Valve cavity drainage device and method

Abstract

The application discloses a valve cavity drainage device and method, and relates to the technical field of nuclear power. The device comprises a water pump, a pipeline assembly, a power unit and a control unit. The pipeline assembly comprises a first pipeline and a second pipeline, which are arranged in parallel along a vertical direction and are connected through a bend at the upper end to form a siphon channel between the first pipeline and the second pipeline. The lower end of the first pipeline is a water inlet, and the lower end of the second pipeline is a water outlet connected with the water inlet of the water pump. The power unit is electrically connected with the water pump. The control unit is electrically connected with the water pump and the power unit respectively and is used for controlling the start-stop and rotating speed of the water pump. The device can realize the discharge of nuclear sewage or other highly contaminated liquid, solve the problem of cleaning residual water in the valve cavity and reduce the radiation dose of the operator.

Description

Technical Field

[0001] This application relates to the field of nuclear power technology, and in particular to a valve cavity drainage device and method. Background Technology

[0002] The pumping of water from valves in nuclear power plants is primarily done manually, which involves wasting manpower and raising concerns about radiation dose. Furthermore, the operation is extremely cumbersome when wearing coveralls or disposable paper protective suits. If there is a significant amount of residual water in the valve cavity and auxiliary pipes, the working time is very long, with some valves requiring drainage for more than a day, resulting in a substantial increase in radiation dose. Many operators are unwilling to clean the residual water from the valve cavity. Moreover, no suitable high-dose valve cavity drainage devices have been found domestically or internationally.

[0003] Therefore, how to solve the problem of cleaning residual water in the valve cavity is an urgent issue that needs to be addressed. Summary of the Invention

[0004] In view of this, this application provides a valve cavity drainage device and method, the main purpose of which is to solve the problem of cleaning residual water in the valve cavity and reduce the radiation dose to operators. Conventional drainage methods are outdated and have drawbacks, wasting manpower, and once water is spilled due to improper operation, it is very difficult to clean up, and there is a risk of increasing the radiation dose to personnel.

[0005] To achieve the above objectives, this application provides the following technical solution: A valve chamber drainage device, comprising: Water pump; A piping assembly, comprising a first pipe and a second pipe, wherein the first pipe and the second pipe are arranged parallel to each other in a vertical direction and are connected smoothly at their upper ends by a bend to form a siphon channel between the first pipe and the second pipe; wherein the lower end of the first pipe is a water inlet and the lower end of the second pipe is a water outlet, and the water outlet is connected to the water inlet of the water pump; The power unit is electrically connected to the water pump; The control unit is electrically connected to both the water pump and the power unit, and is used to control the start-up, shutdown, and speed of the water pump.

[0006] Furthermore, it also includes a fixing component, which is fixedly connected to the pipeline assembly for fixing the valve chamber drainage device to the valve or flange.

[0007] Furthermore, it also includes a water shortage detection unit, which is located at the water inlet of the water pump and electrically connected to the control unit; after receiving a stop signal sent by the water shortage detection unit, the control unit controls the water pump to stop running.

[0008] Furthermore, it also includes a leak protection box and a leak monitoring unit. The leak monitoring unit is installed inside the leak protection box and is electrically connected to the control unit. After receiving a leak signal from the leak monitoring unit, the control unit controls the water pump to stop running.

[0009] Furthermore, it also includes a leak-proof component, which includes: A splash guard, movably connected to the leak-proof protection box, is used to prevent liquid from splashing into the external environment; At least two guide vanes are provided at the inlet and outlet connections of the water pump to guide leaked liquid into the leak-proof protection box.

[0010] Furthermore, the control unit includes a potentiometer, which is electrically connected to the water pump.

[0011] This application also provides a valve cavity drainage method for operating any of the valve cavity drainage devices described in this application, characterized by comprising the following steps: S1: The valve chamber drainage device is fixed to the valve or flange of the valve chamber to be drained by the fixing assembly; S2: Insert the lower end of the first pipeline into the liquid accumulation area inside the valve cavity; S3: Start the water pump through the control unit, and use the potentiometer to control the speed of the water pump to control the drainage flow rate; S4: The water pump operates, purging the air from the pipeline assembly. Liquid in the valve chamber flows into the water pump inlet through the siphon channel and is then discharged by the water pump.

[0012] Furthermore, it also includes a water shortage protection step: when the water shortage detection unit detects that there is no water flow at the water pump inlet for a period of time exceeding a preset threshold, the control unit controls the water pump to automatically stop running.

[0013] Furthermore, it also includes a leakage protection step: when the leakage monitoring unit installed in the leakage protection box detects a leakage signal, the control unit controls the water pump to automatically stop running and confine the leaking liquid inside the leakage protection box.

[0014] Furthermore, the leakage protection step also includes: using the splash guard to prevent liquid from splashing into the external environment, and using the flow guide to guide the leaking liquid from the inlet and outlet connections of the water pump into the leakage protection box.

[0015] Therefore, the valve cavity drainage device according to this application can be directly adsorbed or clamped onto the valve. By setting the automatic drainage power and time, it can automatically drain residual water from high-dose valves and equipment in nuclear power plants, effectively reducing personnel radiation exposure. The valve cavity drainage device of this application is equipped with a protection unit, allowing it to run idle for extended periods without human supervision. This makes it very convenient for solving drainage problems and can also be widely applied to the discharge of other highly polluting and low-corrosive liquids, especially suitable for conditions where liquid leakage is strictly prohibited.

[0016] Therefore, it avoids the disadvantages described at the beginning and gains the corresponding advantages. Attached Figure Description

[0017] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings: Figure 1 A schematic diagram of a valve chamber drainage device provided in an embodiment of this application is shown.

[0018] 1-Outlet pipe, 2-Inlet pipe, 3-Fixed component, 4-First pipeline, 5-Second pipeline, 6-Timer, 7-Control switch, 8-Potential speed controller, 9-Indicator sign, 10-Electrical box panel, 11-Self-weighted water baffle, 12-Power unit, 13-Control unit, 14-Electrical box, 15-Water pump box, 16-Water pump, 17-Water shortage monitoring sensor, 18-Water pump box panel, 19-Leakage monitoring sensor, 20-Connector, 21-Leakage protection device, 22-Leakage plug. Detailed Implementation

[0019] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0020] It should be noted that, unless otherwise specified, the experimental methods described in the following embodiments are all conventional methods, and the reagents and materials described are all commercially available unless otherwise specified. In the description of this application, the terms "lateral", "longitudinal", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0021] like Figure 1 As shown, this application provides a valve chamber drainage device, comprising: Water pump 16; The piping assembly includes a first pipe 4 and a second pipe 5, which are arranged parallel to each other in a vertical direction and are connected smoothly at their upper ends by a bend to form a siphon channel between the first pipe 4 and the second pipe 5; wherein, the lower end of the first pipe 4 is the water inlet and the lower end of the second pipe 5 is the water outlet, and the water outlet is connected to the water inlet of the water pump 16. The power unit 12 is electrically connected to the water pump 16; The control unit 13 is electrically connected to the water pump 16 and the power unit 12 respectively, and is used to control the start, stop and speed of the water pump 16.

[0022] Specifically, the valve cavity drainage device provided in this application comprises a water pump 16, a pipeline assembly, a power unit 12, and a control unit 13. The water pump 16 is a self-priming DC 12V diaphragm pump or vane pump, with quick-connect fittings at both its inlet and outlet for easy detachable connection to the pipeline. The pipeline assembly includes a first pipeline 4 and a second pipeline 5. The first pipeline 4 is a PU front suction pipe made of transparent polyurethane, which is flexible and bendable, facilitating insertion into various dead corners of the valve cavity. The second pipeline 5 is a 304 stainless steel suction pipe, providing a stable support frame. The upper ends of the first pipeline 4 and the second pipeline 5 are smoothly connected by a curved section of pipe, with the inner diameter of the curved pipe matching that of the first pipeline 4 and the second pipeline 5, thus forming an inverted U-shaped siphon channel between the first pipeline 4 and the second pipeline 5. The lower end of the first pipeline 4 serves as the inlet, extending downwards naturally to allow immersion in the accumulated liquid in the valve cavity. The second pipeline 5 is connected to the inlet of the water pump 16 via a straight-insertion connector 20. The power unit 12 is a DC 12V power supply box with an integrated lithium battery pack or an external DC power interface. Its output is electrically connected to the water pump 16 via a waterproof cable, providing continuous power to the water pump. The control unit 13 is located in a separate electrical box 14. The front of the box has an electrical box panel 10, which centrally houses the control switch 7, timer 6, point-to-point speed controller 8, and indicator 9. The core of the control unit 13 is a PLC control board. Its input interfaces are connected to the panel switch, timer, and speed controller, respectively. Its output interface is electrically connected to the power supply circuits of both the water pump 16 and the power unit 12. The power supply to the water pump 16 is controlled by a relay, and the water pump speed is adjusted using PWM wide modulation. The indicator 9 clearly indicates the function of each operation button. The point-to-point speed controller 8 is a rotary knob that allows for stepless setting of the drainage flow rate. When the entire device is working, the water pump 16 first expels the air from the pipeline, creating a negative pressure in the siphon channel. The liquid in the valve chamber rises along the first pipeline 4, passes through the top bend, enters the water pump 16 through the second pipeline 5, and finally exits from the drain port of the water pump 16. The water pump 16 operates in the pneumatic stage, used to expel the air from the pipeline and establish the initial negative pressure required for siphoning. After the siphon channel is established, the liquid in the valve chamber continuously flows into the water pump 16 under the drive of atmospheric pressure and gravity difference. The water pump 16 maintains flow compensation, thereby avoiding the power consumption and wear of the self-priming pump running idle for a long time. The two work together to realize the working mode of pump start-up and siphon maintenance.

[0023] This application utilizes a siphon channel in conjunction with a self-priming pump to easily extract residual liquid from the valve chamber of nuclear power plant contaminated valves, overcoming the limitation of ordinary drainage pumps that cannot empty low-level residual liquids. The device has a compact layout and can smoothly transport even small amounts of gas, significantly improving drainage efficiency and the range of operating conditions. The control unit integrates start / stop, speed regulation, and timing functions onto a single panel, making operation intuitive and simple. PLC logic control enables semi-automatic or fully automatic operation, reducing the frequency of manual intervention. Simultaneously, the power unit supports lithium battery power, allowing the device to be used flexibly without an external power source.

[0024] Furthermore, it also includes a fixing component 3, which is fixedly connected to the pipeline assembly and is used to fix the valve chamber drainage device to the valve or flange.

[0025] Specifically, fixing component 3 is used for the mechanical connection between the valve cavity drainage device and the valve or flange of the nuclear power plant contamination valve. Fixing component 3 consists of a universal magnetic base, a bow-shaped clamp, and a pressure plate. The universal magnetic base attracts the valve cavity drainage device onto the valve cavity pipeline, and the bow-shaped clamp engages with the pressure plate via locking bolts. Stainless steel pipe clamps are welded to the ball head support of the universal magnetic base, and the pipe clamps connect to the pipeline assembly, thereby fixing the valve cavity drainage device to the valve pipeline. At the same time, the bow-shaped clamp and pressure plate can clamp the valve cavity drainage device onto the valve or flange, which is lightweight and flexible. With the help of the universal magnetic base or bow-shaped clamp mechanism, the valve cavity drainage device can be quickly and reliably fixed to the valve or flange. The clamping force of the bow-shaped clamp and the pressure plate is sufficient to resist the vibration of the water pump during operation, prevent the pipeline from falling off or shifting, and the installation and disassembly are lightweight and flexible, significantly improving the efficiency and safety of on-site operation.

[0026] Furthermore, it also includes a water shortage detection unit 17, which is located at the water inlet of the water pump 16 and is electrically connected to the control unit 13; after receiving a stop signal sent by the water shortage detection unit 17, the control unit 13 controls the water pump 16 to stop running.

[0027] Specifically, the valve chamber drainage device also includes a water shortage detection unit 17, which is a water shortage shutdown sensor used to monitor the water flow at the inlet of the water pump 16. The water shortage shutdown sensor uses an electrode-type liquid level detection probe. The signal cable of the water shortage detection unit 17 is led out through a waterproof connector and connected to the PLC analog input port of the control unit 13 in the electrical box 14. The control unit 13 has a delay judgment logic. When a continuous no-water-flow signal is detected for more than a preset 15-second threshold, it is determined to be in a water shortage state. The PLC immediately controls the output relay to disconnect, cutting off the power supply circuit of the water pump 16, causing the water pump 16 to stop automatically. At the same time, the warning light on the electrical box panel 10 illuminates, prompting the operator to check the liquid level in the valve chamber or the pipe blockage. The water shortage shutdown sensor has a compact structure, can withstand the impact of the gas-water mixture, and can complete the no-water detection without interfering with the water flow. By installing the water shortage detection unit 17 on the side wall of the water pump 16, the water inlet status of the water pump 16 is monitored in real time. When water accumulates in the valve chamber and is drained, or when pipeline blockage causes the pump to run dry, the system can automatically shut down in a very short time. This prevents the pump from running dry for extended periods, which could lead to motor overheating and damage, significantly extending the equipment's lifespan. The water shortage protection eliminates the need for manual supervision, enabling the device to operate safely at remote sites. This effectively reduces maintenance costs and the rate of unexpected failures, improving the equipment's reliability and intelligence under complex operating conditions.

[0028] Furthermore, it also includes a leak protection box 21 and a leak monitoring unit 19. The leak monitoring unit 19 is located inside the leak protection box 21 and is electrically connected to the control unit 13. After receiving a leak signal from the leak monitoring unit 19, the control unit 13 controls the water pump 16 to stop running.

[0029] Specifically, the leak-proof protection box 21 is a sealed container made of corrosion-resistant or stainless steel sheet, with sufficient internal space to accommodate the water pump 16, inlet pipe connector, and outlet pipe connector. The leak detection unit 19 is fixed to the side wall of the leak-proof protection box 21. The leak detection unit 19 is a leak detection sensor, typically a liquid level sensor. When a leak occurs at the water pump 16 or pipe connector, liquid flows into the box and accumulates. When the liquid level rises to a preset warning height, a leak signal is triggered. The output cable of the leak detection sensor is led out from the side wall and connected to the PLC digital input port of the control unit 13. Once the control unit 13 receives the short-circuit or low-resistance signal, it immediately and unconditionally executes the protection action, cutting off the power to the water pump 16 via a relay, forcing the water pump 16 to stop. The leak detection unit 19 is installed on the side wall of the leak-proof protection box 21, ensuring that the sensor only triggers an alarm when the leaked liquid accumulates to a certain amount, effectively avoiding false alarms caused by small amounts of liquid splashing and improving the accuracy and reliability of the protection logic. The leak-proof protection box 21 and the leak monitoring unit 19 constitute an active leak-proof safety system. When the pump unit or accessories experience significant leakage due to aging or damage, the wastewater is completely confined within the protection box, and the leakage situation is monitored by the leak monitoring sensor 19. This structural design ensures inherent safety of the device when extracting harmful or radioactive media, greatly reducing potential hazards to operators and the environment, and meeting the stringent requirements of the nuclear industry.

[0030] Furthermore, it also includes leak-proof components, which include: The splash guard 11 is movably connected to the leak-proof protection box 21 to prevent liquid from splashing into the external environment; At least two guide vanes 22 are provided at the inlet and outlet connections of the water pump 16 to guide the leaked liquid into the leak-proof protection box 21.

[0031] Specifically, the splash guard 11 is a self-weight water baffle, movably connected to the upper edge of the opening of the leak-proof protection box 21 via a hinge shaft, naturally blocking the main operation and observation ports of the box by its own weight. The self-weight water baffle effectively blocks water droplets splashed out by the impeller agitation or airflow during the operation of the water pump 16, without affecting the pressure balance inside and outside the box. The guide member 22 is a leak-proof plug, preferably two guide members 22, installed at the inlet and outlet connections of the water pump 16. Once liquid leakage occurs at the connection, the liquid will be guided into the leak-proof protection box 21 through the guide member 22. The guide member 22 can be quickly installed on the quick-connect fitting 20 of the water pipe, and can be disassembled without tools, without affecting the quick connection and replacement of the pipeline. The splash guard 11 passively blocks splashes by gravity, has a simple structure, requires no maintenance, and can prevent nuclear power plant wastewater from polluting the external environment without shutting down the system. The guide component 22 eliminates the potential for minor leakage accumulation at the inlet and outlet of the water pump 16, and improves the sealing performance of the device.

[0032] Furthermore, the control unit 13 includes a potentiometer 8, which is electrically connected to the water pump 16.

[0033] Specifically, the potentiometer 8 is mounted on the electrical box panel 10, with its output terminal connected to the analog input terminal of the PLC, or directly electrically connected to the PWM speed control module of the water pump 16. The potentiometer 8 is preferably a rotary variable resistor, with the rotation angle corresponding to 0~100% of the output voltage or PWM duty cycle. Inside the electrical box 14, the PLC of the control unit 13 reads the voltage division value of the potentiometer 8 to achieve stepless speed regulation of the water pump 16. The potentiometer 8 avoids the energy waste and liquid splashing caused by traditional fixed-speed pumps when there is a small flow rate requirement. Combined with the timing function, it can precisely control the total drainage volume.

[0034] This application also provides a valve cavity drainage method for operating any of the valve cavity drainage devices, characterized by comprising the following steps: S1: Fix the valve cavity drainage device to the valve or flange of the valve cavity to be drained by fixing component 3; S2: Insert the lower end of the first pipe 4 into the liquid accumulation area inside the valve cavity; S3: Start water pump 16 through control unit 13, and use the speed of water pump 8 to control the drainage flow rate; S4: Pump 16 operates, purging the air from the pipeline assembly. Liquid in the valve chamber flows into the inlet of pump 16 through the siphon channel and is discharged by pump 16.

[0035] Specifically, the operator uses the fixing component 3 to fix the valve cavity drainage device to the valve cavity pipeline, with the lower end of the first pipeline 4 extending as far into the lowest point of the valve cavity as possible to ensure that residual water is covered. Pressing the control switch 7 on the electrical box 10 panel powers on the control unit 13 and starts the water pump 16. The appropriate drainage flow rate is set via the rotary potentiometer 8, and the running time is set via the fluctuation timer 6. As the water pump 16 runs, it first removes air from the pipeline assembly, establishing negative pressure in the siphon channel. Under atmospheric pressure, the liquid in the valve cavity rises along the first pipeline 4, flows through the top bend into the second pipeline 5, enters the water pump 16, and is discharged from the outlet pipe 1 to the designated collection point. This method simplifies the complex valve pumping operation process and significantly shortens on-site preparation time. Utilizing the device's own siphon characteristics and speed-regulating timing function, it achieves efficient and quantitative drainage of residual liquid from nuclear power plant valves.

[0036] Furthermore, it also includes a water shortage protection step: when the water shortage detection unit detects that there is no water flow at the water pump inlet for a period of time exceeding a preset threshold, the control unit controls the water pump to automatically stop running.

[0037] Specifically, during or after drainage, the water shortage detection unit 17, installed on the side of the water pump 16, continuously monitors the liquid at the inlet. If the water in the valve chamber is emptied, the control unit 13 executes a protection program, controls the relay to disconnect, immediately cuts off the power to the water pump 16, and the water pump stops operating. At the same time, the water shortage indicator light on the panel of the electrical box 14 illuminates. The water shortage protection steps greatly improve operational safety.

[0038] Furthermore, a leakage protection step is included: when the leakage monitoring unit 19 installed in the leakage protection box 21 detects a leakage signal, the control unit 13 controls the water pump 16 to automatically stop running and confine the leaked liquid inside the leakage protection box 21.

[0039] Specifically, during the drainage process, if the mechanical seal of the water pump 16 or the inlet / outlet pipe joints leak, the leaked liquid will fall into the leak-proof protection box 21 due to gravity or splashing. The leakage monitoring unit 19 sends a leakage signal to the control unit 13, which then controls the water pump 16 to shut down. Through the dual action of shutdown and physical sealing, the harm of a leakage accident is minimized, eliminating the possibility of harmful liquid spillage causing environmental pollution or personal injury. The above design allows the valve chamber drainage device to be used for discharging nuclear wastewater, improving the safety and reliability of drainage operations. The valve chamber drainage device has protective functions, ensuring reliable operation of the equipment under harsh conditions and saving operating costs. It requires no manual intervention, is inexpensive, and ensures that contaminated water will not leak into the environment.

[0040] Furthermore, the leakage protection steps also include: using the splash guard 11 to prevent liquid from splashing into the external environment, and using the guide 22 to guide the leaking liquid from the inlet and outlet connections of the water pump 16 into the leak protection box 21.

[0041] Specifically, before or during drainage operations, the splash guard 11 on the leak-proof protection box 21 always hangs down under its own weight, blocking the opening area where liquid may splash. When slow leakage occurs, the guide 22 installed at the inlet and outlet connections of the water pump 16 guides the liquid into the leak-proof protection box 21, preventing residual liquid from falling to the outside after the water pump 16 stops. These steps enable the device to not only shut down in an emergency when a leak occurs, but also to completely seal the leakage path, eliminating the risk of nuclear wastewater leakage.

[0042] Those skilled in the art will understand that the steps, measures, and solutions in the various operations, methods, and processes discussed in this application can be alternated, modified, combined, or deleted. Furthermore, other steps, measures, and solutions in the various operations, methods, and processes discussed in this application can also be alternated, modified, rearranged, decomposed, combined, or deleted. Furthermore, steps, measures, and solutions in the prior art that are similar to those disclosed in this application can also be alternated, modified, rearranged, decomposed, combined, or deleted.

[0043] The above description is only a partial embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A valve chamber drainage device, characterized in that, include: Water pump (16); The pipeline assembly includes a first pipeline (4) and a second pipeline (5), which are arranged parallel to each other in the vertical direction and are connected smoothly at their upper ends by a bend to form a siphon channel between the first pipeline (4) and the second pipeline (5); wherein the lower end of the first pipeline (4) is the inlet and the lower end of the second pipeline (5) is the outlet, and the outlet is connected to the inlet of the water pump (16); The power unit (12) is electrically connected to the water pump (16); The control unit (13) is electrically connected to the water pump (16) and the power unit (12) respectively, and is used to control the start-up, shutdown and speed of the water pump (16).

2. The valve chamber drainage device according to claim 1, characterized in that, It also includes a fixing component (3), which is fixedly connected to the pipeline assembly and is used to fix the valve cavity drainage device to the valve or flange.

3. The valve chamber drainage device according to claim 1, characterized in that, It also includes a water shortage detection unit (17), which is located at the inlet of the water pump (16) and electrically connected to the control unit (13); the control unit (13) controls the water pump (16) to stop running after receiving a stop signal sent by the water shortage detection unit (17).

4. The valve chamber drainage device according to claim 1, characterized in that, It also includes a leak protection box (21) and a leak monitoring unit (19). The leak monitoring unit (19) is located inside the leak protection box (21) and is electrically connected to the control unit (13). After receiving a leak signal from the leak monitoring unit (19), the control unit (13) controls the water pump (16) to stop running.

5. The valve chamber drainage device according to claim 4, characterized in that, It also includes a leak-proof component, which comprises: A splash guard (21) is movably connected to the leak-proof protection box (21) to prevent liquid from splashing into the external environment; At least two guides (22) are provided at the inlet and outlet connections of the water pump (16) to guide the leaked liquid into the leak-proof protection box (21).

6. The valve chamber drainage device according to claim 1, characterized in that, The control unit (13) includes a potentiometer (8) which is electrically connected to the water pump (16).

7. A valve cavity drainage method for operating a valve cavity drainage device as described in any one of claims 1 to 6, characterized in that, Includes the following steps: S1: The valve cavity drainage device is fixed to the valve or flange of the valve cavity to be drained by the fixing component (3); S2: Insert the lower end of the first pipeline (4) into the liquid accumulation area inside the valve cavity; S3: Start the water pump (16) through the control unit (13) and use the potentiometer (8) to control the speed of the water pump to control the drainage flow rate; S4: The water pump (16) operates, venting the air in the pipeline assembly. The liquid in the valve chamber flows into the inlet of the water pump (16) through the siphon channel and is discharged by the water pump (16).

8. The valve cavity drainage method according to claim 7, characterized in that, It also includes a water shortage protection step: when the water shortage detection unit detects that there is no water flow at the water pump inlet for a period of time exceeding a preset threshold, the control unit controls the water pump to automatically stop running.

9. The valve cavity drainage method according to claim 7, characterized in that, It also includes a water leakage protection step: when the water leakage monitoring unit (19) installed in the water leakage protection box (21) detects a water leakage signal, the control unit (13) controls the water pump (16) to automatically stop running and confine the leaked liquid inside the water leakage protection box (21).

10. The valve cavity drainage method according to claim 9, characterized in that, The leakage protection steps also include: using the splash guard (21) to prevent liquid from splashing into the external environment, and using the guide (22) to guide the leaked liquid from the inlet connection and outlet connection of the water pump (16) into the leak protection box (21).

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