Fake valve structure for large pipeline and valve mounting method

Abstract

The invention relates to the technical field of pipeline connection, in particular to a dummy valve structure for a large pipeline and a valve mounting method.The dummy valve structure for the large pipeline comprises two oppositely-arranged mounting plates, and the mounting plates are connected through at least one connecting rod; a plurality of bolt holes are formed in the mounting plate, and the mounting plate is detachably connected between two adjacent mounted pipelines through the bolt holes. According to the false valve structure, the adjacent pipelines are fixedly connected in advance through the two oppositely-arranged mounting plates and the connecting rod, and when the mounting position of a valve or a telescopic joint is reserved in a large pipeline, the mounting environment of the actual valve can be simulated in advance. By means of the structure, the axial and radial positions of the pipeline port can be effectively fixed, the pipeline port is prevented from deviating in the construction period, the error problem generated when a valve or a telescopic joint is finally installed is reduced, the butt joint precision is improved, and smooth proceeding of follow-up construction is guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of pipeline connection, and particularly relates to a dummy valve structure for large pipelines and a valve installation method. Background Art

[0002] A seawater cooling system is a cooling system that uses seawater as a cooling medium and is widely used in industrial facilities such as power plants, chemical plants, and refineries that require a large amount of heat exchange.

[0003] A large seawater cooling system needs to draw seawater from the ocean, cool and exchange heat, and then discharge it back into the sea. Therefore, various complex large pipelines (with a pipe diameter between 2000 mm and 4000 mm and a pipeline length exceeding 1000 m) need to be arranged to meet the intake and drainage requirements of the entire system. During the construction of large pipelines, the installation of a large number of valves and expansion joints is often involved. Due to the long pipeline length and wide construction scope, it is difficult to complete the installation of all valves and expansion joints in one construction. Therefore, in order to improve the construction efficiency, it is necessary to first construct the pipe body of the large pipeline, reserve the installation positions of the valves and expansion joints in advance, and then install the valves or expansion joints after the large pipeline is installed and the pressure test is completed. However, this construction method often results in large errors (including axial error and radial error) when finally docking the valves or expansion joints with the large pipelines at both ends, making it difficult to dock the valves or expansion joints with the large pipelines at both ends and affecting the construction efficiency. Summary of the Invention

[0004] The purpose of the present invention is to overcome the deficiencies of the existing large pipeline construction method of reserving the valve installation position, which has large errors when finally installing the valve, difficult docking of the valve with the pipelines at both ends, and affects the construction efficiency, and provide a dummy valve structure for large pipelines and a valve installation method.

[0005] In a first aspect, the present invention provides a dummy valve structure for large pipelines, including two oppositely arranged mounting plates, and at least one connecting rod is connected between the mounting plates; a plurality of bolt holes are formed in the mounting plates, and the mounting plates are detachably connected between two adjacent installed pipelines through the bolt holes.

[0006] The dummy valve structure for large pipelines provided by the present invention pre-fixes and connects adjacent pipelines through two oppositely arranged mounting plates and connecting rods, and can simulate the actual valve installation environment in advance when reserving the valve or expansion joint installation position in the large pipeline. This structure can effectively fix the axial and radial positions of the pipeline ports, prevent the pipeline ports from shifting during construction, reduce the error problem when finally installing the valve or expansion joint, improve the docking accuracy, and ensure the smooth progress of subsequent construction.

[0007] The dummy valve structure can be quickly installed and disassembled through a detachable design. During construction, the dummy valve structure can be installed first to fix and test the pipeline to ensure that the size and position accuracy of the reserved position are correct. After the construction of all pipelines and valve wells is completed, the dummy valve structure can be disassembled and the formal valve or expansion joint can be installed, which effectively avoids the rework problem caused by insufficient accuracy of the reserved position, saves construction time, and greatly improves construction efficiency.

[0008] The fake valve structure adopts a combination design of a mounting plate and a connecting rod. The structural design is simple and convenient for prefabrication on the construction site. The length of the connecting rod can be flexibly selected according to the size of different valves or expansion joints, so that the pipeline in the reserved position can maintain good stability during construction. Especially in long-distance pipeline construction, it can effectively avoid deformation or displacement of the pipeline port due to external force or temperature changes.

[0009] Preferably, the bolt holes are configured to have at least three different hole diameters, and the distances between the bolt holes and the center of the mounting plate are configured to have at least three different distances.

[0010] The multi-aperture and multi-hole spacing design of the bolt holes makes the fake valve structure compatible with bolts and pipe flanges of various specifications, and can flexibly respond to the diverse needs of complex construction sites. When in use, it is only necessary to adjust the length of the connecting rod according to the size of the valve or expansion joint, avoiding the need to design separate mounting plates for different pipe diameters, thereby simplifying the processing and production process of parts, reducing manufacturing costs, and effectively improving the versatility and adaptability of the fake valve structure.

[0011] Preferably, the connecting rod is arranged between each adjacent bolt hole.

[0012] Connecting rods are set between each adjacent bolt hole to form a uniform force frame. This can not only effectively improve the rigidity of the false valve structure, but also resist deformation caused by vibration, impact or temperature difference during external construction, ensuring the stability of the entire structure.

[0013] Preferably, the connecting rod is an I-beam.

[0014] For large pipelines, the "I"-shaped cross-section of the I-beam provides greater bending rigidity than ordinary steel, making it more difficult for the connecting rod to bend or twist when subjected to external forces, further enhancing the stability of the false valve structure and ensuring the accuracy of pipeline docking and the reliability of the installation process.

[0015] Preferably, the connecting rod is a round steel pipe with a diameter of 200mm-250mm.

[0016] Compared with solid steel, circular steel pipes can reduce the weight of the connecting rod while ensuring strength. This helps reduce the need for heavy machinery and equipment during construction, decreases construction difficulty and costs, and avoids the additional burden on pipelines and construction equipment caused by overweight components.

[0017] Preferably, the number of the connecting rods is one, and the connecting rod is installed at the center of the mounting plate.

[0018] Setting only one connecting rod at the center position of the mounting plate can simplify the design and manufacturing process of the false valve structure. Compared with multiple connecting rods, it reduces material consumption and processing costs and speeds up the construction progress.

[0019] Preferably, a stiffening rib is arranged between the connecting rod and the mounting plate, and the stiffening rib is used to enhance the connection stability between the connecting rod and the mounting plate.

[0020] By adding additional support between the connecting rod and the mounting plate through the stiffening rib, the connection strength and stability between the two can be effectively improved. Especially in harsh environments with strong winds and sand and large temperature differences, when the pipeline system is under great pressure or external force, the stiffening rib can effectively disperse the pressure and prevent the connection part from deforming or failing due to excessive local stress. The setting of the stiffening rib makes the connection between the connecting rod and the mounting plate more firm, ensuring that the false valve structure can still maintain stability under high loads, long-term use or complex environments.

[0021] In a second aspect, the present invention provides a valve installation method using the above false valve structure for large pipelines, including the following steps:

[0022] S1: According to the size and quantity of the valve to be installed, prefabricate the false valve structure for large pipelines with matching size and quantity;

[0023] S2: Conduct mechanical wire laying to determine the installation position and direction of the valve to be installed;

[0024] S3: Construct the valve well and pipeline, and hoist the false valve structure for large pipelines to the corresponding position of the valve to be installed for pre-installation of the false valve structure;

[0025] S4: After all pipelines and valve wells are constructed, disassemble the false valve structure for large pipelines and install the corresponding valve.

[0026] The valve installation method provided by the present invention uses the dummy valve structure for large pipelines provided by the present invention to occupy the position of the valve to be installed in advance during pipeline construction. The dummy valve structure plays a positioning role during the construction of large pipelines, which can effectively alleviate the problem of error accumulation caused by the long pipeline length or complex on-site conditions, ensure smooth docking during valve installation, and avoid axial or radial misalignment. After all pipelines and valve wells are constructed, the dummy valve structure is disassembled to achieve precise installation of the valve and reduce installation problems caused by on-site positioning errors.

[0027] The valve installation method provided by the present invention places the valve installation steps at the back, decomposes the construction of pipelines and valves into two independent stages, and installs the valves uniformly after all pipelines are installed, avoiding inefficiencies or operational errors caused by multiple tasks being carried out simultaneously, effectively reducing rework problems caused by inaccurate valve positioning, reducing waste of construction materials and labor, and greatly improving construction efficiency.

[0028] Preferably, in S1, according to the size of the valve to be installed, the length of the connecting rod is selected, and the sum of the length of the connecting rod and the thickness of the mounting plates at both ends matches the size of the valve to be installed.

[0029] By adjusting the length of the connecting rod to strictly match the valve size, the installation position of the valve can be accurately reserved during the pipeline construction stage, ensuring that the dummy valve structure can accurately reflect the actual size requirements of the valve after installation, effectively eliminating the docking difficulties caused by deviation in valve size reservation or calculation errors, and ensuring the smoothness and accuracy of subsequent valve installation.

[0030] Preferably, in S3, when hoisting the dummy valve structure for large pipelines, at least two lifting points are provided at the top of each mounting plate, and a towing rope is sleeved on the connecting rod near the bottom, and the bottom position of the dummy valve structure for large pipelines is controlled by dragging the towing rope.

[0031] The combination of the lifting points and the towing rope can achieve precise control of the position of the dummy valve structure during hoisting, especially the bottom position, quickly adjust the alignment state between the dummy valve structure and the pipeline interface, avoid the risk of repeated adjustment and collision between the dummy valve structure and the pipeline, and improve construction efficiency.

[0032] Compared with the prior art, the beneficial effects of the present invention are:

[0033] 1. The dummy valve structure for large pipelines provided by the present invention pre - fixes and connects adjacent pipelines through two oppositely arranged mounting plates and connecting rods. When reserving the installation positions for valves or expansion joints in large pipelines, it can simulate the actual valve installation environment in advance. This structure can effectively fix the axial and radial positions of the pipeline ports, prevent the pipeline ports from shifting during construction, reduce the error problems during the final installation of valves or expansion joints, improve the docking accuracy, and ensure the smooth progress of subsequent construction.

[0034] 2. The valve installation method provided by the present invention uses the dummy valve structure for large pipelines provided by the present invention to occupy the position of the valve to be installed in advance during pipeline construction. The dummy valve structure plays a positioning role during the large - pipeline construction process, can effectively alleviate the problem of error accumulation caused by the long pipeline length or complex on - site conditions, ensure smooth docking during valve installation, and avoid axial or radial misalignment. After all pipelines and valve wells are constructed, the dummy valve structure is disassembled to achieve the precise installation of the valve, reducing installation problems caused by on - site positioning errors. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a schematic structural diagram of the dummy valve structure for large pipelines using I - shaped steel as the connecting rod;

[0036] Figure 2 It is a schematic structural diagram of the dummy valve structure for large pipelines using circular steel pipes as the connecting rod;

[0037] Figure 3 It is a schematic diagram when the dummy valve structure for large pipelines is connected to the pipelines already installed at both ends;

[0038] Figure 4 It is a schematic diagram of the mounting plate structure in Embodiment 2;

[0039] Figure 5 It is a schematic structural diagram of the dummy valve structure for large pipelines provided in Embodiment 6;

[0040] Figure 6 It is a schematic diagram when stiffening ribs are arranged between the connecting rod and the mounting plate.

[0041] Markings in the figure:

[0042] 1 - mounting plate, 2 - connecting rod, 3 - bolt hole, 4 - stiffening rib, 100 - pipeline already installed. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0043] The present invention will be further described in detail below with reference to specific embodiments. However, this should not be construed as limiting the scope of the above - mentioned subject matter of the present invention to the following embodiments. All technologies implemented based on the content of the present invention fall within the scope of the present invention.

[0044] Unless otherwise specified, in the description of the specific embodiments of the present invention, the expression terms indicating the orientation or positional relationship such as "upper", "lower", "left", "right", "center", "inner", "outer", etc. are all based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship when the invention product / device / equipment is usually used. These terms of orientation or positional relationship are only for the convenience of describing the solution of the present invention or simplifying the description in the specific embodiments, so as to facilitate technicians to quickly understand the solution, rather than indicating or implying that a specific device / component / element must have a specific orientation, or be constructed and operated in a specific positional relationship. Therefore, it should not be construed as a limitation to the present invention.

[0045] In addition, if terms such as "horizontal", "vertical", "hanging", "parallel" appear, it does not mean that the corresponding device / component / element is required to be absolutely horizontal or vertical or hanging or parallel, but can be slightly inclined or have a deviation. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined. Or, it can be simply understood that the corresponding device / component / element is arranged in the directions of "horizontal", "vertical", "hanging", "parallel", etc., and can have an error / deviation of ±10% relative to the corresponding direction setting, more preferably within ±8%, more preferably within ±6%, more preferably within ±5%, more preferably within ±4%. As long as the corresponding device / component / element is within the error / deviation range, it can still play its role in the solution of the present invention.

[0046] In addition, the expressions such as "first", "second", "third", etc. in the terms are only used to distinguish the description of the same or similar components, and should not be understood as emphasizing or implying the relative importance of a specific component.

[0047] In addition, in the description of the embodiments of the present invention, "several", "multiple", "a number of" represent at least 2. It can be any situation such as 2, 3, 4, 5, 6, 7, 8, 9, etc., or even more than 9.

[0048] In addition, in the description of the technical solution of the present invention, unless otherwise clearly specified / defined / restricted, where terms such as "set", "installed", "connected", "connected", "provided with", "laid", "arranged" appear, they should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection. It can be connection means commonly used in the art such as welding, riveting, bolting, threaded connection, etc. This connection can be a mechanical connection, an electrical connection or a communication connection; it can be directly connected, or indirectly connected through an intermediate medium, and can be the communication inside two elements.

[0049] Embodiment 1

[0050] As Figure 1 , Figure 2 , Figure 3 shown, this embodiment provides a dummy valve structure for large pipelines, which is used to occupy the valve installation position in advance during the installation of large pipelines (with a pipe diameter between 2000 mm and 4000 mm and a pipeline length exceeding 1000 m) to ensure the smooth installation of subsequent valves.

[0051] Specifically, the dummy valve structure for large pipelines provided in this embodiment includes two oppositely arranged mounting plates 1, the mounting plates 1 are parallel to each other, and at least one connecting rod 2 is connected between the mounting plates 1. The two ends of the connecting rod 2 and the mounting plates 1 can be welded. In this embodiment, the mounting plates 1 can be circular or rectangular steel blind plates.

[0052] A number of bolt holes 3 are opened in the mounting plates 1, and the positions of the bolt holes 3 correspond to the flange hole positions of the installed pipelines 100 on both sides of the installation position to be installed. The mounting plates 1 are detachably connected between two adjacent installed pipelines 100 through the bolt holes 3.

[0053] Furthermore, as Figure 6 shown, in this embodiment, a stiffening rib 4 can be provided between the connecting rod 2 and the mounting plate 1. Specifically, the stiffening rib 4 can be a triangular steel plate as Figure 6 shown. The stiffening rib 4 is used to improve the connection stability between the connecting rod 2 and the mounting plate 1. By adding additional support between the connecting rod 2 and the mounting plate 1 through the stiffening rib 4, the connection strength and stability between the two can be effectively improved. Especially in harsh environments with a lot of sand and dust and large temperature differences, when the pipeline system is under greater pressure or external force, the stiffening rib 4 can effectively disperse the pressure and prevent the connection part from deforming or failing due to excessive local stress. The setting of the stiffening rib 4 makes the connection between the connecting rod 2 and the mounting plate 1 more firm, ensuring that the dummy valve structure can still maintain stability under high load, long-term use or complex environments.

[0054] The dummy valve structure for large pipelines provided in this embodiment pre-fixes and connects adjacent pipelines through two oppositely arranged mounting plates 1 and at least one connecting rod 2. When reserving the installation position of the valve or expansion joint in the large pipeline, it can simulate the actual valve installation environment in advance. This structure can effectively fix the axial and radial positions of the pipeline ports, prevent the pipeline ports from shifting during construction, reduce the error problem during the final installation of the valve or expansion joint, improve the docking accuracy, and ensure the smooth progress of subsequent construction.

[0055] This dummy valve structure realizes rapid installation and disassembly through a detachable design (such as bolt connection between the mounting plate 1 and the flange of the installed pipeline 100). During construction, for example Figure 3As shown, the dummy valve structure can be installed first for pipeline fixing and testing to ensure that the dimensions and position accuracy of the reserved position are correct. After the construction of all pipelines and valve wells is completed, the dummy valve structure is disassembled and the formal valve or expansion joint is installed, effectively avoiding the rework problem caused by insufficient accuracy of the reserved position, saving construction time and greatly improving construction efficiency.

[0056] The dummy valve structure adopts a combined design of the mounting plate 1 and the connecting rod 2. The structure design is simple and convenient for on-site prefabrication. The length of the connecting rod 2 can be flexibly selected according to the dimensions of different valves or expansion joints, so that the pipeline at the reserved valve position can maintain good stability during construction. Especially in the construction of long-distance pipelines, it can effectively avoid the deformation or displacement of the pipeline port caused by external force or temperature change.

[0057] Embodiment 2

[0058] Based on Embodiment 1, in this embodiment, the bolt holes 3 on the mounting plate 1 are optimized. Specifically, as Figure 4 shown, the bolt holes 3 are configured with at least three different hole diameters. For example, Figure 4 the hole diameters D1, D2, and D3 in Figure 4 are all different. The distances from the bolt holes 3 to the center of the mounting plate 1 are configured with at least three different distances. For example,

[0059] Embodiment 3

[0060] Based on Embodiment 1, in this embodiment, the position of the connecting rod 2 is optimized. Specifically, as Figure 1 , Figure 2 shown, eight bolt holes 3 are evenly distributed on the circular mounting plate 1, and a connecting rod 2 is arranged between each adjacent bolt hole 3, that is, eight connecting rods 2 can be arranged. A connecting rod 2 is arranged between each adjacent bolt hole 3 to form a uniform stress frame. This can not only effectively improve the rigidity of the dummy valve structure in this embodiment, but also resist the deformation caused by vibration, impact or temperature difference during the external construction process, ensuring the stability of the entire structure.

[0061] Embodiment 4

[0062] Based on Embodiment 1, as Figure 1As shown, in this embodiment, an I-beam is used as the connecting rod 2. For large pipelines, the "I"-shaped cross-section of the I-beam provides greater flexural stiffness than ordinary steel, making it more difficult for the connecting rod 2 to bend or twist when subjected to external forces, further enhancing the stability of the false valve structure and ensuring the pipeline docking accuracy and the reliability of the installation process.

[0063] Embodiment 5

[0064] Based on Embodiment 1, as Figure 2 shown, in this embodiment, a circular steel pipe with a diameter of 200 mm - 250 mm is used as the connecting rod 2. Compared with solid steel, the circular steel pipe can reduce the weight of the connecting rod 2 while ensuring strength, which helps to reduce the demand for heavy machinery and equipment during the construction process, reduce the construction difficulty and cost, and at the same time avoid the additional burden on the pipeline and construction equipment caused by overweight components.

[0065] Embodiment 6

[0066] Based on Embodiment 1, as Figure 5 shown, in this embodiment, only one connecting rod 2 is provided. Specifically, a rectangular steel pipe can be used as the connecting rod 2, and in this embodiment, the connecting rod 2 can be installed at the center position of the mounting plate 1. Installing only one connecting rod 2 at the center position of the mounting plate 1 can simplify the design and manufacturing process of the false valve structure. Compared with multiple connecting rods 2, it reduces material consumption and processing costs and speeds up the construction progress.

[0067] Embodiment 7

[0068] This embodiment provides a valve installation method. This valve installation method uses the false valve structure for large pipelines in any one of Embodiments 1 - 6. This valve installation method includes the following steps:

[0069] S1: According to the size and quantity of the valve to be installed, prefabricate a false valve structure for large pipelines with matching size and quantity.

[0070] Specifically, the length of the connecting rod 2 can be selected according to the size of the valve to be installed. The sum of the length of the connecting rod 2 and the thickness of the two end mounting plates 1 matches the size of the valve to be installed. By adjusting the length of the connecting rod 2 to make it strictly match the valve size, the installation position of the valve can be accurately reserved during the pipeline construction stage, ensuring that the false valve structure can accurately reflect the actual size requirements of the valve after installation, effectively eliminating the docking difficulties caused by valve size reservation deviation or calculation errors, and ensuring the smoothness and accuracy of subsequent valve installation.

[0071] S2: Conduct mechanical line laying to determine the installation position and direction of the valve to be installed;

[0072] S3: Construct the valve well and pipelines according to the design requirements. Lift the dummy valve structure for large pipelines to the corresponding valve position to be installed for pre-installation of the dummy valve structure. When lifting the dummy valve structure for large pipelines, at least two lifting points are provided at the top of each mounting plate 1, and a towing rope is sleeved on the connecting rod 2 near the bottom. The bottom position of the dummy valve structure for large pipelines is controlled by dragging the towing rope. The combination of the lifting points and the towing rope can achieve precise control of the position of the dummy valve structure during the lifting process, especially the bottom position, which can quickly adjust the alignment state between the dummy valve structure and the pipeline interface, avoid repeated adjustments and the risk of the dummy valve structure colliding with the pipeline, and improve the construction efficiency.

[0073] S4: After all pipelines and valve wells are constructed, disassemble the dummy valve structure for large pipelines and install the corresponding valves.

[0074] In the valve installation method provided in this embodiment, the dummy valve structure for large pipelines is used to occupy the position of the valve to be installed in advance during pipeline construction. The dummy valve structure plays a positioning role during the construction of large pipelines, which can effectively alleviate the problem of error accumulation caused by the long pipeline length or complex on-site conditions, ensure smooth docking during valve installation, and avoid axial or radial misalignment. After all pipelines and valve wells are constructed, the dummy valve structure is disassembled to achieve precise valve installation and reduce installation problems caused by on-site positioning errors.

[0075] In the valve installation method provided by the present invention, the valve installation steps are postponed, and the construction of pipelines and valves is decomposed into two independent stages. The valves are installed uniformly after all pipelines are installed, avoiding low efficiency or operation errors caused by multiple tasks being carried out simultaneously, effectively reducing the rework problems caused by inaccurate valve positioning, reducing waste of construction materials and manpower, and greatly improving the construction efficiency.

[0076] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A false valve structure for a large pipeline, characterized in that: It comprises two mounting plates (1) arranged opposite to each other, wherein the mounting plates (1) are connected via at least one connecting rod (2); The mounting plate (1) is provided with a plurality of bolt holes (3), and the mounting plate (1) is detachably connected between two adjacent installed pipes (100) via the bolt holes (3).

2. A false valve structure for a large pipeline according to claim 1, characterized in that: The bolt hole (3) is configured to have at least three different hole diameters, and the distance between the bolt hole (3) and the center of the mounting plate (1) is configured to have at least three different distances.

3. A false valve structure for a large pipeline according to claim 1, characterized in that: The connecting rod (2) is arranged between each adjacent bolt hole (3).

4. A false valve structure for a large pipeline according to claim 1, characterized in that: The connecting rod (2) is an I-beam.

5. A false valve structure for a large pipeline according to claim 1, characterized in that: The connecting rod (2) is a round steel pipe with a diameter of 200 mm-250 mm.

6. A false valve structure for a large pipeline according to claim 1, characterized in that: The number of the connecting rod (2) is one, and the connecting rod (2) is installed at the center of the mounting plate (1).

7. A false valve structure for a large pipeline according to claim 1, characterized in that: A stiffening rib (4) is provided between the connecting rod (2) and the mounting plate (1), and the stiffening rib (4) is used to improve the connection stability between the connecting rod (2) and the mounting plate (1).

8. A valve installation method, characterized in that: Using the false valve structure for a large pipeline according to any one of claims 1 to 7 comprises the following steps: S1: prefabricate the dummy valve structure for large pipelines with matching size and quantity according to the size and quantity of the valves to be installed; S2: Perform mechanical laying out to determine the installation position and direction of the valve to be installed; S3: constructing valve wells and pipelines, hoisting the dummy valve structure for the large pipeline to the corresponding valve position to be installed to pre-install the dummy valve structure; S4: After the construction of all pipelines and valve wells is completed, the false valve structure used for the large pipeline is dismantled and the corresponding valve is installed.

9. A valve installation method according to claim 8, characterized in that: In S1, the length of the connecting rod (2) is selected according to the size of the valve to be installed, and the length of the connecting rod (2) plus the thickness of the mounting plates (1) at both ends matches the size of the valve to be installed.

10. A valve installation method according to claim 8, characterized in that: In S3, when hoisting the dummy valve structure for a large pipeline, at least two hoisting points are arranged on the top of each mounting plate (1), and a traction rope is set on the connecting rod (2) near the bottom, and the bottom position of the dummy valve structure for a large pipeline is controlled by dragging the traction rope.

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