A split valve replacement tool and use method thereof

Abstract

The present invention belongs to the technical field of pipeline operation equipment, and in particular, relates to a split valve replacement tool. It includes an operating component and a plugging component; the operating component includes an expansion operating cylinder, a tightening operating cylinder, a double-threaded pipe, and a sealing nut; the plugging component includes an expansion rod, a compression ring, an elastomer, and a connector. The split structure of the present invention has a detachable rear-end operating structure that will not hinder the disassembly and assembly of the valve, reducing the operation content, and the front-end plugging component will not be affected. Multiple plugging components can be used in combination, and it can be further applied to various types of pipeline valves, such as natural gas, waterways, and other pipeline structures with different pressure levels and sealing requirements.

Description

Technical Field

[0001] The present invention belongs to the technical field of pipeline operation equipment, and in particular relates to a split valve replacement tool and a use method thereof. Background Art

[0002] With the promotion of gas supply, large-scale gas pipeline networks have been built in various cities and residential areas in China. The basic components of the gas pipeline network are mainly gas pipelines and valves that control each gas pipeline. In order to eliminate safety hazards and improve gas use efficiency, gas supply companies not only need to carry out scientific and reasonable pipeline design, but also need to carry out regular maintenance and inspection after the pipeline construction is completed, and quickly deal with temporary emergencies; generally speaking, gas pipelines are effectively protected and guarded, and generally will not be damaged during daily use. However, valves located between various gas pipelines are more prone to various damages, failures and other problems due to frequent closing operations. Once the valve is damaged, it may cause gas leakage, reduced gas pressure, inconvenience in operation and other problems.

[0003] Therefore, based on the needs of daily practical work, people have proposed various tools for valve replacement to improve the speed and effect of valve replacement. For example, the patent No. 200620155128.6 provides a special tool for valve replacement with gas to improve the efficiency of valve replacement. However, it cannot fully achieve its purpose in actual use. The main reasons are: 1. During the valve disassembly and assembly process, the top pipe 3, the pull rod 4, the nut 7, and the thread 8 need to be always connected to the rear end pipeline of the valve. On the one hand, during the valve disassembly and assembly process, the above 3, 4, 7, and 8 components need to be repeatedly inserted through the valve channel. Each component is very easy to collide and squeeze with the inner side of the valve, resulting in cumbersome disassembly and assembly process, wear of the inner wall of the valve and the sealing ring on the device, frictional heating, and static electricity conduction. 1. The tool needs to rely on the flange and connecting holes on the valve to fix the device for operation, but in fact, the two ends of the existing valves are mostly screw-type structures and cannot be fully used; 2. According to the specifications, the plugging component should be able to stay firmly in the pipe at the rear end of the valve to achieve complete closure, but after the valve in the tool is removed, the rear end jack pipe 3, pull rod 4 and the nuts and threads attached thereto are an integrated structure with the plugging component. After the plugging component is installed, the above structure will extend out of the pipeline. When it is skewed or falls naturally, it will squeeze and pull the plugging component to affect the sealing effect of the plugging component. Therefore, it is necessary to hold the protruding part during operation. Especially when it is used on valves with many pipe openings arranged in a vertical direction, the plugging component is more easily affected. Summary of the invention

[0004] The object of the invention is to provide a split valve replacement tool and a method of using the tool, which has a split structure and can effectively improve the sealing effect of the plugging component and has a simple and quick valve replacement process.

[0005] To achieve the above-mentioned purpose, the invention adopts the following technical solution.

[0006] A split valve replacement tool, comprising an operating assembly and a plugging assembly; the operating assembly comprises an expansion operating cylinder, a tightening operating cylinder, a double threaded pipe, and a sealing nut; the plugging assembly comprises an expansion rod, a compression ring, an elastic body, and a connector;

[0007] The expansion operating rod comprises a vertical rod body, and a polygonal hole is dug at the lower end of the rod body along the axis of the rod body; the expansion operating rod can smoothly penetrate and move through the tightening operating cylinder, and the tightening operating cylinder comprises a cylindrical cylinder body, one end of the cylinder body is provided with an internal thread, and the other end is provided with a sealing member;

[0008] The double-threaded pipe is a cylindrical structure with external threads at both ends. The double-threaded pipe sleeve is arranged outside the tightening operation cylinder. The sealing nut is arranged at the upper end of the double-threaded pipe. The lower end of the sealing nut is provided with an internal thread so that it can be tightened and fixed on the upper end of the double-threaded pipe. The upper end of the sealing nut is provided with a through hole, and the aperture of the through hole is adapted to the diameter of the tightening operation cylinder. A sealing gasket is arranged between the sealing nut and the double-threaded pipe.

[0009] The expansion rod comprises a platform at the top, a threaded rod is arranged at the lower end of the platform, and the end of the threaded rod is a multi-faceted prism, and the shape of the multi-faceted prism is adapted to the polygonal hole so as to be inserted and connected;

[0010] The connecting piece is sleeved on the threaded rod. The connecting piece is a cylindrical structure with threads inside and outside. The upper end of the connecting piece is provided with a blocking part, whose internal threads match the threads on the threaded rod, and whose external threads match the internal threads at the lower end of the fastening operating cylinder. The size of the blocking part is larger than the outer diameter of the fastening operating cylinder, so that the lower end of the connecting piece can be screwed and fixed on the lower end of the fastening operating cylinder without being completely screwed into it.

[0011] A plurality of pairs of compression rings are sleeved on the threaded rod, and an elastic body is arranged between each pair of compression rings; through the relative movement between the platform and the compression ring, the elastic body can be deformed and thickened, thereby clamping the inner wall of the pipeline, so that the blocking component is fixed in the pipeline.

[0012] Further improvements to the aforementioned split valve replacement tool also include that the elastomer is a cylindrical structure, the compression ring is a pancake-shaped structure, grooves are provided on the opposite surfaces of each pair of compression rings, cylindrical bosses are provided at both ends of the elastomer, and the grooves and cylindrical bosses match each other.

[0013] Further improvements to the aforementioned split valve replacement tool include including a plurality of plugging assemblies of different sizes, wherein the diameter of the compression ring and the elastic body in each plugging assembly is smaller than the inner diameter of the corresponding pipe;

[0014] Corresponding to the plugging components of different sizes, the operating component also includes a plurality of double-threaded pipes and sealing nuts with different outer diameters that match the pipe diameters of different valves respectively.

[0015] Further improvements to the aforementioned split valve replacement tool also include an auxiliary nut, one end of which is connected to the double-threaded pipe via a thread, and the other end of which is provided with a thread adapted to the valve pipe; a sealing ring is provided on the contact surface between the auxiliary nut and the double-threaded pipe.

[0016] A further improvement to the aforementioned split valve replacement tool includes that the spacing between the fastening operating cylinder body and the outer wall of the expansion operating rod is (0.05,0.6] mm, and the spacing between the two does not exceed 1 / 20 of the diameter of the expansion operating rod.

[0017] Further improvements to the split valve replacement tool include tightening the length L of the operating cylinder 0 , the length of the expansion operating rod L 2 , the length of the thread at the lower end of the connector L 4 , Length of elastic deformation section of piston assembly L 5 Satisfaction: L 0 <L 2 +L 4 +k; k is the operable distance, which refers to the minimum distance that the plugging component moves along the valve channel to the rear pipeline, and k = S + L 5 , where S is the total length of the front and rear end channels after the valve is connected.

[0018] A further improvement to the aforementioned split valve replacement tool also includes that the upper end of the expansion operating rod is a T-shaped structure or a foldable Z-shaped structure.

[0019] The tightening operation cylinder and the sealing member are an integrated structure. The sealing member is provided with two threaded holes opposite to each other. A short rod is arranged in the threaded holes. The short rod is provided with threads for being screwed into the threaded holes.

[0020] Further improvements to the aforementioned split valve replacement tool also include that the expansion operating rod is a T-shaped structure, the tightening operating cylinder and the sealing member are connected by threads, and two short rods are welded to the sealing member.

[0021] A further improvement to the aforementioned split valve replacement tool also includes that the compression ring is a magnetic compression ring.

[0022] The method of using the split valve replacement tool includes the following steps:

[0023] ①Select appropriate double threaded pipe and plugging components;

[0024] ② Assemble the operating component and the plugging component, and use the external thread at the lower end of the connector to install the plugging component on the operating component.

[0025] Fasten the top of the operating cylinder in the fitting and tighten it;

[0026] ③Hold the tightening operation cylinder and pull the double-thread cylinder and the sealing nut outward until the plugging assembly is completely inserted into the double-thread cylinder.

[0027] Inside the corrugated tube;

[0028] ④ Screw the outer end of the double threaded pipe onto the pipe mouth of the valve, tighten the sealing nut, and make sure that the seal is good.

[0029] Connect the electrostatic wire between the component and the pipeline, open the valve, and confirm that the sealing is good again;

[0030] ⑤ Push the tightening operating cylinder to push the plugging assembly into the appropriate position inside the pipe, push the expansion operating rod so that its top end fits and connects with the multi-faceted prism at the bottom of the expansion rod, rotate the expansion operating rod to move the expansion rod toward the valve and squeeze it

[0031] Elastomer, which thickens the pipe and blocks it;

[0032] ⑤ Rotate the tightening operating cylinder to separate it from the plugging assembly, pull out the expansion operating rod and tighten the operating cylinder to disengage it

[0033] Valve hole, but do not pull out the double threaded pipe, close the valve;

[0034] ⑦ According to actual needs, when multiple plugging components are needed, remove the operating component from the valve, and follow the steps to install the plugging components until all the plugging components are installed; when there are enough plugging components, remove the operating component and valve in turn, install the new valve, install the operating component on the new valve and loosen the plugging components one by one.

[0035] And use the tightening operating cylinder to pull it into the double threaded pipe, close the valve, and remove the blocking assembly.

[0036] Its beneficial effects are:

[0037] 1. Simple structure and fast valve replacement.

[0038] 2. Split structure, the rear end operating structure is detachable and will not hinder the disassembly and assembly of the valve, reducing the operation content, and the front end blocking components will not be affected.

[0039] 3. Multiple plugging components can be used in combination to improve the sealing effect. They can be used to plug pipelines with different pressures, so that they can be further applied to various pipeline valves, such as natural gas, water, and other pipeline structures with different pressure levels and sealing requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 It is a schematic diagram of the structure of the split valve replacement tool;

[0041] Figure 2 It is a schematic diagram (including section) of the structure of the operating components in the split valve replacement tool;

[0042] Figure 3 is a schematic diagram of the structure of the plugging assembly in the split valve replacement tool;

[0043] Figure 4 It is a schematic diagram of the internal structure of the plugging assembly in the split valve replacement tool;

[0044] Figure 5 It is a schematic diagram of the first structure of the auxiliary nut;

[0045] Figure 6 It is a second structural schematic diagram of the auxiliary nut;

[0046] Figure 7 This is the assembly structure diagram of the split valve replacement tool;

[0047] Figure 8 Schematic diagram of an implementation of a split valve replacement tool. DETAILED DESCRIPTION

[0048] The invention is described in detail below in conjunction with specific embodiments.

[0049] like Figure 1 , Figure 2 As shown, a split valve replacement tool includes an operating component 1 and a plugging component 2; the operating component includes an expansion operating cylinder 11, a tightening operating cylinder 12, a double threaded tube 13, and a sealing nut 14; the plugging component 2 includes an expansion rod 21, a compression ring 22, an elastomer 23, and a connector 24.

[0050] In this embodiment, the plugging component 2 is retained inside the pipeline for closed isolation to facilitate replacement and maintenance of the valve. The operating component 1 is used to deliver the plugging component 2 to the corresponding position while ensuring the sealing between the structures during the installation process. The two parts are independent of each other and are only connected to each other when the plugging component is installed and removed. Therefore, the plugging component stays independently inside the pipeline during the valve replacement process, completely isolated from external interference, and does not need to be operated. Even if the valve is not replaced temporarily, there is no need to worry about shaking and leakage caused by external force. No additional fixing operation is required during the operation, which greatly simplifies the work content of valve replacement and improves the sealing performance.

[0051] The expansion operation rod 11 includes a vertical rod 11a, and a polygonal hole 11b is dug at the lower end of the rod 11a along the axis of the rod; the expansion operation rod 11 can smoothly penetrate and move through the tightening operation cylinder 12, and the tightening operation cylinder 12 includes a cylindrical cylinder body 12a, one end of the cylinder body 12a is provided with an internal thread 12b to be connected to the plugging component 2, and the other end is provided with an external thread and a sealing member 15 to keep the tightening operation cylinder 12 and the expansion operation rod 11 sealed; double thread The tube 13 is a cylindrical structure with external threads at both ends. The double-threaded tube 13 is sleeved on the outside of the fastening operation tube 12. The sealing nut 14 is arranged on the upper end of the double-threaded tube 13. The lower end of the sealing nut 14 is provided with an internal thread 14a so that it can be tightened and fixed on the upper end of the double-threaded tube 13. The upper end of the sealing nut 14 is provided with a through hole 14b, and the aperture of the through hole 14b is adapted to the diameter of the fastening operation tube 12; a sealing gasket 3 is arranged between the sealing nut 14 and the double-threaded tube 13.

[0052] In this embodiment, the expansion operating rod is a Z-shaped crank-like structure, so that it is easy to rotate and operate it, saving effort. It can also be designed as a T-shaped structure. In particular, in the actual operation process, due to the limitation of the space where the valve is located or the pipeline, the available operating space for the expansion operating rod is insufficient, which may hinder its use. For this reason, the crank of the expansion operating rod can be set to a foldable structure, that is, a foldable structure is set at the position of the expansion operating rod close to the axis, for example, using a pin connection method, and using an angle spring to control the angle of the crank when necessary.

[0053] In order to facilitate the rotation and tightening of the operating cylinder, the seal and the tightening operating cylinder can be set as an integrated or split structure, and the split structure is preferably threaded. Similarly, in the actual operation process, in order to facilitate the rotation of the seal and the operation of the tightening operating cylinder, a short rod can be welded on the seal to facilitate its operation; in particular, in order to reduce the operating space and compress the tool volume for easy storage and use, the short rod can be set as a detachable structure, that is, a threaded hole 15a is set on the seal, and a thread is set on the short rod, and a threaded connection is used. Usually, it is better to use an integrated structure with a detachable short rod, or a split structure with a welded non-detachable screw rod, so that the number of parts is small after the tool is disassembled and the equipment volume is small.

[0054] like Figure 3 , Figure 4 As shown, the expansion rod 21 includes a platform 21a at the top, a threaded rod 21b is provided at the lower end of the platform 21a, and the end of the threaded rod 21b is a multi-faceted prism 21c, and the shape of the multi-faceted prism 21c is adapted to the polygonal hole 11b so as to be inserted and connected; it is easy to know that the size of the platform 21a should be smaller than the inner diameter of the pipe;

[0055] The connecting member 24 is sleeved on the threaded rod 21b. The connecting member 24 is a cylindrical structure with threads inside and outside. The upper end of the connecting member 24 is provided with a blocking portion 24a, whose internal threads match the threads on the threaded rod 21b, and whose external threads match the internal threads 12b at the lower end of the tightening operation cylinder 12; the size of the blocking portion is larger than the outer diameter of the tightening operation cylinder 12, so that the lower end of the connecting member 24 can be screwed and fixed to the lower end of the tightening operation cylinder 12 without being completely screwed into it;

[0056] A plurality of pairs of compression rings 22 are sleeved on the threaded rod 21b, and an elastic body 23 is arranged between each pair of compression rings 22; through the relative movement between the platform 21a and the compression ring 22, the elastic body 23 can be deformed and thickened, thereby clamping the inner wall of the pipeline, so that the plugging component 2 is fixed in the pipeline;

[0057] Furthermore, in order to improve the sealing of the wall and increase the friction between the blocking component 2 and the inner wall of the pipe, so as to avoid the accidental ejection of the blocking component when the pressure suddenly changes, the compression ring is made of a magnetic material in this embodiment. The magnetic compression ring can generate attraction with the inner wall of the pipe to prevent the blocking component from being easily squeezed out of the pipe. In the specific implementation process, the safety can also be improved by setting and installing multiple blocking components.

[0058] In this embodiment, the elastomer 23 is a cylindrical structure. In order to ensure that the relative positions of the compression ring 22 and the elastomer 23 remain unchanged and that they can evenly clamp the inner wall of the pipe, the compression ring 22 is configured as a pancake structure, and grooves 22b are provided on the opposite surfaces of each pair of compression rings 23, and cylindrical bosses 23b are provided at both ends of the elastomer 23. The grooves 22b and the cylindrical bosses 23b match each other. During the deformation and compression of the elastomer, the compression ring 22 and the elastomer 23 remain coaxial, ensuring that the compression ring 22 and the elastomer 23 move along the axis of the threaded rod 21b; based on the above structure, it can be ensured that the axis of the elastomer 23 is always parallel to the axis of the threaded rod 21b during the compression process, avoiding skewing to both sides, so that the elastomer is evenly stressed and deformed, thereby improving the sealing effect.

[0059] Based on actual needs, the gas pipeline network contains valves of various sizes to be connected to pipelines of different diameters. To meet the needs of replacing valves of different sizes, the present invention includes a plurality of plugging components 2 of different sizes. The diameters of the compression ring 22 and the elastic body 23 in each plugging component 2 are slightly smaller than the inner diameter of the corresponding pipeline. Corresponding to the plugging components 2 of different sizes, the operating component 1 also includes a plurality of double-threaded pipes 13 and sealing nuts 14 of different outer diameters that match the pipe diameters of different valves respectively.

[0060] In actual operation, many valves are installed inside underground pipes at a certain height below the ground level, and water often accumulates in the pipes with only the valve structure exposed. To facilitate operation, the double-threaded pipe 13 is configured with multiple different lengths to enable remote operation.

[0061] Another solution is to add an auxiliary nut 6, one end of which is connected to the double-threaded pipe 13 through a thread 6a, and the other end of which is provided with a thread 6b adapted to the valve pipe. In the specific implementation process, the following steps are included: Figure 5 and Figure 6 There are two specific structural types. The use of auxiliary nuts 6 is beneficial to improving the efficiency of tool use and avoiding repeated plugging and unplugging operations during the disassembly and assembly of double-threaded tubes 13. During maintenance and inspection, auxiliary nuts 6 with smaller mass and volume can be carried without carrying multiple double-threaded tubes 13. In particular, in order to improve the sealing performance, a sealing ring 6c is provided on the contact surface between the auxiliary nut 6 and the double-threaded tube.

[0062] For easy operation, a groove 13a or anti-slip pattern is provided in the middle of the double threaded pipe;

[0063] It is easy to know that the inner diameter of the barrel is larger than the diameter of the expansion operating rod. Furthermore, in order to prevent excessive friction on the surface and ensure that the expansion operating rod does not shake or tilt excessively during use, the distance between the barrel of the tightening operating barrel and the outer wall of the expansion operating rod is (0.05,0.6] mm, and the distance between the two does not exceed 1 / 20 of the diameter of the expansion operating rod;

[0064] like Figure 7 As shown, in order to meet the actual use requirements and ensure that the plugging assembly can be fully extended into the pipe at the rear end of the valve, the length L of the tightening operating cylinder is 0 , the length of the double threaded pipe L 1 , the length of the expansion operating rod L 2 , the length L of the thread at the lower end of the connector 24 4 , Length of elastic deformation section of piston assembly L 5 Satisfaction: L 0 <L 2 +L 4 +k, where k is the operable distance, which refers to the minimum distance that the plugging component moves along the valve channel to the rear pipeline and k = S + L 5 , where S is the total length of the front and rear end channels after the valve is connected.

[0065] like Figure 8 As shown, the specific steps of using the split valve replacement tool include:

[0066] 1. Select the appropriate double threaded pipe 13 and plugging assembly 2

[0067] 2. Assemble the operating assembly 1 and the plugging assembly 2, and use the external thread at the lower end of the connecting piece 24 to install the plugging assembly 2 in the operating assembly 1 to tighten the top of the operating cylinder 12;

[0068] 3. Hold the tightening operation cylinder 12, and pull the double-threaded cylinder 13 and the sealing nut 14 outward until the plugging component 2 is completely inserted into the double-threaded tube 13;

[0069] 4. Screw the outer end of the double-threaded pipe 13 onto the pipe mouth of the valve, tighten the sealing nut 14, confirm that the seal is good, connect the electrostatic wire between the operating component 1 and the pipe B, open the valve, and confirm that the seal is good again;

[0070] 5. Push the tightening operating cylinder 12 to push the blocking component 2 into the appropriate position inside the pipe B, push the expansion operating rod 11 so that its top end fits and connects with the multifaceted prism 21c at the lower end of the expansion rod 21, rotate the expansion operating rod 11 to move the expansion rod 21 toward the valve direction to squeeze the elastic body 23, making it thicker and then blocking the pipe B;

[0071] 6. Rotate and tighten the operating cylinder 12 to separate it from the plugging assembly, pull out the expansion operating rod 11 and the tightening operating cylinder 12 to separate it from the valve channel, but do not pull out the double threaded tube 13, and close the valve;

[0072] 7. According to actual needs, when multiple plugging components 2 are needed, remove the operating component 1 from the valve, and assemble and install the plugging components 2 according to steps 1-5 until all the plugging components are installed; when the plugging components 2 are sufficient, remove the operating component 1 and the valve in turn, install a new valve, install the operating component 1 on the new valve and loosen the plugging components one by one, and use the tightening operating cylinder 12 to pull them into the double threaded pipe 13, close the valve, and remove the plugging component 2.

[0073] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the invention, rather than to limit the scope of protection of the invention. Although the invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the invention can be modified or replaced by equivalents without departing from the essence and scope of the technical solution of the invention.

Claims

1. A split valve replacement tool, characterized in that: It includes an operating assembly and a plugging assembly; the operating assembly includes an expansion operating cylinder, a tightening operating cylinder, a double threaded pipe, and a sealing nut; the plugging assembly includes an expansion rod, a compression ring, an elastomer, and a connector; The expansion operation rod comprises a vertical rod body, and a polygonal hole is dug at the lower end of the rod body along the axis of the rod body; the expansion operation rod can smoothly penetrate and move through the tightening operation cylinder, and the tightening operation cylinder comprises a cylindrical cylinder body, one end of the cylinder body is provided with an internal thread, and the other end is provided with a sealing member; the double-threaded tube is a cylindrical structure with external threads at both ends, the double-threaded tube sleeve is arranged outside the tightening operation cylinder, the sealing nut is arranged at the upper end of the double-threaded tube, and the lower end of the sealing nut is provided with an internal thread so as to be tightened and fixed to the upper end of the double-threaded tube; the upper end of the sealing nut is provided with a through hole, and the aperture of the through hole is adapted to the diameter of the tightening operation cylinder; a sealing gasket is arranged between the sealing nut and the double-threaded tube; The expansion rod comprises a platform at the top, a threaded rod is arranged at the lower end of the platform, and the end of the threaded rod is a multi-faceted prism, and the shape of the multi-faceted prism is adapted to the polygonal hole so as to be inserted and connected; The connecting piece is sleeved on the threaded rod. The connecting piece is a cylindrical structure with threads inside and outside. The upper end of the connecting piece is provided with a blocking part, whose internal threads match the threads on the threaded rod, and whose external threads match the internal threads at the lower end of the fastening operating cylinder. The size of the blocking part is larger than the outer diameter of the fastening operating cylinder, so that the lower end of the connecting piece can be screwed and fixed on the lower end of the fastening operating cylinder without being completely screwed into it. A plurality of pairs of compression rings are sleeved on the threaded rod, and an elastic body is arranged between each pair of compression rings; The elastic body is a cylindrical structure, the compression ring is a pancake structure, grooves are arranged on the opposite surfaces of each pair of compression rings, cylindrical bosses are arranged at both ends of the elastic body, and the grooves and cylindrical bosses match each other; Also included are a plurality of plugging assemblies of different sizes, wherein the diameter of the compression ring and the elastic body in each plugging assembly is smaller than the inner diameter of the corresponding pipe; Corresponding to the plugging components of different sizes, the operating component also includes a plurality of double-threaded pipes and sealing nuts with different outer diameters that match the pipe diameters of different valves respectively.

2. A split valve replacement tool according to claim 1, characterized in that: It also includes an auxiliary nut, one end of which is connected to the double-threaded pipe through a thread, and the other end of which is provided with a thread adapted to the valve pipeline; a sealing ring is provided on the contact surface between the auxiliary nut and the double-threaded pipe.

3. A split valve replacement tool according to claim 1, characterized in that: The distance between the tightening operating cylinder and the outer wall of the expansion operating rod is (0.05,0.6] mm, and the distance between the two does not exceed 1 / 20 of the diameter of the expansion operating rod.

4. A split valve replacement tool according to claim 1, characterized in that: The length L0 of the tightening operating cylinder, the length L2 of the expansion operating rod, the length L4 of the lower end thread of the connecting piece, and the length L5 of the elastic deformation section of the piston assembly satisfy: L0<L2+L4+k; where k is the operable distance, which refers to the minimum distance when the blocking assembly moves along the valve channel to the rear end pipeline and k=S+L5, where S is the total length of the front and rear end channels after the valve is connected.

5. A split valve replacement tool according to claim 1, characterized in that: The upper end of the rod body of the expansion operating rod is a T-shaped structure or a foldable Z-shaped structure; the tightening operating cylinder and the sealing member are an integrated structure, and the sealing member is provided with two threaded holes opposite to each other, and a short rod is arranged in the threaded hole, and the short rod is provided with threads to be screwed into the threaded hole.

6. A split valve replacement tool according to claim 1, characterized in that: The expansion operating rod is a T-shaped structure; the fastening operating cylinder and the sealing member are connected via threads, and two short rods are welded on the sealing member.

7. A split valve replacement tool according to claim 1, characterized in that: The compression ring is a magnetic compression ring.

8. A method for using the split valve replacement tool according to claim 1, characterized in that: The steps include: ①Select appropriate double threaded pipe and plugging components; ② Assemble the operating assembly and the plugging assembly, use the external thread at the lower end of the connector to install the plugging assembly in the operating assembly, tighten the top of the operating cylinder; ③Hold the tightening operation cylinder and pull the double-threaded cylinder and the sealing nut outward until the plugging assembly is completely inserted into the double-threaded tube; ④ Tighten the outer end of the double-threaded pipe onto the pipe mouth of the valve, tighten the sealing nut, confirm that the seal is good, connect the electrostatic wire between the operating component and the pipeline, open the valve, and confirm that the seal is good again; ⑤ Push the tightening operating cylinder to push the blocking component into the appropriate position inside the pipeline, push the expansion operating rod so that its top end fits and connects with the multi-faceted prism at the bottom of the expansion rod, rotate the expansion operating rod to move the expansion rod toward the valve to squeeze the elastic body, making it thicker and then blocking the pipeline; ⑥ Rotate and tighten the operating cylinder to separate it from the blocking component, pull out the expansion operating rod and tighten the operating cylinder to separate it from the valve channel, but do not pull out the double threaded pipe, and close the valve; ⑦ When multiple plugging components are needed, remove the operating component from the valve and assemble and install the plugging components according to steps ①-⑤ until all the plugging components are installed; when there are enough plugging components, remove the operating component and valve in turn, install the new valve, install the operating component on the new valve and loosen the plugging components one by one, use the tightening operating cylinder to pull it into the double threaded pipe, close the valve, and remove the plugging component.

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