High-pressure valve pressure comprehensive test board and test method thereof

Abstract

The invention discloses a high-pressure valve pressure comprehensive test board and a test method thereof, and relates to the technical field of valve testing. The left side of the rear end of the test bench is fixedly provided with a first-stage booster pump with a diversion effect. The device integrates medium-pressure and high-pressure tests to realize integrated tests of parameters such as pressure characteristics and flow characteristics of medium-pressure and high-pressure reducing valves; the two-stage pressurization system adopting the first-stage pressurization pump and the second-stage pressurization pump meets the test requirements of medium-high pressure products, the pressurization pumps do not need to be started in the medium-pressure test, the starting and stopping frequency is reduced, and the service life of the pressurization pumps is prolonged. An electric contact pressure gauge is arranged in the circuit to automatically adjust the system pressure according to pressure parameters, the pressure is kept within a set range, and meanwhile, the electric contact pressure gauge can send out an alarm signal to remind an operator to pay attention, so that measures can be taken in time, and accidents are prevented; and the leakage risk in the high-pressure connection process is reduced by arranging the double-valve integrated block.

Description

Technical Field

[0001] The invention relates to the technical field of valve testing, in particular to a high-pressure valve pressure comprehensive testing platform and a testing method thereof. Background Art

[0002] Valves are pipeline accessories used to open and close pipelines, control flow direction, and adjust and control the parameters (temperature, pressure and flow) of the conveying medium. According to their functions, they can be divided into shut-off valves, check valves, regulating valves, etc. Valves, as important components of fluid control, are widely used in many fields such as petroleum, chemical industry, and water treatment.

[0003] Existing valve pressure testing devices mostly adopt a single pressure testing mode. For different types of valves and different testing requirements, the testing efficiency and accuracy need to be improved. Existing testing devices are difficult to adapt to valves of multiple specifications and calibers while ensuring that the test gas maintains a stable pressure when entering the valve, thus affecting the valve testing effect. Summary of the invention

[0004] Therefore, in order to solve the above-mentioned deficiencies, the present invention provides a high-pressure valve pressure comprehensive test bench and a test method thereof.

[0005] The present invention is implemented by constructing a high-pressure valve pressure comprehensive test bench and a test method thereof, the device comprising a test bench; a first-stage booster pump with a diversion function is fixedly installed on the left side of the rear end of the test bench; a high-pressure gas tank is fixedly installed on the right end of the first-stage booster pump through a pipeline;

[0006] A secondary booster pump is fixedly installed on the right side of the rear end of the test bench by bolts; a filter is fixedly installed at the air outlet of the high-pressure gas tank; a switch needle valve is fixedly installed at the air outlet of the rear end of the filter through a pipeline; the right side of the switch needle valve is fixedly connected to the air inlet of the first high-pressure reducing valve through a pipeline; the air outlet of the first high-pressure reducing valve is fixedly installed with the air inlet of the double-valve integrated block through a connecting pipe; the detection interface on the bottom side of the double-valve integrated block is fixedly connected to the second high-pressure reducing valve through a connecting pipe; the second high-pressure reducing valve is fixedly connected to the right side of the connecting block assembly through a connecting pipe; an air pressure valve with a derivation function is fixedly installed on the left side of the connecting block assembly through a connecting pipe; the air outlet of the air pressure valve is fixedly connected to the top of the reflux tank through a connecting pipe; a double-valve integrated block is fixedly provided at the right side of the air outlet of the secondary booster pump, and the connecting pipe at the detection joint of the double-valve integrated block is plugged and fixed inside the air outlet pool.

[0007] Preferably, the double-valve integrated block is specifically composed of an integrated block with an airway, a stop valve fixedly installed on the left side of the top of the integrated block, and a pressure valve fixedly installed on the right side of the top of the integrated block; a pressure relief outlet with a pressure relief function is provided at the bottom valve core of the pressure valve on the double-valve integrated block.

[0008] Preferably, the connecting block assembly includes a slide plate slidably arranged on the top of the test bench; a negative pressure cylinder with an adjusting function is plugged and fixedly installed on the top of the slide plate; a pipe expansion assembly is fixedly installed on the top of the slide plate by bolts; a pressure valve is fixedly installed on the side of the pipe expansion assembly; and an arrangement air valve is fixedly installed on the rear end of the pipe expansion assembly by bolts.

[0009] Preferably, the tube expansion assembly comprises a sealing shell fixedly mounted on the top of the slide plate by bolts; a detachable pipe opening is fixedly mounted on both sides of the sealing shell by bolts; a cavity is arranged inside the sealing shell, and an airbag is arranged inside the cavity.

[0010] Preferably, cylinders are plugged and fixedly installed on the left and right sides of the inner wall of the sealed shell; a moving block is plugged and fixedly installed at the end of the cylinder piston rod; an elastic net is plugged and fixedly installed between the two groups of moving blocks on the left and right sides of the sealed shell; and a supporting wire is clamped inside the elastic net.

[0011] Preferably, electric contact pressure gauges are installed at the relevant connecting pipes on the sides of the first high-pressure pressure reducing valve and the second high-pressure pressure reducing valve to measure the pressures of various gases and liquid media.

[0012] A testing method for a high-pressure valve pressure comprehensive test bench comprises the following steps:

[0013] Step 1, air pressure pre-preparation; the staff passes the external air source into the first-stage booster pump and the second-stage booster pump through the pipeline as the driving source, and then connects the bottle tank containing nitrogen to the first-stage booster pump through the connecting pipe, and then drives the first-stage booster pump to work. The first-stage booster pump pressurizes the conventional low-pressure nitrogen to 25-40Mpa and stores it in the high-pressure gas tank; then the staff controls the external air source through the control terminal according to the measured caliber data to input it into the cylinder through the arrangement valve. At this time, the cylinder pushes the moving block at the end of its piston rod to move inside the sealed shell. The displacement of the moving block pulls the elastic net and support wire on its side to deform, so that the elastic net and support wire inside the sealed shell form a trumpet-shaped flow channel, and then the airbag is provided with air source through the external air source, so that it expands and squeezes the elastic net and support wire, and the test pre-preparation is completed;

[0014] Step 2: Install the valve to be tested; the staff measures and checks the caliber and pressure parameters of the valve to be tested, and then selects a suitable pressure valve based on the measured caliber data. The valve to be tested and the pressure valve are clamped by external equipment and placed between the two sets of expansion tube components on the top of the test bench. The negative pressure cylinder is then driven by the control terminal to perform a clamping action, so that the two sets of expansion tube components on its side are pulled closer to each other and clamp the valve to be tested. In this interval, the staff needs to adjust the spatial position of the valve to be tested in real time through external equipment to align the flow channel openings of the expansion tube component and the pressure valve.

[0015] Step 3, medium pressure test; here, the high-pressure gas is released by controlling the high-pressure gas tank to enter the main pipeline after being filtered by the filter. Here, the switch needle valve on the side of the main pipeline and the first high-pressure reducing valve are opened to allow the high-pressure gas to enter the filter on one side of the test bench for medium pressure testing. At this time, by adjusting the position of the valve core or diaphragm inside the first high-pressure reducing valve, the flow and pressure of the fluid can be controlled to keep the output pressure within the set range and then enter the filter for gas treatment again. Then, the reduced-pressure gas is introduced into the double-valve integrated block through the connecting pipe at the filter outlet, and then controlled by the stop valve in the double-valve integrated block. After the flow rate of the controlled gas is controlled, the gas flows through the second high-pressure reducing valve and enters the elastic net and the supporting wire. Due to the adjustment action of the elastic net and the supporting wire, the left and right flow channel openings of the sealing shell are respectively formed into trumpet-shaped structures with the same valve opening as the second high-pressure reducing valve and the same diameter as the valve opening of the pressure valve. Here, the valve core control degree of the second high-pressure reducing valve needs to be calculated and controlled according to the trumpet-shaped flow channel data to ensure that the gas will not cause a large degree of pressure fluctuation due to the change of the flow channel diameter after flowing into the elastic net and the supporting wire. Then, the gas is introduced into the valve to be tested for medium pressure test after the pressure test of the pressure valve.

[0016] Step 4, high-pressure test: by controlling the switch needle valve on the test bench on the side used for high-pressure test, the medium-pressure gas enters the secondary booster pump for secondary boosting and forms high-pressure gas, and the high-pressure gas is directly introduced into the valve to be tested through the double-valve manifold and the connecting block assembly to perform high-pressure test action;

[0017] Step 5: Comprehensive test: Repeat steps 1 and 2, and then execute steps 3 and 4 simultaneously. Here, you need to start the first-level booster pump to replenish the gas source for the high-pressure gas tank to ensure that the medium-pressure gas can meet the comprehensive test requirements.

[0018] The present invention has the following advantages: The present invention provides a high-pressure valve pressure comprehensive test bench and a test method thereof through improvement, which has the following improvements compared with the same type of equipment:

[0019] The present invention discloses a high-pressure valve pressure comprehensive test bench and a test method thereof. The device integrates medium-pressure and high-pressure tests to realize integrated testing of parameters such as pressure characteristics and flow characteristics of medium-pressure and high-pressure pressure reducing valves. A two-stage boosting system of a primary boosting pump and a secondary boosting pump is adopted to meet the testing requirements of medium- and high-pressure products, and the boosting pump does not need to be started during medium-pressure testing, thereby reducing the number of starts and stops and extending the service life of the boosting pump. A pipe expansion assembly is provided to adapt to valves of different specifications while avoiding large pressure fluctuations of the gas due to the flow channel. An electric contact pressure gauge is provided in the line to automatically adjust the system pressure according to the pressure parameters to keep the pressure within the set range. At the same time, the electric contact pressure gauge will also send an alarm signal to remind the operator to take timely measures to prevent accidents. A double-valve integrated block is provided to reduce the risk of leakage during the high-pressure connection process. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the structure of the present invention;

[0021] Figure 2 It is a schematic diagram of the exploded structure of the connection block assembly of the present invention;

[0022] Figure 3 is a schematic cross-sectional structural diagram of the pipe expansion assembly of the present invention;

[0023] Figure 4 It is a schematic diagram of the system structure of the present invention;

[0024] Figure 5 It is a schematic diagram of the process of the present invention.

[0025] Among them: test bench-1, first-stage booster pump-2, high-pressure gas tank-3, second-stage booster pump-4, filter-5, switch needle valve-6, first high-pressure pressure reducing valve-7, double-valve integrated block-8, second high-pressure pressure reducing valve-9, connecting block assembly-10, air pressure valve-11, reflux tank-12, air outlet pool-13, slide plate-101, negative pressure cylinder-102, expansion pipe assembly-103, pressure valve-104, arrangement air valve-105, sealing shell-1031, detachable pipe mouth-1032, air bag-1033, cylinder-1034, moving block-1035, elastic net-1036, support wire-1037. DETAILED DESCRIPTION

[0026] The following is combined with Figure 1 to Figure 5 The principles and features of the present invention are described, and the examples given are only used to explain the present invention and are not used to limit the scope of the present invention. In the following paragraphs, the present invention is described in more detail by way of example with reference to the accompanying drawings. It should be noted that the drawings are all in a very simplified form and are not in precise proportions, and are only used to facilitate and clearly assist in explaining the purpose of the embodiments of the present invention.

[0027] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0028] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "set" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. The following is an explanation of the embodiments of the present invention based on its overall structure.

[0029] Embodiment 1:

[0030] See also Figure 1 to Figure 5 A high-pressure valve pressure comprehensive test bench and a test method thereof of the present invention include a test bench 1; a first-stage booster pump 2 with a diversion function is fixedly installed on the left side of the rear end of the test bench 1; a high-pressure gas tank 3 is fixedly installed on the right end of the first-stage booster pump 2 through a pipeline.

[0031] A secondary booster pump 4 is fixedly installed on the right side of the rear end of the test bench 1 by bolts; a filter 5 is fixedly installed at the air outlet of the high-pressure gas tank 3; a switch needle valve 6 is fixedly installed at the air outlet of the rear end of the filter 5 through a pipeline; the right side of the switch needle valve 6 is fixedly connected to the air inlet of the first high-pressure reducing valve 7 through a pipeline; the air outlet of the first high-pressure reducing valve 7 is fixedly installed with the air inlet of the double-valve integrated block 8 through a connecting pipe; the detection interface on the bottom side of the double-valve integrated block 8 is fixedly connected to the second high-pressure reducing valve 9 through a connecting pipe; the second high-pressure reducing valve 9 is fixedly connected to the right side of the connecting block assembly 10 through a connecting pipe; an air pressure valve 11 with a derivation function is fixedly installed on the left side of the connecting block assembly 10 through a connecting pipe; the air outlet of the air pressure valve 11 is fixedly connected to the top of the reflux tank 12 through a connecting pipe; a double-valve integrated block 8 is fixedly provided at the right side of the air outlet of the secondary booster pump 4, and the connecting pipe at the detection joint of the double-valve integrated block 8 is plugged and fixed inside the air outlet pool 13.

[0032] Electric contact pressure gauges are installed on the side of the first high-pressure reducing valve 7 and the second high-pressure reducing valve 9 at the relevant connecting pipes for measuring the various gas and liquid media to be measured; the double-valve integrated block 8 is specifically composed of an integrated block with an airway, a stop valve fixedly installed on the left side of the top of the integrated block, and a pressure valve fixedly installed on the right side of the top of the integrated block; a pressure relief outlet with a pressure relief function is provided at the bottom valve core of the pressure valve on the double-valve integrated block 8.

[0033] The connecting block assembly 10 includes a slide plate 101 slidably arranged on the top of the test bench 1; a negative pressure cylinder 102 with an adjusting function is plugged and fixedly installed on the top of the slide plate 101; a pipe expansion assembly 103 is fixedly installed on the top of the slide plate 101 by bolts; a pressure valve 104 is fixedly installed on the side of the pipe expansion assembly 103; and an arrangement air valve 105 is fixedly installed on the rear end of the pipe expansion assembly 103 by bolts.

[0034] Embodiment 2:

[0035] See also Figure 1 to Figure 5 , a high-pressure valve pressure comprehensive test bench and its test method of the present invention, compared with the first embodiment, this embodiment also includes: the expansion tube assembly 103 includes a sealing shell 1031 fixedly installed on the top of the slide plate 101 by bolts; the left and right sides of the sealing shell 1031 are fixedly installed with a detachable pipe mouth 1032 by bolts; a cavity is arranged inside the sealing shell 1031, and an air bag 1033 is arranged inside the cavity; the left and right sides of the inner wall of the sealing shell 1031 are plugged and fixedly installed with a cylinder 1034; the end of the piston rod of the cylinder 1034 is plugged and fixedly installed with a moving block 1035; an elastic net 1036 is plugged and fixedly arranged between the two groups of moving blocks 1035 on the left and right sides of the sealing shell 1031; a supporting wire 1037 is clamped inside the elastic net 1036.

[0036] The working principle of the above-mentioned high-pressure valve pressure comprehensive test bench and its test method is as follows:

[0037] First, when using this device, first place the device in the working area, and then connect the device to an external power source to provide the device with the power required for operation;

[0038] Second, the staff passes the external gas source into the first-stage booster pump 2 and the second-stage booster pump 4 through the pipeline as a driving source, and then connects the bottle tank containing nitrogen to the first-stage booster pump 2 through a connecting pipe, and then drives the first-stage booster pump 2 to work. The first-stage booster pump 2 pressurizes the conventional low-pressure nitrogen to 25-40Mpa and stores it in the high-pressure gas tank 3; then the staff controls the external gas source through the control terminal according to the measured caliber data and inputs it into the cylinder 1034 through the arrangement valve 105. When the cylinder 1034 pushes the moving block 1035 at the end of its piston rod to move inside the sealed housing 1031, the moving block 1035 moves and pulls the elastic net 1036 and the supporting wire 1037 on its side to deform, so that the elastic net 1036 and the supporting wire 1037 inside the sealed housing 1031 form a trumpet-shaped flow channel, and then the air bag 1033 is provided with air source through an external air source, so that it expands and squeezes the elastic net 1036 and the supporting wire 1037, and the test preparation is completed;

[0039] Third, the staff measures and checks the caliber and pressure parameters of the valve to be tested, and then selects a suitable pressure valve 104 based on the measured caliber data, and then clamps the valve to be tested and the pressure valve 104 through external equipment, and places them between the two groups of expansion tube components 103 on the top of the test bench 1, and then drives the negative pressure cylinder 102 through the control terminal to perform a clamping action, so that it pulls the two groups of expansion tube components 103 on its side to approach each other and clamp the valve to be tested. In this interval, the staff needs to adjust the spatial position of the valve to be tested in real time through external equipment to align the flow channel openings of the expansion tube component 103 and the pressure valve 104; here, the high-pressure gas tank 3 is controlled to release the high-pressure gas, which is filtered through the filter 5 and then enters the main pipeline. Here, the switch needle valve 6 and the first high-pressure reducing valve 7 on the side of the main pipeline are opened to allow the high-pressure gas to enter the filter 5 on one side of the test bench 1 for medium-pressure testing. At this time, the position of the valve core or diaphragm inside the first high-pressure reducing valve 7 is adjusted. To control the flow rate and pressure of the fluid, so that the output pressure is maintained within the set range, the fluid enters the filter 5 for gas treatment again, and then the reduced-pressure gas is introduced into the double-valve integrated block 8 through the connecting pipe of the air outlet of the filter 5. After the flow rate of the gas is controlled by the stop valve in the double-valve integrated block 8, the gas flows through the second high-pressure reducing valve 9 and enters the elastic net 1036 and the support wire 1037. Due to the adjustment action of the elastic net 1036 and the support wire 1037 set here, the left and right flow channel openings of the sealing shell 1031 respectively form a trumpet-shaped structure with the same valve opening of the second high-pressure reducing valve 9 and the same valve opening diameter as the pressure valve 104. Here, the valve core control degree of the second high-pressure reducing valve 9 needs to be calculated and controlled according to the trumpet-shaped flow channel data to ensure that the gas will not cause a large degree of pressure fluctuation due to the change of the flow channel diameter after flowing into the elastic net 1036 and the support wire 1037. Then, the gas is introduced into the valve to be tested for medium pressure testing after the pressure test of the pressure valve 104;

[0040] Fourth, by controlling the switch needle valve 6 on the test bench 1 on the high-pressure detection side, the medium-pressure gas enters the secondary booster pump 4 for secondary boosting and forms high-pressure gas. The high-pressure gas is directly introduced into the valve to be tested through the double-valve integrated block 8 and the connecting block assembly 10 to perform high-pressure detection. Since the medium-pressure and high-pressure test processes set in this device are independent pipelines, this device can realize the integrated test of related parameters such as pressure characteristics, flow characteristics, leakage, and inlet pressure attenuation characteristics of medium-pressure and high-pressure reducing valves. Here, it is necessary to start the primary booster pump 2 to supplement the gas source for the high-pressure gas tank 3 to ensure that the medium-pressure gas can meet the comprehensive test requirements.

[0041] The present invention provides a high-pressure valve pressure comprehensive test bench and a test method thereof through improvement. The device integrates medium-pressure and high-pressure tests to realize integrated testing of parameters such as pressure characteristics and flow characteristics of medium-pressure and high-pressure pressure reducing valves; a two-stage boosting system of a primary boosting pump 2 and a secondary boosting pump 4 is adopted to meet the testing requirements of medium- and high-pressure products, and it is also possible to achieve that the boosting pump does not need to be started during the medium-pressure test, thereby reducing the number of starts and stops and extending the service life of the boosting pump; by setting a pipe expansion component 103, while adapting to valves of different specifications, a large degree of pressure fluctuation of the gas due to the flow channel is avoided; an electric contact pressure gauge is set in the line to automatically adjust the system pressure according to the pressure parameters to keep the pressure within the set range, and at the same time, the electric contact pressure gauge will also send an alarm signal to remind the operator to pay attention so that timely measures can be taken to prevent accidents; a double-valve integrated block 8 is set to reduce the risk of leakage during the high-pressure connection process.

[0042] The above shows and describes the basic principles, main features and advantages of the present invention, and the standard parts used in the present invention can be purchased from the market, and special-shaped parts can be customized according to the description in the specification and the drawings. The specific connection methods of each part adopt the conventional means such as mature bolts, rivets, welding, etc. in the prior art. The machinery, parts and equipment all adopt the conventional models in the prior art, and the circuit connection adopts the conventional connection method in the prior art, which will not be described in detail here.

[0043] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A high-pressure valve pressure comprehensive test bench, comprising a test bench (1); a first-stage booster pump (2) with a flow diversion function is fixedly installed on the left side of the rear end of the test bench (1); a high-pressure gas tank (3) is fixedly installed on the right end of the first-stage booster pump (2) through a pipeline; Features: A secondary booster pump (4) is fixedly installed on the right side of the rear end of the test bench (1) by means of bolts; a filter (5) is fixedly installed at the air outlet of the high-pressure gas tank (3); a switch needle valve (6) is fixedly installed at the air outlet of the rear end of the filter (5) through a pipeline; the right side of the switch needle valve (6) is fixedly connected to the air inlet of the first high-pressure pressure reducing valve (7) through a pipeline; the air outlet of the first high-pressure pressure reducing valve (7) is fixedly installed with the air inlet of the double valve integrated block (8) through a connecting pipe; the detection interface on the bottom side of the double valve integrated block (8) is connected to the detection interface through a connecting pipe. The second high-pressure reducing valve (9) is fixedly connected; the second high-pressure reducing valve (9) is fixedly connected to the right side of the connecting block assembly (10) through a connecting pipe; a pressure valve (11) with a discharge function is fixedly installed on the left side of the connecting block assembly (10) through a connecting pipe; the air outlet of the pressure valve (11) is fixedly connected to the top of the reflux tank (12) through a connecting pipe; a double-valve integrated block (8) is fixedly arranged at the right side of the air outlet of the secondary booster pump (4), and the connecting pipe at the detection joint of the double-valve integrated block (8) is plugged and fixed inside the air outlet pool (13).

2. According to claim 1, a high-pressure valve pressure comprehensive test bench is characterized by: The double-valve integrated block (8) specifically comprises an integrated block with an air passage, a stop valve fixedly mounted on the left side of the top of the integrated block, and a pressure valve fixedly mounted on the right side of the top of the integrated block; a pressure relief outlet with a pressure relief function is arranged at the valve core at the bottom of the pressure valve on the double-valve integrated block (8).

3. According to claim 2, a high-pressure valve pressure comprehensive test bench is characterized in that: The connecting block assembly (10) comprises a slide plate (101) slidably arranged on the top of the test bench (1); a negative pressure cylinder (102) with an adjusting function is plugged and fixedly installed on the top of the slide plate (101); a pipe expansion assembly (103) is fixedly installed on the top of the slide plate (101) by means of bolts; a pressure valve (104) is fixedly installed on the side of the pipe expansion assembly (103); and an arrangement air valve (105) is fixedly installed on the rear end of the pipe expansion assembly (103) by means of bolts.

4. According to claim 3, a high-pressure valve pressure comprehensive test bench is characterized in that: The pipe expansion assembly (103) comprises a sealing shell (1031) fixedly mounted on the top of the slide plate (101) by means of bolts; a detachable pipe opening (1032) is fixedly mounted on both left and right sides of the sealing shell (1031) by means of bolts; a cavity is arranged inside the sealing shell (1031), and an air bag (1033) is arranged inside the cavity.

5. According to claim 4, a high-pressure valve pressure comprehensive test bench is characterized in that: The left and right sides of the inner wall of the sealing shell (1031) are both plugged and fixedly installed with a cylinder (1034); the end of the piston rod of the cylinder (1034) is plugged and fixedly installed with a moving block (1035); an elastic net (1036) is plugged and fixedly installed between the two groups of moving blocks (1035) on the left and right sides of the sealing shell (1031); and a supporting wire (1037) is clamped inside the elastic net (1036).

6. According to claim 5, a high-pressure valve pressure comprehensive test bench is characterized in that: Electric contact pressure gauges are installed at the connecting pipes on the side of the first high-pressure pressure reducing valve (7) and the second high-pressure pressure reducing valve (9) to measure the pressures of various gases and liquid media.

7. A testing method for a high-pressure valve pressure comprehensive test bench, used to implement a high-pressure valve pressure comprehensive test bench as claimed in claim 6, characterized in that: The following steps are involved: Step 1: Air pressure preparation; The staff introduces an external gas source into the first-stage booster pump (2) and the second-stage booster pump (4) through a pipeline as a driving source, and then connects the bottle tank containing nitrogen to the first-stage booster pump (2) through a connecting pipe, thereby driving the first-stage booster pump (2) to work. The first-stage booster pump (2) pressurizes the conventional low-pressure nitrogen to 25-40Mpa and stores it in the high-pressure gas tank (3); then the staff controls the external gas source through the control terminal according to the measured caliber data to be input into the cylinder (1034) through the arrangement valve (105). At this time, the cylinder (1 034) pushes the moving block (1035) at the end of its piston rod to move inside the sealing shell (1031), and the moving block (1035) moves and pulls the elastic net (1036) and the supporting wire (1037) on its side to deform, so that the elastic net (1036) and the supporting wire (1037) inside the sealing shell (1031) form a trumpet-shaped flow channel, and then the air bag (1033) is provided with air source through an external air source, so that it expands and squeezes the elastic net (1036) and the supporting wire (1037), and the test preparation is completed; Step 2, installing the valve to be tested; the staff measures and checks the caliber and pressure parameters of the valve to be tested, and then selects a suitable pressure valve (104) based on the measured caliber data, and then clamps the valve to be tested and the pressure valve (104) through external equipment, and places them between the two sets of expansion tube components (103) on the top of the test bench (1), and then drives the negative pressure cylinder (102) through the control terminal to perform a clamping action, so that it pulls the two sets of expansion tube components (103) on its side to approach each other and clamp the valve to be tested. In this interval, the staff needs to adjust the spatial position of the valve to be tested in real time through the external equipment to align the flow channel openings of the expansion tube component (103) and the pressure valve (104); Step 3, medium pressure test; here, the high pressure gas is released by controlling the high pressure gas tank (3) to enter the main pipeline after being filtered by the filter (5). Here, the switch needle valve (6) and the first high pressure reducing valve (7) on the side of the main pipeline are opened to allow the high pressure gas to enter the filter (5) on one side of the test bench (1) for medium pressure testing. At this time, by adjusting the position of the valve core or diaphragm inside the first high pressure reducing valve (7), the flow rate and pressure of the fluid can be controlled so that the output pressure is maintained within the set range and then enters the filter (5) for gas treatment again. Then, the reduced pressure gas is introduced into the double valve integrated block (8) through the connecting pipe of the filter (5) outlet. After the gas flow rate is controlled by the stop valve in the double valve integrated block (8), the gas flows through the second high pressure reducing valve (7). The pressure reducing valve (9) enters the elastic net (1036) and the support wire (1037). Due to the adjustment action of the elastic net (1036) and the support wire (1037), the left and right flow channel openings of the sealing shell (1031) respectively form trumpet-shaped structures with the same valve opening as the second high-pressure pressure reducing valve (9) and the same diameter as the valve opening of the pressure valve (104). Here, the valve core control degree of the second high-pressure pressure reducing valve (9) needs to be calculated and controlled according to the trumpet-shaped flow channel data to ensure that the gas will not cause a large degree of pressure fluctuation due to the change of the flow channel diameter after flowing into the elastic net (1036) and the support wire (1037). Then, the gas is introduced into the valve to be tested for medium pressure testing after the pressure test of the pressure valve (104); Step 4, high-pressure test: by controlling the switch needle valve (6) on the test bench (1) on the side for high-pressure test, the medium-pressure gas enters the secondary booster pump (4) for secondary boosting and forms high-pressure gas, and the high-pressure gas is directly introduced into the valve to be tested through the double-valve integrated block (8) and the connecting block assembly (10) to perform a high-pressure test action; Step 5, comprehensive test; repeat steps 1 and 2, and then execute steps 3 and 4 simultaneously. Here, the first-level booster pump (2) needs to be started to replenish the gas source for the high-pressure gas tank (3) to ensure that the medium-pressure gas can meet the comprehensive test requirements.

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