A large-diameter butterfly valve field pressure test device and method capable of being quickly reconfigured

Abstract

This invention relates to the field of valve pressure testing technology and discloses a rapidly reconfigurable on-site pressure testing device and method for large-diameter butterfly valves. The device includes a blind flange with an interface for injecting media and a testing component that cooperates with the blind flange to cover both ends of the butterfly valve under test. The invention employs multiple independent pressure-applying units arranged discretely and uniformly along the circumference of the butterfly valve under test. Each pressure-applying unit includes a pressure-applying device and an active force-applying element, forming a force-closed path through upper and lower hooks to independently generate axial clamping force. The sum of the clamping forces of multiple pressure-applying units constitutes the total clamping force. The testing component is a rapidly interchangeable pressure plate module or blind flange module, used for internal leakage testing and external leakage testing, respectively. This invention enables the testing of large valves with small modules, decoupling the total weight of the equipment from the valve diameter. It can be pushed and quickly moved by operators, effectively solving the problems of difficult on-site pressure testing of large-diameter butterfly valves and the bulky and immobile equipment.

Description

Technical Field

[0001] This invention relates to the field of valve pressure testing technology, and more specifically, to a field pressure testing device and method for large-diameter butterfly valves that can be quickly reconfigured. Background Technology

[0002] As a core component of fluid transport systems, valves must undergo pressure sealing tests after leaving the factory and after maintenance, making pressure testing equipment an essential testing tool. Currently, the industry mainly uses fixed, large-scale integrated pressure testing benches for large-diameter valves. These benches are dependent on specific sites, have high equipment procurement costs, and are only suitable for large-volume factory testing, making it difficult to meet the pressure testing needs of on-site maintenance and scattered operations.

[0003] Existing technologies often suffer from a long-standing technical bias: testing large-diameter valves, especially those with a nominal diameter of DN1000 or larger, requires a robust, monolithic frame with sufficient strength and rigidity to withstand the enormous axial reaction forces generated during testing (reaching hundreds or even thousands of tons). This "hard-on-hard, large-to-large" design philosophy has dominated the industry for decades, resulting in an exponential increase in frame weight as the diameter of the pressure testing equipment grows (e.g., a DN1200 pressure testing bench weighs over 20 tons). This leads to a dramatic increase in equipment manufacturing costs, transportation costs, and site requirements, ultimately making on-site pressure testing impossible.

[0004] Specifically, when the test diameter reaches DN1000 or larger, existing fixed pressure testing benches generally face the following difficulties: 1. Poor specification adaptability: The frame size of a fixed pressure testing table is fixed, and it can usually only cover a few similar diameter specifications (such as DN1000±200). If you want to cover multiple different diameters such as DN1000, DN1600, DN2500, etc., you need to manufacture multiple pressure testing tables of different specifications, which causes the equipment procurement cost to increase exponentially with the number of diameter types.

[0005] 2. Inability to operate on-site: For valves of DN1000 and above, existing hydraulic cylinder locking pressure testing benches can weigh tens of tons, requiring a dedicated foundation and bridge crane within the factory building. Once these valves are installed on-site or require on-site maintenance, on-site pressure testing is difficult, resulting in a lack of convenient methods.

[0006] 3. Low disassembly and assembly efficiency: If the traditional pressure test blind flange solution is adopted, each diameter and pressure level requires a whole circle of large-specification high-strength special bolts and nuts, numbering in the dozens or even hundreds. Tightening them manually one by one would take several hours, seriously affecting the repair progress.

[0007] Therefore, there is an urgent need in this field for a large-diameter butterfly valve field pressure testing device and method that is easy to disassemble, relocate, and suitable for on-site pressure testing operations. Summary of the Invention

[0008] The axial clamping reaction force does not necessarily have to be borne by a single integral frame. Instead, it can be discretized into multiple independent small pressure-applying units, each bearing only a small portion of the total reaction force. The pressure is then evenly distributed across the valve ends in a circumferential manner. Based on this novel principle, this invention completely abandons the traditional integrated load-bearing frame. This means that the structural dimensions and weight of a single pressure-applying unit are no longer directly correlated with the butterfly valve diameter, and the total equipment weight does not significantly increase with the valve diameter, thus fundamentally solving an industry problem.

[0009] To achieve the above objectives, the present invention provides the following technical solution: A rapidly reconfigurable field pressure testing device for large-diameter butterfly valves includes: Blind flange, used to seal one end of the butterfly valve under test, has an interface for injecting test medium; The test component is used to seal the other end of the butterfly valve under test, and cooperates with the blind flange to cover the two end passages of the butterfly valve under test; N independent pressure application units, N≥3, each pressure application unit includes: an independent pressure application device, the lower end of which is provided with a lower hook for fastening the blind flange, and the upper end of which is provided with an upper hook for fastening the test component; and an active force application element, which is detachably installed between the upper hook and the upper surface of the test component. In this device, all pressure-applying units are arranged discretely and uniformly along the circumference of the butterfly valve under test. Each pressure-applying unit independently generates a clamping force parallel to the axis of the butterfly valve under test. The sum of the clamping forces of the N pressure-applying units constitutes the total clamping force. When the active force-applying element applies pressure, its upper end is limited by the upper hook, and its lower end provides axial pressure to the test component. The lower hook hooks onto the lower surface of the blind flange, thereby causing the upper and lower hooks of each pressure-applying device to clamp the butterfly valve under test through the reaction force. The axial clamping reaction force in the pressure testing device is borne independently by the N independent pressure-applying units. The axial clamping reaction force is mainly borne and transmitted through the closed force path inside each pressure-applying unit.

[0010] Furthermore, the nominal diameter of the butterfly valve under test is ≥DN1000.

[0011] Furthermore, the active force-applying element is one of a split hydraulic jack, an electric cylinder, or a screw jack.

[0012] Furthermore, the test components are quick-interchangeable modules, including: a pressure plate module with a large-diameter central through-hole, the diameter of which is 0% to 15% smaller than the diameter of the butterfly valve passage under test, used to completely expose the outlet of the passage in the butterfly valve under test to the outside, so as to directly observe the leakage and perform internal leakage testing of the butterfly valve sealing surface; or a blind plate module with a small-diameter through-hole for installing a pressure gauge, which is sealed by the pressure gauge during testing, so that the blind plate module and the blind plate flange cooperate to form a closed test chamber for external leakage testing of the butterfly valve body, and the pressure in the test chamber is monitored in real time by the pressure gauge; the pressure plate module and the blind plate module are compatible with the same pressure application unit and blind plate flange, realizing manual and quick reconstruction of the test mode without the use of tools.

[0013] Furthermore, the number N of the pressure-applying units satisfies: 3≤N≤12; the total clamping force is only related to the number of pressure-applying units and the output force of a single active force-applying element, and has no direct proportional relationship with the diameter of the butterfly valve under test.

[0014] Furthermore, the pressure applying device also includes an adjusting structure for adjusting the distance between the upper and lower hooks. The adjusting structure includes a coarse adjustment structure and a locking structure. The coarse adjustment structure includes a sleeve rod, an adjusting rod, and a positioning pin. The sleeve rod is connected to the lower hook, and its wall has several pin holes axially aligned. The adjusting rod is fixedly connected to the upper hook, and its wall has several pin holes axially aligned. The adjusting rod can be inserted vertically into the sleeve rod. The positioning pin passes through the aligned pin holes 1 and 2 sequentially, allowing for rapid adaptation to different structural lengths. The butterfly valve is tested; the locking structure includes an adjusting screw and a positioning nut. The adjusting screw passes through the upper hook, and positioning nuts are respectively provided at the upper and lower ends of the adjusting screw at the upper and lower ends of the upper hook, which are used to lock the axial position of the upper hook relative to the adjusting screw after coarse adjustment. When the active force-applying element applies force, the adjusting screw bears axial compressive force, preventing the upper hook from displacing upward, thereby limiting or reducing axial deformation. The active force-applying element itself has a telescopic stroke, and after the locking structure is fixed, it provides an adjustable axial clamping force / predetermined axial clamping force to the test component through telescopic extension.

[0015] Furthermore, at least three of the pressure-applying devices are evenly spaced circumferentially around the axis of the butterfly valve under test, and at least three casters are provided at the bottom of the pressure-applying devices.

[0016] Furthermore, the interface on the blind flange is used for detachably connecting a test medium pipeline, which is connected to the output of a portable electric test pump or air compressor.

[0017] Furthermore, the device has a base to which the blind flange is detachably fixed.

[0018] Furthermore, a pressure gauge is integrated on the blind flange, and the pressure gauge is connected to the test chamber; the pressure gauge installed on the blind flange module and the pressure gauge on the blind flange serve as backups for each other or are used for pressure monitoring at different locations.

[0019] This invention also provides a method for on-site pressure testing of large-diameter butterfly valves, which is implemented using the above-mentioned device and includes the following steps: S1: Place the butterfly valve to be tested on the blind flange, and install a pressure plate module or a blind flange module on the other side of the butterfly valve to be tested, depending on the test purpose. S2: Arrange N pressure-applying devices evenly along the circumference of the butterfly valve to be tested, so that the lower hook in each pressure-applying device hooks onto the lower surface of the blind flange, and adjust the height of each pressure-applying device so that its upper hook is positioned above the test component and between the upper surface of the test component to form an installation gap that can accommodate the active force-applying element. S3: An active force-applying element is installed between the upper hook of each pressure-applying device and the upper surface of the installed pressure plate module or blind plate module. All active force-applying elements are operated to apply pressure to the predetermined clamping force in sequence or synchronously, and the butterfly valve to be tested is clamped through the force-closed path inside each pressure-applying unit. S4: Inject the test medium and pressurize it through the test medium injection port on the blind flange; S5: Observe the leakage situation, depressurize after the test is completed, disassemble all components, and use the casters at the bottom of the pressure device to move it to another location.

[0020] Compared with the prior art, the present invention has the following beneficial effects: 1. In this invention, the pressure application device, blind flange and test components all adopt a detachable split structure, abandoning the traditional high-integration overall design of equipment. This allows the equipment to break through the technical prejudice that large-diameter valve testing requires large equipment. It creatively discretizes the clamping system, so that the pressure testing machine is freed from the constraint that the larger the diameter, the heavier the frame.

[0021] 2. In this invention, the bottom of the pressure application device is equipped with casters, which allow a single person to move the pressure application device. Combined with the modular equipment components, this makes the device easier to disassemble, move, and transport. It does not require a fixed work site and can flexibly follow the maintenance team to meet the needs of on-site maintenance and sporadic pressure testing, effectively improving the efficiency of valve maintenance and testing.

[0022] 3. In this invention, the test architecture can be quickly reconfigured by rapidly interchangeing the pressure plate and the blind plate, so that the internal leakage and external leakage test modes can be switched on the same set of devices. At the same time, the use of multiple sets of surrounding pressure devices in conjunction with the clamping and sealing structure of the sealing plates at both ends can stably seal and pressurize both ends of the butterfly valve under test, ensuring the sealing performance and detection accuracy of the valve pressure test.

[0023] 4. In this invention, by replacing blind flanges and test components of different sizes, it can be adapted to pressure testing of large-diameter butterfly valves of different specifications and sizes, making the equipment more widely applicable. This significantly reduces the cost of equipment manufacturing and use, effectively lowers the threshold for equipment use, and makes it affordable for small construction units and maintenance teams, thus significantly improving the economic efficiency of equipment use. Attached Figure Description

[0024] Figure 1 This is a three-dimensional structural schematic diagram of the pressure testing device used for external leakage testing in this invention; Figure 2 This is a three-dimensional structural schematic diagram of the pressure testing device used for internal leakage testing in this invention; Figure 3 This is a three-dimensional structural diagram of the blind flange in this invention; Figure 4 This is a three-dimensional structural diagram of the pressure application device in this invention; Figure 5 This is a three-dimensional structural diagram of the pressure plate module in this invention; Figure 6 This is a three-dimensional structural diagram of the blind plate module in this invention.

[0025] In the diagram: 1. Test component; 10. Butterfly valve under test; 2. Blind flange; 3. Pressure application device; 30. Upper hook; 31. Lower hook; 32. Caster wheel; 300. Sleeve rod; 301. Adjusting rod; 302. Positioning pin; 303. Adjusting screw; 304. Positioning nut; 4. Separable hydraulic jack; 5. Pressure plate module; 6. Blind flange module. Detailed Implementation

[0026] It is important to note that the core concept of this invention lies in the "fully discretized force-sealing pressure unit." In each pressure unit, the thrust generated by the active force-applying element acts simultaneously on the upper hook and the test component: pushing the upper hook upward and pressing the test component downward. The lower hook hooks onto the lower surface of the blind flange, and the blind flange transmits the upward reaction force to the test component through the butterfly valve under test. This reaction force balances the downward thrust of the active force-applying element at the test component. Simultaneously, the upward thrust on the upper hook is transmitted to the lower hook through the sleeve rod, positioning pin, adjusting rod, adjusting screw, and positioning nut of the pressure device, forming a complete force-sealing path. In the entire pressure unit, all action and reaction forces cancel each other out within the unit, without relying on any external frame to bear the axial clamping reaction force. Multiple pressure units are arranged around the butterfly valve under test, and their number can be flexibly increased or decreased according to the valve diameter and the required total clamping force, generally from 3 to 12. A single pressure unit, equipped with casters at the bottom, can be moved by the operator on flat ground. This is fundamentally different from the traditional integrated pressure testing bench, achieving a technological breakthrough of "testing large valves with small modules".

[0027] Additional mechanical explanation regarding the pressure application units: The clamping force generated by each pressure application unit has a line of action parallel to the axis of the butterfly valve under test. Because multiple pressure application units are uniformly and symmetrically arranged circumferentially, the eccentric bending moments generated by each unit cancel each other out in the circumferential direction, ultimately forming a uniform axial pressure distribution on the two end faces of the butterfly valve under test, with the resultant force acting through the axis.

[0028] Comparative Example: Taking a butterfly valve with a nominal diameter of DN2000 as an example, if a traditional integrated hydraulic cylinder locking pressure test bench is used, the equipment's weight typically exceeds 20 tons, requiring a dedicated foundation and a bridge crane with matching lifting capacity, making it impossible to move to the site. However, the device of this invention requires only 8 pressure application units. All pressure application units, blind flanges, and test components can be disassembled and transported separately, eliminating the need for large lifting equipment. Two operators can assemble and begin testing on-site, and the device can be quickly disassembled and moved after testing. Therefore, the total weight of the device of this invention is essentially decoupled from the valve diameter, eliminating the need for heavy lifting equipment and achieving portability and on-site adaptability unattainable by traditional equipment.

[0029] In this invention, "large diameter" specifically refers to butterfly valves with a nominal diameter ≥ DN1000. At this diameter, the weight and cost of traditional integrated pressure testing benches increase dramatically with increasing diameter, making the technical advantages of this invention particularly significant. The device provided in this application is mainly applied to on-site pressure testing scenarios for large-diameter butterfly valves in fields such as water conservancy, municipal engineering, and petrochemicals.

[0030] like Figures 1-6 As shown, the device includes a blind flange 2, a test component 1, and multiple pressure-applying devices 3. The blind flange 2 has an interface for injecting the test medium. The test component 1 cooperates with the blind flange 2 to cover the two end passages of the butterfly valve 10 under test.

[0031] At least three pressure-applying devices 3 are evenly distributed circumferentially along the butterfly valve 10 under test. The lower end of each pressure-applying device 3 is provided with a lower hook 31 for fastening the blind flange 2, and the upper end is provided with an upper hook 30 for fastening the test component 1. A detachable hydraulic jack 4 is detachably mounted on the upper hook 30, located between the upper hook 30 and the upper surface of the test component 1. When the detachable hydraulic jack 4 applies pressure, its upper end is limited by the upper hook 30, and its lower end provides axial pressure to the test component 1 to push the test component 1 downwards.

[0032] The following description focuses on the test component 1 mentioned above. This test component 1 can optionally be a pressure plate module 5 or a blind plate module 6. For example... Figure 2 and Figure 5As shown, the pressure plate module 5 has a large-diameter central through hole, which is used to completely expose the outlet of the passage in the butterfly valve 10 under test to the outside, so as to directly observe the leakage during internal leakage testing. Figure 1 and Figure 6 As shown, the blind flange module 6 has a small-diameter through hole with internal threads on its inner wall. This through hole is used to install a pressure gauge. During the external leakage test of the housing, the pressure gauge is screwed into the small through hole and sealed, so that the blind flange module 6 mates with the blind flange 2, forming a closed test chamber together with the inner cavity of the butterfly valve 10 under test.

[0033] The pressure application device 3 mentioned above also includes an adjustment structure for adjusting the distance between the upper hook 30 and the lower hook 31. This adjustment structure includes a coarse adjustment structure and a locking structure. The coarse adjustment structure includes a sleeve rod 300, an adjusting rod 301, and a positioning pin 302. The locking structure includes an adjusting screw 303 and a positioning nut 304. The coarse adjustment structure allows for quick adaptation to butterfly valves of different structural lengths, while the locking structure provides rigid support, preventing tensile deformation or displacement of the pressure application device under stress and ensuring stable transmission of clamping force.

[0034] In one embodiment, the device has a base to which the blind flange 2 is detachably fixed. The base provides stable initial support for the blind flange 2 and the butterfly valve 10 placed thereon, facilitating the subsequent alignment and installation of the pressure application device 3.

[0035] The blind flange 2 has an annular sealing groove on its end face that contacts the butterfly valve 10 under test, and a sealing ring is installed in the sealing groove. The sealing ring can be made of elastic materials such as rubber or polytetrafluoroethylene to achieve a reliable static seal.

[0036] This application also provides a method for on-site pressure testing of large-diameter butterfly valves, implemented using the apparatus described in any of the above embodiments. Figure 1 and Figure 2 As shown, the method includes the following steps: S1: Place the butterfly valve 10 to be tested on the blind flange 2. Depending on the test purpose, install the pressure plate module 5 or the blind flange module 6 on the other side of the butterfly valve 10 to be tested. S2: Arrange N pressure devices 3 evenly along the circumference of the butterfly valve to be tested, so that the lower hook 31 of each pressure device 3 hooks onto the lower surface of the blind flange 2, and adjust the height of each pressure device 3 so that its upper hook 30 is located above the test component 1 and between the test component and the upper surface of the test component to form an installation gap that can accommodate the active force application element. Multiple pressure-applying devices 3 are evenly arranged around the butterfly valve 10 to be tested. The height of the coarse adjustment structure in each pressure-applying device 3 is adjusted, and the lower hook 31 of each pressure-applying device 3 is made to fasten to the lower surface of the blind flange 2. Then, the upper hook 30 is made to just contact the upper surface of the test component 1 by adjusting the screw 303, and locked with the positioning nut 304. S3: An active force-applying element is installed between the upper hook 30 of each pressure-applying device 3 and the upper surface of the installed pressure plate module 5 or blind plate module 6. All active force-applying elements are operated to apply pressure to the predetermined clamping force in sequence or synchronously, and the butterfly valve 10 to be tested is clamped through the force-closed path inside each pressure-applying unit. Between the upper hook 30 of each pressure device 3 and the upper surface of the installed pressure plate module 5 or blind plate module 6, a separate hydraulic jack 4 is installed. All jacks are operated to apply pressure synchronously, and the jacks themselves provide precise axial clamping force by extending and retracting, until the test component 1 and the blind plate flange 2 press and seal the butterfly valve 10 to be tested. S4: Inject test pressure medium through the test pressure medium injection port on the blind flange 2 and pressurize it; connect the test pressure medium pipeline through the test pressure medium injection port on the blind flange 2, inject test pressure medium into the space enclosed by the blind flange 2, test component 1 and the butterfly valve 10 to be tested and pressurize it to the specified value, which is generally 1.5 times the nominal pressure; When the test component is the blind plate module 6, and an external leakage test is performed, the blind plate module 6, the blind plate flange 2, and the butterfly valve 10 under test form a closed test chamber. The test medium is injected into the test chamber through the medium injection interface and the pressure is maintained. The pressure is observed in real time through the pressure gauge installed on the blind plate module 6 and / or the pressure gauge on the blind plate flange 2 to check whether there is leakage in the butterfly valve body, flange connection, etc. When the test component is pressure plate module 5, during the internal leakage test, the large through hole of pressure plate module 5 connects the passage outlet of the butterfly valve under test with the outside. After injecting the test pressure medium through the test pressure medium injection interface, observe whether the medium flows out at the large through hole of the pressure plate. If it continues to flow out, it indicates that there is internal leakage on the sealing surface of the butterfly valve.

[0037] S5: Observe the leakage situation. After completing the test, depressurize and disassemble all components. Use the casters 32 at the bottom of the pressure device 3 to move the device to the next work site. Maintain pressure and observe the leakage situation. After completing the test, depressurize the test chamber, then remove the pressure of the split hydraulic jack 4, disassemble all components, and use the casters 32 at the bottom of the pressure device 3 to move the device to the next work site.

[0038] Those skilled in the art should understand that the above embodiments are merely illustrative and are not intended to limit the scope of the invention. Any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the invention should be included within the protection scope of the invention.

Claims

1. A field pressure testing device for large-diameter butterfly valves with rapid reconfiguration, characterized in that, include: Blind flange (2) is used to seal one end of the butterfly valve (10) to be tested, and it is provided with an interface for injecting test pressure medium; Test component (1) is used to seal the other end of the butterfly valve (10) under test, and cooperates with the blind flange (2) to cover the two ends passage of the butterfly valve under test; There are N independent pressure application units, where N ≥ 3, and each pressure application unit includes: An independent pressure device (3) has a lower hook (31) at its lower end for fastening the blind flange (2) and an upper hook (30) at its upper end for fastening the test component (1). An active force-applying element is detachably mounted between the upper hook (30) and the upper surface of the test component (1); Among them, all pressure units are arranged discretely and uniformly along the circumference of the butterfly valve (10) under test. Each pressure unit independently generates a clamping force parallel to the axis of the butterfly valve under test. The sum of the clamping forces of N pressure units constitutes the total clamping force. When the active force-applying element is pressurized, its upper end is limited by the upper hook (30), and its lower end provides axial pressure to the test component (1). The lower hook (31) hooks onto the lower surface of the blind flange (2), thereby using reaction force to make the upper hook (30) and lower hook (31) of each pressure-applying device (3) cooperate to clamp the butterfly valve (10) to be tested. The axial clamping reaction force in the pressure testing device is borne independently by each of the N independent pressure applying units. The axial clamping reaction force is mainly borne and transmitted through the closed force path inside each pressure applying unit.

2. The field pressure testing device for a large-diameter butterfly valve with rapid reconfiguration according to claim 1, characterized in that: The nominal diameter of the butterfly valve (10) to be tested is ≥DN1000.

3. The field pressure testing device for a large-diameter butterfly valve with rapid reconfiguration according to claim 1, characterized in that: The active force-applying element is one of a split hydraulic jack (4), an electric cylinder, or a screw jack.

4. The field pressure testing device for a large-diameter butterfly valve with rapid reconfiguration according to claim 1, characterized in that: The test component (1) is a quickly interchangeable module, including: The pressure plate module (5) has a large-diameter central through hole, the diameter of which is 0% to 15% smaller than the diameter of the passage of the butterfly valve under test. This is used to completely expose the outlet of the passage in the butterfly valve under test (10) to the outside, so as to directly observe the leakage and perform an internal leakage test on the butterfly valve sealing surface; or, The blind plate module (6) has a small-diameter through hole for installing a pressure gauge. The through hole is sealed by the pressure gauge during testing, so that the blind plate module (6) and the blind plate flange (2) cooperate to form a closed test chamber for testing the external leakage of the butterfly valve body, and the pressure inside the test chamber is monitored in real time by the pressure gauge. The pressure plate module (5) and the blind flange module (6) are compatible with the same pressure unit and blind flange (2), enabling manual and rapid reconfiguration of the test mode without the need for tools.

5. The field pressure testing device for a large-diameter butterfly valve with rapid reconfiguration according to claim 1, characterized in that: The number N of the pressure-applying units satisfies: 3≤N≤12.

6. The field pressure testing device for a large-diameter butterfly valve with rapid reconfiguration according to claim 1, characterized in that: The pressure application device (3) further includes an adjustment structure for adjusting the distance between the upper hook (30) and the lower hook (31), the adjustment structure comprising: Coarse adjustment structure: includes a sleeve rod (300), an adjusting rod (301) and a positioning pin (302). The sleeve rod (300) is connected to the lower hook (31). The cylinder wall is provided with several pin holes one along the axial direction. The adjusting rod (301) is fixedly connected to the upper hook (30). The rod wall is provided with several pin holes two along the axial direction. The adjusting rod (301) can be inserted into the sleeve rod (300) in a way that allows it to move up and down. The positioning pin (302) passes through the aligned pin holes one and pin holes two in sequence, which is used to quickly adapt to the butterfly valve under test with different structural lengths. Locking structure: includes adjusting screw (303) and positioning nut (304). The adjusting screw (303) passes through the upper hook (30), and positioning nuts (304) are respectively provided at the upper and lower ends of the adjusting screw (30) to lock the axial position of the upper hook (30) relative to the adjusting rod (301) after coarse adjustment. When the active force-applying element applies force, the adjusting screw (303) bears axial compressive force, preventing the upper hook from moving upward, thereby limiting or reducing axial deformation. The active force-applying element itself has a telescopic stroke, and after the locking structure is fixed, it provides an adjustable axial clamping force / predetermined axial clamping force to the test component (1) through telescopic extension.

7. The field pressure testing device for a large-diameter butterfly valve with rapid reconfiguration according to claim 1, characterized in that: At least three pressure-applying devices (3) are evenly spaced around the axis of the butterfly valve to be tested, and each pressure-applying device (3) has at least three casters (32) at its bottom.

8. The field pressure testing device for a large-diameter butterfly valve with rapid reconfiguration according to claim 1, characterized in that: The interface on the blind flange (2) is used for detachable connection of the test medium pipeline, which is connected to the output of a portable electric test pump or air compressor.

9. The field pressure testing device for a large-diameter butterfly valve with rapid reconfiguration according to claim 1, characterized in that: It has a base to which the blind flange (2) is detachably fixed.

10. The field pressure testing device for a large-diameter butterfly valve with rapid reconfiguration according to claim 4, characterized in that: A pressure gauge is integrated on the blind flange (2), and the pressure gauge is connected to the test chamber; the pressure gauge installed on the blind plate module (6) and the pressure gauge on the blind flange (2) are either backups for each other or used for pressure monitoring at different locations.

11. A method for on-site pressure testing of a large-diameter butterfly valve, implemented using the rapidly reconfigurable on-site pressure testing device for a large-diameter butterfly valve as described in any one of claims 1-10, characterized in that... Includes the following steps: S1: Place the butterfly valve (10) to be tested on the blind flange (2). Depending on the test purpose, install the pressure plate module (5) or the blind flange module (6) on the other side of the butterfly valve (10). S2: Arrange N pressure devices (3) evenly along the circumference of the butterfly valve to be tested, so that the lower hook (31) in each pressure device (3) hooks onto the lower surface of the blind flange (2), and adjust the height of each pressure device (3) so that the upper hook (30) is located above the test component (1) and between the test component and the upper surface of the test component to form an installation gap that can accommodate the active force application element. S3: Install an active force-applying element between the upper hook (30) of each pressure-applying device (3) and the upper surface of the installed pressure plate module (5) or blind plate module (6). Operate all active force-applying elements to apply pressure sequentially or synchronously to the predetermined clamping force, and clamp the butterfly valve (10) to be tested through the force-closed path inside each pressure-applying unit. S4: Inject the test medium and pressurize it through the test medium injection port on the blind flange (2); S5: Observe the leakage situation, after completing the test, depressurize and disassemble each component, and use the universal wheels (32) at the bottom of the pressure device (3) to push it to the transfer site.

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