A nuclear fuel transfer pipe valve tightness test device

Abstract

The utility model discloses a kind of nuclear fuel transmission pipeline valve tightness test device, nuclear fuel transmission pipeline valve tightness test device includes first plate piece, second plate piece, multiple limit pieces and drive structure. First plate piece cover is located in flange edge and is used to block pipe mouth. Second plate piece is movably connected in first plate piece, multiple limit pieces are arranged along the circumferential direction of pipeline interval, and are used to connect second plate piece and first plate piece in flange edge. Limit piece has the opening of pipeline one side, the opening is used to accommodate second plate piece, first plate piece and flange edge, and the both ends of limit piece are connected with second plate piece and flange edge respectively. Drive structure is connected with second plate piece, and is used to drive first plate piece to move towards the direction of flange edge, to make first plate piece block pipe mouth. The present application can ensure the sealing strength of pipe mouth in the process of pipeline sealing test, and operation is more rapid and convenient, effectively improve the efficiency of pipeline sealing test.

Description

Technical Field

[0001] This utility model relates to the field of nuclear power technology, and in particular to a valve sealing test device for nuclear fuel transmission pipelines. Background Technology

[0002] Due to the high industrial safety and radiation risks associated with nuclear fuel transmission pipelines, extremely high sealing standards are required. Failure to properly seal the pipelines will directly impact upstream units. Sealing of fuel transmission channels at multiple sites has always been a challenging issue. If valves fail to seal, it will affect the reinstallation of the pressure boundary blind flange of the nuclear island containment vessel after refueling during an overhaul, thus impacting the operation of upstream units. Furthermore, for operations requiring pipeline sealing tests at the bottom of the component pool, environmental conditions are high, and there is no corresponding testing equipment. Performing fuel transmission channel sealing tests during the unit's downlink phase of a refueling overhaul is risky. If testing equipment or procedures fail, requiring repeated testing and maintenance, it will delay the critical path of the overhaul, leading to significant leaks of high-radiation, high-dose fuel, posing a high risk and resulting in substantial losses. Utility Model Content

[0003] The main purpose of this invention is to propose a valve sealing test device for nuclear fuel transmission pipelines, aiming to solve the technical problem of how to ensure the sealing effect of pipeline tests while improving test efficiency.

[0004] To achieve the above objectives, this utility model proposes a valve sealing performance testing device for nuclear fuel transmission pipelines, suitable for pipeline sealing performance testing. The pipeline has a pipe opening and a flange located around the pipe opening. The nuclear fuel transmission pipeline valve sealing performance testing device includes:

[0005] The first plate is used to cover the flange edge and to seal the pipe opening;

[0006] The second plate is movably connected to the side of the first plate opposite to the pipe opening;

[0007] Multiple limiting members are provided, spaced apart circumferentially along the pipe, and used to connect the second plate and the first plate to the flange edge. Each limiting member has an opening facing the pipe side, which is used to accommodate the second plate, the first plate and the flange edge. Both ends of the limiting member are used to connect to the second plate and the flange edge, respectively.

[0008] A driving structure is connected to the second plate and is used to drive the first plate to move toward the flange edge so that the first plate blocks the pipe opening. One end of the limiting member is connected to the second plate and the other end of the limiting member is connected to the flange edge.

[0009] In some embodiments, the limiting member includes a first claw, a connecting portion, and a second claw. The first claw and the second claw are respectively connected to both ends of the connecting portion and protrude relative to the same side of the connecting portion to form the opening. The first claw is connected to the side of the flange opposite to the first plate, and the second claw is connected to the side of the second plate opposite to the first plate.

[0010] In some embodiments, the second claw is rotatably connected to the connecting portion; and / or, the first claw is rotatably connected to the connecting portion.

[0011] In some embodiments, the drive structure includes a threaded fastener, the second plate has a threaded hole, the first plate has an abutment hole, the threaded fastener is threadedly connected to the threaded hole, and one end abuts against the abutment hole.

[0012] In some embodiments, the drive structure includes a threaded fastener having a first threaded segment and a second threaded segment with opposite directions of rotation. The first plate has a first threaded hole, and the second plate has a second threaded hole. The first threaded segment is threaded into the first threaded hole, and the second threaded segment is threaded into the second threaded hole.

[0013] In some embodiments, a plurality of driving structures are provided, and the plurality of driving structures are arranged at intervals along the circumferential direction of the second plate.

[0014] In some embodiments, each of the limiting members is fixedly connected to the second plate;

[0015] or,

[0016] Some of the limiting members are fixedly connected to the second plate, while others are detachably connected to the second plate.

[0017] or,

[0018] Each of the aforementioned limiting members can be detachably connected to the second plate.

[0019] In some embodiments, the nuclear fuel transmission pipeline valve sealing test apparatus further includes:

[0020] A pressure testing connector passes sequentially through the second plate and the first plate, and connects to the pipeline. The pressure testing connector is used to introduce pressure testing medium into the pipeline.

[0021] In some embodiments, one end of the pressure fitting is slidably connected to the second plate along the axial direction of the second plate, and the other end of the pressure fitting is connected to the first plate.

[0022] In some embodiments, the nuclear fuel transmission pipeline valve sealing test apparatus further includes:

[0023] A hoisting structure for connecting hoisting equipment, the hoisting structure including a receiving part and a mounting part, one end of the receiving part being connected to the second plate, and the other end of the receiving part being connected to the mounting part, the mounting part being used to connect with the hoisting equipment.

[0024] Compared with the prior art, the beneficial effects of this utility model are:

[0025] In the technical solution of this utility model, the first plate, the second plate, and the flange edge are all accommodated in the opening of the limiting member. The driving structure is connected to the first plate and the second plate and is used to drive the first plate and the second plate to move in opposite directions, so that the first plate moves towards the flange edge and adheres to the flange edge to seal the pipe opening. At this time, one end of the limiting member abuts against the side of the second plate away from the first plate, and the other end of the limiting member abuts against the side of the flange edge away from the first plate, so that the first plate can be tightly attached to the flange edge, thereby achieving effective sealing of the pipe opening. In addition, the driving structure can also drive the first plate and the second plate to move towards each other, reducing the distance between the first plate and the second plate, and disengaging the second plate from the limiting member, so that the first plate can be separated from the flange edge, thereby opening the pipe opening. Compared to related technologies that use screws to fasten the sealing plate to the pipe flange, this application ensures the sealing strength of the pipe opening during the pipe sealing test while avoiding damage to the flange edge from the screws. Furthermore, this application uses a drive structure to move the first and second plates to achieve sealing and opening of the pipe opening, making the operation faster and more convenient, effectively improving the efficiency of the pipe sealing test. In addition, the limiting component provides a continuous and stable force, allowing the first plate to adhere tightly to the flange edge, thereby ensuring the effectiveness of the seal. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0027] Figure 1 This is a first-view view of the structure of the nuclear fuel transmission pipeline valve sealing test device and the pipeline after assembly in one embodiment of the present invention;

[0028] Figure 2 This is an exploded view of the structure of the nuclear fuel transmission pipeline valve sealing test device and pipeline in one embodiment of the present invention;

[0029] Figure 3 This is a second-view view of the structure of the nuclear fuel transmission pipeline valve sealing test device and the pipeline after assembly in one embodiment of this utility model;

[0030] Figure 4 In one embodiment of this utility model, the structure of the nuclear fuel transmission pipeline valve sealing test device and the assembled pipeline follows the... Figure 3 A sectional view cut along the AA direction;

[0031] Figure 5 In one embodiment of this utility model, the structure of the nuclear fuel transmission pipeline valve sealing test device after assembly with the pipeline is shown. Figure 4 A magnified view of a portion of point B in the middle;

[0032] Figure 6 A schematic diagram of a nuclear fuel transmission pipeline valve sealing test device;

[0033] Figure 7 This is a schematic diagram illustrating the reason for the failure of the pipeline pressure test in one embodiment of the present invention; corresponding solutions are provided for each reason.

[0034] Explanation of icon numbers:

[0035] Nuclear fuel transmission pipeline valve sealing test apparatus 100;

[0036] First plate 110; Seal 111;

[0037] Second plate 120;

[0038] Limiting member 130; first claw 131; connecting part 132; second claw 133; opening 134; first limiting member 135; second limiting member 136; third limiting member 137; fourth limiting member 138;

[0039] Drive structure 140; threaded fastener 141;

[0040] Pressure testing connector 150; First connector 151; Second connector 152;

[0041] Lifting structure 160; Supporting part 161; Mounting part 162;

[0042] Pipe 200; pipe opening 210; flange edge 220.

[0043] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0044] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0045] Nuclear fuel is highly radioactive, and its leakage or theft would pose a significant threat to the environment and human health. Constructing pipelines underwater offers several advantages. The relatively enclosed underwater environment reduces the impact of external factors such as earthquakes and explosions. It also increases physical barriers against potential sabotage, enhancing safety. Furthermore, underwater pipelines reduce the risk of accidents caused by human error. Underwater pipelines minimize damage to the surface environment, protecting the ecosystem. Additionally, they avoid intersections with surface transportation infrastructure (such as railways and highways), minimizing traffic disruption.

[0046] Due to the long-term operational requirements of nuclear fuel delivery pipelines, the stability of their long-term sealing performance must be considered. This typically necessitates a sealing test that simulates various operating conditions and environmental factors during long-term operation to assess whether the pipeline's sealing performance meets the requirements. Underwater sealing technology is crucial for achieving pipeline sealing tests. However, due to the complexity of the underwater environment and the special nature of the pipeline materials, underwater pipeline sealing for sealing tests is extremely difficult. The complexity of the underwater environment renders most available equipment ineffective, requiring significant manpower for underwater work. This results in extremely high costs for labor and materials (oxygen, waterproof clothing, radiation protection equipment, etc. for personnel), low testing efficiency, and a high level of danger.

[0047] In view of this, please refer to Figures 1 to 6 The first aspect of this utility model provides a nuclear fuel transmission pipeline valve sealing test apparatus 100, which can seal the pipe opening 210 of the pipeline 200 to facilitate a sealing test of the pipeline 200. The pipeline 200 has a pipe opening 210 and a flange edge 220 disposed around the pipe opening 210. It is understood that the pipeline 200 includes a pipe body for transmitting nuclear fuel and a valve connected to the pipe body; therefore, the sealing test of the pipeline 200 includes testing both the pipe body and the valve.

[0048] Reference Figures 1 to 3The nuclear fuel transmission pipeline valve sealing test device 100 includes a first plate 110, a second plate 120, multiple limiting members 130, and a drive structure 140. The first plate 110 is detachably connected to a flange edge 220 so that it can cover the pipe opening 210, thereby sealing the pipe opening 210. The second plate 120 is movably connected to the side of the first plate 110 opposite to the pipe opening 210. The drive structure 140 is connected to the second plate 120 and can drive the first plate 110 towards the flange edge 220, so that the first plate 110 is tightly against the flange edge 220, achieving a seal at the pipe opening 210. Furthermore, multiple limiting members 130 are spaced apart circumferentially along the pipeline 200, each limiting member 130 having an opening 134 facing one side of the pipeline 200, which can accommodate the edges of the first plate 110, the second plate 120, and the flange edge 220. Specifically, each limiting member 130 has its two ends connected to the second plate 120 and the flange edge 220, respectively. The first plate 110 is located between the second plate 120 and the flange edge 220, and can be adjusted by the drive structure 140 to achieve a tight fit between the first plate 110 and the flange edge 220, thereby effectively sealing the pipe opening 210 and ensuring the accuracy and safety of the test. The arrangement of multiple limiting members 130 spaced circumferentially along the pipe 200 ensures uniform force distribution across all parts, preventing seal failure due to localized stress concentration. This ensures that components such as the first plate 110, the second plate 120, and the flange edge 220 maintain stable positions during the test, preventing seal failure due to displacement.

[0049] Compared to the method of fixing the sealing plate to the flange edge of the pipe with bolts to achieve sealing in related technologies, in this application, the first plate 110, the second plate 120, and the flange edge 220 are all accommodated in the opening 134 of the limiting member 130. The driving structure 140 is connected to the first plate 110 and the second plate 120 and is used to drive the first plate 110 and the second plate 120 to move in opposite directions, so that the first plate 110 moves towards the flange edge 220 and attaches to the flange edge 220 to block the pipe opening 210. At this time, one end of the limiting member 130 abuts against the side of the second plate 120 away from the first plate 110, and the other end of the limiting member 130 abuts against the side of the flange edge 220 away from the first plate 110, so that the first plate 110 can be tightly attached to the flange edge 220, thereby achieving effective sealing of the pipe opening 210. That is, the nozzle 210 achieves a tight seal under the combined action of the limiting member 130 and the driving structure 140, ensuring no leakage risk during the test and improving the overall reliability and stability of the test. In addition, the driving structure 140 can also drive the first plate 110 and the second plate 120 to move towards each other, reducing the distance between the first plate 110 and the second plate 120, and disengaging the second plate 120 from the limiting member 130, so that the first plate 110 can separate from the flange edge 220, thereby opening the nozzle 210.

[0050] Furthermore, compared to related technologies, this application eliminates the need for repeated screwing in and out of the flange edge 220, effectively saving test preparation time. The limiting member 130 allows for quick disassembly and installation of the first plate 110, improving work efficiency. It also effectively protects the flange edge 220 from damage, preventing wear on structures located on the flange edge 220 (including but not limited to threaded holes), ensuring the normal use of the pipeline 200 after testing and extending the equipment's service life. Moreover, in this application, the sealing and opening of the pipe opening 210 is achieved by driving the movement of the first plate 110 and the second plate 120 through the drive structure 140, making operation faster and more convenient, effectively improving the efficiency of the pipeline 200 sealing test. In addition, the limiting member 130 provides a continuous and stable force, allowing the first plate 110 to adhere tightly to the flange edge 220, thereby ensuring the effectiveness of the seal.

[0051] Specifically, the first plate 110 is placed over the pipe opening of the pipe 200 and is detachably connected to the flange edge 220; the second plate 120 is movably connected to the side of the first plate 110 away from the pipe opening 210, and the first plate 110 and the second plate 120 are movably connected, so that the first plate 110 and the second plate 120 can move relative to each other.

[0052] Multiple limiting members 130 are spaced apart circumferentially along the pipe 200 and are used to connect the second plate 120 and the first plate 110 to the flange edge 220. In some embodiments, the limiting member 130 includes a first claw 131, a connecting portion 132, and a second claw 133. The first claw 131 and the second claw 133 are respectively connected to both ends of the connecting portion 132 and protrude from the same side of the connecting portion 132. The connecting portion 132 is disposed on the periphery of the second plate 120 and the first plate 110. The first claw 131 is disposed on the side of the second plate 120 opposite to the first plate 110 and is detachably connected to the second plate 120. The second claw 133 is disposed on the side of the flange edge 220 opposite to the first plate 110 and is detachably connected to the flange edge 220.

[0053] The drive structure 140 is connected to the first plate 110 and the second plate 120, and is used to drive the second plate 120 to move toward or away from the first plate 110. When the drive structure 140 drives the first plate 110 and the second plate 120 to move in opposite directions, the first plate 110 can adhere to the flange edge 220 and seal the pipe opening 210. It should be noted that when the first plate 110 abuts against the flange edge 220, the drive structure 120 continues to move, causing the second plate 120 to move away from the flange edge 220 under the action of the drive structure 140, until the side of the flange edge 220 away from the first plate 110 abuts against the first claw 131 and the side of the second plate 120 away from the first plate 110 abuts against the second claw 133, thereby ensuring that the first plate 110 is tightly attached to the flange edge 220, thus achieving a good sealing effect on the pipe 200.

[0054] The design of the limiting component 130 ensures that the positions of each component are fixed when pressure is applied, avoiding sealing failure caused by the positional displacement of the first plate 110 and the second plate 120. When it is necessary to remove the nuclear fuel transmission pipeline valve sealing test device 100 from the pipeline 200, it is only necessary to drive the drive structure 140 to move the first plate 110 and the second plate 120 towards each other, so that the first plate 110 is disengaged from the flange edge 220, the first claw 131 is disengaged from the flange edge 220, and the second claw 133 is disengaged from the second plate 120, thereby improving the ease of installation and disassembly of the test device.

[0055] To accommodate flange edges 220 of different sizes, adjustment mechanisms can be provided on the first plate 110 and the second plate 120, allowing fine-tuning of the distance between them to ensure optimal sealing performance.

[0056] Reference Figure 5To further improve the sealing effect between the first plate 110 and the flange edge 220, the first plate 110 is provided with a sealing groove for accommodating the sealing element 111. That is, the sealing element 111 is located between the contact surfaces of the first plate 110 and the flange edge 220. The sealing element 111 can further seal the gap between the first plate 110 and the flange edge 220, thereby improving the sealing effect, ensuring the smooth progress of the test, and ensuring the validity of the test data.

[0057] In some embodiments, the drive structure 140 includes a threaded fastener 141, which includes, but is not limited to, bolts, screws, studs, and other structures with threaded surfaces. The second plate 120 has a threaded hole, and the first plate 110 has an abutment hole. The threaded fastener 141 passes through and is threaded into the threaded hole, with one end abutting against the abutment hole. The abutment hole helps ensure that the threaded fastener 141 and the first plate 110 are in a unique position, preventing the threaded fastener 141 from becoming misaligned relative to the first plate 110 and thus avoiding damage to the threaded fastener 141. Specifically, when sealing the nozzle 210 is required, the second plate 120 is connected to the first plate 110 via a threaded fastener 141. The first plate 110 is then placed against the flange edge 220, with the side of the first claw 131 facing the second claw 133 against the side of the flange edge 220 away from the first plate 110, while the side of the second claw 133 facing the first claw 131 faces the second plate 120. Tightening the threaded fastener 141 further into the threaded hole increases the distance between the first plate 110 and the second plate 120 until the side of the second plate 120 away from the first plate 110 abuts against the second claw 133, thereby achieving a seal on the nozzle 210. Similarly, when it is necessary to release the seal on the pipe opening 210, simply turn the threaded fastener 141 in the opposite direction to reduce the distance between the first plate 110 and the second plate 120, thereby causing the second claw 133 to disengage from the second plate 120 and the first claw 131 to disengage from the flange edge 220. The first plate 110 and the second plate 120 can then be removed from the flange edge 220 as a whole.

[0058] In other embodiments, the drive structure 140 includes a threaded fastener 141, which has a first threaded segment and a second threaded segment with opposite directions of rotation. The first plate 110 has a first threaded hole, and the second plate 120 has a second threaded hole. The first threaded segment is threaded into the first threaded hole, and the second threaded segment is threaded into the second threaded hole. Rotating the threaded fastener 141 can simultaneously drive the first plate 110 and the second plate 120 to move in opposite directions or towards each other, which not only improves operating efficiency but also enhances structural stability. When the threaded fastener 141 is rotated in the forward direction, the first threaded segment and the second threaded segment rotate synchronously with the threaded fastener 141, causing the first plate 110 and the second plate 120 to move in opposite directions, gradually increasing the distance between them, until the side of the second plate 120 away from the first plate 110 abuts against the second claw 133, and the first plate 110 is tightly against the flange edge 220, achieving a tight seal of the pipe opening 210. Similarly, when the threaded fastener 141 is rotated in the opposite direction, the first and second threaded segments rotate synchronously in the opposite direction with the threaded fastener 141, causing the first plate 110 and the second plate 120 to move closer to each other, gradually reducing the distance between them until the first claw 131 disengages from the flange edge 220, and the second plate 120 and the second claw 133 completely separate, thus releasing the seal on the pipe opening 210. The opposite rotation of the first and second threaded segments ensures that the first plate 110 and the second plate 120 move synchronously and in opposite directions during the rotation of the threaded fastener 141, improving the accuracy of sealing and unsealing and the convenience of operation. Through this design, not only is rapid sealing and unsealing of the pipe opening 210 achieved, but also stability and safety during operation are ensured. The opposite rotation design of the threaded fastener 141 effectively avoids the offset or jamming problems that may be caused by a single threaded segment, further improving the overall performance of the device.

[0059] It should be noted that during the sealing process of the pipe opening 210, torque can be applied to each threaded fastener 141 in multiple stages to ensure the sealing effect while reducing damage to the threaded fastener 141, the first plate 110, and the second plate 120. For example, torque is applied to each threaded fastener 141 in two stages: 40 N·m of torque is applied to each threaded fastener 141, followed by 60 N·m of torque applied to each threaded fastener 141.

[0060] In some implementations, to improve adjustment accuracy and convenience, scale markings can be added to the threaded fastener 141 so that the operator can precisely control the distance between the two plates.

[0061] It is understandable that the drive structure 140 can also be a cylinder, hydraulic cylinder, or other structure that can drive the first plate 110 and the second plate 120 to move in opposite directions or towards each other.

[0062] In some embodiments, the drive structure 140 is connected at the center of the second plate 120 and the first plate 110. When the drive structure 140 is connected at the center of the second plate 120 and the first plate 110, uniform force is ensured, allowing the first plate 110 to smoothly adhere to the flange edge 220 and seal the pipe opening 210. This not only simplifies the installation process, but also allows for sealing tests to be performed in a smaller operating space because the force is concentrated at the center.

[0063] Please see Figure 3 and Figure 4 In other embodiments, multiple drive structures 140 are provided, arranged at intervals along the circumference of the second plate 120 and connected to the edges of the first plate 110 and the second plate 120. This multi-point drive design ensures even force distribution at each point, preventing poor sealing due to excessive localized force. Furthermore, since each drive structure 140 is connected to the edges of the first plate 110 and the second plate 120, during the sealing operation of the pipe opening 210, the force exerted by the drive structure 140 on the first plate 110 can be directly transmitted to the flange edge 220, allowing the edge of the first plate 110 to tightly adhere to the flange edge 220. This effectively prevents gaps between the edge of the first plate 110 and the flange edge 220, thereby improving the sealing effect.

[0064] In addition, the design of multiple drive structures 140 arranged circumferentially along the second plate 120 not only increases the rigidity of the overall structure but also allows the spacing between each drive structure 140 to be adjusted according to the specific geometry of the flange edge 220 to ensure optimal sealing performance. Furthermore, multi-point drive can distribute the load on a single drive structure 140, extending its service life. For example, when dealing with large or irregular flange edges 220, increasing the number of drive structures 140 can provide greater clamping force while maintaining good balance. Each drive structure 140 can be independently adjusted to adapt to different operating conditions.

[0065] It should be noted that the number of drive structures 140 can be six, eight, nine, ten, etc.

[0066] In some embodiments, the second claw 133 is rotatably connected to the connecting portion 132, allowing the second claw 133 to rotate around the connecting portion 132. This facilitates adjustment of the position of the second claw 133 relative to the second plate 120, ensuring a stable connection while facilitating assembly and disassembly. Specifically, the first claw 131 is fixedly connected to the connecting portion 132, providing a stable support point; the second claw 133, through rotational adjustment, achieves flexible docking with the second plate 120, enhancing the adaptability and convenience of the device. It should be noted that the rotation direction of the second claw 133 can be around its connection position with the connecting part 132, moving towards or away from the second plate 120. For ease of understanding, the axis of the connecting part 132 is defined as the first axis, and the axis of the second claw 133 is defined as the second axis. The second claw 133 rotates relative to the connecting part 132 until it can abut against the side of the second plate 120 away from the pipe opening. During this process, the second axis gradually changes from being parallel to or slightly angled to the first axis to being perpendicular to the first axis, ensuring that the second claw 133 is firmly attached to the second plate 120, improving the stability and sealing performance of the overall structure. The rotation direction of the second claw 133 can also be a swinging rotation around its connection position with the connecting part 132 in a plane parallel to the surface of the second plate 120.

[0067] In other words, the second claw 133 is rotatably connected to the connecting part 132 so that, in the arrangement direction of the first plate 110 and the second plate 120, the second claw 133 is staggered from the second plate 120, or the second claw 133 is stacked with the second plate 120. Specifically, when assembling the limiting member 130 with the flange edge 220, since the second claw 133 is staggered from the second plate 120, the first plate 110 and the second plate 120 can move towards the flange edge 220 without considering the interference of the second claw 133 on its installation on the flange edge 220, thereby improving the convenience of assembling the first plate 110, the second plate 120 and the flange edge 220.

[0068] In other embodiments, the first claw 131 is rotatably connected to the connecting portion 132 so that, in the arrangement direction of the first plate 110 and the second plate 120, the first claw 131 is offset from the flange edge 220, or the first claw 131 is stacked with the flange edge 220. This improves the ease of assembly of the first plate 110, the second plate 120, and the flange edge 220, while also enhancing the compatibility of the limiting member 130 with various flange edges 220. For example, when the surface of the flange edge 220 is uneven, the first claw 131 can rotate relative to the connecting portion 132 about an axis parallel to the extension direction of the connecting portion 132, or the first claw 131 can rotate relative to the connecting portion 132 about an axis perpendicular to the extension direction of the connecting portion 132, thereby adjusting the angle of the first claw 131 relative to the connecting portion 132 to achieve a tight fit between the first claw 131 and the flange edge 220, thereby achieving an effective seal between the first plate 110 and the flange edge 220, and thus enhancing the sealing effect.

[0069] In some other embodiments, both the first claw 131 and the second claw 133 are rotatably or slidably connected to the connecting part 132. This further avoids interference from the connecting part 132 during the assembly of the first plate 110 and the second plate 120 onto the flange edge 220, improving assembly convenience while enhancing the compatibility of the limiting member 130 with flange edges 220 and second plate parts 120 of different sizes.

[0070] The rotation methods of the first claw 131 and the second claw 133 can be the same or different. In some embodiments, the connection method between the first claw 131 and the connecting part 132 includes, but is not limited to, hinges or other connection methods that allow the first claw 131 to rotate relative to the connecting part 132. Similarly, the connection method between the second claw 133 and the connecting part 132 includes, but is not limited to, hinges or other connection methods that allow the second claw 133 to rotate relative to the connecting part 132. In other embodiments, the connection method between the first claw 131, the second claw 133 and the connecting part 132 can also be an integral molding connection. That is, the first claw 131, the second claw 133 and the connecting part 132 can be formed by methods including, but not limited to, integral casting, injection molding and machining, so that the first claw 131 and the connecting part 132, and the second claw 133 and the connecting part 132 form a seamless connection, further improving the structural strength and stability, and ensuring that efficient sealing performance can still be maintained in complex installation environments. It is understood that the first claw 131, the second claw 133 and the connecting part 132 can also be connected by welding or other methods.

[0071] Understandably, a locking mechanism could also be designed to fix the first claw 131 and / or the second claw 133 in place once they are adjusted to the appropriate position, preventing accidental movement during use. For applications with a high degree of automation, a motor-driven automatic adjustment system could be introduced, combined with sensor feedback, to achieve precise control and improve work efficiency and accuracy.

[0072] Multiple limiting elements 130 are fixedly connected to the second plate 120. This design ensures that all limiting elements 130 act synchronously when pressure is applied, providing uniform and stable support force, thereby enhancing the sealing effect between the first plate 110 and the flange edge 220. It should be noted that during the operation of assembling the nuclear fuel transmission pipeline valve sealing test device 100 at the pipe port 210, the relative position of the limiting element 130 and the second connecting plate 120 is uniquely determined, and therefore the limiting element 130 can be considered fixedly connected to the second plate 120. It is understood that the fixed connection method between the limiting element 130 and the second plate 120 includes, but is not limited to, mechanical connection methods such as threaded connection and welding. The limiting element 130 can also be integrally formed with the second plate 120 by injection molding, machining (including but not limited to turning, milling, etc.) to ensure a firm and reliable connection.

[0073] Considering that some limiting members 130 may need to be adjusted or replaced in practical applications to accommodate different flange sizes or shapes, a design can be adopted in which some limiting members 130 are fixedly connected to the second plate 120, while the other part of the limiting members 130 is detachably connected to the second plate 120. This approach not only improves the compatibility of the device with various flange edges 220, but also facilitates maintenance and repair. Specifically, by detachably connecting some limiting members 130 to the second plate 120, and with the first plate 110 close to the pipe opening 210 and located between the second plate 120 and the flange edge 220, the remaining limiting members 130 are installed on one side of the insertion direction of the first plate 110 and the second plate 120, thereby allowing the limiting members 130 to avoid interference during the installation of the first plate 110 and the second plate 120 on the pipeline 200. For example, when facing non-standard flange edges 220 or special working conditions, operators can quickly increase or decrease the number of limiting members 130 or change their positions according to the actual situation to achieve optimal sealing performance.

[0074] Multiple limiting members 130 are detachably connected to the second plate 120. Therefore, the connection position of the limiting member 130 relative to the second plate 120 can be adaptively adjusted according to the environment of the pipeline 200 and the force or shape of the flange edge 220. This provides maximum flexibility, allowing users to customize the device configuration according to specific testing needs, further enhancing the application range and practicality of the equipment. It should be noted that during the assembly of the nuclear fuel transmission pipeline valve sealing test device 100 onto the pipe port 210, the relative position of the limiting member 130 and the second plate 120 can be dynamically adjusted during installation. That is, the limiting member 130 can move flexibly relative to the second plate 120, which means the limiting member 130 can be considered detachably connected to the second plate 120. The detachable connection methods between the limiting member 130 and the second plate 120 include, but are not limited to, surface contact abutment connections.

[0075] Please see Figure 1 , Figure 2 as well as Figure 6 There are four limiting members 130. For ease of description, these limiting members 130 are defined as the first limiting member 135, the second limiting member 136, the third limiting member 137, and the fourth limiting member 138. The first limiting member 135 and the second limiting member 136 are fixedly connected to the second plate 120. The first claw 131, the connecting part 132, and the second claw 133 in the first limiting member 135 define a first opening. The first claw 131, the connecting part 132, and the second claw 133 in the second limiting member 136 define a second opening. The third limiting member 137 and the fourth limiting member 138 are fixedly connected to the flange edge 220. The first claw 131, the connecting part 132, and the second claw 133 in the third limiting member 137 define a third opening. The first claw 131, the connecting part 132, and the second claw 133 in the fourth limiting member 138 define a fourth opening. The first opening and the third opening face each other, and the second opening and the fourth opening face each other. This effectively improves the ease of assembling the first plate 110 and the second plate 120 onto the flange edge 220.

[0076] Specifically, when sealing the pipe opening 210 is required, the first and third openings are positioned facing each other, and the second and fourth openings are positioned facing each other. The first and second limiting members 135 and 136 are gradually moved closer to the third and fourth limiting members 137 and 138, until the flange edge 220 is inserted into the first and second openings, and the second plate 120 is inserted into the third and fourth openings. This ensures that the first and second limiting members 135 and 136 are connected to the flange edge 220, and the third and fourth limiting members 137 and 138 are connected to the second plate 120. In other words, the relative arrangement of the first and third openings, and the relative arrangement of the second and fourth openings, helps to avoid overlap during the installation of the first and second plate 110 and 120, thereby improving installation convenience, ensuring tight contact of the sealing surfaces, and improving sealing efficiency.

[0077] Please see Figure 1 and Figure 4 The nuclear fuel transmission pipeline valve sealing test apparatus 100 also includes a pressure testing connector 150, which is at least connected to the first plate 110 and communicates with the pipeline 200. It can be used to introduce pressure testing medium into the pipeline 200. In some embodiments, the pressure testing connector 150 passes sequentially through the second plate 120 and the first plate 110, and communicates with the pipeline 200. It should be noted that by directly connecting the pressure testing connector 150 to the first plate 110 and ensuring its communication with the interior of the pipeline 200, pressure control within the enclosed space can be achieved. When the first plate 110 is abutted against the flange edge 220 and the pipe opening 210 is sealed, the pressure testing connector 150 becomes a channel for injecting liquid or gas (such as water, air, or other suitable media) into this enclosed system. Thus, operators can conveniently perform sealing tests without damaging the original pipeline 200 structure, while ensuring the safety and effectiveness of the pressure testing process.

[0078] To improve the connection strength and sealing performance between the pressure fitting 150 and the first plate 110, an additional sealing gasket or threaded connection can be used between them. Furthermore, considering that different types of pipes 200 may require different pressure-pressurizing media, the pressure fitting 150 can be designed as a replaceable or adjustable type to adapt to various testing requirements. For example, for high-pressure testing, a material with higher pressure resistance can be selected to manufacture the pressure fitting 150; for corrosive media, a material with corrosion-resistant properties should be selected. Such a design not only enhances the functional versatility of the equipment but also improves the overall system reliability and service life.

[0079] One end of the pressure fitting 150 is slidably connected to the second plate 120 along the axial direction of the second plate 120, and the other end is connected to the first plate 110 and communicates with the pipeline 200. This sliding connection design ensures smooth passage of the pressure-pressurizing medium while preventing interference between the pressure fitting 150 and the drive structure 140 in moving the first plate 110 and the second plate 120. In other words, the second plate 120 can slide relative to the pressure-pressurizing structure, thus protecting the connection between the pressure fitting 150 and the first plate 110 and preventing adverse effects from external structures.

[0080] The pressure testing connector 150 can integrate monitoring elements such as pressure sensors to provide real-time feedback on the pressure testing status to the control system, thereby achieving a higher degree of automation in sealing tests.

[0081] In some embodiments, the pressure testing connector 150 includes a first connector 151 and a second connector 152. The first connector 151 is used to introduce pressurized gas into the pipeline 200 to facilitate testing the pressure resistance of the pipeline 200. The second connector 152 is used to introduce leak detection liquid (tracer liquid) into the pipeline 200, which helps to quickly identify leaks in the pipeline 200.

[0082] The nuclear fuel transmission pipeline valve sealing test apparatus 100 also includes a hoisting structure 160, please refer to [link / reference]. Figure 6 The hoisting structure 160 includes a receiving portion 161 and a mounting portion 162. One end of the receiving portion 161 is connected to the second plate 120, and the other end is connected to the mounting portion 162. The mounting portion 162 is used to connect hoisting equipment (including but not limited to cranes, elevators, etc.). In some embodiments, the receiving portion 161 may also be connected to the first plate 110. The mounting portion 162 may be a hole structure or other structure capable of connecting hoisting equipment.

[0083] The entire sealing test apparatus can be easily transported to the designated location via the lifting structure 160, ensuring precise alignment of the flange edge 220 and pipe port 210 during installation. The receiving section 161 is designed for a secure connection with the second plate 120 to bear the weight of the entire apparatus and its additional load. The mounting section 162 provides an interface with external lifting equipment, ensuring safety and stability during lifting. This structure not only simplifies the handling of large or heavy equipment but also improves the safety factor of on-site operations.

[0084] To accommodate testing devices of different sizes and weights, an adjustable-length connecting rod can be added between the receiving part 161 and the mounting part 162, allowing the lifting structure 160 to flexibly handle various height requirements. Furthermore, multiple safety locking mechanisms can be installed in the mounting part 162 to prevent accidental detachment during lifting.

[0085] For ease of understanding, the working principle of the experimental apparatus 100 is as follows:

[0086] First, the test device 100 is connected to the hoisting equipment via the hoisting structure 160. Driven by the hoisting equipment, the test device 100 is transported to the test position on the pipeline 200, with the first plate 110 facing the pipe opening 210. Then, the opening 134 of the limiting member 130 is fitted onto the outside of the flange edge 220 and the second plate 120, i.e., the first claw 131 is located on the side of the flange edge 220 away from the first plate 110, and the second claw 133 is located on the side of the second plate 120 away from the flange edge 220. Next, the threaded fastener 141 is rotated forward, and the first plate 110 and the second plate 120 move away from each other, with the distance between them gradually increasing until the side of the first claw 131 facing the second claw 133 is pressed against the side of the flange edge 220 away from the first plate 110, and the side of the second claw 133 facing the first claw 131 is pressed against the side of the second plate 120 away from the flange edge 220. At this point, the pipe opening 210 is sealed by the support of the first plate 110. The lifting equipment can then be separated from the lifting structure 160. Pressurized gas is then introduced into the pipe 200 through the first connector 151, and the internal pressure of the pipe 200 is monitored. If the internal pressure drops rapidly within a short period, inspection liquid can be introduced into the pipe 200 through the second connector 152. If there is a leak in the pipe 200, the inspection liquid will seep out through the leak and display a special color, facilitating detection.

[0087] After the test is completed, the threaded fastener 141 is rotated in the reverse direction, causing the first plate 110 and the second plate 120 to move closer to each other, gradually reducing the distance between them. The clamping force between the first claw 131 and the second claw 133 gradually weakens until they are completely disengaged from the flange edge 220 and the second plate 120. Finally, the test device 100 is removed from the test position on the pipeline 200 using hoisting equipment and transported back to its initial position for maintenance or the next test.

[0088] Please see Figure 7 The second aspect of this utility model also provides a test method applicable to conducting a pipeline 200 sealing test using a nuclear fuel transmission pipeline valve sealing test apparatus 100 described in any of the above embodiments. The test method includes:

[0089] S101: Place the second plate 120, the first plate 110 and the flange edge 220 between the first claw 131 and the second claw 133;

[0090] S102: The drive structure 140 controls the second plate 120 to move away from the first plate 110 until the side of the first plate 110 away from the second plate 120 abuts against the flange edge 220, the side of the first claw 131 facing the second claw 133 abuts against the side of the flange edge 220 away from the first plate 110, and the side of the second plate 120 away from the first plate 110 abuts against the side of the second claw 133 facing the first claw 131.

[0091] S103: Perform a sealing test on pipe 200.

[0092] By using the nuclear fuel transmission pipeline valve sealing test device 100 provided in this application to seal the pipeline 200 and to test the pipeline 200 using the test method provided in this application, the workload of underwater assembly tools can be reduced, the number of personnel going underwater can be reduced, and the risk of accidental equipment contact can be lowered.

[0093] Specifically, the second plate 120, the first plate 110, and the flange edge 220 are first placed between the first claw 131 and the second claw 133. This arrangement ensures that when the drive structure 140 is activated, the first plate 110 can accurately attach to the flange edge 220 and seal the pipe opening 210. At the same time, the first claw 131 abuts against the side of the flange edge 220 away from the first plate 110, and the second claw 133 abuts against the side of the second plate 120 away from the first plate 110, thereby forming a closed space.

[0094] Next, the drive structure 140 controls the second plate 120 to move away from the first plate 110 until the side of the flange edge 220 away from the first plate 110 is completely abutted against the side of the first claw 131 facing the second claw 133, and simultaneously the side of the second plate 120 away from the first plate 110 is also completely abutted against the side of the second claw 133 facing the first claw 131. This step achieves an effective seal on the nozzle 210, creating conditions for subsequent sealing tests. At this point, because the first claw 131 and the second claw 133 of the limiting member 130 respectively restrict the positions of the flange edge 220 and the second plate 120, even if pressure is applied, it will not affect the already formed sealing surface.

[0095] Finally, the tightness of the pipeline 200 is detected. A pressure test medium (such as gas or liquid) is introduced through the pressure test joint 150, and then a professional instrument is used to monitor the pressure change in the system. If there is no significant pressure drop within the specified time, it indicates that the pipeline 200 has good sealing performance; otherwise, there may be leakage points that need further inspection and repair. This method can directly and efficiently evaluate the sealing state of the pipeline 200, providing an important basis for maintaining the safety of the nuclear fuel transfer system.

[0096] Before the test, the valve connected to the pipe body is first closed, so that the tightness and pressure resistance of the valve can also be tested during the tightness test.

[0097] In some embodiments, the tightness of the pipeline 200 can be detected first to facilitate the subsequent pressure resistance test of the pipeline 200. Specifically, the pressure test joint 150 includes a second joint 152 for introducing a leak detection liquid into the pipeline 200. After the first plate 110 seals the pipe opening 210, the leak detection liquid is introduced into the pipeline 200 through the second joint 152. The pipeline 200 can be provided with a test hole (or a liquid level detection device is provided inside the pipeline 200). When the leak detection liquid flows out of the test hole, the introduction of the leak detection liquid is stopped and the test hole is closed. Then, it is checked whether the leak detection liquid flows out at various parts of the pipeline 200. The leak detection liquid is a color-developing liquid containing multiple components. When it leaks from the leak point of the pipeline 200, it will show a color different from the environment, so that the staff can quickly find the location of the leak point.

[0098] After the tightness of the pipeline 200 is detected, a pressure test gas (including but not limited to compressed air) is introduced into the pipeline 200 through the first joint 151 until the pressure in the pipeline 200 reaches 5.2 bar. If it is found that the pressure in the pipeline 200 drops rapidly, a check liquid can be used to check the sealing condition of the first plate 110. Keep the air pressure in the pipeline 200 for 5 hours and check the pressure change in the pipeline 200. If the leakage volume of the air pressure in the pipeline 200 within 5 hours is not greater than 500 ml, the tightness of the pipeline 200 is qualified. If the volume of the air leakage in the pipeline 200 within 5 hours is greater than 500 ml, it is necessary to recheck the installation of the nuclear fuel transfer pipeline valve tightness test device 100 and the pipeline 200, and then conduct a pressure resistance test.

[0099] After the test is completed, the pipeline 200 is depressurized and exhausted to atmospheric pressure. Remove the test pipeline, disassemble the nuclear fuel transfer pipeline valve tightness test device 100, pack up the tools and other supplies and clean up the site.

[0100] It should be noted that the pressure resistance test of pipeline 200 should be carried out under an air pressure greater than 5 bar (absolute pressure) and maintained at this pressure for a period of time to check its pressure resistance. During the pressure holding process of pipeline 200, a pressure check should be performed every half hour. If the volume of the pressurized medium leaking from pipeline 200 after 5 hours is no more than 500 ml, then the pressure holding pressure inside pipeline 200 is qualified.

[0101] For detecting the air pressure inside pipe 200, a pressure gauge connected to the inside of pipe 200 can be installed. This pressure gauge can be installed on a work platform away from the water tank to avoid frequent underwater operations by workers, reduce collective exposure to water, and improve detection efficiency.

[0102] Before using the test pipeline to guide the pressurizing medium to the pressurizing connector 150, a 2.2 Bar pressure test can be performed on the test pipeline in advance, and the sealing performance can be checked with leak detection fluid.

[0103] The test methods also include:

[0104] The sealing reliability of the nuclear fuel transmission pipeline valve sealing test device 100 is checked. After the test device is installed on the pipeline 200, with the pressure reaching 2.2 bar, a leak detection liquid is used to check for leaks around the circumference of the test device connected to the pipe opening 210. If a leak is found, the position of the test device is adjusted.

[0105] If leakage is still found around the circumference of the test device after multiple adjustments, the test device should be removed and the integrity of the seal 111 of the test device (in some embodiments, the test device is provided with a seal 111 on the side of the first plate 110 away from the second plate 120) should be checked, and the seal 111 of the test device should be replaced if necessary.

[0106] Check the sealing reliability of the connection between the test device and the port 210. With the air pressure reaching 2.2 bar, use leak detection liquid to check for leaks at each connecting pipeline, valve, instrument and joint of the test device. If a leak is found, it can be temporarily sealed with raw rubber tape; if it cannot be sealed, the corresponding leaking structure should be replaced.

[0107] The test methods also include:

[0108] 1) Check and confirm that the valve is completely closed. If it is not completely closed, please have the operator close the valve completely.

[0109] 2) Check for external leaks in the valve seal. With the valve inflated to 2.2 bar, use a leak detection fluid to check for leaks at the connection between the valve and the pipe body. If a leak is found, it indicates that the valve sealing rubber ring is leaking and needs to be replaced.

[0110] 3) Check the valve seal for internal leakage. With the valve inflated to 2.2 bar, first seal the first leak detection port using Teflon tape. Then, use leak detection fluid to check the second leak detection port. If a leak is found, it indicates internal leakage. First, increase the torque of the bolts near the sealing metal ring at the leak point to 200 N·m. It should be noted that valves typically have multiple leak detection ports. By sealing some of these ports and leaving one untreated, the location of the leak can be gradually determined.

[0111] 4) If leakage still occurs after increasing the bolt torque near the sealing metal ring, it indicates that the sealing metal ring is damaged and needs to be replaced.

[0112] To improve the accuracy of sealing tests, pressure sensors or other types of measuring tools can be integrated on the first plate 110 to monitor the internal pressure in real time and transmit the data to a remote terminal via wireless transmission technology to achieve automated monitoring.

[0113] To facilitate the transportation of the valve sealing test device for the transmission pipeline 200, a transport trolley can be provided. Specifically, the transport trolley transports the valve sealing test device for the transmission pipeline 200 to the work platform, and then the hoisting equipment can be used to lift the valve sealing test device for the transmission pipeline 200 to the vicinity of the pipe opening 210, and then assemble it on the flange edge 220.

[0114] In some embodiments, the first plate 110 is also provided with a pressure relief valve to facilitate pressure relief of the pipeline 200 after the sealing test is completed. This also helps to prevent damage to the pipeline 200 due to excessive internal pressure during the sealing test.

[0115] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0116] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or," "and / or," or "and / or" throughout the text implies three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where A and B are simultaneously satisfied. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0117] The above are merely preferred embodiments of this utility model and do not limit the patent scope of this utility model. Any equivalent structural transformations made based on the inventive concept of this utility model and the contents of this utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this utility model.

Claims

1. A valve sealing test apparatus for a nuclear fuel transmission pipeline, suitable for pipeline sealing tests, wherein the pipeline has a pipe opening and a flange disposed around the pipe opening, characterized in that, The nuclear fuel transmission pipeline valve sealing test device includes: The first plate is used to cover the flange edge and to seal the pipe opening; The second plate is movably connected to the side of the first plate opposite to the pipe opening; Multiple limiting members are provided, spaced apart circumferentially along the pipe, and used to connect the second plate and the first plate to the flange edge. Each limiting member has an opening facing the pipe side, the opening being used to receive the second plate, the first plate, and the flange edge. A driving structure is connected to the second plate and is used to drive the first plate to move toward the flange edge so that the first plate blocks the pipe opening. One end of the limiting member is connected to the second plate and the other end of the limiting member is connected to the flange edge.

2. The nuclear fuel transmission pipeline valve sealing test apparatus as described in claim 1, characterized in that, The limiting member includes a first claw, a connecting portion, and a second claw. The first claw and the second claw are respectively connected to both ends of the connecting portion and protrude from the same side of the connecting portion to form the opening. The first claw is connected to the side of the flange opposite to the first plate, and the second claw is connected to the side of the second plate opposite to the first plate.

3. The nuclear fuel transmission pipeline valve sealing test apparatus as described in claim 2, characterized in that, The second claw is rotatably connected to the connecting portion; and / or, the first claw is rotatably connected to the connecting portion.

4. The nuclear fuel transmission pipeline valve sealing test apparatus as described in any one of claims 1 to 3, characterized in that, The drive structure includes a threaded fastener, the second plate has a threaded hole, the first plate has an abutment hole, the threaded fastener is threaded into the threaded hole, and one end abuts into the abutment hole.

5. The nuclear fuel transmission pipeline valve sealing test apparatus as described in any one of claims 1 to 3, characterized in that, The drive structure includes a threaded fastener having a first threaded segment and a second threaded segment with opposite directions of rotation. The first plate has a first threaded hole, and the second plate has a second threaded hole. The first threaded segment is threaded into the first threaded hole, and the second threaded segment is threaded into the second threaded hole.

6. The nuclear fuel transmission pipeline valve sealing test apparatus as described in any one of claims 1 to 3, characterized in that, The driving structure is provided in multiple ways, and the multiple driving structures are arranged at intervals along the circumference of the second plate.

7. The nuclear fuel transmission pipeline valve sealing test apparatus as described in any one of claims 1 to 3, characterized in that, Each of the aforementioned limiting components is fixedly connected to the second plate; or, Some of the limiting members are fixedly connected to the second plate, while others are detachably connected to the second plate. or, Each of the aforementioned limiting members can be detachably connected to the second plate.

8. The nuclear fuel transfer pipe valve tightness testing apparatus according to claim 1, wherein The test apparatus also includes: A pressure testing connector passes sequentially through the second plate and the first plate, and connects to the pipeline. The pressure testing connector is used to introduce pressure testing medium into the pipeline.

9. The nuclear fuel transmission pipeline valve sealing test apparatus as described in claim 8, characterized in that, One end of the pressure fitting is slidably connected to the second plate along the axial direction of the second plate, and the other end of the pressure fitting is connected to the first plate.

10. The nuclear fuel transfer pipe valve tightness testing apparatus according to claim 1, wherein The test apparatus also includes: A hoisting structure for connecting hoisting equipment, the hoisting structure including a receiving part and a mounting part, one end of the receiving part being connected to the second plate, and the other end of the receiving part being connected to the mounting part, the mounting part being used to connect with the hoisting equipment.

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