Check valve and piping system for a nuclear fuel reprocessing plant

Abstract

The application discloses a check valve and a pipeline system of a nuclear fuel reprocessing plant. The check valve comprises a valve body, a valve clack, an elastic rod and a control assembly. The valve body is installed in a pipeline and is internally provided with a fluid cavity. One end of the valve body is provided with an inlet, and the other end is provided with an outlet. The inlet faces the upstream of the valve body, and the outlet faces the downstream. The inlet and the outlet are both communicated with the fluid cavity. The valve clack is located in the fluid cavity of the valve body, and the upper end surface of the valve clack is attached to the inner wall of the upper end of the fluid cavity to block the inlet. One end of the elastic rod is rotationally connected with the valve body, and the other end is rotationally connected with the valve clack. The elastic rod drives the valve clack to move in the vertical direction through swinging. The control assembly is electrically connected with the elastic rod, is used for monitoring the rotation angle of the elastic rod, and judges the vertical position of the valve clack according to the rotation angle information of the elastic rod to obtain the opening degree information of the valve. The check valve has the function of remotely monitoring the opening degree of the valve.

Description

Technical Field

[0001] The present invention specifically relates to a check valve and a piping system of a nuclear fuel reprocessing plant having the check valve. Background Technology

[0002] Check valves are a type of automatic valve, mainly installed on pipelines where the medium needs to flow in one direction. They can prevent backflow of the medium, protect particularly important mechanical equipment such as pumps and compressors, and can also be used in situations where multiple branches share a main pipe to avoid material leakage accidents between branches.

[0003] The spent fuel processed at nuclear fuel reprocessing plants is highly radioactive, and the media used in each stage of the fuel processing have varying degrees of radioactivity. To prevent radiation contamination, the reprocessing plant is zoned, with the facility divided into red, orange, green, and white zones based on radiation dose and air pollution levels during operation. The red zone contains radioactive materials, experiencing high radiation doses and severe air pollution during operation. Entry by personnel is strictly prohibited during normal operation, and the design must control any contamination of other areas by this zone, employing radiation shielding to prevent media leakage. During the reprocessing process, media such as steam, deionized water, and compressed air need to be piped from the orange zone to the red zone. To prevent atmosphere leakage from the red zone into the orange zone and causing contamination, the media transportation process must ensure unidirectional flow from the orange zone to the red zone and remain sealed. Currently, the reprocessing plant uses check valves on the pipelines connecting the red and orange zones to ensure unidirectional flow of the media, preventing backflow and guaranteeing the safety of the facility.

[0004] Commonly used check valves are divided into two types: lift valves and swing valves. Both types have moving parts, such as a guide mechanism, a spring in a lift valve, and a rotor in a swing valve. These moving parts are located downstream of the sealing surface and are exposed to the downstream medium atmosphere. It is difficult for operators to monitor these moving parts in the check valve and to determine the degree of valve opening. Furthermore, if a check valve malfunctions, it is difficult for operators to detect it in a timely manner. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to address the above-mentioned deficiencies in the prior art by providing a check valve and a pipeline system for a nuclear power plant reprocessing plant. The check valve has the function of remotely monitoring the valve opening degree, which can help staff prevent accidents.

[0006] According to an embodiment of a first aspect of the present invention, a check valve is provided, comprising: a valve body, a valve disc, a resilient rod, and a control assembly. The valve body is installed in a pipeline and has a fluid cavity inside. One end of the valve body has an inlet, and the other end has an outlet. The inlet faces upstream of the valve body, and the outlet faces downstream of the valve body. Both the inlet and outlet communicate with the fluid cavity. The valve disc is located within the fluid cavity of the valve body, and its upper end face abuts against the inner wall of the upper end of the fluid cavity, used to block the inlet to prevent the medium in the pipeline from flowing back from the outlet to the inlet. One end of the resilient rod is rotatably connected to the valve body, and the other end is rotatably connected to the valve disc. The resilient rod moves the valve disc vertically by oscillation. The control assembly is electrically connected to the resilient rod and is used to monitor the rotation angle of the resilient rod and determine the vertical position of the valve disc based on the rotation angle information of the resilient rod, thereby obtaining information on the valve's opening degree.

[0007] Preferably, the elastic rod includes a connecting rod and a rotating shaft. The rotating shaft extends horizontally and passes through the valve body, and the rotating shaft is rotatable about its own axis. One end of the connecting rod is fixedly connected to the rotating shaft, and the other end is rotatably connected to the valve disc. The connecting rod can swing as the rotating shaft rotates, thereby driving the valve disc to move vertically.

[0008] Preferably, the elastic rod further includes a connecting shaft. The connecting shaft is arranged horizontally, located outside the valve body, and parallel to the rotating shaft. Both ends of the connecting shaft and the rotating shaft are connected by a torsional elastic element.

[0009] Preferably, the torsional elastic element is a clock spring.

[0010] Preferably, it also includes a control handle, which is connected to the connecting shaft and is used to drive the connecting shaft to rotate, thereby driving the rotating shaft and the connecting rod to rotate, so as to adjust the opening of the valve disc.

[0011] Preferably, the control component includes a controller and a scale, which are electrically connected. The scale is connected to the torsional elastic element and is used to monitor the rotation angle of the torsional elastic element and send the rotation angle information to the controller. The controller is used to calculate the vertical position of the valve disc based on the rotation angle information.

[0012] Preferably, the control component further includes a pressure sensor disposed within the fluid cavity of the valve body and electrically connected to the controller. The pressure sensor monitors the medium pressure within the valve body and transmits it to the controller. The controller has a pre-stored standard pressure, which, upon receiving the medium pressure information, compares the received medium pressure with the standard pressure to measure the deviation. The controller also has a preset allowable value, which is used to determine whether the medium pressure within the pipeline is abnormal based on the magnitude of the deviation value and the allowable value.

[0013] Preferably, the control component further includes a motor, the output of which is connected to the connecting shaft. The controller is also electrically connected to the motor and is used to control the motor to start when an abnormality is detected in the medium pressure within the pipeline, thereby rotating the connecting shaft to adjust the opening of the valve disc and thus regulate the medium pressure inside the pipeline until the controller determines that the medium pressure inside the pipeline is normal. The controller is also used to control the motor to stop operating when the medium pressure inside the pipeline is determined to be normal.

[0014] Preferably, a sealing ring is provided at the edge of the upper end face of the valve disc, and the sealing ring is used to seal the gap between the valve disc and the inner wall of the fluid cavity when the upper end face of the valve disc is in contact with the inner wall of the upper end of the fluid cavity.

[0015] According to an embodiment of a second aspect of the present invention, a piping system for a nuclear fuel reprocessing plant is provided, comprising a pipe and the aforementioned check valve. The pipe is used for the flow of a radioactive medium, and the check valve is installed in the pipe to prevent backflow of the radioactive medium in the pipe.

[0016] The check valve of this invention prevents backflow of the medium in the pipeline through an elastic rod and a valve disc. Furthermore, a control component is electrically connected to the elastic rod to monitor its rotation angle. Since the length of the elastic rod remains constant, the control component can determine the vertical position of the valve disc, i.e., the degree of valve opening, based on the rotation angle of the elastic rod. Therefore, this check valve can prevent backflow of the medium in the pipeline, thereby ensuring the safety of the plant. Simultaneously, it can remotely monitor the valve opening degree, helping personnel prevent accidents. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of an existing check valve.

[0018] Figure 2 This is a top view of a check valve in some embodiments of the present invention;

[0019] Figure 3 This is a schematic diagram of the structure of the check valve in some embodiments of the present invention;

[0020] Figure 4 This is a schematic diagram of the structure of the control component in some embodiments of the present invention.

[0021] In the diagram: 1a-valve body, 1b-valve body, 11-fluid cavity, 12-inlet, 13-outlet, 2a-valve disc, 2b-valve disc, 21-sealing ring, 3-elastic rod, 31-connecting rod, 32-rotating shaft, 33-torsion elastic element, 34-connecting shaft, 4-control component, 41-scale, 5-pipe, 6-control handle, 7-spring. Detailed Implementation

[0022] The technical solutions of the invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the invention, not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without creative effort are within the scope of the invention.

[0023] In the description of this invention, it should be noted that the terms "upper", "lower", "upstream", "downstream", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience and simplification of 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 invention.

[0024] In the description of this invention, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0025] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connection," "setting," "installation," "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0026] Example 1

[0027] Please see Figure 2 and Figure 3 The present invention discloses a check valve, comprising a valve body 1b, a valve disc 2b, an elastic rod 3, and a control component 4.

[0028] The valve body 1b is installed in the pipeline 5 and has a fluid cavity 11 inside. One end of the valve body 1b has an inlet 12, and the other end has an outlet 13. The inlet 12 faces upstream of the valve body 1b, and the outlet 13 faces downstream. Both the inlet 12 and outlet 13 are connected to the fluid cavity 11. The valve disc 2b is located inside the fluid cavity 11 of the valve body 1b, with its upper end face abutting against the inner wall of the upper end of the fluid cavity 11. It is used to block the inlet 12 to prevent the medium in the pipeline 5 from flowing back from the outlet 13 to the inlet 12. One end of the elastic rod 3 is rotatably connected to the valve body 1b, and the other end is rotatably connected to the valve disc 2b. The elastic rod 3 swings to move the valve disc 2b vertically. The control component 4 is electrically connected to the elastic rod 3 to monitor the rotation angle of the elastic rod 3 and determine the vertical position of the valve disc 2b based on the rotation angle information of the elastic rod 3, thus obtaining the valve opening degree information.

[0029] like Figure 2 and Figure 3 As shown, the elastic rod 3 is connected to the valve disc 2b. The elastic rod 3 has an upward elastic force, which can drive the valve disc 2b upward to fit against the inner wall of the upper end of the fluid cavity 11. Therefore, under normal conditions, the elastic rod 3 will lift the valve disc 2b, so that the valve disc 2b abuts against the upper end of the valve body 1b. When the upstream medium enters the valve body 1b, it can overcome the elastic force and push the valve disc 2b open. At this time, the upstream medium flows through the inlet 12, the fluid cavity 11 and the outlet 13 in sequence to the downstream of the pipeline 5. However, if a fault occurs, causing the downstream medium to flow back into the fluid cavity 11, the fluid medium and the elastic rod 3 will jointly lift the valve disc 2b, so that the upper end face of the valve disc 2b fits against the inner wall of the upper end of the valve body 1b, thereby blocking the inlet 12 of the valve body 1b. Therefore, this check valve can prevent the backflow of the medium in the pipeline 5, thereby ensuring the safety of the plant.

[0030] In addition, a sealing ring 21 is provided at the edge of the upper end face of the valve disc 2b. The sealing ring 21 is used to seal the gap between the valve disc 2b and the inner wall of the fluid cavity 11 when the upper end face of the valve disc 2b is in contact with the inner wall of the upper end of the fluid cavity 11.

[0031] Preferably, the valve body 1b, valve disc 2b, and elastic rod 3 are all made of stainless steel.

[0032] Furthermore, the control component 4 is connected to the elastic rod 3 to monitor the rotation angle of the elastic rod 3. Since the length of the elastic rod 3 remains constant, the control component 4 can determine the vertical position of the valve disc 2b based on the rotation angle of the elastic rod 3. The vertical position of the valve disc 2b is the opening degree of the check valve. Therefore, this check valve also has the function of remotely monitoring the valve opening degree, which allows operators to conveniently monitor the flow of the medium inside the valve body 1b in real time.

[0033] like Figure 1 As shown, Figure 1 This is a schematic diagram of an existing check valve. It should be noted that the existing check valve includes a valve body 1a and a valve disc 2a. The valve disc 2a is connected to the lower end of the valve body 1a via an elastic element. Its working principle is as follows: when the upstream medium enters the valve body 1a, it overcomes the elastic force and pushes the valve disc 2a open. At this time, the upstream medium flows sequentially through the inlet 12, the fluid chamber 11, and the outlet 13 to the downstream of the pipeline 5. However, if a malfunction occurs, causing the downstream medium to flow back into the fluid chamber 11, the fluid medium and the elastic element 3 will jointly push the valve disc 2a up, causing the upper end face of the valve disc 2a to adhere to the inner wall of the upper end of the valve body 1a, thus sealing the inlet 12 of the valve body 1a. Therefore, the existing check valve can prevent the backflow of the medium in the pipeline 5. However, the existing check valve lacks real-time monitoring functionality. When the medium pressure inside valve body 1a is too high, it can easily lead to damage to valve body 1a and valve disc 2a. Once valve body 1a and valve disc 2a are damaged, a pollution accident can easily occur.

[0034] Compared to existing check valves, the check valve in this embodiment can prevent liquid backflow in pipeline 5 and remotely monitor the valve opening, making it convenient for staff to understand the medium flow in valve body 1b in real time.

[0035] Please see Figure 2 and Figure 3 In this embodiment, the elastic rod 3 includes a connecting rod 31, a rotating shaft 32, and a connecting shaft 34. The rotating shaft 32 extends horizontally and passes through the valve body 1b. The rotating shaft 32 can rotate around its own axis. One end of the connecting rod 31 is fixedly connected to the rotating shaft 32, and the other end is rotatably connected to the valve disc 2b. The connecting rod 31 can swing as the rotating shaft 32 rotates, thereby driving the valve disc 2b to move vertically. In addition, the connecting shaft 34 is arranged horizontally, located on the outside of the valve body 1b, and parallel to the rotating shaft 32. Both ends of the connecting shaft 34 and the rotating shaft 32 are connected by torsional elastic elements 33. Specifically, there are two torsional elastic elements 33, which are located on the left and right sides of the connecting shaft 34, respectively. The connecting shaft 34 is parallel to the rotating shaft 32, and both ends of the connecting shaft 34 and the rotating shaft 32 are connected by two torsional elastic elements 33, respectively. Since the torque elastic element 33 is placed on the outside of the valve body 1b, it can save the internal space of the valve, reduce the space occupation, and facilitate the replacement of the torque elastic element 33 by the staff without causing pollution, thus improving the reusability of this check valve.

[0036] Specifically, the connecting rod 31 and the rotating shaft 32 form a transmission mechanism. One side of the mechanism connects to the torsion elastic element 33 and the connecting rod, while the other side connects to the valve disc 2b. Its main function is to convert the movement of the valve disc 2b and the rotation of the torsion elastic element 33 into mutual conversion. During use, as the valve disc 2b is forced open by the pressure of the fluid medium, it drives the connecting rod 31 and the rotating shaft 32 to rotate synchronously, which in turn drives the torsion elastic element 33 and the connecting rod to rotate. The torsion elastic element 33 is a spring-loaded spring. For example, the torsion elastic element 33 can be a commercially available Z4113 type spring-loaded spring manufactured by Jinding Company.

[0037] Furthermore, this check valve also includes a control handle 6, which is connected to the connecting shaft 34 and used to drive the connecting shaft 34 to rotate, thereby driving the rotating shaft 32 and the connecting rod 31 to rotate, so as to adjust the valve opening. It should be noted that when the valve opening is adjusted by rotating the control handle 6, the spring will undergo elastic deformation, i.e., generate elastic potential energy; at this time, the valve disc 2b is subjected to the medium pressure and the spring force. Under normal circumstances, the valve disc 2b is in a state of equilibrium. Therefore, during the adjustment of the valve opening, when the control handle 6 is released, the handle will not spring back to its original position, but will stop at a certain position, so that the spring force acting on the valve disc 2b and the medium pressure reach equilibrium, thereby achieving the function of positioning the valve opening. Therefore, when the operator needs to adjust the valve opening of this check valve, they can manually operate the control handle 6 to adjust the valve opening.

[0038] Further, please refer to Figure 4 In this embodiment, the control component 4 includes a controller and a scale 41, which are electrically connected. The scale 41 is connected to the torsion elastic element 33 and is used to monitor the rotation angle of the torsion elastic element 33 and send the rotation angle information to the controller. The controller is used to calculate the position of the valve disc 2b in the vertical direction based on the rotation angle information.

[0039] Specifically, the torque elastic element 33 is connected to the pointer on the scale 41. When the torque elastic element 33 rotates, it drives the pointer of the scale 41 to rotate. On-site personnel can determine the valve opening by reading the scale indicated by the pointer. During normal operation of this check valve, the spring force on valve disc 2b and the medium pressure are balanced. The scale pointer rotates synchronously with the torque elastic element 33, and the pointer reading indicates the degree of spring deformation. According to the spring force formula F = kx, the degree of spring deformation is directly proportional to the spring force generated by the spring. The valve opening is determined based on the medium flow rate, which is positively correlated with the pressure it generates. In summary, personnel can understand the valve opening by monitoring the scale 41 reading. Furthermore, the scale 41 also sends rotation angle information to the controller based on the pointer's rotation angle. The controller, based on the rotation angle information of the torque elastic element 33, determines the vertical position of valve disc 2b, i.e., the valve opening of this check valve.

[0040] It should also be noted that the valve opening degree is related to the elastic coefficient of the torsion elastic element 33. This check valve is suitable for pipelines containing different media. Because the media in pipeline 5 differ and the required flow rate varies, the required valve opening degree will also differ. Therefore, the greater the required flow rate, the greater the pressure exerted on valve disc 2b. If a certain valve opening degree is desired under different media and flow rates, a torsion elastic element 33 with a different elastic coefficient needs to be selected.

[0041] Specifically, the torque elastic element 33 is connected to the valve body 1b via a spring shaft. The spring shaft passes through the valve body 1b, and two torque elastic elements 33 are respectively sleeved on both ends of the spring shaft. The torque elastic elements 33 are connected to the spring shaft via a key. Furthermore, the torque elastic element 33 is mechanically connected to the rotating shaft 32 and the connecting shaft 34. The torque elastic element 33 is connected to both the rotating shaft 32 and the connecting shaft 34 via couplings. Because the torque elastic element 33 is located on the outside of the valve body 1b, operators can easily disassemble and replace the torque elastic element 33 with one of suitable elasticity coefficient without causing leakage of radioactive media from the pipeline, thus preventing contamination.

[0042] In this embodiment, the control component 4 also includes a pressure sensor, which is disposed in the fluid cavity 11 of the valve body 1b and electrically connected to the controller. The pressure sensor monitors the medium pressure within the valve body 1b and sends it to the controller. The controller has a pre-stored standard pressure, which is used to compare the received medium pressure information with the standard pressure to measure the deviation. The controller also has a preset allowable value, which is used to determine whether the medium pressure in the pipeline 5 is abnormal based on the magnitude of the deviation value and the allowable value. The specific judgment process is as follows: when the deviation value is greater than the allowable value, the medium pressure in the pipeline 5 is determined to be abnormal; when the deviation value is less than or equal to the allowable value, the medium pressure in the pipeline 5 is determined to be normal. Therefore, the control component 4 of this check valve can monitor the medium flow inside the pipe section in real time through the pressure sensor.

[0043] Furthermore, control component 4 also includes a motor, the output of which is connected to connecting shaft 34. The controller is also electrically connected to the motor and is used to start the motor when an abnormality is detected in the medium pressure within pipeline 5, thereby rotating the connecting shaft 34 to adjust the opening of valve disc 2b, and thus regulating the medium pressure inside pipeline 5 until the controller determines that the medium pressure inside pipeline 5 is normal. The controller is also used to stop the motor when the medium pressure inside pipeline 5 is determined to be normal. Control component 4 can also automatically calibrate the valve opening via the motor, effectively preventing accidents.

[0044] In summary, this check valve offers two adjustment methods: manual adjustment of the valve opening degree and automatic adjustment via a pressure sensor and motor. Specifically, on-site personnel can manually adjust the control handle 6 to regulate the valve opening. Meanwhile, personnel in the control room can directly set the valve opening degree to be automatically adjusted via the pressure sensor and motor.

[0045] like Figure 4 As shown, control component 4 can be implemented using computer equipment for monitoring and control. Control component 4 specifically includes a display area and an operating area. Personnel not on-site can read the check valve opening information through the display area and issue control commands to the motor through the operating area. The display area can be a commercially available display screen.

[0046] The working process of this check valve is as follows: The movement of valve disc 2b drives the rotation of torque elastic element 33. The valve opening degree corresponds to the elastic force of torque elastic element 33 and the reading on the dial indicator, and the corresponding valve opening degree is displayed on the scale 41 via the pointer. On-site personnel can determine the valve opening degree by reading the value on the scale 41. Control handle 6 is connected to torque elastic element 33. When control handle 6 is rotated, torque elastic element 33 tightens accordingly. Through the transmission and conversion of force, it drives the connecting rod 31 and valve disc 2b to move, thus adjusting the opening degree. Therefore, on-site personnel can directly adjust the valve opening degree using control handle 6. Additionally, scale 41 is connected to control component 4 to transmit the corresponding rotation angle information to control component 4. Control component 4 displays the valve opening degree on a display screen. Personnel in the control room can read the valve opening degree through the display screen of control component 4. The controller can monitor the flow of the medium inside pipeline 5 in real time through a pressure sensor and achieve automatic calibration, effectively preventing accidents. Furthermore, this check valve can be equipped with torsion elastic elements 33 with different spring coefficients, which can be easily replaced externally to meet the needs of different operating conditions.

[0047] In summary, this check valve has the advantages of being simple and flexible, occupying little space, highly reusable, safe and economical, and can be widely used in the field of reagent supply systems for highly radioactive and highly toxic substances.

[0048] Example 2

[0049] The present invention also discloses a piping system for a nuclear fuel reprocessing plant, including pipe 5 and the check valve in embodiment 1.

[0050] Pipeline 5 is used to supply spent fuel medium for circulation, and a check valve is installed in pipeline 5 to prevent the spent fuel medium in pipeline 5 from flowing back.

[0051] Specifically, to prevent radiation contamination, the reprocessing plant is divided into zones based on radiation dose and air pollution levels during operation. Entry into high-radiation zones is strictly prohibited, and the design must control the potential for contamination of other areas from this zone. During the reprocessing process, radioactive media such as steam, deionized water, and compressed air need to enter the high-radiation zone through pipeline 5. To prevent atmosphere leakage from the high-radiation zone to the safe zone, the media transportation process must ensure unidirectional flow from the safe zone to the high-radiation zone and maintain a tight seal. The check valves in this piping system ensure unidirectional flow of these radioactive media, preventing backflow of spent fuel and thus guaranteeing safety within the plant. Furthermore, the sealing ring 21 in the check valve provides a proper seal.

[0052] In addition, the check valve in this pipeline system also has the function of remotely monitoring the valve opening, which can facilitate the staff to monitor the medium flow in the valve body 1b in real time and prevent accidents from occurring.

[0053] Taking the pipeline system 5 used for transporting deionized water as an example, the working process of this pipeline system 5 will be described. One end of pipeline 5 is connected to the main deionized water pipeline in the green zone, and the other end is connected to the equipment port in the red zone, for transporting deionized water. When transporting the medium, the working pressure of pipeline system 5 is 0.4 MPa, the working flow rate is 10 L / min, and the elastic coefficient of the torsional elastic element 33 used is 20 N / mm. The check valve is installed in the middle of pipeline 5. Specifically, the elastic rod 3 in the check valve is connected to the valve disc 2b. The elastic rod 3 has an upward elastic force, which can drive the valve disc 2b to move upward to fit against the inner wall of the upper end of the fluid cavity 11. Therefore, under normal conditions, the elastic rod 3 will lift the valve disc 2b, so that the valve disc 2b abuts against the upper end of the valve body 1b. When the upstream medium enters the valve body 1b, it overcomes the elastic force and opens the valve disc 2b. At this time, the upstream medium flows sequentially through the inlet 12, fluid chamber 11, and outlet 13 to the downstream of the pipeline 5. The movement of the valve disc 2b drives the torsional elastic element 33 to rotate. The valve opening is correlated with the elastic force of the torsional elastic element 33 and the dial pointer reading, and the corresponding valve opening is displayed on the scale 41 via the pointer. The scale 41 is connected to the control component 4 to transmit the corresponding rotation angle information to the control component 4. The control component 4 displays the valve opening on a display screen. Personnel in the control room can read the valve opening through the display screen of the control component 4. The controller can monitor the flow of the medium inside the pipeline 5 in real time through a pressure sensor and achieve automatic calibration, effectively preventing accidents.

[0054] Therefore, this pipeline system can monitor the flow of media in pipeline 5 in real time, thereby reducing the occurrence of pollution accidents.

[0055] It is understood that the above embodiments are merely exemplary implementations used to illustrate the principles of the present invention, and the present invention is not limited thereto. For those skilled in the art, various modifications and improvements can be made without departing from the spirit and essence of the present invention, and these modifications and improvements are also considered to be within the scope of protection of the present invention.

Claims

1. A check valve, characterized in that, include: Valve body (1b), valve disc (2b), elastic rod (3), and control assembly (4); The valve body (1b) is installed in the pipe (5) and has a fluid cavity (11) inside. One end of the valve body (1b) has a liquid inlet (12) and the other end has a liquid outlet (13). The liquid inlet (12) faces upstream of the valve body (1b) and the liquid outlet (13) faces downstream of the valve body (1b). Both the liquid inlet (12) and the liquid outlet (13) are connected to the fluid cavity (11). The valve disc (2b) is located in the fluid cavity (11) of the valve body (1b), and its upper end face is attached to the inner wall of the upper end of the fluid cavity (11) to block the inlet (12) so as to prevent the medium in the pipeline (5) from flowing back from the outlet (13) to the inlet (12). One end of the elastic rod (3) is rotatably connected to the valve body (1b), and the other end is rotatably connected to the valve disc (2b). The elastic rod (3) drives the valve disc (2b) to move vertically by swinging. The control component (4) is electrically connected to the elastic rod (3) and is used to monitor the rotation angle of the elastic rod (3) and determine the vertical position of the valve disc (2b) based on the rotation angle information of the elastic rod (3) in order to obtain the valve opening degree information. The elastic member (3) includes a connecting rod (31) and a rotating shaft (32). The rotating shaft (32) extends horizontally and passes through the valve body (1b). The rotating shaft (32) is capable of rotating about its own axis. One end of the connecting rod (31) is fixedly connected to the rotating shaft (32), and the other end is rotatably connected to the valve disc (2b). The connecting rod (31) can swing with the rotating shaft (32) and thus drive the valve disc (2b) to move in the vertical direction. The elastic member (3) also includes a connecting shaft (34). The connecting shaft (34) is arranged horizontally, located outside the valve body (1b), and parallel to the rotating shaft (32). Both ends of the connecting shaft (34) and the rotating shaft (32) are connected by a torsion elastic element (33); The connecting shaft (34) can rotate around its own axis to trigger the elastic deformation of the torsion elastic element (33), thereby driving the rotating shaft (32) to rotate.

2. The check valve according to claim 1, characterized in that, The torsional elastic element (33) is a clock spring.

3. The check valve according to claim 1, characterized in that, It also includes a control handle (6), which is connected to the connecting shaft (34) and is used to drive the connecting shaft (34) to rotate, thereby driving the rotating shaft (32) and the connecting rod (31) to rotate, so as to adjust the opening of the valve disc (2b).

4. The check valve according to claim 3, characterized in that, The control component (4) includes a controller and a scale (41), which are electrically connected. The scale (41) is connected to the torque elastic element (33) and is used to monitor the rotation angle of the torque elastic element (33) and send the rotation angle information to the controller. The controller is used to calculate the position of the valve disc (2b) in the vertical direction based on the rotation angle information.

5. The check valve according to claim 4, characterized in that, The control component (4) further includes a pressure sensor disposed within the fluid chamber (11) of the valve body (1b) and electrically connected to the controller. The pressure sensor monitors the medium pressure within the valve body (1b) and transmits it to the controller. The controller has a pre-stored standard pressure, which is used to compare the received medium pressure with the standard pressure to measure the deviation value. The controller also has a preset allowable value, which is used to determine whether the pressure of the medium in the pipeline (5) is abnormal based on the magnitude of the deviation value and the allowable value.

6. The check valve according to claim 5, characterized in that, The control component (4) also includes a motor, the output end of which is connected to the connecting shaft (34). The controller is also electrically connected to the motor and is used to control the motor to start when it is determined that the medium pressure in the pipeline (5) is abnormal, so as to drive the connecting shaft (34) to rotate, thereby adjusting the opening of the valve disc (2b) and thus adjusting the medium pressure inside the pipeline (5) until the controller determines that the medium pressure inside the pipeline (5) is normal. The controller is also used to control the motor to stop operating when it is determined that the pressure of the medium in the pipeline (5) is normal.

7. The check valve according to claim 1, characterized in that, A sealing ring (21) is provided at the edge of the upper end face of the valve disc (2b). The sealing ring (21) is used to seal the gap between the valve disc (2b) and the inner wall of the fluid cavity (11) when the upper end face of the valve disc (2b) is attached to the inner wall of the upper end of the fluid cavity (11).

8. A piping system for a nuclear fuel reprocessing plant, characterized in that, Includes the pipe (5) and the check valve as described in any one of claims 1-7, The pipe (5) is used to supply radioactive media for flow, and the check valve is installed in the pipe (5) to prevent the radioactive media in the pipe (5) from flowing back.

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