Valve seat extracting device

Abstract

The utility model relates to the technical field of valve part extracting devices, in particular to a valve seat extracting device. The device is used for separating a valve body from a valve seat, the valve seat is sleeved with the valve body, the device comprises a pull rod and a lifting rod, the pull rod comprises a first end and a second end opposite to the first end, the first end is used for stretching into the valve seat, an operation channel extending in the axial direction of the pull rod is arranged in the pull rod, and the lifting rod is arranged in the operation channel. The lifting rod can move along the operation channel. The lifting rod can drive the first end of the pull rod to expand in the radial direction of the pull rod and then abut against the end face of the base so that the pull rod can drive the valve seat to be separated from the valve body. The expansion valve can adapt to valve seats with different hole diameters through expansion, so that the valve seats with different hole diameters can be taken out of the valve body.

Description

Technical Field

[0001] The utility model relates to the technical field of valve component extraction devices, in particular to a valve seat extraction device. Background Art

[0002] In fluid transportation systems, valves are used to open and close pipelines and control flow direction. The valve body is the main structure of the valve, forming a passage for the fluid to pass through. The valve seat is located within the valve body and is the sealing component of the valve. When the valve is closed, the valve seat forms a sealing contact with the closing member (such as the gate), thereby preventing the fluid from passing through.

[0003] During power plant maintenance, valves are disassembled to remove and replace damaged parts. For example, the valve seat needs to be removed to replace the seat gasket underneath. However, due to factors such as rust on the valve seat and the small diameter of the valve body, the valve seat often becomes stuck and cannot be removed during valve disassembly. The related technology usually involves cutting the valve to remove the valve seat, which damages the valve seat and affects its reuse.

[0004] Therefore, how to provide a valve seat extraction device that can remove valve seats with different apertures from a valve body and facilitate the reuse of the disassembled valve seats has become a technical problem that needs to be solved urgently. Utility Model Content

[0005] The present invention aims to solve at least one of the technical problems in the prior art. To this end, the present invention provides a valve seat extraction device capable of extracting valve seats of different apertures from a valve body.

[0006] To achieve the above-mentioned purpose, one aspect of an embodiment of the present invention provides a valve seat extraction device for separating a valve body and a valve seat, wherein the valve body is sleeved on the valve seat, and the valve seat extraction device comprises:

[0007] a pull rod comprising a first end and a second end opposite to the first end, wherein the first end is configured to extend into the valve seat, and an operating channel is provided inside the pull rod and extends axially along the pull rod; and

[0008] a lifting rod, disposed in the operating channel, the lifting rod being movable along the operating channel;

[0009] The lifting rod can drive the first end of the pull rod to expand in the radial direction of the pull rod and abut against the end surface of the valve seat, so that the pull rod can drive the valve seat to separate from the valve body.

[0010] According to some embodiments of the present invention, the lifting rod includes:

[0011] a lifting rod body, disposed in the operating channel; and

[0012] The abutment portion is connected to one end of the lifting rod body and is used to abut against the first end of the pull rod. The cross-sectional diameter of the abutment portion gradually increases from the end close to the lifting rod body to the end away from the lifting rod body.

[0013] According to some embodiments of the present invention, the lifting rod further comprises:

[0014] The operating portion is connected to one end of the lifting rod body away from the abutting portion and is used to be connected to an external operating member so that the lifting rod can move along the operating channel.

[0015] According to some embodiments of the present invention, the pull rod includes:

[0016] a rod body; and

[0017] A plurality of deformation parts are connected to the first end of the rod body and are arranged at intervals along the circumference of the rod body.

[0018] According to some embodiments of the present invention, the plurality of deformation portions are arranged at equal intervals.

[0019] According to some embodiments of the present invention, the pull rod further includes:

[0020] An annular flange is connected to the end of the deformed portion away from the rod body, and the annular flange is used to abut against the end surface of the valve seat.

[0021] According to some embodiments of the present invention, an internal thread is provided on the inner wall of the operating channel, and an external thread is provided on the outer peripheral wall of the lifting rod, and the external thread is threadably connected to the internal thread.

[0022] According to some embodiments of the present invention, the valve seat extraction device further includes:

[0023] a rotating nut, sleeved on the pull rod and rotatably connected to the pull rod; and

[0024] The support member is sleeved on the pull rod, and the two opposite end faces of the support member can respectively abut against the end faces of the valve body and the rotating nut to limit the movement of the rotating nut.

[0025] According to some embodiments of the present invention, a through hole is provided on the support member, and the through hole is used for the pull rod to pass through, and the aperture of the through hole is larger than the cross-sectional diameter of the pull rod.

[0026] According to some embodiments of the present invention, the support member includes:

[0027] a supporting portion, wherein the through hole is formed on the supporting portion, and an end surface of the supporting portion is used to abut against an end surface of the rotating nut; and

[0028] The extension portion is connected to the end of the support portion, and the extension portion is used to abut against the end surface of the valve body.

[0029] The valve seat extraction device proposed by the present invention has at least the following beneficial effects: applying external force to one end of the lifting rod so that the lifting rod can drive the first end of the pull rod to expand radially along the pull rod, so that the diameter of the first end can match the aperture of the valve seat, and the first end of the pull rod after radial expansion can abut the end face of the valve seat. Continuing to apply force to the lifting rod to move the lifting rod in a direction away from the valve seat, thereby driving the pull rod to move in a direction away from the valve seat, and further, the pull rod can drive the valve seat to separate from the valve body. Therefore, compared to the related art method of removing the valve seat by cutting the valve, the present invention proposes a valve seat extraction device that can adapt to valve seats of different apertures by expansion, thereby removing valve seats of different apertures from the valve body. In this process, the valve seat will not be damaged, and the disassembled valve seat can be reused.

[0030] Additional aspects and advantages of the present invention will be given in part in the following description and will become apparent from the following description or learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a structural cross-sectional view of the valve seat extraction device provided by an embodiment of the utility model;

[0032] Figure 2 This is a structural diagram of a valve seat extraction device provided by an embodiment of the utility model;

[0033] Figure 3 This is another structural diagram of the valve seat extraction device provided by an embodiment of the present utility model;

[0034] Figure 4 It is a side view of the pull rod provided by an embodiment of the utility model;

[0035] Figure 5 This is a top view of the pull rod provided by an embodiment of the utility model;

[0036] Figure 6 It is a side view of the lifting rod provided by an embodiment of the utility model;

[0037] Figure 7 This is a top view of the lifting rod provided by an embodiment of the utility model;

[0038] Figure 8This is a structural diagram of a support member provided by an embodiment of the present utility model;

[0039] Figure 9 It is a structural schematic diagram of the rotating nut provided in an embodiment of the utility model.

[0040] Figure markings: valve seat extraction device 100, valve seat 101, valve body 102, pull rod 110, first end 111, second end 112, operating channel 113, rod body 114, deformation portion 115, annular flange 116, lifting rod 120, lifting rod body 121, abutment portion 122, operating portion 123, support member 130, through hole 131, support portion 132, extension portion 133, rotating nut 140. DETAILED DESCRIPTION

[0041] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0042] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention.

[0043] In the description of this utility model, "several" means more than one, "plurality" means more than two, "greater than," "less than," and "exceed" are understood to exclude the number itself, while "above," "below," and "within" are understood to include the number itself. The use of the terms "first" and "second" is solely for the purpose of distinguishing technical features and is not to be construed as indicating or implying relative importance, implicitly specifying the number of the indicated technical features, or implicitly specifying the order of the indicated technical features.

[0044] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, and connecting should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0045] In the description of the present invention, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the exemplary expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0046] Before further explaining the embodiments of the present invention in detail, the nouns and terms involved in the embodiments of the present invention are explained. The nouns and terms involved in the embodiments of the present invention are subject to the following interpretations:

[0047] Valves are pipe fittings used to open and close pipelines, control flow direction, and regulate and control the parameters of the conveyed medium (temperature, pressure, and flow). Valves are control components in fluid conveying systems, performing functions such as shutoff, regulation, diversion, backflow prevention, pressure stabilization, flow diversion, and overflow pressure relief. Valves can be categorized by their function as shutoff valves, check valves, and regulating valves. Valves are widely used in various industrial fields, including but not limited to thermal power generation, petrochemicals, nuclear power, water treatment, construction, and shipbuilding.

[0048] Valve seat: A device used to support the valve core in the fully closed position. The valve seat is a removable surface component inside the valve that supports the valve core in the fully closed position and forms a sealing pair. The valve seat usually forms a sealing surface with the valve's closing element (such as the valve disc, valve core or ball) to prevent fluid from passing through the valve.

[0049] The technical problem to be solved by this application is illustrated using a manual drain control valve in a nuclear power plant as an example. To ensure the proper functioning of the nuclear power plant, the manual drain control valve (hereinafter referred to as the valve) must be regularly inspected and maintained. The valves used in nuclear power plants are welded to the pipelines. During valve inspection and maintenance, the valves must be disassembled to replace damaged parts and ensure proper operation.

[0050] The valve gasket is an indispensable component of the valve. The main function of the valve seat gasket is to ensure the tight contact between the valve body and the valve cover, so that the valve can be completely sealed when closed, preventing the medium (such as water, gas or liquid) from leaking from the inside of the valve to the external environment, and avoiding problems such as energy waste, environmental pollution or equipment damage caused by leakage. Every time the valve is repaired, the valve seat gasket needs to be replaced. Therefore, it is necessary to remove the valve seat first and then replace the valve seat gasket in the valve. If the valve seat is not damaged, it does not need to be replaced. However, due to the narrow installation space of the valve, the small diameter of the valve body, and the rust of the valve seat caused by long-term use of the valve, the valve seat is prone to getting stuck when it is extracted from the valve, making it impossible to remove the valve seat. Furthermore, the inability to remove the valve seat makes it impossible to replace the valve seat gasket and further inspect the defects of the valve seat and its sealing surface.

[0051] In the related art, the main method of extracting the valve seat is to cut the valve, replace the valve body, and then weld the new valve body to the pipeline. During the cutting process, the valve seat will be damaged. At this time, it is necessary to replace the new valve seat and reinstall the new valve seat into the valve body. This method has a high safety risk. The valve seat cannot be reused after being damaged, which increases the cost of maintenance. In addition, due to the equipment differences between new and old equipment, it is easy to cause unqualified test results during non-destructive testing (such as penetrant testing (PT) and radiographic testing (RT)). Therefore, how to provide a valve seat that can adapt to different apertures by expansion, so as to remove valve seats of different apertures from the valve body, has become a technical problem that needs to be solved urgently.

[0052] Based on this, the present invention provides a valve seat extraction device 100 that can adapt to valve seats of different pore diameters by expanding, thereby removing valve seats of different pore diameters from a valve body. During this process, the valve seat will not be damaged, and the removed valve seat can be reused.

[0053] Please refer to Figure 1 、 Figure 2 and Figure 3 , Figure 1 This is a structural cross-sectional view of the valve seat 101 extraction device provided by an embodiment of the present utility model. Figure 2 This is a structural diagram of a valve seat 101 extraction device provided by an embodiment of the present utility model, specifically a front view. Figure 3 This is another structural diagram of the valve seat 101 extraction device provided by the embodiment of the present utility model, specifically a side view. Figure 1As shown, the valve seat extraction device 100 is used to separate the valve body 102 and the valve seat 101. The valve body 102 is sleeved on the valve seat 101. The valve seat extraction device 100 can cooperate with the valve hole of the valve seat 101 to extract the valve seat 101 in the valve. Specifically, the valve seat extraction device 100 includes: a pull rod 110 and a lifting rod 120. Please refer to Figure 4 as well as Figure 5 , Figure 4 This is a side view of the pull rod 110 provided in an embodiment of the present utility model. Figure 5 The figure shows a top view of the pull rod 110 provided in an embodiment of the present invention. Specifically, the pull rod 110 includes a first end 111 and a second end 112 opposite the first end 111. The first end 111 is made of a high-strength elastic material, such as an iron alloy or a nickel alloy, which is not limited here. In the present invention, the function of the first end 111 is to expand under external force to support the lower edge of the valve seat 101, thereby securing the valve seat 101 and facilitating its removal.

[0054] In the embodiment of the present disclosure, the pull rod 110 is inserted into the valve hole (not shown in the figure), and the first end 111 and the second end 112 of the pull rod 110 are arranged on opposite sides of the valve hole. Specifically, in actual use, the first end 111 of the pull rod 110 is arranged inside the valve hole, and the second end 112 is arranged outside the valve hole, so that the entire pull rod 110 passes through the valve seat 101.

[0055] The first end 111 of the pull rod 110 can be expanded or contracted to adapt to valve holes of different sizes. Furthermore, an operating channel 113 extending along the axial direction of the pull rod 110 is provided inside the pull rod 110. The lifting rod 120 can be disposed in the operating channel 113 and move along the operating channel 113. Figure 6 and Figure 7 , Figure 6 This is a side view of the lifting rod 120 provided in an embodiment of the present invention. Figure 7 This is a top view of the lifting rod 120 provided in an embodiment of the present invention. The length of the lifting rod 120 may be slightly greater than that of the tie rod 110. The lifting rod 120 can move within the operating channel 113 of the tie rod 110, specifically moving away from the valve seat 101, to cause the first end 111 of the tie rod 110 to expand radially along the tie rod 110. After radial expansion, the first end 111 of the tie rod 110 can abut against the end surface of the valve seat 101, allowing the tie rod 110 to drive the valve seat 101 away from the valve body 102, thereby removing the valve seat 101 from the valve body 102.

[0056] In the embodiments of this disclosure, please continue to refer to Figure 6 and Figure 7The lifting rod 120 specifically includes a lifting rod body 121 and abutting portion 122. For details, please continue to refer to Figure 6 or Figure 7 As shown in the figure, the lifting lever body 121 is disposed within the operating channel 113, and the abutment portion 122 can be connected to one end of the lifting lever body 121. The length of the lifting lever body 121 is variable and can be adjusted according to the depth of the valve seat 101 to accommodate operating environments at different depths. The length of the lifting lever body 121 is always greater than the length of the rod body 114. The operating portion 123 of the lifting lever 120 is always exposed from the operating channel 113 of the pull rod 110, and the abutment portion 122 of the lifting lever 120 is always exposed from the operating channel 113.

[0057] The cross-sectional diameter of the abutment portion 122 may gradually increase from the end closest to the lifting rod body 121 to the end farther from the lifting rod body 121. The cross-sectional area of ​​the abutment portion 122 is sufficiently large that, when the first end 111 of the pull rod 110 abuts the end surface of the valve seat 101, the first end 111 of the pull rod 110 may be secured, thereby preventing the valve seat 101 from slipping during the extraction process.

[0058] Specifically, the abutment portion 122 can be designed as a conical structure, such as a truncated cone. The abutment portion 122 is made of a material that is not easily deformed. The abutment portion 122 can cooperate with the deformable first end 111 of the pull rod 110 to make the deformation of the first end 111 of the pull rod 110 more stable. The deformation speed of the first end 111 can be adjusted by adjusting the movement speed of the lifting rod 120 within the operating channel 113, ensuring that the deformation process of the first end 111 is controllable, ultimately improving the stability of the extraction of the valve seat 101.

[0059] In the disclosed embodiment, the lifting rod 120 further includes an operating portion 123. Specifically, the operating portion 123 can be connected to an end of the lifting rod body 121 away from the abutment portion 122 and can be partially exposed from the operating channel 113. The operating portion 123 is used to connect to an external operating member. When an external force is applied to the lifting rod 120 through the operating member, the lifting rod 120 can move within the operating channel 113 under the action of the external force, specifically in a direction away from or toward the valve seat 101. In actual use, the operating member can be pliers (such as locking pliers, pipe wrenches, etc., which are not limited here), a wrench (such as a socket wrench, adjustable wrench, electric wrench, etc., which are not limited here), etc.

[0060] In the embodiments of this disclosure, please refer to Figure 4 or Figure 5As shown in the figure, the pull rod 110 may include a rod body 114 and a plurality of deformed portions 115. The length of the rod body 114 is not greater than the length of the lifting rod body 121. The length of the rod body 114 is variable to adapt to an operating environment with a deeper valve hole.

[0061] The deformation part 115 can be connected to the first end 111 of the rod body 114 and arranged at intervals along the circumference of the rod body 114. The number of deformation parts 115 can be set according to actual needs, such as four, six, etc., which is not limited here. The size of each deformation part 115 is equal.

[0062] Furthermore, when a force is applied to the operating portion 123 through the operating member, if the lifting rod 120 moves in a direction away from the valve seat 101, the first end 111 of the pull rod 110 can be squeezed to produce radial expansion, and the peripheral side of the abutment portion 122 can abut against the inner side of the first end 111 of the pull rod 110, further abutting the valve seat 101 to fix the valve seat 101. If the lifting rod 120 moves in a direction close to the valve seat 101, the abutment portion 122 can contract radially to reduce the cross-sectional area of ​​the abutment portion 122, and then the first end 111 of the pull rod 110 can contract to accommodate a valve seat 101 with a smaller aperture. In the embodiment of the present disclosure, the pull rod 110 and the lifting rod 120 can cooperate with each other and flexibly adjust to accommodate apertures of different sizes, so that valve seats 101 with different apertures can be removed from the valve body 102. During this process, the valve seat 101 will not be damaged, and the extracted valve seat 101 can be reused.

[0063] In the disclosed embodiment, the multiple deformation portions 115 of the pull rod 110 can be arranged at equal intervals at the first end 111 of the rod body 114, so that when the deformation portion 115 deforms and abuts the valve seat 101, the force on the valve seat 101 is uniform, thereby ensuring the stability of the valve seat 101 during the extraction process. The deformation portion 115 can be squeezed by the abutment portion 122 of the lifting rod 120 to deform (expand) so that the deformation portion 115 can abut the bottom edge of the valve seat 101. There is a movable gap between adjacent deformation portions 115, and the movable gap can reserve movable space for the interaction between the deformation portions 115.

[0064] Furthermore, one end of the deformable portion 115 remains connected to the second end 112 of the tie rod 110, while the other end of the deformable portion 115 is suspended. This ensures that the deformable portion 115 is not restricted by space and can expand when squeezed to secure the valve seat 101. It should be noted that the deformation of the deformable portion 115 is elastic and can contract to return to its original shape after the extrusion force is removed, allowing for multiple uses.

[0065] It should be noted that the valve seat 101 extraction device provided by the present invention can extract the valve seats 101 of different valves. The sizes of the pull rod 110 and the lifting rod 120 in the valve seat 101 extraction device can be designed and adjusted according to the actual size of the valve (length, diameter, etc.), and the first end 111 of the pull rod 110 can be radially expanded to adapt to valve seats 101 with different apertures.

[0066] In the disclosed embodiment, the pull rod 110 further includes an annular flange 116, which can be connected to the end of the deforming portion 115 away from the rod body 114. When the operating portion 123 is operated by an external operating member, the lifting rod 120 can move in a direction away from the valve seat 101, the abutting portion 122 can abut against the first end 111 of the pull rod 110 to radially deform the deforming portion 115, and the annular flange 116 can abut against the end surface of the valve seat 101 to fix the valve seat 101. Furthermore, by continuing to apply force to the operating portion 123 by the external operating member, the lifting rod 120 can further move in a direction away from the valve seat 101, while driving the pull rod 110, and finally the valve seat 101 moves accordingly, and the valve seat 101 is removed from the valve body 102.

[0067] In some embodiments, the inner wall of the operating channel 113 is provided with an internal thread, and the outer peripheral wall of the lifting rod 120 is provided with an external thread that matches the internal thread, so that the pull rod 110 can be threadedly connected to the lifting rod 120. Specifically, as described above, the operating portion 123 can be operated by an external operating member to move the lifting rod 120 within the operating channel 113. The threaded connection can make moving the lifting rod 120 more labor-saving. In addition, the threaded connection makes the connection between the lifting rod 120 and the pull rod 110 more secure and tight, preventing the pull rod 110 or the lifting rod 120 from slipping during the lifting process, thereby ensuring the stability of the extraction of the valve seat 101.

[0068] It should be noted that the length of the internally threaded area of ​​the operating channel 113 at the second end 112 of the pull rod 110 can be adjusted according to actual needs to ensure a sufficiently tight connection between the pull rod 110 and the lifting rod 120 to withstand a large weight. Furthermore, the length of the externally threaded area on the outer circumferential wall of the lifting rod 120 should be no less than the length of the internally threaded area of ​​the operating channel 113 to ensure that when the operating portion 123 of the lifting rod 120 is partially exposed, there is still sufficient threaded area for connection with the operating channel 113.

[0069] Furthermore, one end of the deformable portion 115 remains connected to the second end 112 of the tie rod 110, while the other end of the deformable portion 115 is suspended, ensuring that the deformable portion 115 is not restricted by space and can expand when squeezed to secure the valve seat 101. The degree of expansion of the deformable portion 115 determines the change in the diameter of the first end 111 of the tie rod 110, so that the first end 111 of the tie rod 110 can match the aperture size of the valve seat 101. It should be noted that the deformation of the deformable portion 115 is elastic and can shrink to return to its original shape after the extrusion force is removed, allowing for multiple uses.

[0070] In some embodiments, the operating portion 123 of the lifting rod 120 can be partially exposed from the second end 112 of the tie rod 110. By applying force to the exposed portion through an external operating tool, the lifting rod 120 is driven to move within the operating channel 113 in a direction away from or toward the valve seat 101. During the above process, to ensure that the abutment portion 122 and the operating portion 123 of the lifting rod 120 are always exposed from the operating channel 113 of the tie rod 110, the length of the lifting rod 120 is greater than the length of the tie rod 110. It should be noted that the operating portion 123 of the lifting rod 120 is slightly exposed from the operating channel 113, ensuring that the abutment portion 122 engages with the first end 111 of the tie rod 110 at the opening of the operating channel 113. Slight movement of the lifting rod 120 away from the valve seat 101 causes the abutment portion 122 to press against the first end 111 of the tie rod 110, rapidly deforming the first end 111 and saving time in removing the valve seat 101.

[0071] In some embodiments, the valve seat extraction device 100 provided by the present invention further includes a rotating nut 140 and a support member 130. Figure 8 , Figure 8 This is a structural diagram of the support member 130 provided in an embodiment of the present utility model. Figure 9 It is a structural schematic diagram of the rotating nut 140 provided in an embodiment of the present utility model.

[0072] Specifically, the rotating nut 140 is sleeved on the pull rod 110 and can be connected to the pull rod 110 for rotation. The rotating nut 140 can be a hexagonal nut or other types of nut, and there is no limitation here. Starting from the second end 112 of the pull rod 110, the rotating nut 140 is screwed toward the valve seat 101 using an external operating tool. The support member 130 can be sleeved on the pull rod 110, and the two opposite end faces of the support member 130 can respectively abut against the end faces of the valve body 102 and the rotating nut 140 to limit the movement of the rotating nut 140. The rotating nut 140 generates an upward reaction force on the pull rod 110, that is, the pull rod 110 can move in a direction away from the rotating nut 140, thereby transmitting the force to the lifting rod 120, so that the lifting rod 120 drives the valve seat 101 to move in a direction away from the valve body 102, so as to remove the valve seat 101 from the valve body 102.

[0073] The shape of the support member 130 can be designed based on the valve's shape, and its outer diameter can also be adjusted based on the valve's actual flow rate. During actual use, the support member 130 is placed on the target valve to secure the valve seat extraction device 100 and ensure stability throughout the extraction process. Its operating principle is as follows: the support member 130 includes a support portion 132 and an extension portion 133. The support portion 132 can rest on the end surface of the valve body 102, while the extension portion 133 extends toward the valve body 102 to further secure the support portion 132 resting on the valve body 102. When the rotating nut 140 applies force toward the valve body 102, the support portion 132 and extension portion 133 support the valve body 102, preventing the pull rod 110 from deviating from its path as it moves away from the valve body 102. This ensures the stability of the valve seat 101 as it moves away from the valve body 102, thereby enhancing the stability of the valve seat 101 extraction process.

[0074] Support portion 132 defines a through hole 131 through which tie rod 110 passes. The diameter of through hole 131 is larger than the cross-sectional diameter of tie rod 110, allowing tie rod 110 to move within through hole 131 while minimizing resistance to movement. The outer diameter of support member 130 is larger than the diameter of the valve hole, ensuring a more stable attachment of support member 130 to the valve.

[0075] In the embodiment of the present disclosure, the support member 130 can cooperate with the rotating nut 140 to provide power for extracting the valve seat 101. Specifically, the end face of the support portion 132 is used to abut against the end face of the rotating nut 140, and the extension portion 133 is used to abut against the end face of the valve body 102. Specifically, the extension portion 133 can abut against the end face of the valve body 102 so that the valve seat extraction device 100 can be fixed on the valve body 102. For the two opposite sides of the support portion 132, one side can abut against the side of the first end 111 of the pull rod 110 that is away from the valve seat 101, and the other side can abut against the rotating nut 140. When the deformation portion 115 abuts against the end face of the valve seat 101, the rotating nut 140 is screwed toward the valve direction starting from the second end 112 of the pull rod 110 through an external operating tool. When the rotating nut 140 is driven to one side of the support portion 132 and contacts the support portion 132, the rotating nut 140 is further screwed toward the valve seat 101 using an external operating tool. At this point, the support portion 132 acts as a limiter, preventing the rotating nut 140 from further moving toward the valve seat 101, allowing the rotating nut 140 and the support portion 132 to interact. Furthermore, the support portion 132 provides a reaction force, synchronously lifting the pull rod 110 that is stuck on the lower edge of the valve seat 101, ultimately removing the valve seat 101 from the valve.

[0076] It is understandable that the valve seat extraction device 100 provided by the present invention converts the force of the rotation of the rotating nut 140 and the force of the interaction between the rotating nut 140 and the support member 130 into a force that drives the pull rod 110 to move, and can remove the valve seat 101 with a small amount of force. The valve seat extraction device 100 can adapt to valve seats 101 of different apertures by expanding, thereby removing valve seats 101 of different apertures from the valve body 102. The valve seat 101 will not be damaged during the extraction process, so that the disassembled valve seat 101 can be reused. It is understandable that the valve seat extraction device 100 provided by the present invention has a simple structure, is easy to operate, and can be used to remove various valve seats 101 and valve cages.

[0077] The valve seat extraction device 100 provided by the present invention solves the problem that the valve seat 101 is stuck and cannot be removed. Compared with the related art, the present invention adopts the method of partial replacement of the valve seat 101 instead of replacement of the entire valve, which effectively solves the work difficulties of on-site maintenance and overhaul of the power plant. First, the valve seat extraction device 100 provided by the present invention will not cause damage to the valve seat 101 during the overhaul process, and there is no need to replace the new valve seat 101 spare parts, avoiding the uncertainty caused by the difference between the new and old valve spare parts, and reducing the operational difficulties that the on-site operators of the power plant may encounter when replacing spare parts, such as the mismatch between the new and old spare parts that may occur during the cutting, grinding and welding process, and the resulting problem of unqualified penetration testing or radiographic testing. Secondly, it avoids the high-risk hot work such as cutting, grinding, welding, etc. involved in the replacement of the entire valve, significantly reducing the safety hazards at the work site. Furthermore, partial replacement of the valve seat 101 greatly reduces the cost of manpower and spare parts, and improves the efficiency of overhaul and maintenance. Finally, the valve seat extraction device 100 is particularly suitable for solving the problem of difficult removal of the valve seat 101 in a narrow space, making up for the shortcomings of the related art. In summary, the valve seat extraction device 100 provided by this novel invention simplifies the maintenance process, reduces maintenance costs and risks, and improves the safety and efficiency of on-site operations.

[0078] Taking the manual regulating valve for drains in nuclear power plants as an example, the beneficial effects of the present invention are further illustrated. There are a large number of manual regulating valves for drains in nuclear power plants. During periodic maintenance, the valve seat 101 becomes stuck and cannot be removed. A dedicated valve seat extraction device 100 is designed by combining on-site operating space and relevant dimensional measurements of the valve body 102. Through practice, the valve seat 101 can be removed smoothly, solving the maintenance anomaly problem of the nuclear power plant. While effectively improving the work efficiency of maintenance technicians and ensuring the quality of maintenance, it also greatly saves the maintenance cost of the power plant. In addition, the use of the valve seat extraction device 100 can avoid high-risk work on site, protect power plant equipment, shorten the maintenance period, and lay a good foundation for the unit to be connected to the grid for power generation.

[0079] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Various modifications can be made within the scope of knowledge possessed by a person skilled in the art without departing from the spirit of the present invention. In addition, the embodiments of the present invention and the features of the embodiments can be combined with each other unless there is a conflict.

Claims

1. A valve seat extraction device for separating a valve body and a valve seat, wherein the valve body is sleeved on the valve seat, characterized in that: The valve seat extraction device comprises: a pull rod comprising a first end and a second end opposite to the first end, wherein the first end is configured to extend into the valve seat, and an operating channel is provided inside the pull rod and extends axially along the pull rod; and a lifting rod, disposed in the operating channel, the lifting rod being movable along the operating channel; The lifting rod can drive the first end of the pull rod to expand in the radial direction of the pull rod and abut against the end surface of the valve seat, so that the pull rod can drive the valve seat to separate from the valve body.

2. The valve seat extraction device according to claim 1, characterized in that: The lifting rod comprises: a lifting rod body, disposed in the operating channel; and The abutment portion is connected to one end of the lifting rod body and is used to abut against the first end of the pull rod. The cross-sectional diameter of the abutment portion gradually increases from the end close to the lifting rod body to the end away from the lifting rod body.

3. The valve seat extraction device according to claim 2, characterized in that: The lifting rod also includes: The operating portion is connected to one end of the lifting rod body away from the abutting portion and is used to be connected to an external operating member so that the lifting rod can move along the operating channel.

4. The valve seat extraction device according to any one of claims 1 to 3, characterized in that: The pull rod comprises: a rod body; and A plurality of deformation parts are connected to the first end of the rod body and are arranged at intervals along the circumference of the rod body.

5. The valve seat extraction device according to claim 4, characterized in that: The plurality of deformation portions are arranged at equal intervals.

6. The valve seat extraction device according to claim 4, characterized in that: The pull rod further comprises: An annular flange is connected to the end of the deformed portion away from the rod body, and the annular flange is used to abut against the end surface of the valve seat.

7. The valve seat extraction device according to any one of claims 1 to 3, characterized in that: An internal thread is provided on the inner wall of the operating channel, and an external thread is provided on the outer peripheral wall of the lifting rod, and the external thread is threadably connected to the internal thread.

8. The valve seat extraction device according to any one of claims 1 to 3, characterized in that: The valve seat extraction device further comprises: a rotating nut, sleeved on the pull rod and rotatably connected to the pull rod; and The support member is sleeved on the pull rod, and the two opposite end faces of the support member can respectively abut against the end faces of the valve body and the rotating nut to limit the movement of the rotating nut.

9. The valve seat extraction device according to claim 8, characterized in that: The support member is provided with a through hole, the through hole being used for the pull rod to pass through, and the diameter of the through hole is larger than the cross-sectional diameter of the pull rod.

10. The valve seat extraction device according to claim 9, characterized in that: The support member comprises: a supporting portion, wherein the through hole is formed on the supporting portion, and an end surface of the supporting portion is used to abut against an end surface of the rotating nut; and The extension portion is connected to the end of the support portion, and the extension portion is used to abut against the end surface of the valve body.

Images