Cage type double seal structure regulating valve sealing verification device

Abstract

The present application belongs to the technical field of valve maintenance, more particularly to a cage type double seal structure regulating valve sealing verification device. The device comprises a box body, a first sealing element and a second sealing element arranged in the cavity of the box body. When the valve core assembly is installed in the cavity, the first sealing element, the second sealing element, the cavity wall and the side wall of the valve cage form a pressing gap. The pressing gap is communicated with the throttle hole of the valve cage. The box body is provided with an inflow hole for the input of the pressing medium into the pressing gap. The box body is also provided with an outflow hole communicated with the fluid outlet of the valve core assembly, which is used to discharge the leaked pressing medium of the valve core assembly. In this way, the sealing property of the valve core assembly can be verified by observing the amount of the pressing medium flowing out of the outflow hole. By setting the box body to simulate the valve body, the sealing property of the valve core assembly of the double seal structure regulating valve can be tested without disassembling the valve body from the equipment, thus reducing the difficulty of sealing verification and simplifying the operation process.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of valve maintenance, and more particularly to a cage type double-sealing structure regulating valve sealing verification device. BACKGROUND

[0002] As a key component of a power plant, a valve is equipped in a large number of units, and a large number of valves need to be disassembled and maintained in each overhaul. Among them, the valve body and the pipeline are usually connected by welding, and the valve body needs to be separated from the pipeline during maintenance, such as cutting the valve body from the pipeline for pressure sealing verification, which not only greatly increases the on-site maintenance workload, but also seriously damages the on-site equipment by frequently cutting the welds at the welding connection positions, reduces the reliability of the welding connection, and affects the normal regulation of the valve. SUMMARY

[0003] The purpose of the embodiment of the application is to provide a cage type double-sealing structure regulating valve sealing verification device, which aims to solve the problems of great difficulty, complicated operation and low efficiency in sealing verification of the double-sealing structure regulating valve in the prior art.

[0004] To achieve the above-mentioned purpose, the technical solution adopted by the application is:

[0005] Provided is a cage type double-sealing structure regulating valve sealing verification device, comprising:

[0006] a box body provided with a containing cavity, the containing cavity being used for mounting a valve core assembly to be detected, the box body being provided with a first through hole penetrating through the containing cavity, the first through hole being used for the valve stem of the valve core assembly to extend out;

[0007] a first sealing member arranged in the containing cavity and used for sealingly connecting one end of the valve cage along a first direction between the box body and the valve core assembly when the valve core assembly is mounted in the containing cavity;

[0008] a second sealing member arranged in the containing cavity and used for sealingly connecting the other end along the first direction opposite to the one end of the valve cage between the box body and the valve core assembly when the valve core assembly is mounted in the containing cavity;

[0009] When the valve core assembly is mounted in the containing cavity, the first sealing member, the second sealing member, the cavity wall of the containing cavity and the side wall of the valve cage form a pressurizing gap, the pressurizing gap is used for being communicated with the throttling hole of the valve cage, the box body is further provided with an inlet flow hole communicated with the pressurizing gap, the inlet flow hole is used for inputting a pressurizing medium into the pressurizing gap, and the box body is further provided with an outlet flow hole communicated with the fluid outlet of the valve core assembly, the outlet flow hole is used for discharging the leaked pressurizing medium of the valve core assembly.

[0010] In some embodiments, the box comprises a first pressing plate, a second pressing plate and a frame, the first pressing plate and the second pressing plate are parallelly spaced apart along a first direction, one end of the frame along the first direction is sealingly connected with the first pressing plate, the other end of the frame along the first direction is sealingly connected with the second pressing plate, the first pressing plate, the frame and the second pressing plate form a cavity, an inflow hole is arranged on the frame, a first sealing member is arranged on the first pressing plate, and a second sealing member is arranged on the second pressing plate.

[0011] In some embodiments, a connecting assembly is arranged between the first pressing plate and the second pressing plate, and the connecting assembly is used to connect the first pressing plate and the second pressing plate along the first direction.

[0012] In some embodiments, the connecting assembly comprises a screw rod and a nut, one end of the screw rod is fixedly connected with one of the first pressing plate and the second pressing plate, the other end of the screw rod is a threaded segment and penetrates the other one of the first pressing plate and the second pressing plate, and the nut is screwed on the threaded segment and can rotate along the first direction to press the adjacent first pressing plate or second pressing plate.

[0013] In some embodiments, the first pressing plate is provided with a first through hole, the first sealing member comprises a first sealing part and a second sealing part, the first sealing part is arranged between the frame and the first pressing plate to sealingly connect the frame and the first pressing plate, and the second sealing part is arranged in the cavity and surrounds the first through hole, and the second sealing part is used to abut and seal against the top surface of the valve cage.

[0014] In some embodiments, the second pressing plate is provided with an outflow hole, the second sealing member comprises a third sealing part and a fourth sealing part, the third sealing part is arranged between the frame and the second pressing plate to sealingly connect the frame and the second pressing plate, the fourth sealing part is arranged in the cavity and surrounds the outflow hole, and the fourth sealing part is used to abut and seal against the valve seat sealingly connected with the bottom surface of the valve cage.

[0015] In some embodiments, one side of the first pressing plate facing the second pressing plate is provided with a first groove recessed along the first direction, the first through hole is arranged at the bottom of the first groove, and the first sealing member is embedded in the first groove.

[0016] In some embodiments, one side of the second pressing plate facing the first pressing plate is provided with a second groove recessed along the first direction, the outflow hole is arranged at the bottom of the second groove, and the second sealing member is embedded in the second groove.

[0017] In some embodiments, the first sealing member is provided with a second through hole, the second through hole is located below the first through hole along the first direction, the center line of the first through hole coincides with the center line of the second through hole, and the projection of the second through hole along the first direction covers the first through hole.

[0018] In some embodiments, the second pressing plate is further connected with a flow collecting member, the inlet of the flow collecting member covers the outflow hole, and the outlet of the flow collecting member is used to be connected with a metering device for metering the volume or weight of the medium to be pressed.

[0019] In some embodiments, at least one of the first seal and the second seal is an elastic seal.

[0020] In some embodiments, the first pressing plate or the second pressing plate is further provided with an exhaust hole for communicating with the pressing gap, and an exhaust valve is installed in the exhaust hole.

[0021] In some embodiments, the cage double-seal structure regulating valve leakproofness verification device further comprises a pressing tool, which is arranged outside the accommodating cavity and used to provide a pressing force to the valve stem of the valve core assembly installed in the accommodating cavity.

[0022] The cage double-seal structure regulating valve leakproofness verification device provided by the present application has the following beneficial effects: in use, the valve core assembly of the regulating valve to be subjected to leakproofness verification is installed into the accommodating cavity of the box body, and the two ends of the valve cage of the valve core assembly in the first direction are sealed with the box body through the first seal and the second seal respectively, and a pressing gap is formed between the valve cage and the cavity wall of the accommodating cavity of the box body, the box body is provided with an inlet hole communicating with the pressing gap, the pressing gap communicates with the throttling hole of the valve cage, and meanwhile, the outlet hole of the box body communicates with the fluid outlet of the valve core assembly, so that the pressing medium is injected into the pressing gap through the inlet hole, and the pressure environment in which the valve core assembly is located in actual work can be simulated by adjusting the input amount of the pressing medium, on this basis, when the valve core assembly leaks, the pressing medium will continue to flow to the leakage position under the action of pressure after entering the valve cage through the throttling hole, and finally flows out to the outside of the box body through the outlet hole of the box body. Therefore, when the valve core assembly is installed in the accommodating cavity, and when at least one of the first sealing part and the second sealing part of the valve core assembly leaks, whether the valve core assembly leaks can be determined by observing whether the pressing medium flows out of the outlet hole, and at the same time, the leakage rate of the valve core assembly can be obtained by measuring the amount of the pressing medium flowing out of the outlet hole, so as to evaluate whether the leakage of the valve core assembly subjected to verification is within an allowable range. In this way, without disassembling the valve body of the regulating valve from the equipment, the valve body can be simulated by the box body, so that the leakproofness verification of the valve core assembly can be realized, the difficulty of leakproofness verification of the double-seal structure regulating valve is reduced, the operation process is simplified, and the efficiency and accuracy of leakproofness verification are improved. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative labor.

[0024] Figure 1 is a sectional view of the cage double-seal structure regulating valve;

[0025] Figure 2 For Figure 1 Enlarged view of part A in the figure;

[0026] Figure 3 For Figure 1 Structural schematic view of the cage of the cage double-seal structure regulating valve shown in the figure;

[0027] Figure 4 For Figure 1 Structural schematic view of the assembly structure of the valve core and valve stem of the cage double-seal structure regulating valve shown in the figure;

[0028] Figure 5 The cage double-seal structure regulating valve sealing verification device provided by the embodiment of the application;

[0029] Figure 6 For Figure 5 Cross-sectional view of the cage double-seal structure regulating valve sealing verification device shown in the figure;

[0030] Figure 7 For Figure 6 Another view of the structure shown in the figure;

[0031] Figure 8 For Figure 5 Structural schematic view of the first pressing plate of the box of the cage double-seal structure regulating valve sealing verification device shown in the figure;

[0032] Figure 9 For Figure 5 Structural schematic view of the second pressing plate of the box of the cage double-seal structure regulating valve sealing verification device shown in the figure;

[0033] Figure 10 For Figure 1 The cage double-seal structure regulating valve uses Figure 5 Structural schematic view of the assembly structure when the cage double-seal structure regulating valve sealing verification device shown in the figure is used for sealing verification;

[0034] Figure 11 For Figure 10 Cross-sectional view of the structure shown in the figure.

[0035] In the figure, each reference sign:

[0036] 10, cage double-seal structure regulating valve; 11, valve body; 12, valve core assembly; 121, valve core; 1211, valve core through hole; 122, valve seat; 1221, fluid outlet; 123, valve cage; 1231, throttling hole; 124, valve stem; 125, first sealing position; 1251, first sealing surface; 1252, second sealing surface; 127, compression ring; 126, second sealing position; 1261, third sealing surface; 1262, fourth sealing surface;

[0037] 20, box; 201, first pressing plate; 2011, first edge portion; 2012, first groove; 202, second pressing plate; 2021, second edge portion; 2022, second groove; 2023, third groove; 203, frame; 21, cavity; 22, first through hole; 23, inflow hole; 24, outflow hole; 25, exhaust hole; 251, exhaust valve;

[0038] 30, first sealing member; 31, first sealing portion; 32, second sealing portion; 33, second through hole; 34, avoiding hole;

[0039] 40, second sealing member; 41, third sealing portion; 42, fourth sealing portion;

[0040] 50, pressing gap;

[0041] 60, connecting assembly; 61, screw rod; 611, threaded segment; 62, nut;

[0042] 70, flow collecting member. DETAILED DESCRIPTION

[0043] In order to make the technical problems to be solved by the present application, the technical solutions and beneficial effects clearer, the following will combine with the accompanying drawings to further describe the present application in detail. It should be understood that the specific embodiments described here are only used to explain the present application, and are not used to limit the present application. Figures 1 to 11 The present application will be described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present application, and are not used to limit the present application.

[0044] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0045] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0046] In addition, the terms "first", "second", "third", etc. are used only for descriptive purposes and are not to be construed as indicating or implying relative importance or an ordered ranking of the indicated technical features. Thus, features defined with "first", "second" or "third" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, the meaning of "a plurality of groups" is two groups or more, the meaning of "a plurality of pieces" is two pieces or more, and the meaning of "several" is one or more, unless otherwise explicitly and specifically limited.

[0047] Valves are key components of power plants, and each unit is equipped with a large number of valves. A large number of valves need to be disassembled and repaired during each overhaul. Among them, the valve body and the pipeline are usually connected by welding. When repairing, the valve body needs to be separated from the pipeline, such as cutting the valve body from the pipeline for pressure sealing verification, which not only greatly increases the on-site repair workload, but also seriously damages the on-site equipment by frequently cutting the welds at the welding connection positions, reduces the reliability of the welding connection, and affects the normal regulation of the valve.

[0048] In the related art, the seal verification method commonly used for the cage type double seal structure regulating valve is the blue oil test, that is, blue oil is applied on the sealing surface of the valve disc or the valve seat, and the contact cooperation of the valve disc and the valve seat sealing surface is observed to determine the valve sealing performance. When using this method to detect the sealing performance of the double seal structure regulating valve, due to the special structure of the regulating valve, the blue oil test cannot effectively verify the sealing effect. For example, the valve frequently leaks during daily operation, and multiple maintenance checks do not find any abnormalities in the sealing surface. The blue oil test is performed on the upper and lower sealing surfaces, and the results show that the sealing surface cooperates well, but the internal leakage problem still occurs after reassembly, which fully reflects the limitations and roughness of the blue oil test.

[0049] Based on this, the embodiment of the present application provides a cage type double seal structure regulating valve seal verification device to solve the above problems.

[0050] Please refer to Figures 1 to 11 , the cage type double seal structure regulating valve seal verification device provided by the embodiment of the present application is suitable for but not limited to verifying the sealing performance of the cage type double seal structure regulating valve when maintaining the equipment of the nuclear power plant. In the embodiment of the present application, the first direction is the direction indicated by the arrow F in the figure, and the axial direction of the valve stem and the moving direction of the valve core are parallel to the first direction.

[0051] As Figures 1 to 4 indicated, Figure 1 a cross-sectional view of a typical cage type double seal structure regulating valve is shown, Figure 2 is Figure 1 an enlarged view of part A in the figure, that is, a structure schematic diagram of the valve core assembly part, Figure 3 is Figure 1The structure diagram of the cage of the cage double-seal structure regulating valve, Figure 4 For Figure 1 The structure diagram of the assembly of the valve core and the valve stem of the cage double-seal structure regulating valve.

[0052] Specifically, as Figure 1 And Figure 2 The cage double-seal structure regulating valve 10 mainly consists of a valve body 11 and a valve core assembly 12 arranged on the valve body 11, wherein the valve core assembly 12 comprises a valve core 121, a valve stem 124, a valve seat 122, a valve cage 123 and a compression ring 127, the valve core 121 is located in the valve cage 123, the valve stem 124 is connected to the top end of the valve core 121, and the end of the valve stem 124 away from the valve core 121 extends out of the valve cage 123, so that the valve core 121 can move back and forth along the axial direction of the valve stem 124 when the valve stem 124 is subjected to axial pressure or tension, the valve seat 122 is arranged at one end of the valve core 121, and the bottom end of the valve core 121 facing the valve seat 122 has a first sealing position 125, the top end of the valve core 121 and the end of the valve cage 123 are compressed and sealed by the compression ring 127 cooperating with the sealing ring, and the top end of the valve core 121 and the compression ring 127 have a second sealing position 126, the first sealing position 125 seals the bottom end of the valve core assembly 12, and the second sealing position 126 seals the top end of the valve core assembly 12, thereby forming a two-way seal of the regulating valve.

[0053] As Figures 2 to 4 The valve seat 122 is provided with a fluid outlet 1221, the side wall of the valve cage 123 is provided with a plurality of throttling holes 1231, the valve core 121 can move up and down in the valve cage 123 along the height direction of the valve cage 123, i.e. the first direction, when the valve core 121 moves downward to compress the valve seat 122, all the throttling holes 1231 on the valve cage 123 are blocked by the valve core 121, at this time, the regulating valve is in a closed state, and when the valve core 121 moves upward to partially or completely unblock the throttling holes 1231, the regulating valve is in an open state, the throttling holes 1231 are in communication with the fluid outlet 1221, and the medium can flow into the valve cage 123 through the throttling holes 1231 and flow out through the fluid outlet 1221 of the valve seat 122.

[0054] Among them, as Figures 2 to 4As shown, the bottom end of the valve core 121 facing the valve seat 122 has a first sealing position 125, which includes a first sealing surface 1251 provided on the valve core 121 and abutting against the valve seat 122, and a second sealing surface 1252 provided on the valve seat 122 and abutting against the first sealing surface 1251, and the regulating valve is closed. If leakage occurs at the first sealing position 125, the medium will flow into the valve cage 123 through the throttling hole 1231 and flow out through the leakage position between the first sealing surface 1251 and the second sealing surface 1252. The top end of the valve core 121 and the compression ring 127 have a second sealing position 126, which includes a third sealing surface 1261 provided on the valve core 121 and abutting against the compression ring 127, and a fourth sealing surface 1262 provided on the compression ring 127 and abutting against the third sealing surface 1261. The valve core 121 is also provided with a valve core through hole 1211 penetrating the fluid outlet 1221 in the axial direction. When leakage occurs at the second sealing position 126, the medium will flow into the valve cage 123 through the throttling hole 1231, flow upward through the leakage position between the third sealing surface 1261 and the fourth sealing surface 1262 of the second sealing position 126, and then flow downward through the valve core through hole 1211 to flow out through the fluid outlet 1221. Thus, for such a cage double-sealing structure regulating valve 10, the sealing performance of the two sealing positions at the top end and the bottom end of the valve core 121 needs to be detected simultaneously during the sealing performance verification test.

[0055] In the embodiments of the present application, as shown in Figures 5 to 9 The cage double-sealing structure regulating valve sealing performance verification device includes a box body 20, a first sealing member 30 and a second sealing member 40. The box body 20 is provided with a containing cavity 21 for installing the valve core assembly 12 to be detected. The box body 20 is provided with a first through hole 22 penetrating the containing cavity 21, which is used for the valve stem 124 of the valve core assembly 12 to extend out. The first sealing member 30 is arranged in the containing cavity 21 and is used for sealingly connecting the box body 20 and one end of the valve cage 123 of the valve core assembly 12 along a first direction when the valve core assembly 12 is installed in the containing cavity 21. The second sealing member 40 is arranged in the containing cavity 21 and is used for sealingly connecting the box body 20 and the opposite end of the valve cage 123 along the first direction when the valve core assembly 12 is installed in the containing cavity 21.

[0056] Among them, please combine Figure 10 and Figure 11When the valve core assembly 12 is installed in the cavity 21, the first seal 30, the second seal 40, the cavity wall of the cavity 21 and the side wall of the valve cage 123 form a press gap 50 for communicating with the throttle hole 1231 of the valve cage 123. The box 20 is further provided with an inflow hole 23 communicating with the press gap 50, which is used for inputting the press medium into the press gap 50. The box 20 is further provided with an outflow hole 24 communicating with the fluid outlet 1221 of the valve core assembly 12, which is used for discharging the leaked press medium of the valve core assembly 12.

[0057] In the embodiment of the present application, the sealing verification device mainly consists of the box 20, the first seal 30 and the second seal 40. The box 20 is the main part of the sealing verification device, which is provided with a cavity 21. The cavity 21 provides an installation space for the valve core assembly 12 to be detected for sealing, i.e. the valve core assembly 12 is installed in the cavity 21 for sealing verification. The box 20 is provided with a first through hole 22 penetrating the cavity 21. When the valve core assembly 12 is installed in the cavity 21, the valve rod 124 connected to the valve core 121 extends out of the box 20 through the first through hole 22, so that the valve core 121 can move up and down in the valve cage 123 when the valve rod 124 is subjected to an axial force.

[0058] The first seal 30 is arranged in the cavity 21. When the valve core assembly 12 is installed in the cavity 21, one end of the valve cage 123 of the valve core assembly 12 along the first direction can be sealingly connected to the box 20 through the first seal 30, wherein the first direction is parallel to the moving direction of the valve core 121, i.e. the first direction is the axial direction of the valve rod 124. The cavity 21 is further provided with the second seal 40. When the valve core assembly 12 is installed in the cavity 21, the other end of the valve cage 123 of the valve core assembly 12 along the first direction is sealingly connected to the box 20 through the second seal 40. In this way, the first seal 30 sealingly connects the top end of the valve cage 123 along the first direction to the box 20, thereby sealing the upper part of the cavity 21. The second seal 40 sealingly connects the bottom end of the valve cage 123 along the first direction to the box 20. The first seal 30 and the second seal 40 cooperate to seal the valve cage 123 and the box 20 from two opposite directions, thereby preventing the medium in the cavity 21 from leaking from the connection position between the valve cage 123 and the box 20.

[0059] When the valve core assembly 12 is installed in the cavity 21, the first seal 30, the second seal 40, the cavity wall of the cavity 21 and the side wall of the valve cage 123 jointly enclose a space, i.e. the pressurization gap 50. The pressurization gap 50 is in communication with the throttling hole 1231 of the valve cage 123, so that the medium in the pressurization gap 50 can flow into the valve cage 123 through the throttling hole 1231. The box 20 is provided with an inflow hole 23 and an outflow hole 24. The inflow hole 23 is in communication with the pressurization gap 50, so that the fluid such as water or gas outside for testing the sealing property can be input into the pressurization gap 50, i.e. the inflow hole 23 is a channel for inputting the pressurization medium into the pressurization gap 50. When the sealing property is verified, a certain pressure of the medium is input into the pressurization gap 50 through the inflow hole 23, so as to simulate the pressure environment of the regulating valve in actual work, thereby detecting the sealing property of the valve core assembly 12. The outflow hole 24 is in communication with the fluid outlet 1221 of the valve core assembly 12, i.e. in communication with the fluid outlet 1221 of the valve seat 122. When the first sealing position 125 and the second sealing position 126 of the valve core assembly 12 exist leakage, the medium in the pressurization gap 50 can flow out from the leakage position and be discharged to the outside of the box 20 through the outflow hole 24. In this way, whether the valve core assembly 12 exists leakage can be determined by observing whether the pressurization medium exists in the outflow hole 24. Meanwhile, the leakage rate of the valve core assembly 12 can be obtained by measuring the outflow of the pressurization medium from the outflow hole 24, so as to evaluate whether the leakage of the valve core assembly 12 verified at present is within the allowable range.

[0060] It should be noted that the pressurization medium refers to a substance injected into a specific space or device to generate pressure when a pressure verification test (such as a pressurization test) is performed. In the embodiment of the present application, the pressurization medium is a substance injected into the pressurization gap 50 to generate pressure when the pressurization test is performed by using the cage type double seal structure regulating valve sealing property verification device of the present application. Specifically, it can be water, oil or gas.

[0061] The cage type double seal structure regulating valve sealing property verification device of the embodiment of the application, when in use, installs the valve core assembly 12 of the regulating valve to be subjected to sealing property verification into the cavity 21 of the box 20, and seals the two ends of the valve cage 123 of the valve core assembly 12 along the first direction with the box 20 through the first seal 30 and the second seal 40 respectively, and forms a press gap 50 between the valve cage 123 and the cavity wall of the cavity 21 of the box 20, and applies a certain axial pressure on the valve rod 124 to keep the valve core assembly 12 in a closed state, and the box 20 is provided with an inflow hole 23 communicating with the press gap 50, and the press gap 50 communicates with the throttling hole 1231 of the valve cage 123, and at the same time, the outflow hole 24 on the box 20 communicates with the fluid outlet 1221 of the valve seat 122 of the valve core assembly 12, so that the press medium is injected into the press gap 50 through the inflow hole 23, and by adjusting the input amount of the press medium and the axial pressure acting on the valve rod 124, the pressure environment in which the valve core assembly 12 is located when actually working can be simulated, and on this basis, when the valve core assembly 12 leaks, for example, the first sealing position 125 and / or the second sealing position 126 leaks, the press medium will continue to flow to the leakage position under the action of pressure after entering the valve cage 123 through the throttling hole 1231, and finally flows out to the outside of the box 20 through the outflow hole 24 on the box 20, so that when the valve core assembly 12 is installed in the cavity 21, and when at least one of the first sealing position 125 and the second sealing position 126 of the valve core assembly 12 leaks, whether the valve core assembly 12 leaks can be determined by observing whether the press medium flows out of the outflow hole 24, and at the same time, by measuring the outflow amount of the press medium flowing out of the outflow hole 24, the leakage rate of the valve core assembly 12 can be obtained, so as to evaluate whether the leakage of the valve core assembly 12 subjected to verification is within an allowable range. In this way, without disassembling the valve body 11 of the regulating valve from the equipment, the valve body of the regulating valve is simulated through the box 20, so that the sealing property inspection of the valve core assembly 12 can be realized, the difficulty of sealing verification of the double seal structure regulating valve is reduced, the operation process is simplified, and the efficiency and accuracy of the sealing property verification are improved.

[0062] Please combine Figure 5 , Figure 6 and Figure 11 , in the specific use process, after the press medium enters the press gap 50, when there is leakage between the first sealing position 125, i.e., the sealing surface between the valve core 121 and the valve seat 122, of the valve core assembly 12, the press medium enters the valve cage 123 from the inflow hole 23, the throttling hole 1231 along the solid line arrow, and will continue to flow to the leakage position along the dashed line arrow under the action of pressure, and finally flows out to the outside of the box 20 through the outflow hole 24 on the box 20. Figure 11The medium-dashed arrow indicates the direction of leakage from between the valve core 121 and the valve seat 122; when there is leakage between the second sealing position 126 of the valve core assembly 12, i.e. between the sealing surface of the valve core 121 and the compression ring 127, the pressurized medium enters the valve cage 123 from the inlet hole 23, the throttling hole 1231, and then continues to flow along the Figure 11 The medium-dashed arrow indicates the direction of leakage from between the valve core 121 and the valve seat 122; when there is leakage between the second sealing position 126 of the valve core assembly 12, i.e. between the sealing surface of the valve core 121 and the compression ring 127, the pressurized medium enters the valve cage 123 from the inlet hole 23, the throttling hole 1231, and then continues to flow along the

[0063] In some embodiments, the cage double-seal structure regulating valve sealing verification device further comprises a pressurizing tool (not shown in the figure) arranged outside the container cavity 21 and configured to provide a pressurizing force to the valve stem 124 of the valve core assembly 12 installed in the container cavity 21.

[0064] The pressurizing tool is arranged outside the box 20 and is configured to provide a pressurizing force to the valve stem 124 of the valve core assembly 12 installed in the container cavity 21. By applying pressure to the valve stem 124, the force acting on the regulating valve in actual operation is simulated, and the sealing performance of the valve core assembly 12 under different pressures is detected.

[0065] Specifically, when the pressurizing tool applies pressure to the valve stem 124, the valve stem 124 transmits the force to the valve core 121, so that a certain compression force is generated between the valve core 121 and the valve seat 122, thereby verifying whether the sealing performance between the valve core 121 and the valve seat 122 is good. For example, if there is no leakage of the pressurized medium or the amount of the pressurized medium leaked within a fixed time meets the requirements under a certain pressure, it indicates that the sealing performance between the valve core 121 and the valve seat 122 meets the requirements. In this way, the sealing performance of the cage double-seal structure regulating valve under different pressures can be effectively verified, and the accuracy of the sealing verification is improved.

[0066] In this embodiment, it can be understood that the pressurizing tool is a professional tool for pressurizing test, which applies a certain pressure to the tested object to verify its sealing performance and strength.

[0067] In specific embodiments, the pressurizing tool can be a manual pressurizing pump, a hydraulic pressurizing pump, or an air pressure pressurizing pump, etc.

[0068] In some embodiments, as shown in FIG. 4, the pressurizing tool comprises a pressurizing pump 41, a pressurizing pipe 42, and a pressurizing nozzle 43. Figures 5 to 7As shown, the box body 20 comprises a first pressing plate 201, a second pressing plate 202 and a frame 203, the first pressing plate 201 and the second pressing plate 202 are arranged in parallel and spaced apart along a first direction, one end of the frame 203 along the first direction is sealingly connected with the first pressing plate 201, the other end of the frame 203 along the first direction is sealingly connected with the second pressing plate 202, the first pressing plate 201, the frame 203 and the second pressing plate 202 together form a cavity 21, the inflow hole 23 is arranged on the frame 203, the first sealing element 30 is installed on the first pressing plate 201, and the second sealing element 40 is installed on the second pressing plate 202; wherein, the first pressing plate 201 and the second pressing plate 202 are further provided with a connecting assembly 60, and the connecting assembly 60 is used for connecting the first pressing plate 201 and the second pressing plate 202 along the first direction.

[0069] In the embodiment of the present application, the box body 20 comprises a first pressing plate 201, a second pressing plate 202 and a frame 203, the first pressing plate 201 and the second pressing plate 202 are arranged in parallel and spaced apart along a first direction, and the frame 203 is connected between the first pressing plate 201 and the second pressing plate 202. Moreover, one end of the frame 203 along the first direction is sealingly connected with the first pressing plate 201, and the other end of the frame 203 along the first direction is sealingly connected with the second pressing plate 202, and the first pressing plate 201, the frame 203 and the second pressing plate 202 together form a cavity 21. The first sealing element 30 is installed on the first pressing plate 201, and the second sealing element 40 is installed on the second pressing plate 202. When the spool assembly 12 is installed in the cavity 21, please also combine with Figure 10 and Figures 5 to 7 , the first sealing element 30 sealingly connects one end of the box body 20 and the valve cage 123 along the first direction, and the second sealing element 40 sealingly connects the other end of the box body 20 and the valve cage 123 along the first direction, so as to form a pressing gap 50 together with the cavity wall of the cavity 21 and the side wall of the valve cage 123.

[0070] The first pressing plate 201 and the second pressing plate 202 are further provided with a connecting assembly 60, and the connecting assembly 60 is used for connecting the first pressing plate 201 and the second pressing plate 202 along the first direction. By adjusting the connecting force of the connecting assembly 60, the clamping degree of the first pressing plate 201 and the second pressing plate 202 to the spool assembly 12 can be changed, so that the first sealing element 30 and the second sealing element 40 can realize the sealing of the connecting position of the frame 203 and the first pressing plate 201 and the second pressing plate 202 under the action of sufficient extrusion force.

[0071] In some embodiments, as Figures 5 to 7As shown, the connecting assembly 60 comprises a screw rod 61 and a nut 62, the screw rod 61 is arranged along the first direction, one end of the screw rod 61 is fixedly connected with one of the first pressing plate 201 and the second pressing plate 202, the other end of the screw rod 61 is a threaded segment 611 and penetrates the other of the first pressing plate 201 and the second pressing plate 202, the nut 62 is screwed on the threaded segment 611 and can rotate along the first direction to press the adjacent first pressing plate 201 or second pressing plate 202.

[0072] In the embodiment, the connecting assembly 60 comprises the screw rod 61 and the nut 62, the screw rod 61 is arranged along the first direction, i.e. the length direction of the screw rod 61 is parallel to the first direction. One end of the screw rod 61 is fixedly connected with one of the first pressing plate 201 and the second pressing plate 202, the other end of the screw rod 61 is a threaded segment 611, the threaded segment 611 has an external thread matched with the nut 62, and the threaded segment 611 penetrates the other of the first pressing plate 201 and the second pressing plate 202. Exemplarily, one end of the screw rod 61 is fixed to the first pressing plate 201 and the threaded segment 611 penetrates the second pressing plate 202; or, one end of the screw rod 61 is fixed to the second pressing plate 202 and the threaded segment 611 penetrates the first pressing plate 201.

[0073] In this way, the first pressing plate 201 and the second pressing plate 202 are connected by the screw rod 61 along the first direction, and the nut 62 is connected with the threaded segment 611 of the screw rod 61 through the thread. When the nut 62 rotates along the first direction, the nut 62 will move along the first direction on the screw rod 61 due to the thread. With the rotation and movement of the nut 62, the nut 62 presses the adjacent first pressing plate 201 or second pressing plate 202. For example, if the nut 62 rotates on the threaded segment 611 penetrating the second pressing plate 202, the nut 62 will press the second pressing plate 202 to make it close to the first pressing plate 201; vice versa. In this way, by rotating the nut 62, the pressing force between the first pressing plate 201 and the second pressing plate 202 can be adjusted, and then the connecting force between the first pressing plate 201 and the second pressing plate 202 can be changed, so as to ensure that the first sealing element 30 and the second sealing element 40 can realize reliable sealing.

[0074] In some embodiments, as shown in FIG. 2, the first pressing plate 201 has a first edge portion 2011 outside the accommodating cavity 21, the second pressing plate 202 has a second edge portion 2021 outside the accommodating cavity 21, and the screw rod 61 connects the first edge portion 2011 and the second edge portion 2021. Figures 5 to 7

[0075] ​In the embodiment, the screw rod 61 is mechanically connected to the first pressing plate 201 and the second pressing plate 202 outside the cavity 21 by connecting the first edge 2011 of the first pressing plate 201 and the second edge 2021 of the second pressing plate 202, so that the screw rod 61 can effectively transmit the force generated by the rotation of the nut 62 to the first pressing plate 201 and the second pressing plate 202 during the adjustment process, thereby achieving the adjustment of the extrusion force between the two pressing plates. At the same time, since the screw rod 61 and the nut 62 are arranged on the edge outside the cavity 21, the arrangement of the screw rod 61 and the nut 62 does not interfere with the space for installing the valve core assembly 12 and the sealing structure in the cavity 21, ensuring the integrity and sealing of the internal structure of the cavity 21, so that the entire sealing verification device can work normally.

[0076] In some embodiments, as shown in Figures 5 to 7 the center line of the cavity 21, the center line of the first pressing plate 201 and the center line of the second pressing plate 202 coincide, and the box body 20 is provided with a plurality of connecting assemblies 60, and the plurality of connecting assemblies 60 are arranged around the first through hole 22.

[0077] In the embodiment, the center lines of the first pressing plate 201 and the second pressing plate 202 coincide with the center line of the cavity 21, which means that the first pressing plate 201 and the second pressing plate 202 are evenly distributed at both ends of the cavity 21, so that the force of the first pressing plate 201 and the second pressing plate 202 acting on the first sealing element 30, the second sealing element 40 and the frame 203 is more uniform, avoiding uneven force caused by the position deviation of the components, and improving the reliability of the sealing.

[0078] On this basis, the box body 20 is provided with a plurality of connecting assemblies 60, and the plurality of connecting assemblies 60 are arranged around the first through hole 22, wherein the first through hole 22 is a passage for the valve rod 124 of the valve core assembly 12 to extend out, and the plurality of connecting assemblies 60 are distributed around the first through hole 22. The plurality of connecting assemblies 60 are evenly connected to the first pressing plate 201 and the second pressing plate 202, and then evenly adjust the connecting force between the first pressing plate 201 and the second pressing plate 202, so that the pressure received by the first sealing element 30 and the second sealing element 40 is uniform in the circumferential direction.

[0079] In some embodiments, as shown in Figures 5 to 7 the first pressing plate 201 or the second pressing plate 202 is also provided with an exhaust hole 25 for communicating with the pressing gap 50, and the exhaust hole 25 is provided with an exhaust valve 251.

[0080] The first pressing plate 201 or the second pressing plate 202 is provided with an exhaust hole 25 communicating with the pressing gap 50, and the exhaust hole 25 is connected with an exhaust valve 251. When the pressing test is carried out, please refer to Figure 10 and Figure 11When the pressurizing medium is filled into the pressurizing gap 50 through the inflow hole 23, the exhaust valve 251 is opened, and the air in the pressurizing gap 50 is discharged through the exhaust valve 251, so as to facilitate the rapid filling of the pressurizing medium into the pressurizing gap 50. When the pressurizing medium filling work is completed and the test requirements are met, the exhaust valve 251 is closed to prevent the pressurizing medium from leaking from the exhaust hole 25, and to ensure the sealing and accuracy of the pressure test. Finally, when the sealing verification is completed, the exhaust valve 251 is opened first to discharge the gas in the pressurizing gap 50, thereby reducing the risk of structural damage caused by pressure when the valve core assembly 12 is removed.

[0081] In specific embodiments, as shown in Figures 6 to 8 , the first sealing member 30 is provided with a bypass hole 34 penetrating through the first sealing member 30 in the first direction, and the bypass hole 34 is located opposite to the exhaust hole 25 to communicate the cavity 21 and the exhaust hole 25.

[0082] In some embodiments, as shown in Figures 5 to 7 , the first through hole 22 is provided in the first pressing plate 201, and the first sealing member 30 includes a first sealing part 31 and a second sealing part 32. The first sealing part 31 is clamped between the frame 203 and the first pressing plate 201 to seal and connect the frame 203 and the first pressing plate 201. The second sealing part 32 is located in the cavity 21 and surrounds the first through hole 22, and is used to abut and seal the top surface of the valve cage 123.

[0083] In the present embodiment, please refer to Figure 10 and Figure 11 , the first through hole 22 is provided in the first pressing plate 201, and the first sealing member 30 includes a first sealing part 31 and a second sealing part 32. The first sealing part 31 is clamped between the frame 203 and the first pressing plate 201 to seal and connect the frame 203 and the first pressing plate 201, so as to prevent the pressurizing medium in the cavity 21 from leaking out from the connection between the frame 203 and the first pressing plate 201, thereby ensuring the sealing of the cavity 21 and providing a prerequisite for accurately verifying the sealing of the valve core assembly 12. The second sealing part 32 is located in the cavity 21 and surrounds the first through hole 22, and the valve rod 124 passes through the first pressing plate 201. The second sealing part 32 is arranged around the first through hole 22 and tightly abuts the top surface of the valve cage 123, thereby sealing and connecting the top surface of the valve cage 123 and the first pressing plate 201. In this way, the pressurizing medium can be prevented from leaking from the gap between the top surface of the valve cage 123 and the first pressing plate 201, and the sealing of the entire device is further enhanced, so as to ensure that, when the sealing of the valve core assembly 12 is verified, the pressurizing medium can only leak through the possible leakage position of the valve core assembly 12 itself, thereby accurately detecting whether the valve core assembly 12 has a leakage.

[0084] In some embodiments, as shown in Figures 5 to 7As shown, the outflow hole 24 is arranged on the second pressing plate 202, the second sealing member 40 comprises a third sealing part 41 and a fourth sealing part 42, the third sealing part 41 is arranged between the frame 203 and the second pressing plate 202 to seal the connection between the frame 203 and the second pressing plate 202, and the fourth sealing part 42 is arranged in the cavity 21 and surrounds the outflow hole 24, and is used to abut and seal the valve seat 122 which is sealingly connected to the bottom surface of the valve cage 123.

[0085] In this embodiment, the second pressing plate 202 is arranged below the cavity 21 along the first direction, and the outflow hole 24 is arranged on the second pressing plate 202, i.e., the outflow hole 24 is arranged below the fluid outlet 1221 of the valve seat 122, so that the leaked pressurizing medium can flow out of the outflow hole 24 under the action of gravity.

[0086] In this embodiment, please refer to Figure 10 and Figure 11 together, the second sealing member 40 comprises a third sealing part 41 and a fourth sealing part 42, the third sealing part 41 is arranged between the frame 203 and the second pressing plate 202 to seal the connection between the frame 203 and the second pressing plate 202, and prevent the pressurizing medium in the cavity 21 from leaking out of the connection between the frame 203 and the second pressing plate 202, thereby ensuring the sealing of the cavity 21 and providing a prerequisite for accurately verifying the sealing performance of the valve core assembly 12. The fourth sealing part 42 is arranged in the cavity 21 and surrounds the outflow hole 24, and tightly abuts the bottom surface of the valve seat 122, thereby sealing the connection between the valve seat 122 and the second pressing plate 202. In this way, the pressurizing medium can be prevented from leaking from the gap between the valve seat 122 and the second pressing plate 202, and it is ensured that the pressurizing medium can only leak through the possible leakage position of the valve core assembly 12 itself when verifying the sealing performance of the valve core assembly 12.

[0087] In some embodiments, as shown in Figures 6 to 8 , one side of the first pressing plate 201 facing the second pressing plate 202 is provided with a first recess 2012 recessed along the first direction, the first through hole 22 is arranged on the bottom of the first recess 2012, and the first sealing member 30 is embedded in the first recess 2012.

[0088] The first pressing plate 201 is provided with the first recess 2012 on the surface opposite to the second pressing plate 202, and the first sealing member 30 is embedded in the first recess 2012, so that a tight fit is formed between the first sealing member 30 and the first pressing plate 201, which helps to improve the sealing effect. At the same time, the first sealing member 30 is embedded in the first recess 2012, which can better fix the position of the first sealing member 30 and reduce the risk of displacement of the first sealing member 30, thereby ensuring that it can effectively realize the sealing function.

[0089] Similarly, as shown in Figure 6 , Figure 7 andFigure 8 As shown, the second pressing plate 202 is provided with a second groove 2022 recessed along the first direction on the side facing the first pressing plate 201, the outlet hole 24 is arranged on the groove bottom of the second groove 2022, and the second sealing element 40 is embedded in the second groove 2022. The second sealing element 40 is embedded in the second groove 2022, so that a close fit is formed between the second sealing element 40 and the second pressing plate 202, thereby improving the sealing effect of the second sealing element 40.

[0090] In some embodiments, as shown in Figures 6 to 9 As shown, the groove bottom of the second groove 2022 is further provided with a third groove 2023 recessed along the first direction, and when the valve core assembly 12 is installed in the cavity 21, the bottom of the valve seat 122 is embedded in the third groove 2023, and the third groove 2023 limits the valve seat 122, as shown in Figure 11 As shown, so that the valve core assembly 12 can be fixedly installed in the cavity 21 and will not move during the sealing verification process.

[0091] In some embodiments, as shown in Figure 6 , Figure 7 and Figure 8 As shown, the first sealing element 30 is provided with a second through hole 33, the second through hole 33 is located below the first through hole 22 along the first direction, the center line of the first through hole 22 coincides with the center line of the second through hole 33, and the projection of the second through hole 33 along the first direction covers the first through hole 22.

[0092] In this embodiment, the first sealing element 30 is provided with a second through hole 33, the second through hole 33 is located directly below the first through hole 22, the projection area of the second through hole 33 is greater than that of the first through hole 22, that is, the second through hole 33 can completely cover the first through hole 22, the hole diameter of the second through hole 33 is greater than that of the first through hole 22, the valve rod 124 can pass through smoothly while providing sufficient sealing space for the first sealing element 30, ensuring that the first sealing element 30 can effectively seal the surrounding of the first through hole 22, and reducing the risk of leakage of the medium in the cavity 21 from the gap between the first through hole 22 and the valve rod 124.

[0093] In some embodiments, at least one of the first sealing element 30 and the second sealing element 40 is an elastic element.

[0094] That is, one or both of the first sealing element 30 and the second sealing element 40 is made of a material with elasticity. Among them, the elastic element can deform under the action of external force, and can restore to the original shape after the external force disappears. In the sealing structure, the elastic element can better adapt to different working conditions and the fit difference between parts due to its such characteristics.

[0095] In the embodiment, when the extrusion force between the first pressing plate 201 and the second pressing plate 202 changes, the first sealing member 30 and the second sealing member 40 can better adhere to the sealing structure connected thereto by self-deformation, thereby improving the sealing performance.

[0096] In specific embodiments, the first sealing member 30 and the second sealing member 40 can be elastic rubber rings or elastic silica gel rings, etc.

[0097] In some embodiments, as shown in Figure 6 , Figure 7 and Figure 8 , the second pressing plate 202 is further connected with a flow collector 70, the inlet of the flow collector 70 covers the outflow hole 24, and the outlet of the flow collector 70 is used to connect with a metering device for metering the volume or weight of the pressing medium.

[0098] In the embodiment, the second pressing plate 202 is further connected with the flow collector 70 at the lower part in the first direction, the flow collector 70 is part of the entire device, and is connected with the second pressing plate 202 to collect and guide the pressing medium flowing out of the outflow hole 24. The inlet of the flow collector 70 covers the outflow hole 24, so that the pressing medium flowing out of the outflow hole 24 can all enter the flow collector 70, so as to achieve effective collection of the pressing medium. The outlet of the flow collector 70 is further connected with a metering device for metering the volume or weight of the pressing medium, so that the pressing medium flowing out of the outflow hole 24 and collected by the flow collector 70 can be delivered into the metering device, thereby achieving accurate measurement of the volume or weight of the pressing medium, so that by measuring the loss amount (measured by volume or weight) of the pressing medium, it can be determined whether there is leakage of the valve core assembly 12 under the experimental pressure and the degree of the leakage.

[0099] In specific embodiments, the metering device can be a measuring cylinder or a measuring cup for metering volume, or can also be a balance for metering mass.

[0100] The above description of the various embodiments tends to emphasize the differences between the various embodiments, and the same or similar parts can be referred to each other, and for the sake of brevity, will not be repeated here.

[0101] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Any modifications, equivalent replacements and improvements made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A cage double seal structure regulating valve seal verification device, characterized by, The utility model relates to a valve core assembly pressure test device, comprising: a box body provided with a cavity for mounting a valve core assembly to be detected, the box body being provided with a first through hole penetrating through the cavity for the valve rod of the valve core assembly to extend out; a first sealing member arranged in the cavity and used for sealingly connecting one end of the valve cage of the valve core assembly along a first direction when the valve core assembly is mounted in the cavity; a second sealing member arranged in the cavity and used for sealingly connecting the other end of the valve cage along the first direction when the valve core assembly is mounted in the cavity; wherein, when the valve core assembly is mounted in the cavity, the first sealing member, the second sealing member, the cavity wall and the side wall of the valve cage form a pressing gap, the pressing gap is used for communication with the throttle hole of the valve cage, the box body is further provided with an inlet hole communicating with the pressing gap, the inlet hole is used for inputting the pressing medium into the pressing gap, and the box body is further provided with an outlet hole communicating with the fluid outlet of the valve core assembly, the outlet hole is used for discharging the leaked pressing medium of the valve core assembly; the box body comprises a first pressing plate, a second pressing plate and a frame, the first pressing plate and the second pressing plate are arranged in parallel and spaced apart along a first direction, one end of the frame along the first direction is sealingly connected with the first pressing plate, the other end of the frame along the first direction is sealingly connected with the second pressing plate, the first pressing plate, the frame and the second pressing plate form the cavity, the inlet hole is arranged in the frame, the first sealing member is mounted on the first pressing plate, and the second sealing member is mounted on the second pressing plate; the first through hole is arranged in the first pressing plate, the first sealing member comprises a first sealing part and a second sealing part, the first sealing part is clamped between the frame and the first pressing plate to sealingly connect the frame and the first pressing plate, and the second sealing part is arranged in the cavity and surrounds the first through hole, and the second sealing part is used for abutting and sealing with the top surface of the valve cage; the outlet hole is arranged in the second pressing plate, the second sealing member comprises a third sealing part and a fourth sealing part, the third sealing part is clamped between the frame and the second pressing plate to sealingly connect the frame and the second pressing plate, the fourth sealing part is arranged in the cavity and surrounds the outlet hole, and the fourth sealing part is used for abutting and sealing with the valve seat sealingly connected with the bottom surface of the valve cage.

2. The cage double seal structure regulating valve seal verification device according to claim 1, wherein a connecting assembly is further arranged between the first pressing plate and the second pressing plate, and the connecting assembly is used for connecting the first pressing plate and the second pressing plate along the first direction.

3. The cage double seal structure regulating valve seal verification device of claim 2, wherein, the connecting assembly comprises a screw rod and a nut arranged along the first direction, one end of the screw rod is fixedly connected with one of the first pressing plate and the second pressing plate, the other end of the screw rod is a threaded segment and penetrates through the other one of the first pressing plate and the second pressing plate, the nut is screwed on the threaded segment, and the nut can rotate along the first direction to extrude the adjacent first pressing plate or second pressing plate.

4. The cage double seal trim valve seal integrity verification device of claim 1, wherein, One side of the first pressing plate facing the second pressing plate is provided with a first groove recessed along the first direction, the first through hole is arranged at the groove bottom of the first groove, and the first sealing piece is embedded in the first groove; And / or, one side of the second pressing plate facing the first pressing plate is provided with a second groove recessed along the first direction, the outflow hole is arranged at the groove bottom of the second groove, and the second sealing piece is embedded in the second groove.

5. The cage double seal trim valve seal integrity verification device of claim 1, wherein, The first sealing piece is provided with a second through hole, the second through hole is below the first through hole along the first direction, the center line of the first through hole coincides with the center line of the second through hole, and the projection of the second through hole along the first direction covers the first through hole.

6. The cage double seal trim valve seal integrity verification device of claim 1, wherein, The second pressing plate is further connected with a flow collecting piece, the inlet of the flow collecting piece covers the outflow hole, and the outlet of the flow collecting piece is used for being connected with a metering device for metering the volume or weight of the pressing medium.

7. The cage double seal structure regulating valve seal verification device according to any one of claims 1 to 6, characterized in that, At least one of the first sealing piece and the second sealing piece is an elastic piece.

8. The cage double seal structure regulating valve seal verification device according to any one of claims 1 to 6, characterized in that, The first pressing plate or the second pressing plate is further provided with an exhaust hole for being communicated with the pressing gap, and the exhaust hole is provided with an exhaust valve.

9. The cage double seal structure regulating valve seal verification device according to any one of claims 1 to 6, wherein The cage type double-seal structure regulating valve sealing property verification device further comprises a pressing tool, the pressing tool is arranged outside the cavity, and is used for providing a pressing force to the valve rod of the valve core assembly arranged in the cavity.

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