A power plant gate valve on-line sealing test tool

Abstract

The utility model discloses a power plant gate valve on -line sealing test tool relates to gate valve sealing test tool technical field, the utility model discloses a pump body, its export place is connected with the sealing cover through the pipeline, is equipped with the sealing groove of pipeline intercommunication on the sealing cover, the sealing groove can be set in the test interface of gate valve, and form the sealed cavity of pipeline intercommunication, the sealing pad is fixedly installed to the sealing cover bottom, and the both sides of sealing cover are oppositely equipped with two groups of clamping assembly for fixing sealing cover on gate valve, pressure sensor, its intercommunication is between the pipeline and pump body. The utility model discloses through the cooperation of clamping assembly and sealing cover, need not to dismantle gate valve from the pipeline, can directly carry out sealing test under the power plant operation state, avoids the downtime caused by dismounting, reduces the production interruption time, improves equipment utilization.

Description

Technical Field

[0001] This utility model belongs to the field of gate valve sealing test tools, specifically, it relates to an online sealing test tool for power plant gate valves. Background Technology

[0002] Gate valves are an important type of valve in power plants, mainly installed on primary and secondary circuit pipelines, serving to cut off and isolate fluid flow. Their sealing performance directly affects the safe, reliable, economical, and stable operation of the power plant. In particular, valves used as isolation boundaries, if leaks occur, will compromise the integrity of the entire system's pressure boundary, threatening the safety of power plant operation. Therefore, reliable online sealing test tools are needed to test the sealing performance of gate valves and ensure their normal operation. However, existing gate valve testing methods and tools are not convenient or quick enough for testing.

[0003] Chinese patent publication number CN219038318U discloses an online sealing test tool for gate valves in nuclear power plants. This device can supply gas to the inside of the gate valve body through a gas filling detection component and can also display the gas pressure. When the gate valve body is closed, if the displayed gas pressure remains unchanged, it indicates that the gate valve body has good sealing performance; conversely, if it increases, it indicates that the gate valve body has poor sealing performance, thus facilitating the testing of the gate valve's sealing performance. Furthermore, the included support and adjustment component can lift the gate valve body from below, eliminating the need to hold the gate valve, making the sealing performance test easier. However, this device requires the original gate valve to be disassembled before the sealing performance test can be performed, and it cannot be used for online testing, which presents certain inconveniences. In view of this, this utility model is proposed. Utility Model Content

[0004] The technical problem to be solved by this utility model is to overcome the shortcomings of the prior art and provide an online sealing test tool for power plant gate valves, which solves the problems mentioned in the background art.

[0005] To solve the above-mentioned technical problems, the basic concept of the technical solution adopted by this utility model is as follows: An online sealing test tool for a power plant gate valve includes: a pump body, the outlet of which is connected to a sealing cover via a pipe, the sealing cover having a sealing groove connected to the pipe, the sealing groove being fitted onto the test interface of the gate valve and forming a sealing cavity connected to the pipe, a sealing gasket being fixedly installed at the bottom of the sealing cover, and two sets of clamping components for fixing the sealing cover onto the gate valve being provided on opposite sides of the sealing cover. A pressure sensor is connected between the pipe and the pump body.

[0006] Optionally, a mounting plate is fixedly installed between the sealing cover and the clamping assembly, the clamping assembly comprising: A clamping plate having an arc-shaped end face that fits against the bottom wall of the gate valve, and two racks are fixedly mounted on the clamping plate. A fixing plate is fixedly mounted on the mounting plate relative to the clamping plate. The fixing plate has two through slots through which the racks can pass. The fixing plate is provided with a limiting mechanism that can limit the two racks.

[0007] Optionally, the limiting mechanism includes: Two movable plates are movably disposed within the fixed plate relative to the slot. The fixed plate has a movable groove for the two movable plates to move. Limiting teeth are fixedly installed on both movable plates. The limiting teeth are movably disposed between the slot and the movable groove. The limiting teeth are used to limit the rack. Movable rods are fixedly installed on the ends of both movable plates opposite to the limiting teeth. The movable groove is provided with a first spring that abuts against the movable plate. The first spring is sleeved on the movable rod. A connecting plate is fixedly connected to one end of the two movable rods opposite to the movable plate. A driving plate is movably connected through the fixed plate. The driving plate is fixedly connected to the connecting plate. A pressure plate is fixedly installed on one end of the driving plate opposite to the connecting plate.

[0008] Optionally, the connecting plate is disposed through and movably within the mounting plate, and the mounting plate is provided with a movable groove that allows the connecting plate to move.

[0009] Optionally, the drive plate has a square structure to prevent it from rotating during movement.

[0010] Optionally, a second spring is fitted onto the drive plate to abut against the pressure plate and the fixing plate.

[0011] By adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art. Of course, any product implementing the present invention does not necessarily need to achieve all of the following advantages at the same time: 1. By incorporating clamping components and a sealing cover, the gate valve can be directly tested while the power plant is in operation without disassembling it from the pipeline. This avoids downtime caused by disassembly, reduces production interruption time, and improves equipment utilization. The sealing cover forms a closed cavity with the gate valve test interface through the sealing groove and sealing gasket. Combined with the fixing effect of the clamping components, it ensures no external leakage during the test and guarantees the accuracy of pressure data, thereby improving the versatility and convenience of the device. 2. By incorporating a second spring that is sleeved on the drive plate, elastic force is applied to the pressure plate and the fixed plate, ensuring that the pressure plate remains in its initial position when no external force is applied. This guarantees the effective limiting of the rack by the limiting teeth, thereby enhancing the stability of the limiting mechanism, preventing limiting failure due to vibration or other factors, and improving the safety of the tool and the accuracy of the test results.

[0012] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings. Attached Figure Description

[0013] The accompanying drawings described below are merely some embodiments. Those skilled in the art can obtain other drawings based on these drawings without any creative effort. In the drawings: Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the clamping assembly of this utility model; Figure 3 This is a schematic diagram of the sealing groove of this utility model; Figure 4 This is a schematic diagram of the connecting plate of this utility model; Figure 5 This utility model Figure 4 Enlarged structural diagram at point A; Figure 6 This is a schematic diagram of the limiting mechanism of this utility model.

[0014] The attached diagram lists the components represented by each number as follows: 1. Pipeline; 2. Pressure sensor; 3. Pump body; 4. Sealing cover; 5. Sealing gasket; 6. Mounting plate; 7. Sealing groove; 8. Second spring; 9. Clamping assembly; 91. Clamping plate; 92. Rack; 93. Fixing plate; 94. Limiting mechanism; 941. Connecting plate; 942. Pressure plate; 943. Drive plate; 944. Movable rod; 945. First spring; 946. Movable groove; 947. Movable plate; 948. Limiting tooth; 95. Slot; 10. Moving groove.

[0015] It should be noted that these accompanying drawings and textual descriptions are not intended to limit the scope of the present invention in any way, but rather to illustrate the concept of the present invention to those skilled in the art by referring to specific embodiments. Detailed Implementation

[0016] The present invention will now be described in further detail with reference to the accompanying drawings.

[0017] Please see Figure 1-6As shown, this embodiment provides an online sealing test tool for a power plant gate valve, including a pump body 3, whose outlet is connected to a sealing cover 4 via a pipe 1. The sealing cover 4 is provided with a sealing groove 7 that communicates with the pipe 1. The sealing groove 7 can be fitted onto the test interface of the gate valve and form a sealing cavity that communicates with the pipe 1. A sealing gasket 5 is fixedly installed at the bottom of the sealing cover 4. Two sets of clamping components 9 for fixing the sealing cover 4 to the gate valve are provided on opposite sides of the sealing cover 4. A pressure sensor 2 is connected between the pipe 1 and the pump body 3.

[0018] Specifically, the sealing groove 7 of the sealing cover 4 is aligned with the test interface of the gate valve and fitted, so that the sealing gasket 5 at the bottom of the sealing cover 4 fits tightly against the surface of the gate valve, forming a closed sealing cavity (this cavity is connected to the pump body 3 through the pipe 1). The two sets of clamping components 9 on both sides of the sealing cover 4 are operated to firmly fix the sealing cover 4 to the gate valve, ensuring that the sealing cover 4 will not loosen due to internal pressure during the test, thus ensuring the sealing performance of the sealing cavity. Then, the pump body 3 is started through the external control system, and the medium (usually water or air) is injected into the sealing cavity through the pipe 1, gradually increasing the pressure in the cavity. At this time, the pressure sensor 2 between the pipe 1 and the pump body 3 monitors and feeds back the current pressure value in real time. The pressure sensor 2 transmits the detection data to the external control display device. By maintaining the set pressure for a period of time, the pressure is observed. The pressure remains stable when the pressure sensor 2 reading changes, indicating that the gate valve has good sealing performance and no leakage. If the pressure drops, it indicates that the gate valve has leakage and further inspection of the sealing surface or related components is required. After the test is completed, the pump body 3 is turned off to release the pressure in the sealing cavity, the clamping assembly 9 is released, and the sealing cover 4 is removed to complete the online sealing test. The overall structure and operation steps are simple and efficient. There is no need to disassemble the gate valve from the pipeline 1. The sealing test can be carried out directly in the power plant operation state, avoiding downtime caused by disassembly, reducing production interruption time, and improving equipment utilization. The sealing cover 4 forms a closed cavity with the gate valve test interface through the sealing groove 7, the sealing gasket 5, and the fixing effect of the clamping assembly 9 to ensure no external leakage during the test and ensure the accuracy of the pressure data, thereby improving the versatility and convenience of the device.

[0019] It should be noted that, in this embodiment, gate valves in power plants (especially nuclear power plants and thermal power plants) are critical pressure boundary equipment and require regular sealing performance testing. Therefore, test interfaces are reserved according to industry standards (such as ASME BPVC) during the design phase. These interfaces are components integrated into the gate valve at the factory, with materials and pressure ratings matching the valve body, and can be directly used for online testing. The test interface of the gate valve is a dedicated interface for connecting online sealing test tools. The test interface of the gate valve is mainly used to introduce test media (such as water or oil) into key sealing parts such as the valve seat sealing surface and the cavity. Usually, the test interface of the gate valve is located on the side or top of the valve cover, which is the most common test interface location. The valve cover and valve body of the gate valve are connected by a flange, and the internal area corresponds to the sealing area between the valve disc and the valve seat. An interface (usually a threaded interface, such as NPT thread) is reserved on the side or top of the valve cover, which can directly apply test pressure to the sealing surface between the valve disc and the valve seat to test its sealing performance. For example, gate valves used in power plants to isolate high-pressure media are often designed with 1-2 test interfaces on the valve cover to facilitate the connection of pipelines for testing tools.

[0020] In this embodiment, as Figures 1 to 5 As shown, a mounting plate 6 is fixedly installed between the sealing cover 4 and the clamping assembly 9. The clamping assembly 9 includes a clamping plate 91, which has an arc-shaped end face that fits against the bottom wall of the gate valve. Two racks 92 are fixedly installed on the clamping plate 91. A fixing plate 93 is fixedly installed on the mounting plate 6 relative to the clamping plate 91. Two slots 95 are provided through the fixing plate 93 for the racks 92 to pass through. A limiting mechanism 94 is provided in the fixing plate 93 to limit the two racks 92. Specifically, the clamping plate 91 of the clamping assembly 9 fits against the bottom wall of the gate valve through the arc-shaped end face. The racks 92 pass through the slots 95 of the fixing plate 93. The limiting mechanism 94 limits the racks 92, thereby fixing the position of the clamping plate 91 and firmly fixing the sealing cover 4 to the gate valve. The arc-shaped end face design makes the clamping plate 91 fit more tightly against the bottom wall of the gate valve. The two sets of clamping assemblies 9 ensure the stability of the fixation, adapt to different specifications of gate valves, and improve the versatility of the tool.

[0021] In this embodiment, as Figures 1 to 6As shown, the limiting mechanism 94 includes two movable plates 947, which are movably disposed within a fixed plate 93 relative to a slot 95. The fixed plate 93 has a movable groove 946 for the two movable plates 947 to move. Limiting teeth 948 are fixedly installed on both movable plates 947, and are movably disposed between the slot 95 and the movable groove 946. The limiting teeth 948 are used to limit the rack 92. Movable rods 944 are fixedly installed on the ends of both movable plates 947 opposite to the limiting teeth 948. The movable groove 946 also has a first spring 945 that abuts against the movable plate 947. The first spring 945 is sleeved on the movable rod 944. A connecting plate 941 is connected to the two movable rods 944 opposite to the movable plate 947. One end of 47 is fixedly connected, and a drive plate 943 is movably connected through and on the fixed plate 93. The drive plate 943 is fixedly connected to the connecting plate 941. A pressure plate 942 is fixedly installed on the end of the drive plate 943 away from the connecting plate 941. The connecting plate 941 is movably disposed within the mounting plate 6. A movable groove 10 for the connecting plate 941 to move is provided through the mounting plate 6. Specifically, when clamping the gate valve, the operator presses the pressure plate 942 on the two sets of limit mechanisms with one hand, causing the drive plate 943 to move towards the fixed plate 93. The drive plate 943 is fixedly connected to the connecting plate 941, so the connecting plate 941 moves synchronously with the drive plate 943, and drives the two movable rods 944 to move away from the fixed plate 93. When the movable plate 947 is pulled in the direction of the plate 947, it compresses the first spring 945 sleeved on the movable rod 944 as it moves within the movable slot 946. Simultaneously, the limiting tooth 948 on the movable plate 947 moves with the movable plate 947, exiting from the slot 95 (disengaging from the rack 92), releasing the rack 92 from its limiting position. Since the rack 92 is no longer constrained by the limiting tooth 948, it can move freely along the slot 95 of the fixed plate 93. The operator pushes or pulls the clamping plate 91, causing its arc-shaped end face to fit tightly against the bottom wall of the gate valve (the arc-shaped end face design adapts to the curved structure of the gate valve bottom wall, ensuring tight contact). During adjustment, both racks 92 move synchronously along the slot 95. The clamping plate 91 is held in place until the fit between the clamping plate 91 and the gate valve meets the sealing requirements (at this point, the sealing gasket 5 at the bottom of the sealing cover 4 has initially adhered to the surface of the gate valve). Then, the pressure plate 942 is released, the first spring 945 releases its elastic force, and pushes the movable plate 947 to return to its original position closer to the slot 95. The limiting tooth 948 on the movable plate 947 re-enters the slot 95 and engages with the teeth of the rack 92 to limit the rack 92 (preventing the rack 92 from moving in the opposite direction). At this time, the clamping plate 91 is firmly fixed by the meshing of the rack 92 and the limiting tooth 948. The arc-shaped end face continues to adhere to the bottom wall of the gate valve. With the help of the sealing gasket 5 at the bottom of the sealing cover 4, the sealing cover 4 is finally stably fixed on the gate valve to ensure the sealing performance of the sealing cavity.It should be noted that in this embodiment, the limiting tooth 948 can engage with the rack 92. The teeth of the rack 92 are square, and the structure of the limiting tooth 948 can be selected according to the actual situation (in this embodiment, it is a square structure that matches the teeth). Furthermore, since the connecting plate 941 and the pressure plate 942 are arranged opposite to each other along the fixed plate 93, when the pressure plate 942 is pressed, it will drive the connecting plate 941 to move towards the mounting plate 6. The connecting plate 941 pulls the movable rod 944 to move, so that the limiting tooth 948 moves into the movable groove 946. When adjusting the position of the two sets of racks 92, it is only necessary to press the two pressure plates 942 with one hand to control multiple limiting teeth 948, thereby improving the overall installation efficiency.

[0022] In this embodiment, as Figure 5 As shown, the drive plate 943 has a square structure to prevent it from rotating during movement. Specifically, the drive plate 943 has a square structure to prevent it from rotating during movement, ensuring the stability of the connection with the connecting plate 941 and the accuracy of the operation.

[0023] In this embodiment, as Figures 2 to 5 As shown, a second spring 8 is sleeved on the drive plate 943, which abuts against the pressure plate 942 and the fixed plate 93. Specifically, the second spring 8 is sleeved on the drive plate 943 and applies elastic force to the pressure plate 942 and the fixed plate 93, so that the pressure plate 942 remains in the initial position when no external force is applied, ensuring that the limiting tooth 948 effectively limits the rack 92, thereby enhancing the stability of the limiting mechanism 94, preventing the limiting mechanism from failing due to vibration and other factors, and improving the safety of the tool and the accuracy of the test results.

[0024] Working principle: First, confirm that the system containing the gate valve under test has been partially isolated. This is done by closing the auxiliary valves upstream and downstream of the gate valve (such as gate valves and isolation valves) to disconnect it from other parts of the system, ensuring complete isolation between the test area and the main system flow. This prevents media cross-contamination from affecting test accuracy or causing safety risks. Then, using the system's drain valve or a dedicated pressure relief device, completely release any residual media (such as water, steam, oil, etc.) and pressure in the gate valve cavity and upstream and downstream pipelines 1, ensuring the valve is pressureless before the test and guaranteeing operational safety. Next, align the sealing cover 4 with the gate valve's test interface (such as the interface on the top of the valve cover), aligning the sealing groove 7 with the interface. While holding the gate valve, the operator presses the pressure plate 942, causing the drive plate 943 to move closer to the fixed plate 93. The drive plate 943 is fixedly connected to the connecting plate 941, so the connecting plate 941 moves synchronously with the drive plate 943, pulling the two movable rods 944 away from the movable plate 947. When the movable plate 947 moves within the movable slot 946, it compresses the first spring 945 sleeved on the movable rod 944. Simultaneously, the limiting tooth 948 on the movable plate 947 moves with the movable plate 947, disengaging from the slot 95 (disengaging from the rack 92), releasing the rack 92 from its limiting position. Since the rack 92 is no longer constrained by the limiting tooth 948, it can move freely along the slot 95 of the fixed plate 93. The operator can then push or pull the clamping plate 91 to... The arc-shaped end face of the clamping plate 91 fits tightly against the bottom wall of the gate valve (the arc-shaped end face design adapts to the curved structure of the bottom wall of the gate valve to ensure tight contact). During the adjustment process, the two racks 92 move synchronously along the slot 95 until the fit between the clamping plate 91 and the gate valve meets the sealing requirements (at this time, the sealing gasket 5 at the bottom of the sealing cover 4 has initially fit against the surface of the gate valve). Then, the pressure plate 942 is released, the first spring 945 releases its elastic force, and pushes the movable plate 947 to reset towards the slot 95.The limiting tooth 948 on the movable plate 947 re-enters the slot 95 and engages with the teeth of the rack 92, thus limiting the rack 92 (the teeth of the rack 92 have a square structure to prevent the rack 92 from moving in the opposite direction). At this time, the clamping plate 91 is firmly fixed by the engagement of the rack 92 and the limiting tooth 948. The arc-shaped end face continues to adhere to the bottom wall of the gate valve. Together with the sealing gasket 5 at the bottom of the sealing cover 4, the sealing cover 4 is finally stably fixed on the gate valve, ensuring the sealing performance of the sealing cavity. Then, the pump body 3 is started through the external control system, and the medium (usually water or air) is injected into the sealing cavity through the pipeline 1, gradually increasing the pressure in the cavity. At this time, the pressure sensor 2 between the pipeline 1 and the pump body 3 monitors and feeds back the current pressure value in real time. The pressure sensor 2 transmits the detection data to the external control display device to maintain the set pressure. Over a period of time, observe the changes in the reading of pressure sensor 2. If the pressure remains stable, it indicates that the gate valve has good sealing performance and no leakage. If the pressure drops, it indicates that the gate valve has leakage, and further inspection of the sealing surface or related components is required. After the test is completed, shut off pump body 3, release the pressure in the sealing cavity, loosen clamping assembly 9, and remove sealing cover 4 to complete the online sealing test. The overall structure and operation steps are simple and efficient. There is no need to disassemble the gate valve from pipeline 1. The sealing test can be carried out directly in the power plant's operating state, avoiding downtime caused by disassembly, reducing production interruption time, and improving equipment utilization. Sealing cover 4 forms a closed cavity with the gate valve test interface through sealing groove 7, sealing gasket 5, and the fixing effect of clamping assembly 9 to ensure no external leakage during the test and ensure the accuracy of pressure data, thereby improving the versatility and convenience of the device.

[0025] This utility model is not limited to the above-described embodiments. Anyone should know that structural changes made under the guidance of this utility model, and any technical solutions that are the same as or similar to this utility model, fall within the protection scope of this utility model. Technical aspects, shapes, and structures not described in detail in this utility model are all publicly known technologies.

Claims

1. An online sealing test tool for power plant gate valves, characterized in that, include: The pump body (3) has a sealing cover (4) connected to its outlet via a pipe (1). The sealing cover (4) is provided with a sealing groove (7) that communicates with the pipe (1). The sealing groove (7) can be fitted onto the test interface of the gate valve and form a sealed cavity that communicates with the pipe (1). A sealing gasket (5) is fixedly installed at the bottom of the sealing cover (4). Two sets of clamping components (9) for fixing the sealing cover (4) onto the gate valve are provided on opposite sides of the sealing cover (4). A pressure sensor (2) is connected between the pipe (1) and the pump body (3).

2. The online sealing test tool for power plant gate valves according to claim 1, characterized in that, An mounting plate (6) is fixedly installed between the sealing cover (4) and the clamping assembly (9), and the clamping assembly (9) includes: The clamping plate (91) has an arc-shaped end face that fits against the bottom wall of the gate valve, and two racks (92) are fixedly installed on the clamping plate (91). A fixing plate (93) is fixedly mounted on the mounting plate (6) relative to the clamping plate (91). The fixing plate (93) has two slots (95) through which the racks (92) can pass. The fixing plate (93) has a limiting mechanism (94) that can limit the two racks (92).

3. The online sealing test tool for power plant gate valves according to claim 2, characterized in that, The limiting mechanism (94) includes: Two movable plates (947) are movably disposed within the fixed plate (93) relative to the slot (95). The fixed plate (93) is provided with a movable groove (946) for the two movable plates (947) to move. Limiting teeth (948) are fixedly installed on both movable plates (947). The limiting teeth (948) are movably disposed between the slot (95) and the movable groove (946). The limiting teeth (948) are used to limit the rack (92). Movable rods (944) are fixedly installed on the ends of the two movable plates (947) away from the limiting teeth (948). The movable groove (946) is also provided with a first spring (945) that abuts against the movable plate (947). The first spring (945) is sleeved on the movable rod (944). A connecting plate (941) is fixedly connected to one end of the two movable rods (944) away from the movable plate (947). A driving plate (943) is movably connected through the fixed plate (93). The driving plate (943) is fixedly connected to the connecting plate (941). A pressure plate (942) is fixedly installed on one end of the driving plate (943) away from the connecting plate (941).

4. The online sealing test tool for power plant gate valves according to claim 3, characterized in that, The connecting plate (941) is disposed through and movably disposed within the mounting plate (6), and the mounting plate (6) is provided with a movable groove (10) through which the connecting plate (941) can move.

5. The online sealing test tool for power plant gate valves according to claim 4, characterized in that, The drive plate (943) has a square structure to prevent it from rotating during movement.

6. The online sealing test tool for power plant gate valves according to claim 4, characterized in that, A second spring (8) is fitted on the drive plate (943) to abut against the pressure plate (942) and the fixing plate (93).

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