CN212537509U - Gate valve middle cavity overvoltage protection device capable of achieving outward leakage - Google Patents
Gate valve middle cavity overvoltage protection device capable of achieving outward leakage Download PDFInfo
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- CN212537509U CN212537509U CN202021092374.8U CN202021092374U CN212537509U CN 212537509 U CN212537509 U CN 212537509U CN 202021092374 U CN202021092374 U CN 202021092374U CN 212537509 U CN212537509 U CN 212537509U
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Abstract
The utility model discloses an overpressure protection device for a middle cavity of an externally-released gate valve, which comprises an inlet side main pipeline communicated with the inlet side of a double-gate plate gate valve, wherein the side part of the inlet side main pipeline is communicated with a drain pipeline before the valve, and a drain valve is arranged on the drain pipeline before the valve; an overpressure protection system is communicated between a front drain pipeline of the drain valve and a middle cavity of the double-gate valve, and the overpressure protection system is interactively connected with a DCS controller which is used for receiving detection signals of the overpressure protection system and controlling the operation of the overpressure protection system. The utility model discloses a drain line has guaranteed effectively that the double-gate board gate valve is difficult for impairedly before the valve that the bottom intercommunication of inlet side trunk line set up, sets up the overvoltage protection system through between the hydrophobic pipeline before the lumen of double-gate board gate valve and valve, can realize the control to double-gate board gate valve lumen pressure, has realized the automatic purpose of releasing of double-gate board gate valve lumen superpressure to guaranteed that the double-gate board should have the effect of double containment.
Description
Technical Field
The utility model relates to a double-gate board gate valve overvoltage protection technical field, more specifically relate to a gate valve lumen overvoltage protector that leaks.
Background
The double-gate valve has the advantages of simple structure, reliable sealing performance, good sealing performance, small opening and closing moment, long service life and the like, and is widely applied to pipeline systems of electric power, petroleum, natural gas, chemical industry and the like. Due to the good sealing structure on both sides, the abnormal increase of the cavity pressure in the gate valve can be generated in some cases. Generally, a fluid medium of a system is changed from a cold state to a hot state after starting up, a gate valve of a main pipeline is closed in the cold state, and the main gate valve can be opened only after a main pipeline is heated and a warm pipe reaches a certain temperature and pressure condition; when fluid (liquid or gas) accumulates in the valve middle chamber, if the inlet side fluid temperature increases, the temperature of the middle chamber fluid will increase due to the principle of heat transfer. Because the expansion coefficients of metal and fluid are different, the volume of the cavity in the valve is far from the expansion speed of the fluid when the volume is thermally expanded, when the fluid stored in the cavity is changed from a cold state to a hot state, the fluid can be rapidly expanded, some liquid can be gasified, the pressure is rapidly increased, and the increased pressure is often in a geometric series. The consequences of over-pressurization of the valve are severe. When the pressure of the middle cavity of the valve is abnormally increased, the working stress of a pressure-bearing part and a starting and closing part (such as a valve rod, a flashboard supporting frame and a packing sleeve) of the valve is sharply increased, a valve plate is wedged on a valve seat under the action of expansion fluid, the driving force of a driving mechanism can bear heavy load and even cannot be started, and the phenomena of disk root ejection, flashboard supporting frame fracture, valve rod breakage and motor burnout are not uncommon in high-pressure gate valves on a plurality of high-temperature fluid pipelines.
If no measure is taken to the system, the damage to the system caused by abnormal boosting of the middle cavity of the main gate valve can be almost unavoidable, and the damage is mainly as follows: firstly, the valve body is damaged, when the middle cavity is abnormally boosted, the opening pressure of the valve is doubled, when the actual stress of a material exceeds the allowable stress, the valve cannot be opened or the part with the over stress is cracked, and the whole valve is damaged or scrapped; secondly, damage to the production system, normal opening and closing of the valve are the key of various industrial process control, and once the on-off control cannot be smoothly realized, the system needs to be shut down for maintenance. If the weak parts such as the valve body, the valve cover, the packing filler and the like of the overpressure valve are leaked or broken, the medium is leaked; when the medium is high-temperature high-pressure toxic and harmful fluid, the consequences are more serious, even the harm to equipment and personnel is caused, and huge direct or indirect loss is caused.
The traditional middle cavity pressure relief mode has two types, which are divided into an inner pressure relief mode and an outer pressure relief mode. The internal pressure relief is that a pressure relief channel is arranged on the valve plate to communicate the middle cavity with the inlet side pipeline, and when the pressure of the middle cavity rises, the pressure can be relieved into the inlet pipeline through the pressure relief channel; the outer pressure relief is to add the pressure relief pipeline outside the valve body, set up the relief valve on the pipeline, be connected the lumen with the upper reaches outside the valve body through the pipeline for the discharge passage of lumen and inlet pipe is connected.
For the valve with the internal pressure relief hole, the middle cavity is communicated with the inlet side through the pressure relief hole, so that the sealing surface of the inlet flashboard of the double flashboards loses the sealing effect, and only the sealing surface of the outlet side plays a sealing effect, thereby losing the advantages of double sealing of the double flashboards. Some interior pressure release passageways set up slide valve or ball sealer, and sealed effectual, but the structure is complicated, and the easy jam of long-time back pressure release part loses due effect under high temperature high pressure environment in addition. The mode system of installing outer pressure release safety valve pipeline is fairly simple, nevertheless lacks system monitoring, and it is difficult to judge whether to suppress the pressure by the lumen when the valve is opened by the trouble, should not judge the reason. Therefore, the above pressure relief method has limitations, and needs to be further improved.
SUMMERY OF THE UTILITY MODEL
The utility model discloses the technical problem that needs to solve provides a gate valve lumen overvoltage protector that leaks is put to solve traditional interior pressure release mode and can lead to the sealed face of the import flashboard of double-gate board to have lost the sealing effect, and the unable problem that judges the valve and be difficult to the reason of opening of outer pressure release mode, with the purpose of realizing double-gate board gate valve lumen pressure monitoring, the automatic release of superpressure, with the effect of guaranteeing that the double-gate board should have the double containment.
In order to solve the technical problem, the utility model adopts the following technical proposal.
An overpressure protection device for a middle cavity of an externally-released gate valve comprises an inlet side main pipeline communicated with the inlet side of a double-gate valve and used for conveying high-temperature and high-pressure fluid, wherein the bottom of the inlet side main pipeline is communicated with a pre-valve drain pipeline used for fully draining water when a system is started so as to prevent the drain water from being accumulated in the inlet side main pipeline, and a drain valve used for controlling the on-off of the pre-valve drain pipeline is arranged on the pre-valve drain pipeline; the communication between the preceding drain line of valve that is located drain valve low reaches and the lumen of double-gate board gate valve is provided with and is used for detecting double-gate board gate valve lumen pressure and can discharge double-gate board gate valve lumen fluid to the preceding drain line of valve in, in order to reach double-gate board gate valve lumen pressure discharge purpose overvoltage protection system, overvoltage protection system cross connection has the DCS controller that is used for receiving overvoltage protection system detected signal and can control the operation of overvoltage protection system.
Further optimize technical scheme, the overpressure protection system includes the female pipe of the outer drainage pipeline that is linked together with the lumen of double-gate valve, and the intercommunication is provided with and is used for detecting double-gate valve lumen pressure and can be automatically with the automatic outer pressure release overpressure protection system in the double-gate valve lumen fluid drainage pipeline before the valve between the female pipe of outer drainage pipeline and the drain line before the valve.
The technical scheme is further optimized, the automatic external pressure relief overpressure protection system comprises an automatic external relief pipeline which is communicated with and arranged between an external relief pipeline main pipe and a valve front drain pipeline, a pressure sensor used for detecting the fluid pressure in a cavity of the double-gate-plate gate valve and an electromagnetic relief valve used for controlling the on-off of the automatic external relief pipeline are sequentially arranged on the automatic external relief pipeline according to the fluid conveying direction, the signal output end of the pressure sensor is connected to the input end of the DCS controller, and the controlled end of the electromagnetic relief valve is connected to the output end of the DCS controller.
Further optimize technical scheme, be provided with normally open manual stop valve respectively on the automatic outer bleeder line that is located electromagnetism bleeder valve and pressure sensor both sides.
Further optimizing technical scheme, the internal diameter of automatic outer bleeder line is not more than 10 mm.
According to the technical scheme, a manual external pressure relief overpressure protection system is further communicated and arranged between the main pipe of the external pressure relief pipeline and the front drain pipeline of the valve and used for performing manual operation under the condition that the automatic external pressure relief overpressure protection system fails so as to discharge fluid in a middle cavity of the double-gate valve into the front drain pipeline of the valve.
According to the technical scheme, the manual external pressure relief overpressure protection system comprises a manual external pressure relief pipeline and at least one normally-closed manual stop valve, wherein the manual external pressure relief pipeline is communicated with and arranged between an external pressure relief pipeline main pipe and a valve front drain pipeline, and the normally-closed manual stop valve is arranged on the manual external pressure relief pipeline.
Further optimize technical scheme, the internal diameter of manual outer bleed pipeline is not more than 10 mm.
Due to the adoption of the technical scheme, the utility model has the following technical progress.
The utility model discloses a drain pipe before the valve that the bottom intercommunication of inlet side trunk line set up sets up through set up the overvoltage protection system before the middle chamber of double-gate board gate valve and valve between the drain pipe, can realize the control to double-gate board gate valve middle chamber pressure, has realized the purpose that double-gate board gate valve middle chamber superpressure was automatic to guaranteed that the double-gate board has had the effect of double containment. Compared with the design of a conventional double-gate-plate gate valve inner cavity pressure relief pipeline and a safety valve outer pressure relief pipeline, the purposes of real-time monitoring of double-gate-plate gate valve inner cavity pressure and automatic overpressure relief can be achieved.
The utility model discloses when pressure sensor, electromagnetism bleeder valve broke down in the automatic pipeline that leaks, can close third manual stop valve, fourth manual stop valve, overhaul pressure sensor, electromagnetism bleeder valve.
The manual external pressure relief overpressure protection system can manually open the first manual stop valve and the second manual stop valve when the automatic external pressure relief overpressure protection system breaks down, so that fluid in the middle cavity of the double-gate-plate gate valve is released into a front drainage pipeline of the valve through the manual external pressure relief pipeline, and the pressure relief of the middle cavity of the double-gate-plate gate valve is realized.
Drawings
Fig. 1 is a schematic structural diagram of the present invention.
Wherein: 1. the automatic external drainage system comprises an inlet side main pipeline, 2 double-gate-plate gate valves, 3 drain valves, 4 second manual stop valves, 5 first manual stop valves, 6 external drainage pipeline leading-out points, 7 external drainage pipeline main pipes, 8 manual external drainage pipelines, 9 valve front drainage pipelines, 10 fourth manual stop valves, 11 electromagnetic drainage valves, 12 pressure sensors, 13 third manual stop valves and 14 automatic external drainage pipelines.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Example 1
An overpressure protection device for a middle cavity of an externally-leaking gate valve is shown in a combined figure 1 and comprises an inlet side main pipeline 1, a pre-valve drain pipeline 9, a drain valve 3, an overpressure protection system and a DCS (distributed control system).
The inlet side main pipeline 1 is communicated with the inlet side of the double-gate valve 2 and is used for conveying high-temperature and high-pressure fluid.
The drain pipe 9 before the valve is communicated with the bottom of the inlet side main pipe 1 and used for playing a role of fully draining water when the system is started so as to prevent the inlet side main pipe 1 from accumulating water to drain water.
The drain valve 3 is arranged on the drain pipeline 9 in front of the valve and used for controlling the on-off of the drain pipeline 9 in front of the valve.
The overpressure protection system is communicated and arranged between the middle cavity of the double-gate-plate gate valve 2 and the drain pipeline 9 before the valve positioned at the downstream of the drain valve 3, so that the pressure of the middle cavity of the double-gate-plate gate valve can be detected, and the fluid in the middle cavity of the double-gate-plate gate valve can be released into the drain pipeline 9 before the valve, so that the purpose of releasing the pressure of the middle cavity of the double-gate-plate gate valve is achieved. And the overvoltage protection system is interactively connected with the DCS controller.
The overpressure protection system comprises a main pipe 7 of the external leakage pipeline communicated with the middle cavity of the double-gate-plate gate valve 2, a through hole is drilled in the middle cavity of the double-gate-plate gate valve 2, namely an external leakage pipeline leading-out point 6, the external leakage pipeline leading-out point 6 is good in valve body strength design and convenient for pipeline welding operation, and the main pipe 7 of the external leakage pipeline is communicated with the external leakage pipeline leading-out point 6. An automatic external pressure relief overpressure protection system is communicated between the external pressure relief pipeline main pipe 7 and the front valve drain pipeline 9 and used for detecting the pressure of a middle cavity of the double-gate-plate gate valve and automatically discharging fluid in the middle cavity of the double-gate-plate gate valve into the front valve drain pipeline 9. The drain valve 3 is arranged on a drain pipe 9 in front of the valve between the inlet side main pipe 1 and the automatic pressure-releasing overpressure protection system.
The automatic external pressure relief overpressure protection system comprises an automatic external discharge pipeline 14 which is communicated and arranged between an external discharge pipeline main pipe 7 and a valve front drain pipeline 9, wherein an inlet of the automatic external discharge pipeline 14 is communicated with the external discharge pipeline main pipe 7, and an outlet of the automatic external discharge pipeline 14 is communicated with the valve front drain pipeline 9. The automatic external relief pipe 14 is provided with a pressure sensor 12 and an electromagnetic relief valve 11 in this order in the fluid conveying direction. Pressure sensor 12 sets up on automatic outer bleeder line 14, and because of automatic outer bleeder line 14 is linked together with the double disc gate valve lumen, pressure sensor 12 can detect the fluid pressure in the double disc gate valve lumen, and pressure sensor 12's signal output part is connected in the input of DCS controller. The electromagnetic release valve 11 is used for controlling the on-off of an automatic external release pipeline 14, and the controlled end of the electromagnetic release valve 11 is connected to the output end of the DCS controller.
The inner diameter of the automatic outer discharge pipe 14 is not more than 10mm, the material of the automatic outer discharge pipe 14 is selected to be consistent with the inlet side main pipe 1, and the wall thickness is selected to follow the design specification.
The automatic outer bleed conduit 14 can be opened automatically when the pressure in the middle chamber of the double gate disc gate valve exceeds a set value, and closed automatically when the pressure in the middle chamber of the double gate disc gate valve drops to a set value.
And the automatic outer discharge pipelines 14 positioned at two sides of the electromagnetic discharge valve 11 and the pressure sensor 12 are respectively provided with a normally open manual stop valve. Normally open manual stop valve is including setting up the third manual stop valve 13 and the fourth manual stop valve 10 of setting in 11 low reaches of electromagnetism bleeder valve in the pressure sensor 12 upper reaches, and third manual stop valve 13 and fourth manual stop valve 10 are in normally open state to guarantee that automatic outer discharge conduit 14's right-hand member is linked together with the double disc gate valve lumen.
The DCS controller is used for receiving detection signals of the overvoltage protection system and controlling the overvoltage protection system to operate, can realize real-time monitoring of cavity pressure in the double-gate valve, and has functions of high-pressure alarming, automatic overpressure release and automatic pressure relief closing. The output of DCS controller is connected with alarm lamp and main control display screen, and the alarm lamp can report to the police the scintillation under the control of DCS controller, and the main control display screen can show the pressure value that pressure sensor 12 detected.
The process of the embodiment in practice is as follows.
Before the inlet side main pipe 1 is put into operation, the drain pipe 9 before the valve is closed by the double-gate-plate gate valve 2, the drain valve 3 is opened, the inlet side main pipe warm pipe slowly heats up, the drain is discharged, the inlet side main pipe is prevented from suddenly flowing into high-temperature high-pressure fluid in a large amount, the temperature is rapidly raised, and thermal shock is caused to cause the fatigue damage of the pipe and the double-gate-plate gate valve. After the inlet side main pipeline warm pipe is finished (main pipeline pressure, temperature, drainage cleanliness and other parameters are qualified), the drain valve 3 is closed, the double-gate-plate gate valve 2 is opened as required, and high-temperature high-pressure fluid flows into the double-gate-plate gate valve.
In the running state, the third manual stop valve 13 and the fourth manual stop valve 10 are in the opening state, and the pressure sensor 12 monitors the cavity pressure of the double-gate valve and displays the real-time pressure P value on the main control display screen. When the pressure of the P value exceeds the design pressure K1 times of the high-temperature high-pressure fluid pipeline, the alarm lamp gives an alarm and flickers; when the pressure of the P value exceeds the design pressure K2 times of the high-temperature high-pressure fluid pipeline, the DCS controller controls the electromagnetic relief valve 11 to be opened, and the pressure of the middle cavity of the double-gate-plate gate valve is relieved.
In this embodiment, if the pressure sensor 12 and the electromagnetic relief valve 11 in the automatic external relief pipeline are out of order, the third manual stop valve 13 and the fourth manual stop valve 10 may be closed, and the pressure sensor 12 and the electromagnetic relief valve 11 may be overhauled.
Example 2
Based on embodiment 1, the difference between this embodiment and embodiment 1 is that a manual external pressure relief and overpressure protection system is further communicated between the external pressure relief pipeline main pipe 7 and the pre-valve drain pipeline 9, and the manual external pressure relief and overpressure protection system is used for performing manual operation under the condition that the automatic external pressure relief and overpressure protection system fails, so as to discharge fluid in the middle cavity of the double-gate plate gate valve into the pre-valve drain pipeline 9. The manual external pressure relief and overpressure protection system, namely the manual pressure relief and overpressure protection system, is arranged in parallel with the automatic external pressure relief and overpressure protection system.
The manual external pressure relief overpressure protection system comprises a manual external relief pipeline 8 and at least one normally-closed manual stop valve, wherein the manual external relief pipeline 8 is communicated with and arranged between an external relief pipeline main pipe 7 and a valve front drain pipeline 9, and the normally-closed manual stop valve is arranged on the manual external relief pipeline 8.
The inner diameter of the manual outer discharge pipe 8 is not more than 10mm, the material selection of the manual outer discharge pipe 8 is consistent with that of the inlet side main pipe 1, and the wall thickness selection follows the design specification.
The utility model discloses well manual stop valve of normal close is provided with two, is first manual stop valve 5 and the manual stop valve 4 of second respectively.
After the electromagnetic bleeder valve 11 is opened for N seconds, the pressure P value of the middle cavity of the double-flashboard gate valve does not drop and exceeds the design pressure K3 times of the high-temperature high-pressure fluid pipeline, the DCS controller controls the alarm lamp to alarm, the automatic external bleeder pipeline 14 is considered to be in fault, and a person on duty opens the first manual stop valve 5 and the second manual stop valve 4 on the manual external bleeder pipeline 8 to bleed the pressure of the middle cavity of the double-flashboard gate valve. When the cavity pressure in the double-gate valve drops and the P value is recovered, the first manual stop valve 5 and the second manual stop valve 4 are closed.
Claims (8)
1. The utility model provides an outer gate valve lumen overvoltage protector that leaks, includes and is linked together inlet side trunk line (1) that is used for carrying high temperature high pressure fluid with double-gate board gate valve (2) inlet side, its characterized in that: the bottom of the inlet side main pipeline (1) is communicated with a pre-valve drain pipeline (9) which is used for fully draining water when the system is started so as to prevent water from accumulating in the inlet side main pipeline (1), and a drain valve (3) which is used for controlling the on-off of the pre-valve drain pipeline (9) is arranged on the pre-valve drain pipeline (9); the front drain pipeline (9) located on the downstream of the drain valve (3) and the middle cavity of the double-gate-plate gate valve (2) are communicated with each other to be used for detecting the pressure of the middle cavity of the double-gate-plate gate valve and discharging fluid in the middle cavity of the double-gate-plate gate valve into the front drain pipeline (9) of the valve so as to achieve the purpose of pressure discharge of the middle cavity of the double-gate-plate gate valve, and the overvoltage protection system is interactively connected with a DCS controller which is used for receiving detection signals of the overvoltage protection system and controlling the operation of the overvoltage protection system.
2. The leak gate valve chamber overpressure protector of claim 1 wherein: the overpressure protection system comprises an outer leakage pipeline main pipe (7) communicated with a middle cavity of the double-gate valve (2), and an automatic outer pressure-relief overpressure protection system which is used for detecting the pressure of the middle cavity of the double-gate valve and can automatically discharge fluid in the middle cavity of the double-gate valve into a front drain pipeline (9) of the valve is arranged between the outer leakage pipeline main pipe (7) and the front drain pipeline (9).
3. The apparatus of claim 2, wherein the overpressure protection means comprises: the automatic external pressure relief and overpressure protection system comprises an automatic external relief pipeline (14) which is arranged between an external relief pipeline main pipe (7) and a valve front drain pipeline (9) in a communicating mode, a pressure sensor (12) used for detecting the fluid pressure in a cavity of the double-gate-plate gate valve and an electromagnetic relief valve (11) used for controlling the on-off of the automatic external relief pipeline (14) are sequentially arranged on the automatic external relief pipeline (14) according to the fluid conveying direction, the signal output end of the pressure sensor (12) is connected to the input end of a DCS controller, and the controlled end of the electromagnetic relief valve (11) is connected to the output end of the DCS controller.
4. The over-pressure protection device for a chamber of an externally vented gate valve of claim 3, wherein: and the automatic outer discharge pipelines (14) positioned at two sides of the electromagnetic discharge valve (11) and the pressure sensor (12) are respectively provided with a normally open manual stop valve.
5. The over-pressure protection device for a chamber of an externally vented gate valve of claim 3, wherein: the inner diameter of the automatic outer bleed conduit (14) is no greater than 10 mm.
6. The overpressure protection apparatus for the chamber of an externally vented gate valve as claimed in any one of claims 2 to 5, wherein: and a manual external pressure relief overpressure protection system which is used for performing manual operation under the condition that the automatic external pressure relief overpressure protection system fails so as to discharge fluid in a middle cavity of the double-gate valve into the front drain pipeline (9) of the valve is further communicated and arranged between the main pipe (7) of the external pressure relief pipeline and the front drain pipeline (9).
7. The apparatus of claim 6, wherein the overpressure protection means comprises: the manual external pressure relief overpressure protection system comprises a manual external relief pipeline (8) and at least one normally-closed manual stop valve, wherein the manual external relief pipeline (8) is communicated and arranged between an external relief pipeline main pipe (7) and a valve front drain pipeline (9), and the normally-closed manual stop valve is arranged on the manual external relief pipeline (8).
8. The apparatus of claim 7, wherein the overpressure protection means comprises: the inner diameter of the manual outer discharge pipe (8) is not more than 10 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021092374.8U CN212537509U (en) | 2020-06-12 | 2020-06-12 | Gate valve middle cavity overvoltage protection device capable of achieving outward leakage |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021092374.8U CN212537509U (en) | 2020-06-12 | 2020-06-12 | Gate valve middle cavity overvoltage protection device capable of achieving outward leakage |
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| Publication Number | Publication Date |
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| CN212537509U true CN212537509U (en) | 2021-02-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021092374.8U Active CN212537509U (en) | 2020-06-12 | 2020-06-12 | Gate valve middle cavity overvoltage protection device capable of achieving outward leakage |
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| Country | Link |
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| CN (1) | CN212537509U (en) |
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Address after: 050000 2nd floor, Yingpan commercial and residential building, 129 Nanxiao street, Qiaoxi District, Shijiazhuang City, Hebei Province Patentee after: Hebei Jiantou energy science and Technology Research Institute Co.,Ltd. Patentee after: HCIG GUO RONG ENERGY SERVICE Co.,Ltd. Address before: 050000 2nd floor, Yingpan commercial and residential building, 129 Nanxiao street, Qiaoxi District, Shijiazhuang City, Hebei Province Patentee before: HEBEI JI-YAN ENERGY SCIENCE AND TECHNOLOGY RESEARCH INSTITUTE Co.,Ltd. Patentee before: HCIG GUO RONG ENERGY SERVICE Co.,Ltd. |