Pressure testing device of metal annular connecting surface valve

Abstract

The utility model discloses a pressure testing device for a metal annular connecting surface valve, belongs to the technical field of valve pressure testing devices, and aims to solve the problems that a sealing blind plate needs to be frequently assembled and disassembled when a traditional valve pressure testing device is used for testing the pressure of a metal annular gasket valve and other valves with special-shaped valve ports; a hydraulic jack is arranged in a frame, a pressure test valve is arranged between the hydraulic jack and the frame, and the pressure test valve, the hydraulic jack and the frame are arranged in a sealed mode through a first sealing plate, a second sealing plate and two sets of oval sealing gaskets. The first sealing plate corresponds to the liquid inlet end of the pressure testing valve, the second sealing plate corresponds to the liquid outlet end of the pressure testing valve, one end of the pressure testing pipeline assembly is communicated with the water storage tank, and the other end of the pressure testing pipeline assembly is communicated with the liquid inlet end of the pressure testing valve through the first sealing plate. The device is mainly used for testing the pressure of the valve.

Description

Technical Field

[0001] The utility model belongs to the technical field of valve pressure testing devices, and in particular relates to a pressure testing device for a metal annular connection surface valve. Background Art

[0002] When installing chemical equipment in the wild or remote construction sites, valve pressure tests are required, especially for valves in pipelines with flammable, explosive or toxic media, which require 100% hydraulic sealing performance tests. Usually, during the valve pressure test, a sealing blind plate is required to seal the valve and the pressure test device. When arranging the sealing blind plate, multiple fastening bolts are required to load and unload the sealing blind plate. During the test, the sealing blind plate needs to be in rigid contact with the valve port flange of the valve. Generally speaking, the service life of a sealing blind plate is about 20 to 25 times. Therefore, the sealing blind plate needs to be frequently replaced during the pressure test of each valve in a large pump group, which is extremely This wastes a lot of manpower and material resources and affects the economy of valve pressure testing. In particular, the gaskets of some metal ring connection surface valves are elliptical or octagonal, and a larger sealing blind plate is required during the pressure test. The sealing groove structure on the upper part of the special-shaped connection surface is also special-shaped. During the pressure test, the sealing blind plate will be thickened in order to fully ensure the sealing performance due to the long size of the connection surface. This leads to a significant increase in the working cost of the valve pressure test. Therefore, in order to reduce the pressure test cost of valves with metal ring connection surfaces, reduce the frequency of disassembly of the sealing blind plate during the pressure test, and reduce the loss of manpower and material resources, a pressure test device for valves with metal ring connection surfaces is developed. Utility Model Content

[0003] The utility model provides a pressure testing device for metal ring connection surface valves to solve the problem that the sealing blind plate needs to be frequently installed and uninstalled during the pressure testing of special-shaped valve port valves such as metal ring connection surface valves, which greatly wastes the manpower cost and material cost in the pressure testing work;

[0004] A pressure test device for a metal annular connection surface valve, the pressure test device comprising a frame, a hydraulic jack, a No. 1 sealing plate, a No. 2 sealing plate, two groups of sealing washers and a pressure test pipeline assembly, the hydraulic jack is arranged in the frame, and the hydraulic jack is fixedly connected to the frame, the pressure test valve is arranged between the hydraulic jack and the frame, and the pressure test valve is sealed with the hydraulic jack and the frame through the No. 1 sealing plate, the No. 2 sealing plate and the two groups of sealing washers, the No. 1 sealing plate is arranged correspondingly to the liquid inlet end of the pressure test valve, the No. 2 sealing plate is arranged correspondingly to the liquid outlet end of the pressure test valve, one end of the pressure test pipeline assembly is connected to a water storage tank, and the other end of the pressure test pipeline assembly is connected to the liquid inlet end of the pressure test valve through the No. 1 sealing plate;

[0005] Furthermore, the pressure test pipeline assembly includes a water inlet valve, a pressure test water pipe, a standard pressure gauge group and a pressure gauge, one end of the pressure test water pipe is connected to the water storage tank, the other end of the pressure test water pipe is connected to the liquid inlet end of the pressure test valve through a No. 1 sealing plate, and the water inlet valve, the pressure gauge and the standard pressure gauge group are sequentially connected in series on the pressure test water pipe along the water inlet flow direction;

[0006] Furthermore, a discharge branch pipe is provided on the pressure test water pipe between the water inlet valve and the pressure gauge, one end of the discharge branch pipe is connected to the pressure test water pipe, the other end of the discharge branch pipe is connected to the water storage tank, and a stop valve is connected in series on the discharge branch pipe;

[0007] Furthermore, an exhaust branch pipe is connected in series between the standard pressure gauge group and the No. 1 sealing plate on the pressure test water pipe, one end of the exhaust branch pipe is connected to the pressure test water pipe, and the other end of the exhaust branch pipe is connected to the external air, and an exhaust valve is connected in series on the exhaust branch pipe;

[0008] Further, a valve flange is provided on the water inlet and outlet ends of the pressure test valve, and the valve flange is fixedly connected to the pressure test valve, and N sealing ring grooves are processed on the end face of the valve flange away from the pressure test valve, N is a positive integer, and the N sealing ring grooves are coaxially sleeved in sequence from small to large along the diameter of the ring groove, each group of sealing gaskets includes N sealing gaskets, and each sealing gasket is correspondingly embedded in a sealing ring groove, and N No. 1 matching ring grooves are processed on the end face of the No. 1 sealing plate that matches the valve flange, and each No. 1 matching ring groove is correspondingly arranged with a sealing ring groove, and the No. 1 sealing plate is sealed and matched with the corresponding valve flange through a group of sealing gaskets, and N No. 2 matching ring grooves are processed on the end face of the No. 2 sealing plate that matches the valve flange, and each No. 2 matching ring groove is correspondingly arranged with a sealing ring groove, and the No. 2 sealing plate is sealed and matched with the corresponding valve flange through another group of sealing gaskets;

[0009] Further, the cross section of the sealing gasket is an ellipse or an octagon, and the cross section of the No. 1 matching ring groove is the same as the cross section of the No. 2 matching ring groove, both of which are isosceles trapezoids;

[0010] Furthermore, an L-shaped through hole is processed in the No. 1 sealing plate, one end of the L-shaped through hole is connected to the bottom end of the No. 1 sealing plate, and one end of the L-shaped through hole is corresponding to the liquid inlet end of the pressure test valve, and the other end of the L-shaped through hole is connected to the outer circumferential surface of the No. 1 sealing plate, and a water pipe interface is installed on the other end of the L-shaped through hole, and the other end of the L-shaped through hole is connected to the pressure test water pipe through the water pipe interface;

[0011] Further, the frame includes an upper frame unit and a lower frame unit, the upper frame unit is inserted on the lower frame unit, and the upper frame unit is detachably connected to the lower frame unit, the upper frame unit includes a top plate and multiple groups of plug-in columns, the multiple groups of plug-in columns are equidistantly arranged on the lower surface of the top plate along the length extension direction of the top plate, each group of plug-in columns includes two plug-in columns, the two plug-in columns in the same group are symmetrically arranged along the center line of the width direction of the top plate, and the top end of each plug-in column is fixedly connected to the lower surface of the top plate, the lower frame unit includes a bottom plate and multiple groups of plug-in sleeves, the multiple groups of plug-in sleeves are equidistantly arranged on the upper surface of the bottom plate along the length extension direction of the bottom plate, each group of plug-in sleeves includes two plug-in sleeves, the two plug-in sleeves in the same group are symmetrically arranged along the center line of the width direction of the top plate, and the top end of each plug-in sleeve is fixedly connected to the upper surface of the bottom plate, each plug-in column in the upper frame unit is correspondingly inserted in a plug-in sleeve in the lower frame unit, and each plug-in column is detachably connected to a corresponding plug-in sleeve through an adjustable pin;

[0012] Further, the hydraulic jack is arranged on the upper surface of the bottom plate in the vertical direction, and the hydraulic jack is fixedly connected to the bottom plate, the pressure test valve is arranged between the hydraulic jack and the top plate, and the valve flange at the water inlet end of the pressure test valve is sealed with a No. 1 sealing plate located on the lower surface of the top plate through a set of sealing gaskets, and the valve flange at the water outlet end of the pressure test valve is sealed with a No. 2 sealing plate located on the top of the hydraulic jack through another set of sealing gaskets;

[0013] Furthermore, the hydraulic jack is vertically arranged on the lower surface of the top plate, and the hydraulic jack is fixedly connected to the top plate, the pressure test valve is arranged between the hydraulic jack and the bottom plate, and the valve flange at the water inlet end of the pressure test valve is sealed with a sealing plate No. 1 located at the bottom of the hydraulic jack through a group of sealing gaskets, and the valve flange at the water outlet end of the pressure test valve is sealed with a sealing plate No. 2 located on the upper surface of the bottom plate through another group of sealing gaskets.

[0014] The beneficial effects of this application compared to the prior art are as follows:

[0015] The pressure test device for a metal annular connection surface valve proposed in the present application utilizes a sealing gasket as the main sealing component, thereby avoiding rigid contact between the sealing blind plate and the valve flange, and extending the service life of the sealing blind plate to the maximum extent under the premise of ensuring sufficient sealing. Considering that the production cost of the sealing gasket is much lower than that of the sealing blind plate, and the service life of the sealing gasket is about 10 to 15 times, it is only necessary to replace the sealing gasket accordingly for the pressure test. After the sealing gasket is introduced, the service life of the sealing blind plate can be directly increased from the traditional 20 to 25 times to 100 to 115 times, which greatly reduces the replacement frequency and use cost of the sealing blind plate, greatly reduces the manpower and material resources consumed during the test, and reduces the test cost of the valve test;

[0016] At the same time, in order to ensure the sealing stability of the sealing gasket, the present application optimizes the structure of the sealing gasket and adopts a sealing gasket with an elliptical or octagonal cross-section, so that it can be fully fitted with the mating ring groove and the sealing ring groove under the action of extrusion force to meet the needs of high-pressure sealing.

[0017] The present application provides a pressure testing device for a metal ring connection surface valve, which can be reasonably planned into two layout modes according to the weight of the valve body. One is to arrange the valve at a high place for testing, and the other is to arrange the valve at a low place for testing. The two arrangements are determined by the overall weight of the valve. If the valve is lighter, the first pressure testing mode can be adopted. If the valve is heavier, the second pressure testing mode can be adopted. This design can make the pressure testing work more flexible. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the structure of the pressure test device described in this application (lightweight valve body, high-altitude test);

[0019] Figure 2 This is a schematic diagram of the structure of the pressure test device described in this application (heavy valve body, low position test);

[0020] Figure 3 This is a schematic diagram of the structure of the No. 1 sealing plate in the pressure test device described in this application;

[0021] Figure 4 This is a schematic diagram of the installation of the No. 1 sealing plate in the pressure test device described in this application;

[0022] Figure 5 This is a schematic diagram of the installation of the No. 2 sealing plate in the pressure test device described in this application;

[0023] Figure 6 It is a cross-sectional schematic diagram of a No. 1 matching ring groove in the pressure test device described in this application;

[0024] Figure 7 This is a schematic diagram of the structure of the frame in the pressure test device described in this application;

[0025] Figure 8 This is a schematic diagram of the working state of the pressure test device described in this application.

[0026] In the figure, 1 frame, 1-1 top plate, 1-2 plug-in column, 1-3 plug-in sleeve, 1-4 bottom plate, 2 hydraulic jack, 3 pressure test valve, 4 exhaust valve, 5 No. 1 sealing plate, 6 water inlet valve, 7 stop valve, 8 pressure test water pipe, 9 sealing gasket, 10 standard pressure gauge group, 11 pressure gauge, 12 adjustable pin, 13 No. 2 sealing plate, 14 water pipe interface, 15 No. 1 matching ring groove, 16 valve flange, 17 No. 2 matching ring groove, A parallel first test group, B parallel second test group and C parallel third test group. DETAILED DESCRIPTION

[0027] Specific implementation method 1: Combination Figures 1 to 8 To explain the present embodiment, a pressure test device for a metal ring connection surface valve is provided in the present embodiment, the pressure test device comprises a frame 1, a hydraulic jack 2, a No. 1 sealing plate 5, a No. 2 sealing plate 13, two groups of sealing gaskets 9 and a pressure test pipe assembly, the hydraulic jack 2 is arranged in the frame 1, and the hydraulic jack 2 is fixedly connected to the frame 1, the pressure test valve 3 is arranged between the hydraulic jack 2 and the frame 1, and the pressure test valve 3 is sealed with the hydraulic jack 2 and the frame 1 through the No. 1 sealing plate 5, the No. 2 sealing plate 13 and the two groups of sealing gaskets 9, the No. 1 sealing plate 5 is arranged corresponding to the liquid inlet end of the pressure test valve 3, the No. 2 sealing plate 13 is arranged corresponding to the liquid outlet end of the pressure test valve 3, one end of the pressure test pipe assembly is connected to the water tank, and the other end of the pressure test pipe assembly is connected to the liquid inlet end of the pressure test valve 3 through the No. 1 sealing plate 5.

[0028] In this embodiment, the hydraulic jack 2 has a lift of 150 mm and a lifting force of 30 t, and can be applied to all valves with a Dn of 200 mm and a Pn of less than 10 MPa.

[0029] Specific implementation method 2: Combination Figures 1 to 8 This embodiment is described. The difference between this embodiment and the specific embodiment 1 is that the pressure test pipeline assembly includes a water inlet valve 6, a pressure test water pipe 8, a standard pressure gauge group 10 and a pressure gauge 11. One end of the pressure test water pipe 8 is connected to the water storage tank, and the other end of the pressure test water pipe 8 is connected to the liquid inlet end of the pressure test valve 3 through a No. 1 sealing plate 5. The water inlet valve 6, the pressure gauge 11 and the standard pressure gauge group 10 are sequentially connected in series on the pressure test water pipe 8 along the water inlet flow direction. Other components and connection methods are the same as those of the specific embodiment 1.

[0030] Specific implementation method three: Combination Figures 1 to 8 This embodiment is described. The difference between this embodiment and the second embodiment is that a drain branch pipe is provided between the water inlet valve 6 and the pressure gauge 11 on the pressure test water pipe 8, one end of the drain branch pipe is connected to the pressure test water pipe 8, and the other end of the drain branch pipe is connected to the water storage tank, and a stop valve 7 is connected in series on the drain branch pipe. Other components and connection methods are the same as those of the second embodiment.

[0031] Specific implementation method four: Combination Figures 1 to 8 This embodiment is described. The difference between this embodiment and the specific embodiment 3 is that an exhaust branch pipe is connected in series between the standard pressure gauge group 10 and the first sealing plate 5 on the test pressure water pipe 8, one end of the exhaust branch pipe is connected to the test pressure water pipe 8, and the other end of the exhaust branch pipe is connected to the external air, and the exhaust valve 4 is connected in series on the exhaust branch pipe. Other components and connection methods are the same as those of the specific embodiment 3.

[0032] In combination with the description of specific implementations 2 to 4, the arrangement of the exhaust valve 4 and the exhaust branch pipe in the pressure test water pipe 8 can be beneficial to the exhaust treatment of the valve, ensuring the stability of the subsequent pressure test. The discharge branch pipe and the stop valve 7 can ensure accurate pressure relief in the case of high-pressure imbalance, thereby ensuring the stable operation of the pressure test device.

[0033] Specific implementation method five: Combination Figures 1 to 8 The present embodiment is described. The present embodiment is different from the fourth embodiment in that a valve flange 16 is provided on the water inlet and outlet ends of the pressure test valve 3, and the valve flange 16 is fixedly connected to the pressure test valve 3. The end surface of the valve flange 16 away from the pressure test valve 3 is processed with N sealing ring grooves, N is a positive integer, and the N sealing ring grooves are coaxially sleeved in sequence from small to large along the diameter of the ring groove. Each group of sealing gaskets 9 includes N sealing gaskets 9, and each sealing gasket 9 is correspondingly embedded in a sealing ring groove. The first sealing plate 5 One end face that matches the valve flange 16 is processed with N No. 1 matching ring grooves 15, and each No. 1 matching ring groove 15 is set correspondingly to a sealing ring groove, and the No. 1 sealing plate 5 is sealed and matched with the corresponding valve flange 16 through a set of sealing gaskets 9, and one end face that matches the valve flange 16 is processed with N No. 2 matching ring grooves 17, and each No. 2 matching ring groove 17 is set correspondingly to a sealing ring groove, and the No. 2 sealing plate 13 is sealed and matched with the corresponding valve flange 16 through another set of sealing gaskets 9. Other components and connection methods are the same as those of the fourth embodiment.

[0034] Specific implementation method six: Combination Figures 1 to 8 This embodiment is described. The difference between this embodiment and the fifth embodiment is that the cross section of the sealing gasket 9 is an ellipse or an octagon, and the cross section of the first matching ring groove 15 is the same as the cross section of the second matching ring groove 17, both of which are isosceles trapezoids. Other components and connection methods are the same as those of the fifth embodiment.

[0035] In combination with the description of specific implementation methods five and six, according to the provisions of "Ring-connecting cross-sectional dimensions" in GB20592 "PN series of steel pipe flanges" and GB20651 "CLASS series of steel pipe flanges", Dn15\Dn25, Dn40\Dn65... and the like can be designed and manufactured on a group of sealing plates; Dn20\Dn32\Dn50\Dn80... can be manufactured on another group of sealing plates, and the size of the sealing gasket 9 is set corresponding to the above-mentioned size. In actual work, the valve flange 16 can also be processed with only one sealing ring groove according to the specific model parameters, but the sealing ring groove must correspond to one group of N No. 1 matching ring grooves 15 or No. 2 matching ring grooves 17. In this way, a group of sealing plates can be used to test the pressure of valves of different models during the pressure test, thereby improving the versatility of the device. The sealing ring groove is an elliptical sealing ring or an octagonal sealing ring.

[0036] Specific implementation method seven: Combination Figures 1 to 8 This embodiment is described. The difference between this embodiment and the specific embodiment 6 is that an L-shaped through hole is processed in the No. 1 sealing plate 5, one end of the L-shaped through hole is connected with the bottom end of the No. 1 sealing plate 5, and one end of the L-shaped through hole is corresponding to the liquid inlet end of the pressure test valve 3, and the other end of the L-shaped through hole is connected with the outer circumferential surface of the No. 1 sealing plate 5, and a water pipe interface 14 is installed on the other end of the L-shaped through hole, and the other end of the L-shaped through hole is connected with the pressure test water pipe 8 through the water pipe interface 14. Other components and connection methods are the same as those of the specific embodiment 6.

[0037] Specific implementation method eight: Combination Figures 1 to 8The present embodiment is described. The present embodiment is different from the seventh embodiment in that the frame 1 includes an upper frame unit and a lower frame unit. The upper frame unit is inserted into the lower frame unit, and the upper frame unit is detachably connected to the lower frame unit. The upper frame unit includes a top plate 1-1 and a plurality of groups of plug-in columns 1-2. The plurality of groups of plug-in columns 1-2 are arranged equidistantly on the lower surface of the top plate 1-1 in the length extension direction of the top plate 1-1. Each group of plug-in columns 1-2 includes two plug-in columns 1-2. The two plug-in columns 1-2 in the same group are symmetrically arranged along the center line of the width direction of the top plate 1-1, and the top end of each plug-in column 1-2 is fixedly connected to the lower surface of the top plate 1-1. Next, the lower frame unit includes a bottom plate 1-4 and multiple groups of plug-in sleeves 1-3, which are arranged equidistantly on the upper surface of the bottom plate 1-4 along the length extension direction of the bottom plate 1-4, each group of plug-in sleeves 1-3 includes two plug-in sleeves 1-3, and the two plug-in sleeves 1-3 in the same group are symmetrically arranged along the center line of the width direction of the top plate 1-1, and the top of each plug-in sleeve 1-3 is fixedly connected to the upper surface of the bottom plate 1-4, each plug-in column 1-2 in the upper frame unit is correspondingly inserted in a plug-in sleeve 1-3 in the lower frame unit, and each plug-in column 1-2 is detachably connected to a corresponding plug-in sleeve 1-3 through an adjustable pin 12. Other components and connection methods are the same as those in the seventh embodiment.

[0038] In this embodiment, the main purpose of the frame 1 is to place the pressure test valve and the jack. By adjusting the distance between the lower frame unit and the upper frame unit, it can adapt to the testing of valve bodies of various sizes. The adjustable pin 12 is used to lock the lower frame unit and the upper frame unit to ensure stability during operation.

[0039] Specific implementation method nine: Combination Figures 1 to 8 This embodiment is described. The difference between this embodiment and the eighth embodiment is that the hydraulic jack 2 is arranged on the upper surface of the bottom plate 1-4 in the vertical direction, and the hydraulic jack 2 is fixedly connected to the bottom plate 1-4, the pressure test valve 3 is arranged between the hydraulic jack 2 and the top plate 1-1, and the valve flange 16 at the water inlet end of the pressure test valve 3 is sealed with the No. 1 sealing plate 5 located on the lower surface of the top plate 1-1 through a set of sealing gaskets 9, and the valve flange 16 at the water outlet end of the pressure test valve 3 is sealed with the No. 2 sealing plate 13 located on the top of the hydraulic jack 2 through another set of sealing gaskets 9. Other components and connection methods are the same as those of the eighth embodiment.

[0040] This embodiment is a pressure test device for testing lightweight valve bodies, and adopts a high-altitude testing method. In this testing method, the lightweight valve body is easy to move at a high altitude, and its weight is less than the weight of the hydraulic jack. Testing at a low altitude is likely to cause damage to the valve body under the action of the test pressure and the gravity of the hydraulic jack.

[0041] Specific implementation method ten: Combination Figures 1 to 8 This embodiment is described. The difference between this embodiment and the eighth embodiment is that the hydraulic jack 2 is arranged on the lower surface of the top plate 1-1 in the vertical direction, and the hydraulic jack 2 is fixedly connected to the top plate 1-1, the pressure test valve 3 is arranged between the hydraulic jack 2 and the bottom plate 1-4, and the valve flange 16 at the water inlet end of the pressure test valve 3 is sealed with the No. 1 sealing plate 5 located at the bottom of the hydraulic jack 2 through a set of sealing gaskets 9, and the valve flange 16 at the water outlet end of the pressure test valve 3 is sealed with the No. 2 sealing plate 13 located on the upper surface of the bottom plate 1-4 through another set of sealing gaskets 9. Other components and connection methods are the same as those of the eighth embodiment.

[0042] This embodiment is a pressure test device for testing heavy valve bodies, and adopts a low-level test method. In this test method, the heavy valve body is not convenient to move at a high place. Its weight is greater than the weight of the hydraulic jack, and it has a strong pressure-bearing capacity, which can meet the working requirements of the test.

[0043] The present invention has been disclosed as above with preferred implementation cases, but it is not used to limit the present invention. Any technician familiar with the profession can make some changes or modifications to equivalent implementation cases with equivalent changes by using the above-disclosed structures and technical contents without departing from the scope of the technical solution of the present invention. However, any simple modifications, equivalent changes and modifications made to the above implementation cases based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

[0044] How it works

[0045] When using this application, the arrangement method is first selected according to the quality of the valve body. Here, a lightweight valve body is used as an example. Figure 1 According to the arrangement described in the above, the pressure test valve 3 is arranged between the hydraulic jack 2 and the upper frame unit, and is sealed with the hydraulic jack 2 and the frame 1 through the No. 1 sealing plate 5, the No. 2 sealing plate 13 and two sets of sealing gaskets 9. First, the gas retained in the pressure test valve 3 is discharged through the exhaust valve 4. While ensuring the sealing of the pressure test valve 3, water is injected into the interior through the pressure test water pipe 8 to increase the pressure, and a pressure test of the pressure test valve 3 is performed. After the test, the test water in the pressure test valve 3 is discharged and the pressure test results are recorded. Finally, it is determined whether the pressure test valve 3 can be installed in the pump group based on the pressure test results.

Claims

1. A pressure test device for a metal annular connection surface valve, characterized in that: The pressure test device comprises a frame (1), a hydraulic jack (2), a No. 1 sealing plate (5), a No. 2 sealing plate (13), two groups of sealing gaskets (9) and a pressure test pipeline assembly. The hydraulic jack (2) is arranged in the frame (1), and the hydraulic jack (2) is fixedly connected to the frame (1). The pressure test valve (3) is arranged between the hydraulic jack (2) and the frame (1), and the pressure test valve (3) is sealed with the hydraulic jack (2) and the frame (1) through the No. 1 sealing plate (5), the No. 2 sealing plate (13) and the two groups of sealing gaskets (9). The No. 1 sealing plate (5) is arranged correspondingly to the liquid inlet end of the pressure test valve (3), and the No. 2 sealing plate (13) is arranged correspondingly to the liquid outlet end of the pressure test valve (3). One end of the pressure test pipeline assembly is connected to a water storage tank, and the other end of the pressure test pipeline assembly is connected to the liquid inlet end of the pressure test valve (3) through the No. 1 sealing plate (5).

2. A pressure testing device for a metal annular connection surface valve according to claim 1, characterized in that: The pressure test pipeline assembly comprises a water inlet valve (6), a pressure test water pipe (8), a standard pressure gauge group (10) and a pressure gauge (11); one end of the pressure test water pipe (8) is connected to a water storage tank, and the other end of the pressure test water pipe (8) is connected to a liquid inlet end of a pressure test valve (3) via a No. 1 sealing plate (5); the water inlet valve (6), the pressure gauge (11) and the standard pressure gauge group (10) are sequentially connected in series on the pressure test water pipe (8) along the water inlet flow direction.

3. A pressure testing device for a metal annular connection surface valve according to claim 2, characterized in that: A discharge branch pipe is provided on the pressure test water pipe (8) between the water inlet valve (6) and the pressure gauge (11), one end of the discharge branch pipe is connected to the pressure test water pipe (8), and the other end of the discharge branch pipe is connected to the water storage tank, and a stop valve (7) is connected in series on the discharge branch pipe.

4. A pressure testing device for a metal annular connection surface valve according to claim 3, characterized in that: An exhaust branch pipe is connected in series between the standard pressure gauge group (10) and the No. 1 sealing plate (5) on the pressure test water pipe (8), one end of the exhaust branch pipe is connected to the pressure test water pipe (8), and the other end of the exhaust branch pipe is connected to the external air. An exhaust valve (4) is connected in series to the exhaust branch pipe.

5. A pressure testing device for a metal annular connection surface valve according to claim 4, characterized in that: The water inlet and outlet ends of the pressure test valve (3) are each provided with a valve flange (16), and the valve flange (16) is fixedly connected to the pressure test valve (3). The end surface of the valve flange (16) away from the pressure test valve (3) is processed with N sealing ring grooves, N is a positive integer, and the N sealing ring grooves are coaxially sleeved in sequence from small to large along the diameter of the ring groove. Each group of sealing gaskets (9) includes N sealing gaskets (9), and each sealing gasket (9) is correspondingly embedded in a sealing ring groove. The end surface of the No. 1 sealing plate (5) that matches the valve flange (16) is N No. 1 matching ring grooves (15) are processed on the upper surface, and each No. 1 matching ring groove (15) is arranged corresponding to a sealing ring groove. The No. 1 sealing plate (5) is sealed and matched with the corresponding valve flange (16) through a group of sealing gaskets (9). N No. 2 matching ring grooves (17) are processed on the end surface of the No. 2 sealing plate (13) that matches with the valve flange (16), and each No. 2 matching ring groove (17) is arranged corresponding to a sealing ring groove. The No. 2 sealing plate (13) is sealed and matched with the corresponding valve flange (16) through another group of sealing gaskets (9).

6. A pressure testing device for a metal annular connection surface valve according to claim 5, characterized in that: The cross section of the sealing gasket (9) is elliptical or octagonal, and the cross section of the No. 1 matching ring groove (15) is the same as the cross section of the No. 2 matching ring groove (17), both of which are isosceles trapezoids.

7. A pressure testing device for a metal annular connection surface valve according to claim 6, characterized in that: An L-shaped through hole is machined in the No. 1 sealing plate (5), one end of the L-shaped through hole is connected to the bottom end of the No. 1 sealing plate (5), and one end of the L-shaped through hole is arranged corresponding to the liquid inlet end of the pressure test valve (3), the other end of the L-shaped through hole is connected to the outer circumferential surface of the No. 1 sealing plate (5), a water pipe interface (14) is installed on the other end of the L-shaped through hole, and the other end of the L-shaped through hole is connected to the pressure test water pipe (8) through the water pipe interface (14).

8. A pressure testing device for a metal annular connection surface valve according to claim 7, characterized in that: The frame (1) comprises an upper frame unit and a lower frame unit, wherein the upper frame unit is inserted into the lower frame unit and the upper frame unit is detachably connected to the lower frame unit, wherein the upper frame unit comprises a top plate (1-1) and a plurality of groups of plug-in columns (1-2), wherein the plurality of groups of plug-in columns (1-2) are arranged equidistantly on the lower surface of the top plate (1-1) in sequence along the length extension direction of the top plate (1-1), wherein each group of plug-in columns (1-2) comprises two plug-in columns (1-2), wherein the two plug-in columns (1-2) in the same group are symmetrically arranged along the center line of the width direction of the top plate (1-1), and the top end of each plug-in column (1-2) is fixedly connected to the lower surface of the top plate (1-1), and the lower frame unit comprises a bottom plate (1-4) and a plurality of plug-in columns (1-2). A plurality of groups of plug-in sleeves (1-3) are arranged equidistantly on the upper surface of the bottom plate (1-4) along the length extension direction of the bottom plate (1-4), each group of plug-in sleeves (1-3) comprises two plug-in sleeves (1-3), the two plug-in sleeves (1-3) in the same group are symmetrically arranged along the center line of the width direction of the top plate (1-1), and the top end of each plug-in sleeve (1-3) is fixedly connected to the upper surface of the bottom plate (1-4), each plug-in column (1-2) in the upper frame unit is correspondingly inserted into a plug-in sleeve (1-3) in the lower frame unit, and each plug-in column (1-2) is detachably connected to a corresponding plug-in sleeve (1-3) via an adjustable pin (12).

9. A pressure testing device for a metal annular connection surface valve according to claim 8, characterized in that: The hydraulic jack (2) is arranged on the upper surface of the bottom plate (1-4) in the vertical direction, and the hydraulic jack (2) is fixedly connected to the bottom plate (1-4). The pressure test valve (3) is arranged between the hydraulic jack (2) and the top plate (1-1), and the valve flange (16) at the water inlet end of the pressure test valve (3) is sealed with a No. 1 sealing plate (5) located on the lower surface of the top plate (1-1) through a group of sealing gaskets (9), and the valve flange (16) at the water outlet end of the pressure test valve (3) is sealed with a No. 2 sealing plate (13) located on the top of the hydraulic jack (2) through another group of sealing gaskets (9).

10. A pressure testing device for a metal annular connection surface valve according to claim 8, characterized in that: The hydraulic jack (2) is arranged on the lower surface of the top plate (1-1) in the vertical direction, and the hydraulic jack (2) is fixedly connected to the top plate (1-1). The pressure test valve (3) is arranged between the hydraulic jack (2) and the bottom plate (1-4), and the valve flange (16) at the water inlet end of the pressure test valve (3) is sealed with a No. 1 sealing plate (5) located at the bottom of the hydraulic jack (2) through a group of sealing gaskets (9), and the valve flange (16) at the water outlet end of the pressure test valve (3) is sealed with a No. 2 sealing plate (13) located on the upper surface of the bottom plate (1-4) through another group of sealing gaskets (9).

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