CN116556468A - Control method suitable for water supply system pressure relief device with back pressure technology - Google Patents
Control method suitable for water supply system pressure relief device with back pressure technology Download PDFInfo
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- CN116556468A CN116556468A CN202310536514.8A CN202310536514A CN116556468A CN 116556468 A CN116556468 A CN 116556468A CN 202310536514 A CN202310536514 A CN 202310536514A CN 116556468 A CN116556468 A CN 116556468A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 61
- 238000000034 method Methods 0.000 title claims abstract description 41
- 238000005516 engineering process Methods 0.000 title claims abstract description 9
- 230000001105 regulatory effect Effects 0.000 claims abstract description 50
- 230000009471 action Effects 0.000 claims abstract description 11
- 230000008569 process Effects 0.000 claims description 23
- 230000001276 controlling effect Effects 0.000 claims description 8
- 238000012423 maintenance Methods 0.000 claims description 5
- 238000011065 in-situ storage Methods 0.000 claims description 3
- 238000005259 measurement Methods 0.000 claims description 3
- 230000009467 reduction Effects 0.000 description 7
- 230000008859 change Effects 0.000 description 6
- 230000010355 oscillation Effects 0.000 description 6
- 230000005611 electricity Effects 0.000 description 4
- 230000007704 transition Effects 0.000 description 3
- 238000013016 damping Methods 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
Classifications
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- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03B—INSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER
- E03B1/00—Methods or layout of installations for water supply
- E03B1/02—Methods or layout of installations for water supply for public or like main supply for industrial use
-
- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03B—INSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER
- E03B7/00—Water main or service pipe systems
- E03B7/02—Public or like main pipe systems
-
- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03B—INSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER
- E03B7/00—Water main or service pipe systems
- E03B7/07—Arrangement of devices, e.g. filters, flow controls, measuring devices, siphons, valves, in the pipe systems
- E03B7/071—Arrangement of safety devices in domestic pipe systems, e.g. devices for automatic shut-off
-
- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03B—INSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER
- E03B7/00—Water main or service pipe systems
- E03B7/07—Arrangement of devices, e.g. filters, flow controls, measuring devices, siphons, valves, in the pipe systems
- E03B7/075—Arrangement of devices for control of pressure or flow rate
-
- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03B—INSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER
- E03B7/00—Water main or service pipe systems
- E03B7/07—Arrangement of devices, e.g. filters, flow controls, measuring devices, siphons, valves, in the pipe systems
- E03B7/078—Combined units with different devices; Arrangement of different devices with respect to each other
-
- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03B—INSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER
- E03B7/00—Water main or service pipe systems
- E03B7/09—Component parts or accessories
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
Landscapes
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Hydrology & Water Resources (AREA)
- Public Health (AREA)
- Water Supply & Treatment (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Control Of Fluid Pressure (AREA)
Abstract
The invention relates to a control method suitable for a pressure relief device of a water supply system with a back pressure technology, which is characterized in that a first pressure switch is defined to set a pressure value as P1, a second pressure switch is defined to set a pressure value as P2, when the switching value provided by the first pressure switch and the analog value provided by a pressure transmitter reach the action pressure P1+ (P2-P1) multiplied by 95%, an electric flow control valve is kept for 30 seconds, and if the pressure of the pressure transmitter is still higher than the action value, a control cabinet controls the electric flow control valve to execute a valve opening program; when the pressure of the pressure transmitter is reduced to P1+ (P2-P1) multiplied by 20 percent during valve opening, the control cabinet controls the electric flow regulating valve to stop opening; when the electric flow regulating valve is fully opened and the system pressure still cannot reach below P1+ (P2-P1) multiplied by 95%, the electric flow regulating valve is kept fully opened. The invention improves the stability and reliability of the technical water supply system of the hydropower station unit, and avoids the accident shutdown caused by the damage of the air cooler, the three bearing oil coolers, the water chilling unit, the main transformer and the air conditioner due to the overhigh pressure of each technical water supply system of the hydropower station.
Description
Technical Field
The invention belongs to the technical field of operation and maintenance of hydroelectric generating sets, and relates to a control method suitable for a water supply system pressure relief device with a back pressure technology.
Background
A technical water supply system of a hydropower station adopts self-flow water supply, and volute water is supplied to cooling equipment such as three bearing oil coolers, air coolers and the like through a water filter, a two-stage pressure reducing valve and a four-way reversing valve. The four-way reversing valve changes direction, the pressure reducing valve fails, and the like, so that the system pressure is increased, the stable operation of the technical water supply system and the hydroelectric generating set is endangered, the pressure reducing valve is required to accurately and stably act at the moment, part of high-pressure water is discharged, the pressure of the water supply system is reduced, and the stable operation of the water supply system is ensured. After the secondary pressure reducing valve of the hydropower station is provided with the mechanical hydraulic pressure relief valve, partial water of the system can be discharged to tail water through the action of the mechanical hydraulic pressure relief valve, the pressure of the system is reduced, and the tail water level is higher than that of the pressure relief valve, so that the pressure after the pressure relief valve changes along with the tail water level.
The analysis results in the above-mentioned situation because the mechanical hydraulic relief valve uses the hydraulic pilot valve to drain or replenish water from the main valve control chamber, thereby controlling the relief valve opening and closing. The control mode has two major disadvantages:
firstly, back pressure is easy to change after the valve, so that the pressure relief valve is controlled to be opened and closed inaccurately, and even when the back pressure is large, the valve is difficult to open.
And secondly, the opening degree cannot be timely adjusted according to the pressure before the valve is opened, so that the opening degree of the pressure relief valve and the current pressure are in an optimal state, and the system pressure is prevented from being too low or too high due to too large or too small opening degree.
Disclosure of Invention
In order to solve the problem that the background art provided, this patent aims at designing a control method suitable for take backpressure technique water supply system pressure relief device, solves relief valve uninstallation pressure inaccuracy, is not applicable to the operating mode that tail water level changed, the difficult problem of relief valve action.
In order to achieve the above object, the present invention provides the following technical solutions: the utility model provides a be applicable to take backpressure technique water supply system pressure relief device, is including connecting the delivery pipe between spiral case inlet and draft tube, install electric flow control valve on the delivery pipe, electric flow control valve is connected with the switch board electricity, electric flow control valve with install pressure transmitter on the pipeline between the spiral case inlet, pressure transmitter with install first pressure switch and second pressure switch on the pipeline between the spiral case inlet, first pressure switch, second pressure switch and pressure transmitter all with the switch board electricity is connected.
Preferably, the first pressure switch is used for controlling the electric flow valve to be opened, and the second pressure switch is used for controlling the electric flow valve to be closed.
Preferably, the pressure transmitter is used for comparing with the first pressure switch and the second pressure switch, so that the error of measurement of the first pressure switch or the second pressure switch is avoided, and the misoperation of the electric flow regulating valve is avoided.
The invention also provides a control method suitable for the pressure relief device of the water supply system with the back pressure technology, which defines the set pressure value of the first pressure switch as P1 and the set pressure value of the second pressure switch as P2:
when the switching value provided by the first pressure switch and the analog value provided by the pressure transmitter reach the action pressure P1+ (P2-P1) multiplied by 95%, the electric flow regulating valve is kept for 30 seconds, and if the pressure of the pressure transmitter is still higher than the action value at the moment, the control cabinet controls the electric flow regulating valve to execute a valve opening program;
in the valve opening process, when the pressure of the pressure transmitter is reduced to P1+ (P2-P1) multiplied by 20%, the control cabinet controls the electric flow regulating valve to stop opening;
when the electric flow regulating valve is fully opened and the system pressure still cannot reach below P1+ (P2-P1) multiplied by 95%, the electric flow regulating valve is kept in a fully opened state.
Preferably, when the pressure of the second pressure switch and the pressure transmitter is lower than P1+ (P2-P1) multiplied by 5%, the electric flow regulating valve is kept for 1 minute, and if the pressure is still lower than P1+ (P2-P1) multiplied by 5%, the control cabinet controls the electric flow regulating valve to be closed;
in the valve closing process, when the pressure of the pressure transmitter exceeds P1+ (P2-P1) multiplied by 5 percent again, the electric flow regulating valve stops closing and keeps in-situ; when the pressure of the second pressure switch and the pressure transmitter is reduced to P1+ (P2-P1) multiplied by 5 percent, the valve closing procedure is continuously executed, and the valve closing process is repeated until the electric flow regulating valve is fully closed.
Preferably, in the valve closing process, when the electric flow regulating valve is in a stop state for more than 10 minutes, the control cabinet exits the valve closing process and sends out an alarm signal so as to remind maintenance personnel to adjust the technical water supply system.
The beneficial effects of the invention are as follows:
1. according to the invention, the opening degree of the electric flow regulating valve can be regulated in real time according to the system pressure, and the closing rate of the flow regulating valve can be regulated to adapt to different system pressures.
2. According to the invention, the system pressure is not affected by back pressure, the electric pressure relief mode is accurate in action, strong in adaptability and high in automation degree, when the system pressure is abnormal, operation and maintenance personnel can timely find out the system pressure, and the system pressure is regulated through the pressure relief valve, so that the system reliability is higher.
3. The device and the control method improve the stability and reliability of the technical water supply system of the hydropower station unit, the main transformer technical water supply system and the air conditioner technical water supply system, avoid the accident shutdown caused by the damage of the air cooler, the three bearing oil coolers, the water chilling unit, the main transformer and the air conditioner due to the overhigh pressure of the technical water supply system of the hydropower station, and have important significance for the stable operation of the unit, the main transformer and the air conditioner system.
Drawings
Fig. 1 is a schematic structural view of the present invention.
In the figure: 1. a volute water intake; 2. a draft tube; 3. a water supply pipe; 4. an electric flow rate regulating valve; 5. a control cabinet; 6. a pressure transmitter; 7. a first pressure switch; 8. and a second pressure switch.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The inventor selects normal and fault working conditions of the pressure reducing valve as control working conditions for analyzing the closing transitional process of the pressure reducing valve.
Under normal working conditions, the pressure in the pipeline is smaller, so that the maximum value of the water pressure rise caused by different closing rules of the pressure relief valve is not obvious, and the maximum value of the water pressure rise is reduced along with the increase of the closing time, and the maximum value is only about 2% -3% of the rated working pressure. The maximum water hammer pressure caused by hydraulic oscillation in the opening process of the pressure reducing valve is about 7% -8% of the rated working pressure, the damping time of the oscillation is 2-3 s, and only when the closing time of the pressure reducing valve is short (for example, 2 s), the hydraulic oscillation processes of the pressure reducing valve and the pressure reducing valve are overlapped to influence the maximum water hammer pressure, but the influence is relatively small. From the viewpoint of the change of the total flow, as the pressure reducing valve is opened to normally work, the total flow is firstly reduced, the maximum reduction amount is about 50% of the rated flow, then the time for recovering the rated flow is related to the closing time of the pressure reducing valve, and the faster the pressure reducing valve is closed, the smaller the reduction amount of the total flow is, and the shorter the time for recovering the rated flow is.
Under the fault working condition, the initial water pressure in the pipeline is very high, so that the change of the main pipe pressure and the flow in the hydraulic transition process is obviously different from that in the normal working condition, the maximum water hammer pressure is influenced by the opening of the pressure reducing valve and the closing of the pressure reducing valve, and the pressure reducing valve plays a leading role. Under the fault working condition, the maximum water pressure rise gradually becomes smaller along with the increase of the closing time of the pressure relief valve, and the maximum water pressure rise reaches about 40% of the rated working pressure. The hydraulic oscillation during the opening process of the pressure reducing valve is a main reason for reducing the water hammer pressure, and the damping time of the oscillation is obviously slower than that of the normal working condition. Therefore, under different closing times of the pressure release valve, the hydraulic oscillation processes of the pressure release valve and the pressure release valve are overlapped, so that the maximum water hammer pressure is influenced. From the viewpoint of the total flow change, the total flow change is more stable, the minimum reduction is only about 25% of the rated flow (2 s closing rule) and is about 25% smaller than the flow reduction value under the normal working condition, and the total flow change is also related to the closing time of the pressure release valve.
In order to obtain the optimal valve closing rule, the inventor of the application analyzes the water pressure and flow changes of different working conditions and different valve closing hydraulic transition processes. The maximum water pressure rising value and the maximum flow rate reducing value caused by closing the pressure relief valve at a specific time always repel each other under normal working conditions or fault working conditions, that is, the larger the maximum water pressure rising value is, the smaller the corresponding maximum flow rate reducing value is.
For the fault working condition, the variation rule of the maximum pressure rise and the maximum flow reduction in the hydraulic transition process is that the maximum water pressure rise is reduced along with the valve closing time, and the maximum flow reduction is increased along with the valve closing time.
Under normal conditions, as the valve closing time increases, the maximum water pressure rise and the maximum flow decrease also show opposite variation trends, which are similar to the rules of fault conditions. Therefore, there is an optimum valve closing law such that both the maximum water pressure rise and the maximum flow rate reduction are relatively small.
Example 1
Based on the above-mentioned research results, this embodiment provides a be applicable to take backpressure technique water supply system pressure relief device, including connecting the delivery pipe 3 between spiral case intake 1 and draft tube 2, install electric flow control valve 4 on the delivery pipe 3, electric flow control valve 4 is connected with switch board 5 electricity, electric flow control valve 4 with install pressure transmitter 6 on the pipeline between spiral case intake 1, pressure transmitter 6 with install first pressure switch 7 and second pressure switch 8 on the pipeline between spiral case intake 1, first pressure switch 7, second pressure switch 8 and pressure transmitter 6 all with switch board 5 electricity is connected.
In the description of the present invention, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present invention.
In the above embodiment, the first pressure switch 7 is used for controlling the electric flow valve 4 to be opened, and the second pressure switch 8 is used for controlling the electric flow valve 4 to be closed; the pressure transmitter 6 is used for comparing with the first pressure switch 7 and the second pressure switch 8, so that the error measurement of the first pressure switch 7 or the second pressure switch 8 is avoided, and the misoperation of the electric flow regulating valve 4 is avoided; the control cabinet 5 is used for receiving data transmitted by the first pressure switch 7, the second pressure switch 8 and the pressure transmitter 4, and judging and controlling to open or close the electric flow regulating valve 4.
Example 2
A control method suitable for a water supply system pressure relief device with back pressure technology defines that the set pressure value of a first pressure switch 7 is P1, and the set pressure value of a second pressure switch 8 is P2:
when the switching value provided by the first pressure switch 7 and the analog value provided by the pressure transmitter 6 reach the action pressure P1+ (P2-P1) multiplied by 95%, the electric flow regulating valve 4 is kept for 30 seconds, if the pressure of the pressure transmitter 6 is still higher than the action value at the moment, the control cabinet 5 controls the electric flow regulating valve 4 to execute a valve opening program, and two signals are not necessary;
in the valve opening process, when the pressure of the pressure transmitter 6 is reduced to P1+ (P2-P1) multiplied by 20%, the control cabinet 5 controls the electric flow regulating valve 4 to stop opening;
when the electric flow rate regulating valve 4 is fully opened and the system pressure still cannot reach below p1+ (P2-P1) ×95%, the electric flow rate regulating valve 4 remains fully opened.
Further, in the valve closing procedure, when the pressure of the second pressure switch 8 and the pressure transmitter 6 is as low as p1+ (p2—p1) ×5%, the electric flow rate regulating valve 4 is kept for 1 minute, and if the pressure is still lower than p1+ (p2—p1) ×5%, the control cabinet 5 controls the electric flow rate regulating valve 4 to be closed;
in the valve closing process, when the pressure of the pressure transmitter 6 exceeds P1+ (P2-P1) multiplied by 5 percent again, the electric flow regulating valve 4 stops closing and keeps in-situ; when the pressure of the second pressure switch 8 and the pressure transmitter 6 is reduced to P1+ (P2-P1) x 5%, the valve closing procedure is continuously executed, and the valve closing process is repeated until the electric flow regulating valve 4 is fully closed.
Further, in the valve closing process, when the electric flow regulating valve 4 is in a stop state for more than 10 minutes, the control cabinet 5 exits the valve closing process and sends out an alarm signal to remind maintenance personnel to adjust the technical water supply system.
The closing rate of the electric flow rate regulating valve 4 is calculated according to a feature compatibility equation calculated by a water hammer, when the electric flow rate regulating valve 4 is fully opened, the pressure of the pressure transmitter 6 is pc=p1+ (P2-P1) ×5%, the closing time t of the electric flow rate regulating valve 4 is given to enable the maximum pressure Pmax to be approximately P2 at the pressure transmitter 6, and in this state, the closing rate v=2pi/t of the electric flow rate regulating valve 4 is selected to control the opening and closing of the electric flow rate regulating valve 4 by selecting a proper electric actuator according to V.
Finally, it is noted that the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications and equivalents may be made thereto without departing from the spirit and scope of the technical solution of the present invention, which is intended to be covered by the scope of the claims of the present invention.
Claims (3)
1. The control method suitable for the pressure relief device of the water supply system with the back pressure technology comprises a water supply pipe connected between a water intake of a volute and a draft tube, wherein an electric flow regulating valve is arranged on the water supply pipe and is electrically connected with a control cabinet, a pressure transmitter is arranged on a pipeline between the electric flow regulating valve and the water intake of the volute and is used for being compared with a first pressure switch and a second pressure switch, so that the error measurement of the first pressure switch or the second pressure switch is avoided, and the misoperation of the electric flow regulating valve is caused; a first pressure switch and a second pressure switch are arranged on a pipeline between the pressure transmitter and the volute water intake, the first pressure switch is used for controlling the opening of the electric flow valve, the second pressure switch is used for controlling the closing of the electric flow valve, and the first pressure switch, the second pressure switch and the pressure transmitter are electrically connected with the control cabinet; defining the set pressure value of the first pressure switch as P1 and the set pressure value of the second pressure switch as P2, and is characterized in that:
when the switching value provided by the first pressure switch and the analog value provided by the pressure transmitter reach the action pressure P1+ (P2-P1) multiplied by 95%, the electric flow regulating valve is kept for 30 seconds, and if the pressure of the pressure transmitter is still higher than the action value at the moment, the control cabinet controls the electric flow regulating valve to execute a valve opening program;
in the valve opening process, when the pressure of the pressure transmitter is reduced to P1+ (P2-P1) multiplied by 20%, the control cabinet controls the electric flow regulating valve to stop opening;
when the electric flow regulating valve is fully opened and the system pressure still cannot reach below P1+ (P2-P1) multiplied by 95%, the electric flow regulating valve is kept in a fully opened state.
2. The control method for a water supply system pressure relief device with backpressure technology according to claim 1, wherein:
when the pressure of the second pressure switch and the pressure transmitter is lower than P1+ (P2-P1) multiplied by 5%, the electric flow regulating valve is kept for 1 minute, and if the pressure is still lower than P1+ (P2-P1) multiplied by 5%, the control cabinet controls the electric flow regulating valve to be closed;
in the valve closing process, when the pressure of the pressure transmitter exceeds P1+ (P2-P1) multiplied by 5 percent again, the electric flow regulating valve stops closing and keeps in-situ; when the pressure of the second pressure switch and the pressure transmitter is reduced to P1+ (P2-P1) multiplied by 5 percent, the valve closing procedure is continuously executed, and the valve closing process is repeated until the electric flow regulating valve is fully closed.
3. The control method for a water supply system pressure relief device with backpressure technology according to claim 2, wherein: in the valve closing process, when the electric flow regulating valve is in a stop state for more than 10 minutes, the control cabinet exits the valve closing process and sends out an alarm signal so as to remind maintenance personnel to adjust the technical water supply system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310536514.8A CN116556468A (en) | 2022-09-01 | 2022-09-01 | Control method suitable for water supply system pressure relief device with back pressure technology |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211063902.0A CN115341515B (en) | 2022-09-01 | 2022-09-01 | Pressure relief device suitable for water supply system with back pressure technology and control method |
| CN202310536514.8A CN116556468A (en) | 2022-09-01 | 2022-09-01 | Control method suitable for water supply system pressure relief device with back pressure technology |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202211063902.0A Division CN115341515B (en) | 2022-09-01 | 2022-09-01 | Pressure relief device suitable for water supply system with back pressure technology and control method |
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| CN116556468A true CN116556468A (en) | 2023-08-08 |
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| CN202310536514.8A Pending CN116556468A (en) | 2022-09-01 | 2022-09-01 | Control method suitable for water supply system pressure relief device with back pressure technology |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102518094A (en) * | 2012-01-06 | 2012-06-27 | 黄河勘测规划设计有限公司 | Hydroelectric generating set technical water supply system of hydroelectric station for sediment-laden river |
| MX346417B (en) * | 2012-02-10 | 2017-03-06 | Geo Estratos S A De C V | Equipment and method for opening and closing an automatic valve installed in the discharge line of an oil well. |
| CN204342433U (en) * | 2014-12-18 | 2015-05-20 | 江苏康尔臭氧有限公司 | A kind of ozonizer control device of water treatment |
| CN110441049B (en) * | 2019-07-04 | 2023-08-11 | 中国核电工程有限公司 | Nuclear power station self-operated temperature regulating valve real-flow calibration test bench |
| CN111441896A (en) * | 2020-05-09 | 2020-07-24 | 贵州省水利投资(集团)有限责任公司 | System and method for eliminating pressure rise in hydraulic transition process of hydropower station |
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| CN115341515A (en) | 2022-11-15 |
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