CN102416387A - On-line cleaning device and method for ball valve overhauling seal - Google Patents
On-line cleaning device and method for ball valve overhauling seal Download PDFInfo
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- CN102416387A CN102416387A CN201110297778XA CN201110297778A CN102416387A CN 102416387 A CN102416387 A CN 102416387A CN 201110297778X A CN201110297778X A CN 201110297778XA CN 201110297778 A CN201110297778 A CN 201110297778A CN 102416387 A CN102416387 A CN 102416387A
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- ball valve
- maintenance sealing
- water
- maintenance
- cleaning device
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- 238000004140 cleaning Methods 0.000 title claims abstract description 52
- 238000000034 method Methods 0.000 title claims abstract description 18
- 238000012423 maintenance Methods 0.000 claims abstract description 81
- 238000007789 sealing Methods 0.000 claims abstract description 64
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 36
- 239000012459 cleaning agent Substances 0.000 claims abstract description 14
- 230000000694 effects Effects 0.000 claims abstract description 12
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims abstract description 11
- 238000011010 flushing procedure Methods 0.000 claims abstract description 11
- 229910017604 nitric acid Inorganic materials 0.000 claims abstract description 11
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 claims abstract description 9
- 239000002253 acid Substances 0.000 claims abstract description 7
- 230000008569 process Effects 0.000 claims abstract description 7
- 238000006243 chemical reaction Methods 0.000 claims abstract description 5
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims abstract description 5
- 238000002161 passivation Methods 0.000 claims abstract description 5
- 239000002351 wastewater Substances 0.000 claims abstract description 5
- 229910001220 stainless steel Inorganic materials 0.000 claims description 14
- 238000007689 inspection Methods 0.000 claims description 13
- 230000002378 acidificating effect Effects 0.000 claims description 11
- 239000010935 stainless steel Substances 0.000 claims description 11
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 claims description 9
- 238000005554 pickling Methods 0.000 claims description 9
- 239000000463 material Substances 0.000 claims description 7
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 claims description 6
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 6
- KCXVZYZYPLLWCC-UHFFFAOYSA-N EDTA Chemical compound OC(=O)CN(CC(O)=O)CCN(CC(O)=O)CC(O)=O KCXVZYZYPLLWCC-UHFFFAOYSA-N 0.000 claims description 5
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 4
- 238000005266 casting Methods 0.000 claims description 4
- 238000005260 corrosion Methods 0.000 claims description 4
- 230000007797 corrosion Effects 0.000 claims description 4
- 239000012530 fluid Substances 0.000 claims description 4
- 239000012535 impurity Substances 0.000 claims description 4
- 239000003112 inhibitor Substances 0.000 claims description 4
- 229910044991 metal oxide Inorganic materials 0.000 claims description 4
- 150000004706 metal oxides Chemical class 0.000 claims description 4
- 230000036632 reaction speed Effects 0.000 claims description 4
- 230000008439 repair process Effects 0.000 claims description 4
- RYFMWSXOAZQYPI-UHFFFAOYSA-K trisodium phosphate Chemical compound [Na+].[Na+].[Na+].[O-]P([O-])([O-])=O RYFMWSXOAZQYPI-UHFFFAOYSA-K 0.000 claims description 4
- 230000007613 environmental effect Effects 0.000 claims description 3
- LNOPIUAQISRISI-UHFFFAOYSA-N n'-hydroxy-2-propan-2-ylsulfonylethanimidamide Chemical compound CC(C)S(=O)(=O)CC(N)=NO LNOPIUAQISRISI-UHFFFAOYSA-N 0.000 claims description 3
- 230000001681 protective effect Effects 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 2
- 229910052751 metal Inorganic materials 0.000 claims description 2
- 239000008399 tap water Substances 0.000 abstract 4
- 235000020679 tap water Nutrition 0.000 abstract 4
- 230000002035 prolonged effect Effects 0.000 abstract 2
- 238000005406 washing Methods 0.000 abstract 2
- 239000003513 alkali Substances 0.000 abstract 1
- 238000006386 neutralization reaction Methods 0.000 abstract 1
- NDLPOXTZKUMGOV-UHFFFAOYSA-N oxo(oxoferriooxy)iron hydrate Chemical compound O.O=[Fe]O[Fe]=O NDLPOXTZKUMGOV-UHFFFAOYSA-N 0.000 abstract 1
- 239000002904 solvent Substances 0.000 abstract 1
- 229960001484 edetic acid Drugs 0.000 description 4
- 230000009467 reduction Effects 0.000 description 3
- 238000003860 storage Methods 0.000 description 3
- 238000011144 upstream manufacturing Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000008676 import Effects 0.000 description 2
- 238000010977 unit operation Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
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Abstract
The invention discloses an on-line cleaning method for a ball valve overhauling seal in a range of overhauling and maintenance of power plant equipment. The method comprises the following steps of: selecting an on-line cleaning device, a cleaning agent and cleaning processes, withdrawing the ball valve overhauling seal, flushing with tap water, washing with acid, flushing with tap water after the acid washing, adding an alkali solvent for neutralization, flushing with tap water, performing surface passivation and flushing with tap water; and checking the cleaning effect. Nitric acid is used as a main cleaning agent and has strong capability of dissolving water scales, ferric oxide and rust scales and high reaction rate, and the reacted waste water is easily treated; and by cleaning the water scales of the throwing and withdrawing cavities of the ball valve overhauling seal, the service life of a ball valve sealing ring can be prolonged, the ball valve overhauling period is prolonged, the water leakage of a unit in a halting state is effectively reduced, the running safety and the running stability of the unit are improved, and the economic running capability of the unit is improved.
Description
Technical field
The invention belongs to electric power factory equipment repair and maintenance scope, particularly a kind of ball valve maintenance online cleaning device of sealing and method.
Background technology
Ball valve is installed in the upstream side of spiral case import as the prime valve of High Head Pumped Storage Power Station unit, has the characteristics tight, that hydraulic loss is little, water leakage is little of closing.Ball valve has important effect in water-storage power plant, after unit and governing system break down, can be in moving water the emergency cut-off ball valve, block current, prevent that unit from flying the ease time and surpassing permissible value, avoid accident to enlarge; Its safe and reliable work is not only determining the economy and the security of Power Plant operation, and is determining the safety of whole water-storage unit underground power house.
The inlet valve of the Ming Tombs, Beijing accumulation of energy power plant is a ball valve.Ball valve is installed between conduit pipe and the spiral case inlet extension, and the ball valve upstream extremity is welded on the upper reaches diversion Steel Tube Special, and the ball valve downstream is connected on the import extension of spiral case through the extension, downstream, and the entire arrangement of ball valve is shown in Fig. 1 a
In the maintenance process of reality, find to throw and move back chamber 9 pressure reduction and arrive rated value, cause maintenance upstream seal ring 2 and maintenance downstream sealing ring 3 not throwing, retreating put 8 demonstrations of maintenance sealing available position sensor in place; In the ball valve maintenance, find to cause the gap between valve body 1 inside and outside lining and the spool 4 to reduce, cause the action resistance of slip ring 5 to increase because there are a large amount of incrustation scales in ball valve maintenance sealing throwing, retreating chamber 9; Thereby cause ball valve maintenance sealing throwing, retreating position not in place, cause ball valve maintenance sealing throwing to move back chamber 9 pressure reduction and reduce (shown in Fig. 1 b, Fig. 1 c), cause the maintenance sealing reliably not throw and move back; Be not closed completely; Maintenance sealing water leakage is quite big, causes the spiral case manhole door not open, and can't get between turn(a)round and carry out service work in spiral case, the draft tube; The normal maintenance of hydraulic turbine specialty and the safe operation of unit have been influenced; Even causing the wearing and tearing of unit ball valve maintenance sealed packing, ball valve maintenance shortening sealing life is changed ball valve maintenance sealing.
The ball valve maintenance drops into when being sealed in unit maintenance, when unit stand-by state, operating states of the units, is withdrawing from the position, and annual throwing of maintenance sealing moved back once, and action frequency is less, under these circumstances, is easier to move back chamber 9 in throwing and produces incrustation scale, the shell growth.Overlap online cleaning device through making one, during the unit maintenance in every year, on-line cleaning is carried out in the maintenance sealing, reach the incrustation scale removing is carried out in ball valve maintenance sealing throwing, retreating chamber; Can improve the service life of ball valve seal ring, prolong the cycle of ball valve maintenance sealing maintenance, avoid the influence of penstock emptying water channel; Improve the standby time of unit; Reduce the water leakage under the compressor emergency shutdown state effectively, improved the security and stability of unit operation, improved the economical operation ability of unit.
Summary of the invention
The purpose of this invention is to provide a kind of on-line cleaning device and method of ball valve maintenance sealing, comprising:
A kind of on-line cleaning device of ball valve maintenance sealing is characterized in that, adopts portable cleaning device; Whole 304 stainless steels that adopt of this cleaning device are made; Casing 10 middle parts are provided with the movable filter screen 11 of pull, and box cover is a movable flip, make things convenient for the scene to use and keep in repair box equipment; Electric control box 15 places casing 10 fronts, and water pump 12 places casing 10 front end bottoms, and the water pump base is equipped with beam, and is fastening with stainless steel bolt, and electric control box 15 adopts rubber seal to prevent that cleaning fluid is excessive with casing 10 junctions; The bottom of casing 10 is electrically heated rod 16 fixedly, and electrically heated rod 16 connects temperature controller 14 on electric control box 15 and electric control box 15 side walls; Electric control box 15 is equipped with earth leakage protective device and emergency stop push button, and handrail 13 is equipped with in the casing outside, and 4 rubber wheels 18 are installed below the bottom, is convenient to move in the place in and transport; Casing 10 rear end faces bottom is installed front end blow-down pipe 19, rear end blow-down pipe 20 and return pipe 21 side by side.
A kind of on-line cleaning method of ball valve maintenance sealing is characterized in that, comprises the steps:
1) at first adopts portable cleaning device; And portable cleaning device is installed in the cleaning device scene; The outlet pipe that is about to the water pump 12 of portable cleaning device is connected on the ball valve maintenance sealing feed water valve 24, and the return pipe 21 of portable cleaning device is connected on the ball valve maintenance sealed drain valve 23;
2) selection and the matting process of the cleaning agent of maintenance sealing; When selecting cleaning agent, must select based on the material that will clean, technological requirement and Environmental Safety; Because the material of ball valve maintenance sealing is that stainless steel and Casting aluminium bronze are formed; Therefore select for use acidic cleaner as main cleaning agent; The effect of acidic cleaner is incrustation scale and the metal oxide that stainless steel surfaces is removed in pickling; Dissolve incrustation scale and peel off incrustation scale; Its dissolving incrustation scale, iron oxide, rust deposite ability are strong; Reaction speed is fast, and reaction back waste water is prone to handle; Matting is for withdrawing from ball valve maintenance sealing earlier, and the running water that the maintenance sealing feed pipe 6 from valve body 1 feeds after running water washes, washes is discharged from maintenance sealing drainpipe 7; The back is that the acidic cleaner solution of 4-5wt% adds ball valve from ball valve maintenance sealing feed water valve 24 with concentration; Temperature is controlled between 30-40 ℃ and cleans; After nitric acid cleaned, the flushing outlet of inspection maintenance sealed drain valve 23 finished pickling when incrustation scale, impurity no longer occurring; Select the acid high-efficient corrosion inhibitor of Lan-826 then for use, concentration is controlled in the 1-3wt%, circulation 10-20 minute; Play the effect of protection ball valve maintenance sealing, select tertiary sodium phosphate passivator for use, concentration is controlled at 0.5-1.5wt%; Surface passivation 2-4 hour, last running water was rinsed well;
3) cleaning performance inspection
Using flushing with clean water is qualified up to the transparent no residue of the water quality of delivery port; Clean back inspection maintenance sealing ring and throw and whether smooth and easyly move back, the bite situation do not occur for normal, the force value in inspection throwing, retreating chamber when the maintenance sealing drops into and withdraws from, the force value that drops into the chamber is 5.0Mpa, the force value that withdraws from the chamber is that 0.00MPa is qualified.
Said acidic cleaner is a kind of among hydrochloric acid, nitric acid, hydrofluoric acid, sulfamic acid, citric acid and the EDTA (ethylenediamine tetra-acetic acid).
The invention has the beneficial effects as follows through the on-line cleaning device, during the unit maintenance in every year, on-line cleaning is carried out in ball valve maintenance sealing.The present invention mainly is made up of stainless steel and Casting aluminium bronze according to the material of ball valve maintenance sealing; Therefore select for use acidic cleaner as main cleaning agent; The effect of nitric acid is incrustation scale and the metal oxide that stainless steel surfaces is removed in pickling; The reduction of dissolved incrustation scale with peel off incrustation scale, its dissolving incrustation scale, iron oxide, the rust deposite ability is strong, reaction speed is fast, reaction back waste water is prone to handle.Reach the incrustation scale cleaning is carried out in ball valve maintenance sealing throwing, retreating chamber; Can improve the service life of ball valve seal ring, prolong the cycle of ball valve maintenance, avoid the influence of penstock emptying water channel; Improve the standby time of unit; Reduce the water leakage under the compressor emergency shutdown state effectively, improved the security and stability of unit operation, improved the economical operation ability of unit.Solving power plant's ball valve maintenance sealing needs the problem of cleaning, the service life that prolongs ball valve maintenance sealing, prolongs the time between overhauls(TBO) of ball valve maintenance sealing.
Description of drawings
Fig. 1 (a, b, c) is a ball valve installation site sketch map.
Fig. 2 is a ball valve cleaning device sketch map.
Fig. 3 is the on-line cleaning sketch map of ball valve maintenance sealing.
Fig. 4 is ball valve maintenance sealing cleaning device circuit diagram.
The specific embodiment
The present invention provides a kind of on-line cleaning device and method of ball valve maintenance sealing.Explain below in conjunction with accompanying drawing and embodiment.
Be illustrated in figure 2 as the on-line cleaning device sketch map of ball valve maintenance sealing.Adopt portable cleaning device, whole 304 stainless steels that adopt of this cleaning device are made, and casing 10 middle parts are provided with the movable filter screen 11 of pull; Box cover is a movable flip; Make things convenient for the scene to use and keep in repair box equipment, rubber seal is adopted in loam cake and casing junction, prevents that cleaning fluid 22 is excessive; Electric control box 15 places casing 10 fronts, and water pump 12 places casing 10 front end bottoms, and the water pump base is equipped with beam, and is fastening with stainless steel bolt, and electric control box 15 adopts rubber seal to prevent that cleaning fluid 22 is excessive with casing 10 junctions; The bottom of casing 10 is electrically heated rod 16 fixedly, and electrically heated rod 16 connects temperature controller 14 and liquid level position demonstration 17 on electric control box 15 and electric control box 15 side walls; Temperature controller is provided with the temperature automatic control switch, and temperature display is arranged; Power switches are installed in the electric control box 15, earth leakage protective device and emergency stop push button (as shown in Figure 4) are housed, handrail 13 is equipped with in the casing outside, handrail as water pipe coiling support and cable hank around support.4 rubber wheels 18 are installed below the bottom, are convenient to move in the place and transportation; Casing 10 rear end faces bottom is installed front end blow-down pipe 19, rear end blow-down pipe 20 and return pipe 21 side by side.
Install at the scene that is illustrated in figure 3 as portable cleaning device, and water pump 12 outlet pipes of portable cleaning device are connected on the ball valve maintenance sealing feed water valve 24, and the return pipe 21 of portable cleaning device is connected on the ball valve maintenance sealed drain valve 23;
3) selection of cleaning agent and matting process must be selected according to material, technological requirement and the Environmental Safety that will clean when selecting cleaning agent, select for use acidic cleaner as main cleaning agent; The cleaning agent of selecting is a kind of among hydrochloric acid, nitric acid, hydrofluoric acid, sulfamic acid, citric acid and the EDTA (ethylenediamine tetra-acetic acid).Material based on ball valve maintenance sealing is that stainless steel and Casting aluminium bronze are formed; Therefore select for use nitric acid as main cleaning agent; The effect of nitric acid is incrustation scale and the metal oxide that stainless steel surfaces is removed in pickling; Dissolve incrustation scale and peel off incrustation scale; Its dissolving incrustation scale, iron oxide, rust deposite ability are strong; Reaction speed is fast, and reaction back waste water is prone to handle.
The matting process; Earlier ball valve maintenance sealing is withdrawed from, the maintenance sealing feed pipe 6 usefulness running water from valve body 1 wash, discharge (shown in Fig. 1 b, Fig. 1 c) from maintenance sealing drainpipe 7, and the salpeter solution of concentration as 4.5wt% used in the back; Clean; Temperature is controlled at 35 ℃, and after nitric acid cleaned, inspection flushing outlet finished pickling when incrustation scale, impurity no longer occurring; Select the acid high-efficient corrosion inhibitor of Lan-826 then for use; Concentration is controlled at 2.5wt%, circulates 15 minutes, plays the effect of protection ball valve maintenance sealing; Select tertiary sodium phosphate passivator for use; Concentration is controlled at 1wt%, and the effect of protection maintenance sealing metal face and the fouling time of prolongation incrustation scale are played in passivation 3 hours;
4) cleaning performance inspection
Using flushing with clean water is qualified up to the transparent no residue of the water quality of delivery port; Clean back inspection maintenance sealing ring and throw and whether smooth and easyly move back, the bite situation do not occur for normal, the force value in inspection throwing, retreating chamber when the maintenance sealing drops into and withdraws from, the force value that drops into the chamber is 5.0Mpa, the force value that withdraws from the chamber is that 0.00MPa is qualified.
Claims (5)
1. a ball valve overhauls the on-line cleaning device of sealing; It is characterized in that; The on-line cleaning device of said ball valve maintenance sealing is portable cleaning device; The casing of this device (10) middle part is provided with the movable filter screen of pull (11), and box cover is a movable flip, makes things convenient for the scene to use and keep in repair box equipment; Electric control box (15) places casing (10) front, and water pump (12) places casing (10) front end bottom, and the water pump base is equipped with beam, and is fastening with stainless steel bolt, and electric control box (15) adopts rubber seal to prevent that cleaning fluid is excessive with casing (10) junction; The bottom of casing (10) is electrically heated rod (16) fixedly, and electrically heated rod (16) connects temperature controller (14) on electric control box (15) and electric control box (15) side walls; Electric control box (15) is equipped with earth leakage protective device and emergency stop push button, and handrail (13) is equipped with in the casing outside, and (4) individual rubber wheel (18) is installed below the bottom, is convenient to move in the place in and transport; Casing (10) rear end face bottom is installed front end blow-down pipe (19), rear end blow-down pipe (20) and return pipe (21) side by side.
2. according to the on-line cleaning device of the said ball valve maintenance of claim 1 sealing, it is characterized in that whole 304 stainless steels that adopt of this cleaning device are made.
3. the said ball valve of claim 1 overhauls the on-line cleaning method that seals, and it is characterized in that step is following:
1) at first adopt portable cleaning device, and install at the scene, the outlet pipe of water pump (12) is connected on the ball valve maintenance sealing water supply valve (24), the return pipe of cleaning device (21) is connected on the ball valve maintenance sealed drain valve (23);
2) selection and the matting process of the cleaning agent of maintenance sealing; When selecting cleaning agent, must select based on the material that will clean, technological requirement and Environmental Safety; Because the material of ball valve maintenance sealing is made up of stainless steel and Casting aluminium bronze; Therefore select for use acidic cleaner as main cleaning agent; The effect of acidic cleaner is incrustation scale and the metal oxide that stainless steel surfaces is removed in pickling; Dissolve incrustation scale and peel off incrustation scale; Its dissolving incrustation scale, iron oxide, rust deposite ability are strong; Reaction speed is fast, and reaction back waste water is prone to handle; Matting is for withdrawing from ball valve maintenance sealing earlier, and the running water that the maintenance sealing feed pipe (6) from valve body (1) feeds after running water washes, washes is discharged from maintenance sealing drainpipe (7); The back is that the acidic cleaner solution of 4-5wt% adds ball valve from ball valve maintenance sealing feed water valve (24) with concentration; Temperature is controlled between 30-40 ℃ and cleans; After pickling, the flushing of inspection maintenance sealed drain valve (23) outlet finishes pickling when incrustation scale, impurity no longer occurring; Select the acid high-efficient corrosion inhibitor of Lan-826 then for use, concentration is controlled in the 1-3wt%, circulation 10-20 minute; Play the effect of protection ball valve maintenance sealing, select tertiary sodium phosphate passivator for use, concentration is controlled at 0.5-1.5wt%; Surface passivation 2-4 hour, last running water was rinsed well;
3) cleaning performance inspection
Using flushing with clean water is qualified up to the transparent no residue of the water quality of delivery port; Clean back inspection maintenance sealing ring and throw and whether smooth and easyly move back, the bite situation do not occur for normal, the force value in inspection throwing, retreating chamber when the maintenance sealing drops into and withdraws from, the force value that drops into the chamber is 5.0Mpa, the force value that withdraws from the chamber is that 0.00MPa is qualified.
4. according to the on-line cleaning method of the said ball valve of claim 3 maintenance sealing, it is characterized in that said acidic cleaner is a kind of among hydrochloric acid, nitric acid, hydrofluoric acid, sulfamic acid, citric acid and the EDTA.
5. the on-line cleaning method that said ball valve maintenance seals according to claim 3; It is characterized in that; It is to use the salpeter solution of concentration as 4.5wt% that said acidic cleaner adopts the concrete acid cleaning process of nitric acid, cleans, and temperature is controlled at 35 ℃; After nitric acid cleaned, inspection flushing outlet finished pickling when incrustation scale, impurity no longer occurring; Select the acid high-efficient corrosion inhibitor of Lan-826 then for use; Concentration is controlled at 2.5wt%, circulates 15 minutes, plays the effect of protection ball valve maintenance sealing; Select tertiary sodium phosphate passivator for use; Concentration is controlled at 1wt%, and the effect of protection maintenance sealing metal face and the fouling time of prolongation incrustation scale are played in passivation 3 hours.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110297778.XA CN102416387B (en) | 2011-09-27 | 2011-09-27 | On-line cleaning device and method for ball valve overhauling seal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110297778.XA CN102416387B (en) | 2011-09-27 | 2011-09-27 | On-line cleaning device and method for ball valve overhauling seal |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102416387A true CN102416387A (en) | 2012-04-18 |
| CN102416387B CN102416387B (en) | 2014-07-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201110297778.XA Active CN102416387B (en) | 2011-09-27 | 2011-09-27 | On-line cleaning device and method for ball valve overhauling seal |
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| Country | Link |
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| CN (1) | CN102416387B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110016677A (en) * | 2019-04-25 | 2019-07-16 | 郑州长鑫科工贸有限公司 | A kind of high-efficient corrosion inhibition type agent prescription and its manufacturing method |
| CN113235100A (en) * | 2021-03-11 | 2021-08-10 | 中国科学院近代物理研究所 | Surface treatment method before oxygen-free copper brazing |
| CN114713555A (en) * | 2022-04-15 | 2022-07-08 | 空天合一(北京)空间科技有限公司 | Method for cleaning long-life high-reliability universal valve for spacecraft |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110016677A (en) * | 2019-04-25 | 2019-07-16 | 郑州长鑫科工贸有限公司 | A kind of high-efficient corrosion inhibition type agent prescription and its manufacturing method |
| CN113235100A (en) * | 2021-03-11 | 2021-08-10 | 中国科学院近代物理研究所 | Surface treatment method before oxygen-free copper brazing |
| CN114713555A (en) * | 2022-04-15 | 2022-07-08 | 空天合一(北京)空间科技有限公司 | Method for cleaning long-life high-reliability universal valve for spacecraft |
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| Publication number | Publication date |
|---|---|
| CN102416387B (en) | 2014-07-23 |
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