CN112283444A - Valve maintenance method - Google Patents
Valve maintenance method Download PDFInfo
- Publication number
- CN112283444A CN112283444A CN202011342166.3A CN202011342166A CN112283444A CN 112283444 A CN112283444 A CN 112283444A CN 202011342166 A CN202011342166 A CN 202011342166A CN 112283444 A CN112283444 A CN 112283444A
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- China
- Prior art keywords
- valve
- steps
- pollution discharge
- maintenance
- grease
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000012423 maintenance Methods 0.000 title claims abstract description 39
- 238000000034 method Methods 0.000 title claims abstract description 26
- 239000004519 grease Substances 0.000 claims abstract description 44
- 238000002347 injection Methods 0.000 claims abstract description 25
- 239000007924 injection Substances 0.000 claims abstract description 25
- 238000004140 cleaning Methods 0.000 claims abstract description 24
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 12
- 238000012360 testing method Methods 0.000 claims abstract description 10
- 238000007789 sealing Methods 0.000 claims description 19
- 239000007788 liquid Substances 0.000 claims description 13
- 230000001050 lubricating effect Effects 0.000 claims description 11
- 239000010865 sewage Substances 0.000 claims description 9
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims description 3
- 238000012856 packing Methods 0.000 claims description 3
- 238000011144 upstream manufacturing Methods 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 6
- 239000012530 fluid Substances 0.000 description 5
- 238000007599 discharging Methods 0.000 description 3
- 230000002035 prolonged effect Effects 0.000 description 3
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 241000282693 Cercopithecidae Species 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K99/00—Subject matter not provided for in other groups of this subclass
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Details Of Valves (AREA)
Abstract
The invention discloses a valve maintenance method, wherein the valve is provided with a gear box, and the method comprises the following steps: s1: performing a switch test on the valve; s2: carrying out pollution discharge operation on the valve; s3: performing grease injection operation on the valve; s4: checking whether accumulated water exists in the gear box or not and cleaning the accumulated water in the gear box; s5: checking the valve and the gear box for loose parts and fastening the loose parts; s6: performing a leak check on the valve. The valve maintenance device can standardize the maintenance operation of the valve, improve the quality of valve maintenance, improve the maintenance effect, further prolong the service life of the valve and reduce the failure rate.
Description
Technical Field
The invention relates to a valve maintenance method.
Background
At present, a ball valve is needed to control the flow and the cut-off of gas in a gas conveying pipeline, and the ball valve needs to be maintained periodically after being used for a long time. However, at present, the maintenance operation of the ball valve by an operator is not standard, the sequence of the maintenance operation is unreasonable, and even part of the maintenance content is omitted, so that the valve is poor in maintenance quality, the service life of the valve is influenced, and the valve is prone to failure.
Disclosure of Invention
The technical problem to be solved by the invention is to overcome the defects of the prior art and provide a valve maintenance method, which can standardize the valve maintenance operation, improve the valve maintenance quality and improve the maintenance effect, thereby prolonging the service life of the valve and reducing the failure rate.
In order to solve the technical problems, the technical scheme of the invention is as follows: a method of maintaining a valve having a gearbox, the method comprising the steps of:
s1: performing a switch test on the valve;
s2: carrying out pollution discharge operation on the valve;
s3: performing grease injection operation on the valve;
s4: checking whether accumulated water exists in the gear box or not and cleaning the accumulated water in the gear box;
s5: checking the valve and the gear box for loose parts and fastening the loose parts;
s6: performing a leak check on the valve.
Further, the method comprises the following steps:
s0: and checking whether the valve is rusted or not and cleaning the rust and oil stains on the valve.
Further, the method comprises the following steps:
s7: checking whether the valve position indication of the valve is correct.
Further provides a specific operation step of the switch test, the valve is also provided with a pressure balance valve, in step S1, the step of performing the switch test on the valve is as follows:
opening pressure balance valves at the inlet and outlet ends of the valve until the upstream and downstream pressure difference of the valve is less than 0.1 Mpa;
injecting sealing grease into the valve to protect the valve seal;
and opening and closing the valve.
Further provided are specific operation steps of the valve opening operation and the valve closing operation,
the valve opening operation steps are as follows:
continuously rotating the hand wheel in the counterclockwise direction until the valve position indication shows 'full open', and then turning the hand wheel 1/4 circles;
the steps of the valve closing operation are as follows:
the handwheel is rotated continuously in a clockwise direction until the valve position indication indicates "full off" and then the handwheel 1/4 is turned around.
Further provided is a specific operation step of the blowdown operation, the valve further having a blowdown nozzle, and the step of performing the blowdown operation on the valve in step S2 is as follows:
actuating the valve to a fully open or fully closed position;
an operator avoids the exhaust direction of the pollution discharge nozzle and then opens the pollution discharge nozzle;
observing the discharge discharged by the pollution discharge nozzle, judging that the pollution discharge is qualified when no discharge is visible, closing the pollution discharge nozzle, and repeatedly actuating the closing member of the pollution discharge nozzle to ensure the smoothness of the pollution discharge nozzle when liquid exists in the discharge.
Further providing a specific step of the grease injection operation, in step S3, the step of performing the grease injection operation on the valve is as follows:
actuating the valve to a fully open or fully closed position;
injecting cleaning liquid to clean the grease injection passage and the sealing area, keeping for 1-2 hours, pulling the valve at an angle of 3-5 degrees, injecting the cleaning liquid again, and pulling the valve back to the original position;
after keeping for 1-2 hours, opening and closing the valve for 1-2 times, and then opening the sewage draining nozzle to discharge the cleaning liquid;
and then injecting lubricating grease into the valve by using a grease injection gun, and switching the valve for 1-2 times to uniformly coat the lubricating grease on the sealing ring.
Further, in step S6, when the valve internal leakage is detected, the following steps are performed:
adjusting the limit of the valve and changing the opening and closing position of the valve;
if the internal leakage still exists, reinforced sealing grease is injected into the valve;
if the valve still has internal leakage, the valve seat or the valve core is seriously damaged, and the valve needs to be replaced or the manufacturer needs to carry out field maintenance.
Further, in step S6, when the leakage at the valve stem is detected, the following steps are performed:
injecting sealing grease into the valve rod and the valve seat through the valve rod grease injection structure, and stopping injecting if leakage is stopped;
if there is still a leak, the valve stem packing is replaced and then the hold down bolts on top of the valve stem are tightened until the leak stops.
Further, in step S6, when it is detected that there is an external leak at the flange connection of the valve, the following steps are performed:
emptying gas in front and rear pipelines of the valve, and fastening a connecting bolt;
if the gas still leaks after fastening, the gas in the pipelines before and after the valve is emptied again, the connecting bolt is disassembled, and the flange gasket is replaced.
After the technical scheme is adopted, whether the valve is corroded or not is checked, corrosion and oil stains on the valve are cleaned, and then the valve is subjected to opening and closing test to ensure that the valve can be normally opened and closed; and then opening the sewage discharge nozzle to perform sewage discharge operation on the valve, and slowly performing grease injection operation on the valve through a manual grease injection gun after discharging the sewage in the valve. Then checking whether accumulated water exists in the gear box or not and cleaning the accumulated water in the gear box, and simultaneously checking whether bearings and gear teeth in the gear box are intact and lubricating the bearings and the gear teeth; then checking whether loose parts exist in the valve and the gear box or not and fastening the loose parts; and then, carrying out leakage check on the valve, then checking whether the valve position indication of the valve is correct, and finally, making a relevant record in time. The maintenance operation of the valve is standardized through the operation, so that the quality of valve maintenance is improved, the maintenance effect is improved, the service life of the valve is prolonged, and the failure rate is reduced; in addition, the maintenance step can improve the maintenance efficiency and save time.
Detailed Description
In order that the present invention may be more clearly understood, the following detailed description of the present invention is given with reference to specific examples.
A method of maintaining a valve having a gearbox, the method comprising the steps of:
s1: performing a switch test on the valve;
s2: carrying out pollution discharge operation on the valve;
s3: performing grease injection operation on the valve;
s4: checking whether accumulated water exists in the gear box or not and cleaning the accumulated water in the gear box, and then checking whether bearings and gear teeth in the gear box are intact and lubricating the bearings and the gear teeth;
s5: checking the valve and the gear box for loose parts and fastening the loose parts;
s6: performing a leak check on the valve. Specifically, the maintenance operation of the valve is standardized through the operation, so that the quality of valve maintenance is improved, the maintenance effect is improved, the service life of the valve is prolonged, and the failure rate is reduced; in addition, the maintenance step can improve the maintenance efficiency and save time; in this embodiment, the valve is a ball valve.
In this embodiment, the method further includes the steps of:
s0: checking whether the valve is rusted or not and cleaning the rust and oil stains on the valve;
s7: checking whether the valve position indication of the valve is correct; specifically, after the steps are completed, the relevant maintenance records should be made in time.
Specifically, the valve may further include a pressure balance valve, and in step S1, the step of performing an opening and closing test on the valve is as follows:
opening pressure balance valves at the inlet and outlet ends of the valve until the upstream and downstream pressure difference of the valve is less than 0.1 Mpa;
injecting sealing grease into the valve to protect the valve seal;
and opening and closing the valve. Wherein the content of the first and second substances,
the valve opening operation steps are as follows:
continuously rotating the hand wheel in the counterclockwise direction until the valve position indication shows 'full open', and then turning the hand wheel 1/4 circles;
the steps of the valve closing operation are as follows:
the handwheel is rotated continuously in a clockwise direction until the valve position indication indicates "full off" and then the handwheel 1/4 is turned around.
In this embodiment, the valve may further include a blowdown nozzle, and in step S2, the step of performing a blowdown operation on the valve is as follows:
actuating the valve to a fully open or fully closed position;
the operator avoids the exhaust direction of the pollution discharge nozzle and then opens the pollution discharge nozzle, so that the aim of preventing impurities in the rapid airflow from hurting the operator is fulfilled;
observing the discharge discharged by the pollution discharge nozzle, judging that the pollution discharge is qualified when no discharge is visible, closing the pollution discharge nozzle, and repeatedly actuating the closing member of the pollution discharge nozzle to ensure the smoothness of the pollution discharge nozzle when liquid exists in the discharge; specifically, if liquid exists in the discharged material, the situation that the exhaust port of the pollution discharge nozzle is blocked due to the throttling effect of the pollution discharge nozzle can be caused, so that the closing member of the pollution discharge nozzle needs to be repeatedly operated to ensure the smoothness of the pollution discharge nozzle. Further specifically, the blowdown of valve is chewed and is adopted threaded connection on the disk seat, consequently should use two spanners to operate when the blowdown to it is reliable to protect its root threaded connection, and the spanner should avoid using monkey wrench as far as possible. And the speed of opening the pollution discharge nozzle is slow, the opening degree of the pollution discharge nozzle is moderate, and the pollution discharge nozzle is suitable for discharging impurities.
Specifically, in step S3, the step of performing the grease injection operation on the valve is as follows:
actuating the valve to a fully open or fully closed position;
injecting cleaning liquid to clean the grease injection passage and the sealing area, keeping for 1-2 hours, pulling the valve at an angle of 3-5 degrees, injecting the cleaning liquid again, and pulling the valve back to the original position;
after keeping for 1-2 hours, opening and closing the valve for 1-2 times, and then opening the sewage draining nozzle to discharge the cleaning liquid;
injecting lubricating grease into the valve by using a grease injection gun, and performing switching operation on the valve for 1-2 times to uniformly coat the lubricating grease on the sealing ring; more specifically, the grease should be injected slowly using a manual grease gun, and the injection pressure should not exceed 4000psi of the line pressure. In the embodiment, firstly, cleaning fluid is injected to clean the grease injection passage and the sealing area, the valve is pulled by an angle of 5 degrees after the cleaning fluid is kept for 2 hours, the cleaning fluid is injected again, then the valve is pulled back to the original position, the valve is switched on and off for 2 times after the cleaning fluid is kept for 2 hours, and then the pollution discharge nozzle is opened to discharge the cleaning fluid; and then, injecting lubricating grease into the valve by using a grease injection gun, and performing opening and closing operation on the valve for 2 times to uniformly coat the lubricating grease on the sealing ring.
Specifically, in step S6, when the valve internal leakage is detected, the following steps are performed:
adjusting the limit of the valve and changing the opening and closing position of the valve;
if the internal leakage still exists, reinforced sealing grease is injected into the valve;
if the valve still has internal leakage, the valve seat or the valve core is seriously damaged, and the valve needs to be replaced or the manufacturer needs to carry out field maintenance; wherein, the check and the treatment of the internal leakage of the valve are carried out under the state that the valve is completely closed.
More specifically, in step S6, when the leakage at the valve stem is detected, the following steps are performed:
injecting sealing grease into the valve rod and the valve seat through the valve rod grease injection structure, and stopping injecting if leakage is stopped;
if leakage still exists, replacing the valve rod packing, and then tightening a compression bolt at the top of the valve rod until the leakage is stopped; it should be noted that the grease injection pressure cannot exceed 3000psi when injecting the sealing grease into the valve rod, otherwise the upper and lower O-rings in the sealing cavity of the valve rod may be damaged by extrusion, resulting in complete failure of the seal; the grease injection structure of the valve rod is well known in the prior art, and is not described in detail in this embodiment.
More specifically, in step S6, when it is detected that there is an external leak at the flange joint of the valve, the following steps are performed:
emptying gas in front and rear pipelines of the valve, and fastening a connecting bolt;
if the gas still leaks after fastening, the gas in the pipelines before and after the valve is emptied again, the connecting bolt is disassembled, and the flange gasket is replaced.
The working principle of the invention is as follows:
firstly, checking whether the valve is corroded and cleaning the corrosion and oil stains on the valve, and then carrying out an opening and closing test on the valve to ensure that the valve can be normally opened and closed; and then opening the sewage discharge nozzle to perform sewage discharge operation on the valve, and slowly performing grease injection operation on the valve through a manual grease injection gun after discharging the sewage in the valve. Then checking whether accumulated water exists in the gear box or not and cleaning the accumulated water in the gear box, and simultaneously checking whether bearings and gear teeth in the gear box are intact and lubricating the bearings and the gear teeth; then checking whether loose parts exist in the valve and the gear box or not and fastening the loose parts; and then, carrying out leakage check on the valve, then checking whether the valve position indication of the valve is correct, and finally, making a relevant record in time. The maintenance operation of the valve is standardized through the operation, so that the quality of valve maintenance is improved, the maintenance effect is improved, the service life of the valve is prolonged, and the failure rate is reduced; in addition, the maintenance step can improve the maintenance efficiency and save time.
The above embodiments are described in further detail to solve the technical problems, technical solutions and advantages of the present invention, and it should be understood that the above embodiments are only examples of the present invention and are not intended to limit the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A method of maintaining a valve having a gearbox, the method comprising the steps of:
s1: performing a switch test on the valve;
s2: carrying out pollution discharge operation on the valve;
s3: performing grease injection operation on the valve;
s4: checking whether accumulated water exists in the gear box or not and cleaning the accumulated water in the gear box;
s5: checking the valve and the gear box for loose parts and fastening the loose parts;
s6: performing a leak check on the valve.
2. A method of maintaining a valve according to claim 1, the method comprising the steps of:
s0: and checking whether the valve is rusted or not and cleaning the rust and oil stains on the valve.
3. A method of maintaining a valve according to claim 1, the method comprising the steps of:
s7: checking whether the valve position indication of the valve is correct.
4. The method of claim 1, wherein the valve further comprises a pressure balancing valve, and the step of performing an on/off test on the valve in step S1 comprises:
opening pressure balance valves at the inlet and outlet ends of the valve until the upstream and downstream pressure difference of the valve is less than 0.1 Mpa;
injecting sealing grease into the valve to protect the valve seal;
and opening and closing the valve.
5. The method of maintaining a valve according to claim 4,
the valve opening operation steps are as follows:
continuously rotating the hand wheel in the counterclockwise direction until the valve position indication shows 'full open', and then turning the hand wheel 1/4 circles;
the steps of the valve closing operation are as follows:
the handwheel is rotated continuously in a clockwise direction until the valve position indication indicates "full off" and then the handwheel 1/4 is turned around.
6. The method of maintaining a valve according to claim 1, wherein the valve further comprises a drain nozzle, and the step of performing a drain operation on the valve in step S2 is as follows:
actuating the valve to a fully open or fully closed position;
an operator avoids the exhaust direction of the pollution discharge nozzle and then opens the pollution discharge nozzle;
observing the discharge discharged by the pollution discharge nozzle, judging that the pollution discharge is qualified when no discharge is visible, closing the pollution discharge nozzle, and repeatedly actuating the closing member of the pollution discharge nozzle to ensure the smoothness of the pollution discharge nozzle when liquid exists in the discharge.
7. The valve maintenance method according to claim 6, wherein in step S3, the step of performing the greasing operation on the valve is as follows:
actuating the valve to a fully open or fully closed position;
injecting cleaning liquid to clean the grease injection passage and the sealing area, keeping for 1-2 hours, pulling the valve at an angle of 3-5 degrees, injecting the cleaning liquid again, and pulling the valve back to the original position;
after keeping for 1-2 hours, opening and closing the valve for 1-2 times, and then opening the sewage draining nozzle to discharge the cleaning liquid;
and then injecting lubricating grease into the valve by using a grease injection gun, and switching the valve for 1-2 times to uniformly coat the lubricating grease on the sealing ring.
8. The valve maintenance method according to claim 1, wherein in step S6, when the valve internal leakage is detected, the following steps are performed:
adjusting the limit of the valve and changing the opening and closing position of the valve;
if the internal leakage still exists, reinforced sealing grease is injected into the valve;
if the valve still has internal leakage, the valve seat or the valve core is seriously damaged, and the valve needs to be replaced or the manufacturer needs to carry out field maintenance.
9. The valve maintenance method according to claim 1, wherein in step S6, when the leakage at the valve stem is detected, the following steps are performed:
injecting sealing grease into the valve rod and the valve seat through the valve rod grease injection structure, and stopping injecting if leakage is stopped;
if there is still a leak, the valve stem packing is replaced and then the hold down bolts on top of the valve stem are tightened until the leak stops.
10. The valve maintenance method according to claim 1, wherein in step S6, when the leakage at the flange connection of the valve is detected, the following steps are performed:
emptying gas in front and rear pipelines of the valve, and fastening a connecting bolt;
if the gas still leaks after fastening, the gas in the pipelines before and after the valve is emptied again, the connecting bolt is disassembled, and the flange gasket is replaced.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011342166.3A CN112283444A (en) | 2020-11-25 | 2020-11-25 | Valve maintenance method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011342166.3A CN112283444A (en) | 2020-11-25 | 2020-11-25 | Valve maintenance method |
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| Publication Number | Publication Date |
|---|---|
| CN112283444A true CN112283444A (en) | 2021-01-29 |
Family
ID=74425804
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011342166.3A Pending CN112283444A (en) | 2020-11-25 | 2020-11-25 | Valve maintenance method |
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| Country | Link |
|---|---|
| CN (1) | CN112283444A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005048853A (en) * | 2003-07-28 | 2005-02-24 | Kitz Corp | Ball valve |
| CN101603606A (en) * | 2008-06-13 | 2009-12-16 | 张锦 | Multifunctional five-group valve |
| CN107099272A (en) * | 2017-05-22 | 2017-08-29 | 和县科嘉阀门铸造有限公司 | A kind of plug valve time-based maintenance stop-leak compound and its grease injection process |
| CN107725965A (en) * | 2017-09-14 | 2018-02-23 | 中石化川气东送天然气管道有限公司 | A kind of method from leakage point between internal closure gas trunklines pipeline branch mouth and branch pipeline root valve |
| CN111006863A (en) * | 2019-12-31 | 2020-04-14 | 中石化石油工程技术服务有限公司 | Maintenance method for natural gas long-distance pipeline valve |
-
2020
- 2020-11-25 CN CN202011342166.3A patent/CN112283444A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005048853A (en) * | 2003-07-28 | 2005-02-24 | Kitz Corp | Ball valve |
| CN101603606A (en) * | 2008-06-13 | 2009-12-16 | 张锦 | Multifunctional five-group valve |
| CN107099272A (en) * | 2017-05-22 | 2017-08-29 | 和县科嘉阀门铸造有限公司 | A kind of plug valve time-based maintenance stop-leak compound and its grease injection process |
| CN107725965A (en) * | 2017-09-14 | 2018-02-23 | 中石化川气东送天然气管道有限公司 | A kind of method from leakage point between internal closure gas trunklines pipeline branch mouth and branch pipeline root valve |
| CN111006863A (en) * | 2019-12-31 | 2020-04-14 | 中石化石油工程技术服务有限公司 | Maintenance method for natural gas long-distance pipeline valve |
Non-Patent Citations (1)
| Title |
|---|
| 西南油气田公司: "采气工安全操作读本", 31 December 2013, 中国工人出版社, pages: 48 - 49 * |
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