer is produced after exempting from alloy-layer welding machine；Deng cooling after be machined out again, milled processed；
4) sealing surface has crackle, it can be carried out polishing and mend prioritizing selection by replacing a damaged part, must detect a flaw, reexamine after processing completion,
Guarantee to eradicate defect；If crack depth is the deepest, deep and to mother metal, mending by replacing a damaged part is to eliminate its defect, the spare unit generation that should more renew
For it.
Valve sealing face maintenance craft the most according to claim 1, is characterized in that the 3rd) involved by the repair welding described in step
Processing step as follows:
The first step: confirm the material of former sealing surface, selects the different welding rods being suitable for enter according to the working environment of valve with operating mode
Row repair welding；
Second step: the selection of wlding is preferentially to use former sealing surface alloy material wlding repair welding, if scene does not possesses or requires not
Height, can be selected for equal performance wlding；High-temperature high pressure valve on jet chimney, most former sealing surface is all STL cobalt-base alloys, on-the-spot
Can be selected for the welding rod substitute of model D547Mo and D802, the specification of welding rod is Φ 3.2mm, Φ 4mm and Φ 5mm, lacks according to defect
The size of mouth, selects the welding rod of the diameter being suitable for；
3rd step: during on-the-spot built-up welding, preheats workpiece initially with special equipment, and wlding and mother metal according to selecting determine preheating
Temperature and preheating time；
4th step: welding rod bakees: use Electric heat oven that welding rod is warmed；D547Mo model welding rod is heated to 250-
300 DEG C, it is incubated 1.5h；Use Electric heat oven that D802 model welding rod is heated to 530-550 DEG C, be incubated 2h；
5th step: bead-welding technology:
1) selecting suitable welding rod, from the outside starting the arc of welding bead, short arc welding, along weldering one week, should there be the whip stitch of 1cm in lap-joint；
2) the then starting the arc inside welding bead, in the same way along weldering；
3) from the center starting the arc of welding bead, short arc welding, along weldering one week, and reliably overlap with interior outside welding bead, prevent not having through welding
And slag inclusion；
4) one layer be soldered after, weld the second layer in the same fashion, during the starting the arc, avoid the receipts acnode of preceding layer, through receipts acnode putting
Jogging speed, makes lower floor's pore and slag inclusion fully discharge, the most repeatedly, until terminating；
5) at the end of each layer, all should coating be removed clean, and under cutting and wanting multiple spot several when receiving arc every time, fill up arc crater；
6th step: send stove inside holding to be tempered the most again: heat up after being soldered tempering, comes out of the stove below slow cooling to 200 DEG C；
7th step: inspection: sealing surface thickness gauge fault detection: check after machining, overlay cladding thickness:>2mm,<4mm, coloring inspection
Test rate 100%, welding position is carried out radiographic inspection, when the weld defect that cannot remove occurs in sealing surface, overlay cladding gold should be removed
Belonging to and doing over again, repair welding number of times is less than twice.
Valve sealing face maintenance craft the most according to claim 1, is characterized in that the 4th) polishing described in step mends institute by replacing a damaged part
The processing step related to is as follows:
1) sealing surface defect excavation-filling principle: defect area reaches whole sealing surface more than 50% person frequently with turnery processing, removes original
Alloy-layer, reselect prime material bottoming boxing, preheat boxing alloy-layer again by welding procedure, carry out heat treatment；To lacking
Falling into the sealing surface deep, defect is longer, local need to be excavated former alloy-layer, repair welding after preheating thoroughly, be prevented its defect the most thorough
The end, removes, and affects welding quality, produces stress cracking, the defect of welding bubble；Surface is pulled, blow loss and area little lack
Falling into and use mechanical grinding to process, blemish surface requirement is smooth excessively, it is simple to repair welding；
2) alloy-layer repair welding, the mother metal tackling valve sealing face before welding and the alloy wlding needing built-up welding carry out spectrum analysis,
Prevent from misusing wlding；Wlding should eliminate rust before use, greasy dirt, dirt；Welding rod should toast before using, and repeats baking and must not exceed two
Secondary, special-purpose thermal insulation bucket should be loaded, with take with；Weld bond excavation-filling method should use mechanical grinding, must not use flame cutting；Mend by replacing a damaged part
Groove and the oil of neighbouring mother metal, paint, dirt, rust are cleaned out, until sending metallic luster, it is simple to repair welding；Must before the weldering of alloy material
Must preheating, postwelding should heat treatment in time, strict by " thermal power plant sweating heat treatment technology code " execution；The defective weldering of hardness
Mouth need to re-start heat treatment；Process of patch weld uses multi-layer multi-pass welding mode, incremental.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610464432.7A CN106312438A (en) | 2016-06-24 | 2016-06-24 | Overhaul process for sealing surface of valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610464432.7A CN106312438A (en) | 2016-06-24 | 2016-06-24 | Overhaul process for sealing surface of valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106312438A true CN106312438A (en) | 2017-01-11 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610464432.7A Withdrawn CN106312438A (en) | 2016-06-24 | 2016-06-24 | Overhaul process for sealing surface of valve |
Country Status (1)
| Country | Link |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107855736A (en) * | 2017-11-07 | 2018-03-30 | 华润电力湖北有限公司 | A kind of conical surface seal grinding-in of valve technique |
| CN108019547A (en) * | 2017-12-04 | 2018-05-11 | 青海中控太阳能发电有限公司 | A kind of technical method to valve maintenance |
| CN110014264A (en) * | 2019-05-23 | 2019-07-16 | 国家能源投资集团有限责任公司 | Feed pump cylinder sealing surface method for repairing and mending |
| CN112122878A (en) * | 2020-09-17 | 2020-12-25 | 大连水泥集团有限公司 | Method for repairing surface defects of rotary kiln supporting roller |
-
2016
- 2016-06-24 CN CN201610464432.7A patent/CN106312438A/en not_active Withdrawn
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107855736A (en) * | 2017-11-07 | 2018-03-30 | 华润电力湖北有限公司 | A kind of conical surface seal grinding-in of valve technique |
| CN108019547A (en) * | 2017-12-04 | 2018-05-11 | 青海中控太阳能发电有限公司 | A kind of technical method to valve maintenance |
| CN110014264A (en) * | 2019-05-23 | 2019-07-16 | 国家能源投资集团有限责任公司 | Feed pump cylinder sealing surface method for repairing and mending |
| CN112122878A (en) * | 2020-09-17 | 2020-12-25 | 大连水泥集团有限公司 | Method for repairing surface defects of rotary kiln supporting roller |
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Application publication date: 20170111 |