A valve operating device for nuclear power plants and a method for installing the same

Abstract

This invention relates to the field of nuclear power valve technology, and more particularly to a valve operating device and its installation method for nuclear power plants. The device includes a valve installed inside a shielded door, the shielded door having an operating through-hole. The valve stem is connected axially to one end of an extension rod, the valve stem and the extension rod being connected via a valve adapter. An operating component passes through the operating through-hole and is detachably connected to the other end of the extension rod inside the shielded door. The operating component drives the extension rod to rotate, thereby opening and closing the valve. A shielding plate is provided on the outer side of the shielded door, and a shielding plug for sealing the operating through-hole is detachably connected to the shielding plate. This valve operating device for nuclear power plants allows for the use of a relatively short extension rod, reducing valve stem pressure, increasing valve lifespan, while not affecting the opening and closing function of the shielded door, and reducing the risk of radiation exposure to technicians.

Description

Technical Field

[0001] This invention relates to the field of nuclear power valve technology, and in particular to a valve operating device for nuclear power plants and its installation method. Background Technology

[0002] Valves are a common component in nuclear power systems. Because the medium through which valves pass contains radioactive materials that generate radiation, a shielding door is installed between the valve and the outside environment to isolate the valve and prevent radiation leakage.

[0003] When valves need to be operated to control their opening or closing, the shielding door must be opened to operate the valves, which exposes the operator to severe radiation. To avoid radiation exposure, the current method involves creating a circular hole in the shielding door, extending the valve stem, and fabricating a special interface. A valve extension rod is also installed on the shielding door, along with a universal operating handle. During operation, the operating handle is aligned with the valve extension rod, causing the valve core to rotate and thus close or open the valve. When the valve is not in operation, the operating rod is typically removed and stored in a designated location. A shielding plug is then placed on the outside of the shielding door opening, and the door is secured to the outer shielding door with bolts.

[0004] However, the existing operating devices have two problems. First, the extension rod is too long and heavy, causing the valve stem to bear significant pressure for extended periods, shortening the valve's lifespan, increasing maintenance frequency, and raising the risk of radiation exposure to technicians. Second, when components inside the shielding door require repair, the operating device must be disassembled before the door can be opened, and then reinstalled after repair. During disassembly and reassembly, components are easily damaged, significantly increasing maintenance costs and raising the risk of radiation exposure to technicians. Summary of the Invention

[0005] In view of the above-mentioned shortcomings of the current operating devices, the present invention provides a valve operating device for nuclear power plants, which can use a relatively short extension rod to reduce the pressure on the valve stem, improve the service life of the valve, and at the same time, not affect the opening function of the shielding door, and reduce the risk of radiation to technicians.

[0006] To achieve the above objectives, the embodiments of the present invention adopt the following technical solutions:

[0007] A valve operating device for a nuclear power plant includes a valve disposed within a shielding door, the shielding door having an operating through-hole, a valve stem connected axially to one end of an extension rod, the valve stem and the extension rod being connected via a valve adapter, an operating component passing through the operating through-hole and detachably connected to the other end of the extension rod within the shielding door, the operating component driving the extension rod to rotate to open and close the valve; a shielding plate is disposed on the outer side of the shielding door, and a shielding plug for sealing the operating through-hole is detachably connected to the shielding plate.

[0008] According to one aspect of the invention, the valve adapter includes a first clamping block and a second clamping block, the first clamping block and the second clamping block closing relative to each other and jointly clamping the valve stem.

[0009] According to one aspect of the present invention, both the first clamping block and the second clamping block are provided with a set hole and a locking hole, a set screw passes through the set hole and presses against the valve stem, and a locking screw passes through the locking hole to connect and lock the first clamping block and the second clamping block.

[0010] According to one aspect of the present invention, the outer end of the extension rod is provided with a groove, the outer end of the groove is provided with a guide portion, the operating component is provided with a protrusion that matches the groove, and the guide portion guides the protrusion to be inserted into the groove.

[0011] According to one aspect of the invention, the operating component includes an operating lever connected to the extension rod, the operating lever having a handle, and the protrusion being disposed at the inner end of the operating lever.

[0012] According to one aspect of the invention, the operating lever is provided with a limit structure.

[0013] According to one aspect of the present invention, the shielding plate is provided with a bushing cover, the bushing cover is provided with a limiting portion, and the limiting structure is connected to the limiting portion.

[0014] According to one aspect of the invention, the outer surface of the bushing cover is provided with a switch mark, the switch mark being used to indicate the opening and closing direction of the valve operated by the operating component.

[0015] According to one aspect of the invention, a bushing is provided between the operating component and the shielding plate, the bushing being pressed against the shielding plate by a bushing cover.

[0016] An installation method for a valve operating device in a nuclear power plant includes the following steps;

[0017] Based on the position of the valve, locate the operating through hole and the shielding plate on the shielding door, and open the operating through hole and weld the shielding plate according to the positioning.

[0018] Confirm and adjust the valve to be fully open or fully closed;

[0019] After assembling the valve adapter and the extension rod, install them onto the valve;

[0020] Close the shielding door, insert the operating component and connect it to the extension rod, and confirm the connection status;

[0021] The valve is opened and closed by rotating the extension rod through the operating component. After confirming that there are no problems with the valve opening and closing, the valve is put in the open state.

[0022] Remove the operating components and install the shielding plug.

[0023] The advantages of this invention are as follows: The clamp-type valve adapter ensures a more secure fixation between the valve extension rod and the valve stem, preventing stem sagging and guaranteeing valve stability and reliability. Furthermore, the adapter easily adapts to valve stems of various specifications, eliminating the need for custom valves. This facilitates the addition of the adapter to existing valves and reduces the additional costs associated with valve customization. The extension rod has a groove at its outer end, while the operating rod has a matching protrusion at its inner end. During operation, the groove and protrusion engage easily and precisely, allowing for easy opening of valves with higher torque. The valve extension rod can be kept as short as possible, reducing weight and pressure on the valve stem, thus extending valve lifespan and lowering maintenance costs. The operating component is highly versatile; a single, longer component can accommodate various valve extension rods of different lengths, offering wide applicability. It eliminates the need for a separate operating component for each valve, significantly reducing the overall cost of the operating device. The extension rod's placement within the shielding door does not affect the door's opening and closing function, nor does the door's operation impact the operating device's functionality. By incorporating a limiting structure on the operating rod and a limiting part on the bushing gland, the operating rod can rotate stably and precisely within a 90-degree opening and closing range. This ensures more accurate and reliable valve opening and closing operations, and the structure is simple and robust. The valve operating device provided by this invention, specifically designed for nuclear power plants, employs a relatively short extension rod design. This not only effectively reduces the pressure on the valve stem and improves the valve's service life, but also ensures that the normal opening and closing function of the shielding door is not affected. This helps reduce the radiation risks that technicians may face during operation, providing strong protection for the safe operation of nuclear power plants. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 This is a schematic diagram of a valve operating device for a nuclear power plant according to the present invention;

[0026] Figure 2 This is a cross-sectional view of a valve adapter for a valve operating device in a nuclear power plant, as described in this invention.

[0027] Figure 3 This is a front view of a bushing gland for a valve operating device in a nuclear power plant, as described in this invention.

[0028] Figure 4 This is a reverse view of a bushing gland for a valve operating device in a nuclear power plant, as described in this invention.

[0029] Figure 5 This is a structural view of an operating assembly for a valve operating device in a nuclear power plant, as described in this invention.

[0030] Figure 6 This is a structural view of a nuclear power plant valve operating device after the installation of a shielding plug, as described in this invention.

[0031] Figure 7 The present invention provides a plan and cross-sectional view of an operating lever for a valve operating device in a nuclear power plant.

[0032] Figure 8 This is a three-dimensional structural view of an operating lever for a valve operating device in a nuclear power plant, as described in this invention.

[0033] Numbering on the map:

[0034] 1. Valve; 11. Valve stem; 2. Valve adapter; 21. Set hole; 22. Locking hole; 23. First clamping block; 24. Second clamping block; 3. Extension rod; 31. Fixing screw; 32. Groove; 33. Guide part; 34. Valve stem groove; 4. Shielding door; 41. Operating through hole; 6. Operating component; 61. Operating lever; 62. Handle; 63. Limiting structure; 64. Protrusion; 7. Shielding plate; 71. Inner through hole; 8. Bushing cover; 81. Limiting part; 82. Switch mark; 83. Bushing screw; 84. Outer through hole; 9. Bushing; 10. Shielding plug; 101. Shielding screw; 102. Through hole boss. Detailed Implementation

[0035] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0036] Example 1:

[0037] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 As shown, a valve operating device for a nuclear power plant includes a valve 1 disposed within a shielding door 4. The shielding door 4 has an operating through-hole 41. The valve stem 11 of the valve 1 is axially connected to one end of an extension rod 3. The valve stem 11 and the extension rod 3 are connected via a valve adapter 2. Specifically, the valve adapter 2 is mounted on the valve stem 11 of the valve 1. An operating component 6 passes through the operating through-hole 41 and is detachably connected to the other end of the extension rod 3 within the shielding door 4. The operating component 6 drives the extension rod 3 to rotate, thereby opening and closing the valve 1. A shielding plate 7 is disposed on the outer side of the shielding door 4, and a shielding plug 10 for sealing the operating through-hole 41 is detachably connected to the shielding plate. The extension rod 3 can be selected as short as possible to reduce the pressure exerted by the extension rod's own weight on the valve stem and reduce the phenomenon of extension rod sagging.

[0038] In this embodiment, the shielding plate 7 is welded to the shielding door 4, and the shielding plate 7 is provided with an inner through hole 71, the axis of which coincides with the axis of the operating through hole 41. Preferably, the diameter of the inner through hole 71 is smaller than the diameter of the operating through hole 41.

[0039] The shielding door 4 is used to isolate valve 1, thereby isolating radioactive materials and preventing them from emitting radiation. The shielding door 4 can be opened when needed, and its opening method can be set to a swing-open or push-pull mechanism depending on the environment, to facilitate maintenance and other operations on the valve and its internal components. The shielding plug 10 is provided with countersunk holes for installing shielding screws; preferably, the shielding plug 10 is provided with a through-hole boss 102. The shielding plug is used to seal the operating through-hole 41, shielding against radiation.

[0040] In this embodiment, the valve adapter 2 includes a first clamping block 23 and a second clamping block 24. The first clamping block 23 and the second clamping block 24 close together to clamp the valve stem 11. That is, the first clamping block 23 and the second clamping block 24 are provided with valve stem holes that match the valve stem 11. Typically, the size and style of the valve stem 11 have relevant standards, so we can precisely design the valve stem holes according to the size requirements of the valve stem 11, enabling the valve adapter 2 to better fit the valve stem 11, thereby expanding the applicability of the operating device. In this embodiment, both the first clamping block 23 and the second clamping block 24 are provided with a set hole 21 and a locking hole 22. The set screw passes through the set hole 21 and presses against the valve stem 11, and the locking screw passes through the locking hole 22 to connect and lock the first clamping block 23 and the second clamping block 24. The extension rod 3 is fixedly connected to the first clamping block 23 and the second clamping block 24 by locking screws. The valve adapter 2 adopts a clamp-type setting, which makes the valve extension rod more firmly connected to the valve and prevents sagging, thereby reducing valve pressure.

[0041] In this embodiment, the outer end of the extension rod 3 is provided with a groove 32, and the inner end of the extension rod is provided with a valve stem groove. The valve stem groove is used to accommodate the valve stem 11, preventing the extension rod 3 from being improperly installed when it is installed with the valve adapter 2. The outer end of the groove 32 is provided with a guide portion 33, and the operating component 6 is provided with a protrusion 64 that matches the groove 32. The guide portion 33 guides the protrusion 64 to be inserted into the groove 32.

[0042] In this embodiment, the operating component 6 includes an operating rod 61 connected to the extension rod 3, a handle 62 is provided on the operating rod 61, and the protrusion 64 is provided at the inner end of the operating rod 61.

[0043] In this embodiment, a limiting structure 63 is provided on the operating rod 61. The limiting structure provides limiting grooves on both sides of the protrusion 64. The two limiting grooves extend along the operating rod 61 and merge into one large groove. The angle of the large groove surface is preferably 90°, so that the operating rod can rotate within a 90-degree angle range, thereby realizing precise control of the valve.

[0044] In this embodiment, a bushing cover 8 is provided on the shielding plate 7, and an external through hole 84 is provided on the bushing cover 8, the axis of which coincides with the axis of the internal through hole 71. A limiting part 81 is provided on the bushing cover 8, and a limiting structure 63 is connected to the limiting part 81. During operation, the limiting structure 63 of the operating component 6 is inserted into the limiting part 81, and the direction and position of the adjusting operating rod 61 are controlled and adjusted to match the direction and position of the groove 32 according to the opening and closing state of the valve. During operation, according to the current opening and closing state of the valve, the direction of the handle 62 is inserted into the operating rod 61 in the direction of the switch mark. At this time, the limiting part 81 is connected to one of the limiting grooves. The operating rod is inserted along the side of the limiting groove away from the center of the protrusion 64, so that the direction and position of the groove 32 are matched, and the protrusion 64 and the groove 32 are precisely matched. By limiting the limit part 81 and the limit structure 63, the operating rod 61 can rotate within a 90-degree angle range, thereby accurately controlling the opening and closing of the valve, and the structure is simple and robust.

[0045] In this embodiment, a bushing 9 is provided between the operating component 6 and the shielding plate 7, and the bushing 9 is pressed against the shielding plate 7 by the bushing cover 8. Preferably, the bushing 9 is a flanged bushing, and the flanged structure of the bushing 9 is tightly pressed against the shielding plate 7 by the bushing cover 8. The bushing 9 is made of graphite copper, which has good wear resistance and self-lubricating properties, facilitating the rotation of the operating rod 61. The bushing can effectively seal the operating component after it is inserted into the through hole, thereby reducing the diffusion of radioactive materials and ensuring the safety of the operating environment; at the same time, it can also significantly reduce the wear of the operating rod 61 during use, extend the service life of the equipment, and improve the overall working efficiency and reliability.

[0046] In this embodiment, a switch indicator 82 is provided on the outer surface of the bushing cover 8. This switch indicator is used to identify the opening and closing direction of the valve 1 operated by the operating component 6. When the operator needs to close or open the valve, they can perform the corresponding operation according to the specific direction indicated by the switch indicator 82. This allows the operator to more intuitively and accurately grasp the valve's opening and closing status, effectively avoiding misoperation and improving work efficiency and safety. The design of the switch indicator 82 not only simplifies the operation process but also greatly enhances the user-friendliness of the entire system.

[0047] In this embodiment, the axes of the operating through hole 41, the extension rod 3, the inner through hole 71, and the outer through hole 84 are all coincident, ensuring that when the operating rod 61 is inserted into the through hole, it can be quickly and efficiently connected to the extension rod 3. The through hole boss 102 is inserted into the outer through hole 84 to ensure that the shielding plug 10 can completely shield radioactive materials.

[0048] In this embodiment, if the distance between the shielding door 4 and the extension rod 3 is long, considering the weight of the operating component 6, a support bracket (not shown in the figure) can be installed at a position that does not affect the opening of the shielding door. The support bracket can be Y-shaped, or the upper end can be a ring with a support rod supporting it below, etc. The number of support brackets is not limited and can be set according to actual needs. The support bracket can support and guide the operating rod 61 to connect with the groove 32 of the extension rod 3 in a predetermined direction.

[0049] The advantages of this invention are as follows: The clamp-type valve adapter ensures a more secure fixation between the valve extension rod and the valve stem, preventing stem sagging and guaranteeing valve stability and reliability. Furthermore, the adapter easily adapts to valve stems of various specifications, eliminating the need for custom valves. This facilitates the addition of the adapter to existing valves and reduces the additional costs associated with valve customization. The extension rod has a groove at its outer end, while the operating rod has a matching protrusion at its inner end. During operation, the groove and protrusion engage easily and precisely, allowing for easy opening of valves with higher torque. The valve extension rod can be kept as short as possible, reducing weight and pressure on the valve stem, thus extending valve lifespan and lowering maintenance costs. The operating component is highly versatile; a single, longer component can accommodate various valve extension rods of different lengths, offering wide applicability. It eliminates the need for a separate operating component for each valve, significantly reducing the overall cost of the operating device. The extension rod's placement within the shielding door does not affect the door's opening and closing function, nor does the door's operation impact the operating device's functionality. By incorporating a limiting structure on the operating rod and a limiting part on the bushing gland, the operating rod can rotate stably and precisely within a 90-degree opening and closing range. This ensures more accurate and reliable valve opening and closing operations, and the structure is simple and robust. The valve operating device provided by this invention, specifically designed for nuclear power plants, employs a relatively short extension rod design. This not only effectively reduces the pressure on the valve stem and improves the valve's service life, but also ensures that the normal opening and closing function of the shielding door is not affected. This helps reduce the radiation risks that technicians may face during operation, providing strong protection for the safe operation of nuclear power plants.

[0050] Example 2

[0051] An installation method for a valve operating device in a nuclear power plant according to Embodiment 1 includes the following steps;

[0052] S1: Based on the position of valve 1, locate the position of operating through hole 41 and shielding plate 7 on shielding door 4, and open operating through hole 41 and weld shielding plate 7 according to the positioning.

[0053] During the installation of the operating device, the shielding door 4 and valve 1 are usually pre-installed on site. Next, the installation position of the operating device needs to be determined based on the specific location of valve 1. To ensure accuracy, specialized positioning tools are typically used for assistance. First, the position and dimensions of the operating through-hole 41 and the shielding plate 7 are precisely located on the shielding door 4. Then, a specialized drilling tool is used to drill the operating through-hole 41 on the shielding door 4. Finally, a welding tool is used to firmly weld the shielding plate 7 to the designated position on the shielding door 4 to ensure the stability and functionality of the entire operating device.

[0054] S2: Confirm and adjust valve 1 to be fully open or fully closed;

[0055] First, the valve needs to be adjusted to a fully open or fully closed state. This step is crucial because it ensures that subsequent operating devices can accurately identify and locate the valve's specific position when confirming the open / closed status, thereby avoiding operational errors or equipment malfunctions caused by unclear status.

[0056] S3: After assembling the valve adapter 2 and the extension rod 3, install them onto the valve 1;

[0057] After fixing the extension rod 3 to the valve adapter 2 with screws, it is important to note that the screws do not need to be fully tightened; leave them slightly loose to facilitate subsequent debugging. Next, install the connected valve adapter 2 and extension rod 3 onto the valve stem 11 of the valve 1, ensuring that the valve stem 11 is fully inserted into the valve stem groove 34 of the extension rod 3. After confirming the alignment, proceed with the tightening operation. First, tighten the locking screw at the locking hole 22 to ensure its stability. Then, continue tightening the tightening screw at the set hole 21 so that the tightening screw can effectively hold the valve stem 11, thereby ensuring that there is no rotation between the valve stem 11 and the valve adapter 2, guaranteeing the valve's operating accuracy and stability.

[0058] Subsequently, bushing 9 is installed on the shielding door. Bushing 9 is made of graphite copper with a rolled edge design, a material known for its excellent wear resistance and sealing properties. During installation, bushing 9 is first placed in position, then bushing cover 8 is used to press it against the shielding plate 7, ensuring a tight fit. Finally, bushing cover 8 is secured to the shielding plate 7 with screws. Notably, switch markings are specially provided on the bushing cover 8. This design facilitates accurate valve opening and closing operations by operators based on the switch markings, improving work efficiency and operational safety.

[0059] S4: Close the shielding door, insert the operating component 6 and connect it to the extension rod 3, and confirm the connection status;

[0060] First, completely close the shielding door 4. Then, precisely insert the operating component 6 according to the specific orientation of the groove 32 on the extension rod 3. During this process, special attention must be paid to ensuring that the protrusion 64 on the operating component 6 engages with the groove 32, ensuring a stable and reliable connection between the operating component 6 and the extension rod 3. Subsequently, the operator manually rotates the operating component 6 to carefully check and confirm whether the valve can be smoothly opened and closed by the operating component 6.

[0061] Furthermore, depending on the actual opening state of the valve, whether it is fully open or closed, it is necessary to carefully verify the consistency between the switch markings and the actual opening or closing state of the valve. If a discrepancy is found between the switch markings and the actual opening / closing state of the valve during the verification process, appropriate adjustment measures need to be taken. Specifically, this can be achieved by changing the installation direction of the valve adapter 2 or adjusting the installation direction of the bushing gland 8 until the switch markings are completely consistent with the actual opening / closing state of the valve, thereby ensuring the accuracy and safety of operation.

[0062] S5: Control the opening and closing of valve 1 by rotating the extension rod 3 through the operating component 6. After confirming that there is no problem with the opening and closing of the valve, put valve 1 in the open state.

[0063] The opening and closing of valve 1 is controlled by rotating the extension rod 3 using the operating component 6. After a series of meticulous and repeated tests, it was ensured that the operating component 6 operated without any abnormalities or malfunctions during valve control. Once it was confirmed that the operating component 6 could accurately control the valve's opening and closing, valve 1 was finally adjusted and maintained in the open state to ensure the normal operation and flow of the system.

[0064] S6: Remove operating component 6 and install shielding plug 10.

[0065] First, remove the operating component 6 and place it in the pre-designated position. Then, use the fixing screws to secure the shielding plug 10 to the bushing cover 8. The shielding plug 10 effectively shields radioactive materials, preventing them from being accidentally released through the operating through-hole, thereby ensuring the safety of the environment outside the shielding door 4.

[0066] When valve closure is required, first remove the shielding plug 10. Then, insert the operating component 6 into the appropriate position and adjust its position to ensure that its protrusion 64 and groove 32 engage precisely. After engagement, smoothly and forcefully turn the handle 62 in the direction indicated by the switch markings until the valve is completely closed. After the operation is complete, gently pull out the operating component 6, double-check to ensure everything is correct, and then reinstall the shielding plug 10 in its original position, ensuring it is securely fixed and continues to provide shielding, thus ensuring a safe operating environment.

[0067] The advantages of this invention are as follows: The clamp-type valve adapter ensures a more secure fixation between the valve extension rod and the valve stem, preventing stem sagging and guaranteeing valve stability and reliability. Furthermore, the adapter easily adapts to valve stems of various specifications, eliminating the need for custom valves. This facilitates the addition of the adapter to existing valves and reduces the additional costs associated with valve customization. The extension rod has a groove at its outer end, while the operating rod has a matching protrusion at its inner end. During operation, the groove and protrusion engage easily and precisely, allowing for easy opening of valves with higher torque. The valve extension rod can be kept as short as possible, reducing weight and pressure on the valve stem, thus extending valve lifespan and lowering maintenance costs. The operating component is highly versatile; a single, longer component can accommodate various valve extension rods of different lengths, offering wide applicability. It eliminates the need for a separate operating component for each valve, significantly reducing the overall cost of the operating device. The extension rod's placement within the shielding door does not affect the door's opening and closing function, nor does the door's operation impact the operating device's functionality. By incorporating a limiting structure on the operating rod and a limiting part on the bushing gland, the operating rod can rotate stably and precisely within a 90-degree opening and closing range. This ensures more accurate and reliable valve opening and closing operations, and the structure is simple and robust. The valve operating device provided by this invention, specifically designed for nuclear power plants, employs a relatively short extension rod design. This not only effectively reduces the pressure on the valve stem and improves the valve's service life, but also ensures that the normal opening and closing function of the shielding door is not affected. This helps reduce the radiation risks that technicians may face during operation, providing strong protection for the safe operation of nuclear power plants.

[0068] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A valve operating device for a nuclear power plant, comprising a valve (1) disposed within a shielding door (4), the shielding door (4) having an operating through hole (41), the valve stem (11) of the valve (1) being connected axially to one end of an extension rod (3), characterized in that, The valve stem (11) and the extension rod (3) are connected by a valve adapter (2). The operating component (6) passes through the operating through hole (41) and is detachably connected to the other end of the extension rod (3) inside the shielding door (4). The operating component (6) drives the extension rod (3) to rotate to realize the opening and closing of the valve (1). A shielding plate (7) is provided on the outside of the shielding door (4). A shielding plug (10) for sealing the operating through hole (41) is detachably connected to the shielding plate (7). The valve adapter includes a first clamp (23) and a second clamp (24), wherein the first clamp (23) and the second clamp (24) are closed relative to each other and together clamp the valve stem (11).

2. The valve operating device for a nuclear power plant according to claim 1, characterized in that, The first clamping block (23) and the second clamping block (24) are each provided with a set hole (21) and a locking hole (22). The set screw passes through the set hole (21) and presses against the valve stem (11). The locking screw passes through the locking hole (22) to connect and lock the first clamping block (23) and the second clamping block (24).

3. The valve operating device for a nuclear power plant according to claim 1, characterized in that, The extension rod (3) has a groove (32) at its outer end, and a guide (33) is provided at the outer end of the groove (32). The operating component (6) has a protrusion (64) that matches the groove (32). The guide (33) guides the protrusion (64) to be inserted into the groove (32).

4. The valve operating device for a nuclear power plant according to claim 3, characterized in that, The operating component (6) includes an operating lever (61) connected to the extension rod (3), a handle (62) is provided on the operating lever (61), and the protrusion (64) is provided at the inner end of the operating lever (61).

5. The valve operating device for a nuclear power plant according to claim 4, characterized in that, The operating lever (61) is provided with a limit structure (63).

6. The valve operating device for a nuclear power plant according to claim 5, characterized in that, The shielding plate (7) is provided with a bushing cover (8), and the bushing cover (8) is provided with a limiting part (81). The limiting structure (63) is connected to the limiting part (81).

7. The valve operating device for a nuclear power plant according to claim 6, characterized in that, The outer surface of the bushing cover (8) is provided with a switch mark (82), which is used to indicate the opening and closing direction of the operating component (6) operating valve (1).

8. The valve operating device for a nuclear power plant according to claim 6, characterized in that, A bushing (9) is provided between the operating component (6) and the shielding plate (7), and the bushing (9) is pressed against the shielding plate (7) by the bushing cover (8).

9. A method for installing a valve operating device in a nuclear power plant according to any one of claims 1-8, characterized in that, Includes the following steps; Based on the position of the valve (1), locate the position of the operation through hole (41) and the shielding plate (7) on the shielding door (4), and open the operation through hole (41) and weld the shielding plate (7) according to the positioning. Confirm and adjust valve (1) to be fully open or fully closed; After assembling the valve adapter (2) and the extension rod (3), install them onto the valve (1); Close the shielding door, insert the operating component (6) and connect it to the extension rod (3), and confirm the connection status; The valve (1) is opened and closed by rotating the extension rod (3) driven by the operating component (6). After confirming that there is no problem with the opening and closing of the valve, the valve (1) is put into the open state. Remove the operating component (6) and install the shielding plug (10).

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