A voltage regulator testing system and testing method

Abstract

This invention relates to the field of testing system technology, and more particularly to a pressure regulator testing system and method. The system includes a main gas path, on which an inlet pressure regulator, an inlet shut-off valve, a pressure regulator under test, an outlet shut-off valve, and a flow regulating valve are sequentially connected. An inlet pressure gauge and an outlet pressure gauge are respectively installed at the inlet and outlet ends of the pressure regulator under test to detect the pressure values ​​at the inlet and outlet ends of the regulator under test. A first branch is connected to the inlet of the main gas path via the inlet pressure regulator; a second branch is connected to the inlet of the main gas path via the inlet shut-off valve; and a third branch is connected to the outlet shut-off valve. A seventh solenoid valve is installed on the third branch, connected in series with a third pilot valve and in parallel with the third solenoid valve. The flow regulating valve adjusts the flow rate at the outlet end of the main gas path. This invention results in a simple system structure, low investment cost, high integration, and significantly reduced human intervention in the testing process, thus freeing up labor.

Description

Technical Field

[0001] This invention relates to the field of testing system technology, and in particular to a voltage regulator testing system and testing method. Background Technology

[0002] Gas pressure regulators are an important component of natural gas pressure control systems, so all products must undergo rigorous testing before leaving the factory to meet national standards.

[0003] Existing testing equipment has a low degree of automation and integration. Many processes still require group testing, which cannot be completed on a single testing system, resulting in a waste of manpower, resources, and time, and low efficiency.

[0004] The information disclosed in this background section is intended only to enhance the understanding of the general background of this disclosure and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Summary of the Invention

[0005] This invention provides a voltage regulator testing system that can effectively solve the problems in the background art.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0007] A pressure regulator testing system includes a main air circuit, wherein an inlet pressure regulator, an inlet shut-off valve, a pressure regulator under test, an outlet shut-off valve, and a flow regulating valve are sequentially connected to the main air circuit.

[0008] The pressure regulator under test is equipped with an inlet pressure gauge and an outlet pressure gauge at its inlet and outlet ends, respectively, to detect the pressure values ​​at the inlet and outlet ends of the pressure regulator under test.

[0009] The inlet pressure regulator is connected to the inlet of the main gas path via a first branch. The first branch is equipped with a first solenoid valve and a first pilot valve. The first solenoid valve controls the inlet pressure of the first pilot valve.

[0010] The inlet shut-off valve is connected to the inlet of the main gas circuit via a second branch. A third solenoid valve and a third pilot valve are installed on the second branch. The third solenoid valve is the switch for the inlet shut-off valve.

[0011] The outlet shut-off valve is connected to a third branch, and a seventh solenoid valve is installed on the third branch. The seventh solenoid valve is connected in series with the third pilot device and in parallel with the third solenoid valve.

[0012] The flow regulating valve adjusts the flow rate at the outlet of the main gas path.

[0013] Furthermore, a fourth branch is connected between the outlet of the pressure regulator under test and the inlet of the main gas path. A second solenoid valve and a second pilot valve are installed on the fourth branch. The second solenoid valve controls the inlet pressure of the second pilot valve. A perforated plate is installed on the fourth branch at the outlet of the pressure regulator under test. A fourth solenoid valve is installed on the perforated plate. The fourth solenoid valve controls the downstream pressure of the second pilot valve. A flow meter is connected between the pressure regulator under test and the outlet shut-off valve.

[0014] Furthermore, the pressure regulator under test includes: a pressure regulating diaphragm cavity bearing assembly and a pressure cutting diaphragm cavity bearing assembly; the pressure regulating diaphragm cavity bearing assembly is connected to the fourth branch through the perforated plate, and a fifth solenoid valve is provided on the perforated plate; the pressure cutting diaphragm cavity bearing assembly is connected to the fourth branch gas path through the perforated plate, and a sixth solenoid valve is provided on the perforated plate.

[0015] Furthermore, a protective cover is provided on the outside of the voltage regulator under test.

[0016] Furthermore, an inlet butterfly valve is provided between the inlet shut-off valve and the inlet pressure gauge on the main gas line, and an outlet butterfly valve is provided between the outlet shut-off valve and the outlet pressure gauge.

[0017] A pressure regulator testing method for the aforementioned pressure regulator testing system includes: pressure-bearing component strength testing, external seal testing, static characteristic factory testing, shut-off valve seat sealing performance testing, and shut-off pressure accuracy testing.

[0018] Furthermore, the strength test of the pressure-bearing component includes: shell strength test, pressure regulating diaphragm cavity pressure-bearing component strength test, and cut diaphragm cavity pressure-bearing component strength test;

[0019] The shell strength test includes the following steps:

[0020] Close the fourth, fifth, and sixth solenoid valves, open the inlet shut-off valve to keep it in a flowing state, close the outlet shut-off valve to keep it in a blocked state, and control the inlet pressure regulator through the first controller to pressurize the inlet of the pressure regulator under test in the open state, and maintain the pressure for at least 3 minutes to detect the leakage status of the pressure regulator under test;

[0021] The strength test of the pressure-bearing component of the pressure-regulating diaphragm cavity includes the following steps:

[0022] Open the fifth and second solenoid valves, and pressurize the outlet pipe section of the pressure regulator under test through the second controller. The pressure holding time is at least 3 minutes, and the leakage status of the pressure-bearing component of the pressure regulating diaphragm cavity is detected.

[0023] The strength test of the cut-off membrane cavity pressure-bearing component includes the following steps:

[0024] Open the sixth and second solenoid valves, and pressurize the outlet pipe section of the pressure regulator under test through the second controller. The pressure is maintained for at least 3 minutes, and the leakage status of the pressure-bearing component of the pressure regulating diaphragm cavity is detected.

[0025] Furthermore, the shell strength test is performed separately, while the strength test of the pressure regulating diaphragm cavity pressure-bearing component and the strength test of the cut diaphragm cavity pressure-bearing component are performed simultaneously.

[0026] Furthermore, the external sealing test and the pressure-bearing component strength test are completed simultaneously, including the following steps: spraying leak detection liquid onto the outer surface of the pressure regulator to be tested, and checking for air bubbles on the outer surface of the pressure regulator to be tested during the pressure-bearing component strength test.

[0027] Furthermore, the static characteristic factory test includes the following steps:

[0028] Open the third solenoid valve to keep the inlet shut-off valve in a flowing state, output a constant inlet pressure to the pressure regulator under test through the inlet pressure regulator, and record the flow rate and pressure downstream of the pressure regulator under test by controlling the opening of the flow regulating valve.

[0029] Furthermore, the shut-off valve seat sealing test includes the following steps:

[0030] Keep the pressure regulator under test in the off state, close the second, fourth, fifth, sixth and seventh solenoid valves, pressurize the inlet of the pressure regulator under test through the first controller and the inlet pressure regulator, immerse the outlet of the pressure regulator under test in water and check the number of bubbles.

[0031] Furthermore, the cutting pressure accuracy test includes the following steps:

[0032] Open the second and fourth solenoid valves, and continuously increase the pressure at the outlet of the pressure regulator under test through the second controller until the pressure regulator under test is cut off.

[0033] The technical solution of this invention can achieve the following technical effects:

[0034] The system has a simple structure, low investment cost, and high integration. It automatically collects key data of the voltage regulator under test and judges whether it is qualified according to standard data. It can promptly detect abnormalities of the voltage regulator under test during the test, reminding operators to make timely adjustments or repairs, ensuring that qualified products reach customers. The entire testing process significantly reduces human intervention, freeing up labor and ensuring the objectivity and impartiality of test data. The automatic archiving of test data also ensures convenient and quick traceability. Attached Figure Description

[0035] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0036] Figure 1 This is a schematic diagram of the composition and structure of a voltage regulator testing system;

[0037] Figure 2 This is a partial enlarged view of the main air path of the pressure regulator test system;

[0038] Figure 3 A schematic diagram of the branch structure of the voltage regulator testing system;

[0039] Reference numerals: 1. Inlet air source; 10. Protective cover; 21. First solenoid valve; 22. Second solenoid valve; 23. Third solenoid valve; 24. Fourth solenoid valve; 25. Fifth solenoid valve; 26. Sixth solenoid valve; 31. First pilot valve; 32. Second pilot valve; 33. Third pilot valve; 41. Inlet butterfly valve; 42. Outlet butterfly valve; 51. Inlet pressure gauge; 52. Outlet pressure gauge; 6. Pressure regulator to be tested; 61. Proximity switch; 7. Flow meter; 81. Inlet shut-off valve; 82. Outlet shut-off valve; 91. Inlet pressure regulator; 92. Flow regulating valve; a. First branch; b. Second branch; c. Third branch; d. Fourth branch. Detailed Implementation

[0040] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0041] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0042] like Figures 1-3As shown, a pressure regulator testing system includes a main air circuit. An inlet pressure regulator 91, an inlet shut-off valve 81, a pressure regulator under test 6, an outlet shut-off valve 82, and a flow regulating valve 92 are sequentially connected to the main air circuit. An inlet pressure gauge 51 and an outlet pressure gauge 52 are respectively installed at the inlet and outlet ends of the pressure regulator under test 6 to detect the pressure values ​​at the inlet and outlet ends of the pressure regulator under test 6. A first branch a is connected to the inlet of the main air circuit via the inlet pressure regulator 91. A first solenoid valve 21 and a first pilot valve 31 are installed on the first branch a. Solenoid valve 21 controls the inlet pressure of the first pilot valve 31; the inlet shut-off valve 81 is connected to the inlet of the main gas path via a second branch b, on which a third solenoid valve 23 and a third pilot valve 33 are installed, with the third solenoid valve 23 acting as the switch for the inlet shut-off valve 81; the outlet shut-off valve 82 is connected to a third branch c, on which a seventh solenoid valve is installed, connected in series with the third pilot valve 33 and in parallel with the third solenoid valve 23; the flow regulating valve 92 regulates the flow rate at the outlet of the main gas path. The main gas path, based on the pressure regulator 6 under test, is divided into upstream and downstream sections, with the upstream section supplied by the inlet gas source 1.

[0043] The technical solution of this invention features a simple system structure, low investment cost, and high integration. It automatically collects key data from the voltage regulator under test and judges its compliance according to standard data. It can promptly detect abnormalities in the voltage regulator under test during the testing process, reminding operators to make timely adjustments or repairs, ensuring that qualified products reach customers. The entire testing process significantly reduces human intervention, freeing up labor and ensuring the objectivity and impartiality of test data. The automatic archiving of test data also ensures convenient and quick traceability.

[0044] During use, both the first controller 31 and the third controller 33 can be remotely controlled. All solenoid valves and flow regulating valves 92 are connected to the control center computer via data cables. The control center computer then issues commands to the relevant components and feeds back the collected data and signals to the control center computer, automatically determining whether the measured parameters meet the national standard requirements. The final test results are then uploaded to the company's production system for archiving and easy access. At the same time, the various performance characteristics of the pressure regulator 6 under test are evaluated, which helps to enhance its properties and avoid problems during reproduction.

[0045] To facilitate adjustment of the downstream pressure value, i.e., the pressure at the outlet of the pressure regulator 6 under test, such as... Figure 1 and 3As shown, a fourth branch d is connected between the outlet of the pressure regulator under test and the inlet of the main gas path. A second solenoid valve 22 and a second pilot valve 32 are installed on the fourth branch d. The second solenoid valve 22 controls the inlet pressure of the second pilot valve 32. A perforated plate is installed on the fourth branch d at the outlet of the pressure regulator under test 6. A fourth solenoid valve 24 is installed on the perforated plate. The fourth solenoid valve 24 controls the downstream pressure of the second pilot valve 32. A flow meter 7 is connected between the pressure regulator under test 6 and the outlet shut-off valve 82. The flow meter 7 records the flow rate changes during static characteristic testing and the usage records of the flow regulating valve 92. The second pilot valve 32 is also connected to a remote control center computer. The fourth branch d facilitates continuous pressurization downstream of the pressure regulator under test 6, enabling various tests on the regulator's strength, sealing, and shut-off accuracy.

[0046] In the above embodiment, the pressure regulator 6 under test includes: a pressure-regulating diaphragm chamber pressure-bearing component and a pressure-cutting diaphragm chamber pressure-bearing component; the pressure-regulating diaphragm chamber pressure-bearing component is connected to the fourth branch d through a perforated plate, and a fifth solenoid valve 25 is provided on the perforated plate; the pressure-cutting diaphragm chamber pressure-bearing component is connected to the air passage of the fourth branch d through a perforated plate, and a sixth solenoid valve 26 is provided on the perforated plate. The pressure-regulating diaphragm chamber has a self-regulating pressure function when the fifth solenoid valve 25 is open, changing with the opening degree of the flow regulating valve 92; the pressure-cutting diaphragm chamber has a cutting-off function when the sixth solenoid valve 26 is open, that is, after the internal pressure reaches a certain level, the cutting-off device cuts off the flow of fluid in the pipe. The pressure regulator 6 under test is existing equipment, and the self-regulating pressure function and the cutting-off function are also existing technologies, which will not be described in detail.

[0047] For testing safety purposes, a protective cover 10 is installed around the pressure regulator under test 6. During actual testing, if some parameters of the pressure regulator under test 6 differ significantly from the standard, and the pressure inside the pipe is not properly controlled, accidents can easily occur, threatening the personal safety of the personnel. The design of the protective cover 10 effectively protects the personal safety of the personnel without affecting the test data results.

[0048] For the same safety purpose, an inlet butterfly valve 41 is installed between the inlet shut-off valve 81 and the inlet pressure gauge 51 on the main gas line, and an outlet butterfly valve 42 is installed between the outlet shut-off valve 82 and the outlet pressure gauge 52. The design of the inlet butterfly valve 41 and the outlet butterfly valve 42 is also for safety considerations. During the test, various accidents may occur, and the inlet butterfly valve 41 and the outlet butterfly valve 42 can be manually stopped immediately to avoid accidental loss of control.

[0049] A pressure regulator testing method for a pressure regulator testing system includes: pressure-bearing component strength testing, external seal testing, static characteristic factory testing, shut-off valve seat sealing performance testing, and shut-off pressure accuracy testing.

[0050] During the testing process, the strength test of the pressure-bearing components includes: shell strength test, pressure-bearing component strength test of the pressure-regulating diaphragm cavity, and pressure-bearing component strength test of the cut-off diaphragm cavity. The shell strength test includes the following steps: closing the fourth solenoid valve 24, the fifth solenoid valve 25, and the sixth solenoid valve 26; opening the inlet shut-off valve 81 to keep it in a flowing state; closing the outlet shut-off valve 82 to keep it in a blocked state; controlling the inlet pressure regulator 91 through the first controller 31 to pressurize the inlet of the pressure regulator 6 under test, which is in the open state, and maintaining the pressure for at least 3 minutes. The leakage status of the pressure regulator 6 under test; the strength test of the pressure-bearing component of the pressure regulating diaphragm cavity includes the following steps: opening the fifth solenoid valve 25 and the second solenoid valve 22, and pressurizing the outlet pipe section of the pressure regulator 6 under test through the second controller 32, with a pressure holding time of at least 3 minutes, and detecting the leakage status of the pressure-bearing component of the pressure regulating diaphragm cavity; the strength test of the pressure-bearing component of the pressure regulating diaphragm cavity includes the following steps: opening the sixth solenoid valve 26 and the second solenoid valve 22, and pressurizing the outlet pipe section of the pressure regulator 6 under test through the second controller 32, with a pressure holding time of at least 3 minutes, and detecting the leakage status of the pressure-bearing component of the pressure regulating diaphragm cavity. The shell strength test mainly tests the pressure regulating flow body of the pressure regulator 6 under test. Continuous pressurization is carried out at the inlet and outlet, and the pressure is kept constant when the preset value is reached. The specific pressurization parameters are determined by the product attributes and test standard values. Whether there is a leak is determined by the changes in the inlet pressure gauge 51 and the outlet pressure gauge 52 during the pressure holding time. Similarly, the fifth solenoid valve 25 and the sixth solenoid valve 26 need to be opened for the pressure regulating diaphragm cavity pressure bearing component strength test and the cut-off diaphragm cavity pressure bearing component strength test, respectively. Whether there is a leak is also determined by the changes in the pressure gauges during the pressure holding time. The second solenoid valve 22 controls the second pilot valve 32, and the fourth solenoid valve 24 controls whether the downstream pipeline is connected or not. The specific operation is controlled by the control center computer to control the second pilot valve 32, thereby controlling the outlet air source of the pressure regulator 6 under test.

[0051] As a preferred embodiment, the shell strength test is performed separately, while the pressure-bearing component strength test of the pressure-regulating diaphragm cavity and the pressure-bearing component strength test of the cut-off diaphragm cavity are performed simultaneously. Since both the pressure-bearing component strength test and the cut-off diaphragm cavity pressure-bearing component strength test require simultaneous pressure application upstream and downstream of the pressure regulator 6 under test, to test both properties simultaneously, it is only necessary to sequentially open the second solenoid valve 22, the fourth solenoid valve 24, the fifth solenoid valve 25, and the sixth solenoid valve 26 on top of the shell strength test. This creates a continuous pressure boost at the inlet and outlet of the pressure regulator 6 under test from both upstream and downstream air sources, allowing pressure to enter the pressure-bearing component of the pressure-regulating diaphragm cavity and the pressure-bearing component of the cut-off diaphragm cavity of the pressure regulator 6 under test, respectively. If the pressure gauge does not change within the pressure holding time, both tests meet the standard; if there is a change, the two tests are performed separately to identify the leaking components. At the same time, with a high pass rate, testing time can be greatly saved, testing efficiency can be guaranteed, and no non-compliant parts can be missed. However, the test pressure required for shell strength testing is higher than the other two test pressures, so it needs to be tested separately and the above test steps can be repeated. The difference lies in the input pressure.

[0052] To further improve testing efficiency, the external sealing test and the pressure-bearing component strength test are performed simultaneously. The steps include: spraying leak-detecting fluid onto the outer surface of the pressure regulator 6 under test; and checking for air bubbles on the surface of the pressure regulator 6 during the pressure-bearing component strength test. Since the pressure-bearing component strength test and the external sealing test are conducted under the same conditions—that is, continuous pressure is applied to the inlet and outlet of the pressure regulator 6 under test—and do not interfere with each other, leak points can be identified promptly when the pressure gauge changes during the above steps.

[0053] In this test method, the static characteristic factory test includes the following steps: Open the third solenoid valve 23 to keep the inlet shut-off valve 81 in a flowing state, output a constant pressure to the pressure regulator under test 6 through the inlet pressure regulator 91, and record the corresponding flow rate and pressure by controlling the opening of the flow regulating valve 92. Specifically, after the inlet pressure regulator 91 outputs a constant pressure, open the outlet shut-off valve and slowly control the opening of the flow regulating valve 92, recording the outlet pressure and flow rate at different flow regulating valve 92 positions. Then close the flow regulating valve 92 and record the pressure and flow rate measured at different opening positions of the flow regulating valve 92 during the closing process, until the flow regulating valve 92 slowly closes to the 0 position, the outlet shut-off valve is closed, and the outlet pressure of the pressure regulator under test 6 when closed is measured. The above data form a set of characteristic curves. The constant value is adjusted multiple times and the above steps are repeated. According to the model of the pressure regulator under test 6, the inspection qualification standard table is checked to determine whether the flow rate and pressure meet the requirements.

[0054] In this test method, the shut-off valve seat sealing test includes the following steps: keep the built-in shut-off device of the pressure regulator under test 6 in the shut-off state, close the second solenoid valve 22, the fourth solenoid valve 24, the fifth solenoid valve 25, the sixth solenoid valve 26 and the seventh solenoid valve, pressurize the inlet of the pressure regulator under test 6 through the first pilot device 31 and the inlet pressure regulator 91, immerse the outlet of the pressure regulator under test in water, and check the number of bubbles.

[0055] In this test method, the cut-off pressure accuracy test includes the following steps: opening the second solenoid valve 22 and the fourth solenoid valve 24, and continuously increasing the pressure at the outlet of the pressure regulator 6 under test through the second pilot device 32 until the pressure regulator 6 under test cuts off. During the above cut-off action, a fixture should be designed and equipped with a proximity switch 61, which should provide an analog signal upon reset and lose the analog signal upon cut-off. This fixture should be a movable / fixed structure. Multiple repeated tests should be performed to obtain the average cut-off value, which is then compared with the multiple cut-off values ​​to determine whether it meets the standard.

[0056] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A pressure regulator testing system, comprising a main air path, characterized in that, The main gas line is sequentially connected to an inlet pressure regulator, an inlet shut-off valve, a pressure regulator to be tested, an outlet shut-off valve, and a flow regulating valve. The pressure regulator under test is equipped with an inlet pressure gauge and an outlet pressure gauge at its inlet and outlet ends, respectively, to detect the pressure values ​​at the inlet and outlet ends of the pressure regulator under test. The inlet pressure regulator is connected to the inlet of the main gas path via a first branch. The first branch is equipped with a first solenoid valve and a first pilot valve. The first solenoid valve controls the inlet pressure of the first pilot valve. The inlet shut-off valve is connected to the inlet of the main gas circuit via a second branch. A third solenoid valve and a third pilot valve are installed on the second branch. The third solenoid valve is the switch for the inlet shut-off valve. The outlet shut-off valve is connected to a third branch, and a seventh solenoid valve is installed on the third branch. The seventh solenoid valve is connected in series with the third pilot device and in parallel with the third solenoid valve. The flow regulating valve adjusts the flow rate at the outlet of the main gas path; The outlet of the pressure regulator under test is connected to the inlet of the main gas path via a fourth branch. A second solenoid valve and a second pilot valve are installed on the fourth branch. The second solenoid valve controls the inlet pressure of the second pilot valve. A perforated plate is installed on the fourth branch at the outlet of the pressure regulator under test. A fourth solenoid valve is installed on the perforated plate. The fourth solenoid valve controls the downstream pressure of the second pilot valve. A flow meter is connected between the pressure regulator under test and the outlet shut-off valve. The pressure regulator under test includes: a pressure regulating diaphragm cavity bearing assembly and a pressure cutting diaphragm cavity bearing assembly; the pressure regulating diaphragm cavity bearing assembly is connected to the fourth branch through the perforated plate, and a fifth solenoid valve is provided on the perforated plate; the pressure cutting diaphragm cavity bearing assembly is connected to the fourth branch gas path through the perforated plate, and a sixth solenoid valve is provided on the perforated plate.

2. The voltage regulator testing system according to claim 1, characterized in that, The voltage regulator under test is equipped with a protective cover.

3. The voltage regulator testing system according to claim 2, characterized in that, An inlet butterfly valve is installed between the inlet shut-off valve and the inlet pressure gauge on the main gas line, and an outlet butterfly valve is installed between the outlet shut-off valve and the outlet pressure gauge.

4. A method for testing a voltage regulator, characterized in that, The pressure regulator testing system as described in claim 3 includes: pressure-bearing component strength testing, external seal testing, static characteristic factory testing, shut-off valve seat sealing performance testing, and shut-off pressure accuracy testing. The strength test of the pressure-bearing component includes: shell strength test, pressure regulating diaphragm cavity pressure-bearing component strength test and cut diaphragm cavity pressure-bearing component strength test; The shell strength test includes the following steps: closing the fourth solenoid valve, the fifth solenoid valve, and the sixth solenoid valve. The solenoid valve opens the inlet shut-off valve to keep it in a flowing state, and closes the outlet shut-off valve to keep it in a blocked state. The first controller controls the inlet pressure regulator to pressurize the inlet of the pressure regulator under test, which is in the open state, and maintains the pressure for at least 3 minutes to detect the leakage status of the pressure regulator under test. The strength test of the pressure-bearing component of the pressure regulating diaphragm cavity includes the following steps: opening the fifth solenoid valve and the second solenoid valve, pressurizing the outlet pipe section of the pressure regulator under test through the second controller, maintaining the pressure for at least 3 minutes, and detecting the leakage status of the pressure-bearing component of the pressure regulating diaphragm cavity. The strength test of the pressure-bearing component of the cut-off diaphragm cavity includes the following steps: opening the sixth solenoid valve and the second solenoid valve, pressurizing the outlet pipe section of the pressure regulator under test through the second controller, maintaining the pressure for at least 3 minutes, and detecting the leakage status of the pressure-bearing component of the pressure regulator diaphragm cavity. The shell strength test is performed separately, and the strength test of the pressure-bearing component of the pressure-regulating diaphragm cavity and the cutting of the diaphragm are also performed separately. Strength testing of the membrane cavity pressure-bearing component was conducted simultaneously. The external sealing test and the pressure-bearing component strength test are completed simultaneously, including the following steps: adjusting the pressure to be tested... Leak detection fluid is sprayed onto the outer surface of the device. During the strength test of the pressure-bearing component, check whether there are air bubbles on the surface of the pressure regulator under test. The static characteristic factory test includes the following steps: opening the third solenoid valve to keep the inlet shut-off valve in a flowing state, outputting a constant inlet pressure to the pressure regulator under test through the inlet pressure regulator, and recording the corresponding downstream flow and pressure of the pressure regulator under test by controlling the opening of the flow regulating valve; The shut-off valve seat sealing test includes the following steps: keeping the built-in shut-off unit of the pressure regulator under test in the shut-off state, closing the second, fourth, fifth, sixth, and seventh solenoid valves, pressurizing the inlet of the pressure regulator under test through the first pilot and the inlet pressure regulator, immersing the outlet of the pressure regulator under test in water, and checking the number of bubbles. The cut-off pressure accuracy test includes the following steps: opening the second solenoid valve and the fourth solenoid valve, and continuously increasing the pressure at the outlet end of the pressure regulator under test through the second controller until the pressure regulator under test cuts off.

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