A valve endurance life tester

Abstract

The application relates to the technical field of valve endurance life test, and discloses a valve endurance life test machine which comprises a control test table provided with a system pipeline, a pressure reducing valve, an inlet pressure gauge, a first stop valve, a first electromagnetic valve, a to-be-tested valve mounting position, an outlet pressure gauge, a second stop valve and a second electromagnetic valve; the pressure reducing valve, the inlet pressure gauge, the first stop valve, the to-be-tested valve mounting position, the outlet pressure gauge and the second stop valve are sequentially arranged on the system pipeline along the flow direction of test medium; the first electromagnetic valve is connected with the first stop valve and used for controlling the opening and closing of the first stop valve; and the second electromagnetic valve is connected with the second stop valve and used for controlling the opening and closing of the second stop valve. The valve endurance life test machine solves the technical problem that the pressure reducing valve is inconvenient to use in the test process in the prior art, and has the advantages of low cost, simple structure and convenient test.

Description

Technical Field

[0001] This invention relates to the field of valve durability life testing technology, and in particular to a valve durability life testing machine. Background Technology

[0002] A pressure reducing valve is a type of valve used to regulate fluid pressure. During operation, it typically regulates the outlet pressure through pressure changes within the valve body and the movement of components such as a diaphragm. Pressure reducing valves are subjected to repeated fluid pressure changes during long-term operation. When their internal components are subjected to continuous, periodic pressure variations, vibrations can easily occur. This is especially true when the operating pressure changes or the valve operates repeatedly, potentially leading to abnormal vibrations that affect the stability of the pressure reducing valve during operation.

[0003] Currently, to test the durability and long-term operating condition of pressure reducing valves, cyclic testing is typically required. This involves repeatedly applying the test medium to the valve to simulate its repeated operation during actual use. However, existing testing methods make it difficult to periodically adjust the flow of the test medium and pressure changes during cyclic testing. The testing process requires coordinated control of the pressure on both sides of the valve, making the cyclic testing operation cumbersome and inconvenient.

[0004] In view of this, the present invention proposes a valve durability life testing machine to solve the problems existing in the prior art. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of existing technologies by proposing a valve durability life testing machine.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A valve durability life testing machine includes a control test bench with system piping, a pressure reducing valve, an inlet pressure gauge, a first shut-off valve, a first solenoid valve, a valve under test mounting position, an outlet pressure gauge, a second shut-off valve, and a second solenoid valve. The pressure reducing valve, inlet pressure gauge, first shut-off valve, valve under test mounting position, outlet pressure gauge and second shut-off valve are sequentially arranged on the system pipeline along the flow direction of the test medium. The first solenoid valve is connected to the first shut-off valve and is used to control the opening and closing of the first shut-off valve; the second solenoid valve is connected to the second shut-off valve and is used to control the opening and closing of the second shut-off valve. The inlet pressure gauge is used to detect the pressure on the inlet side of the pressure reducing valve under test, and the outlet pressure gauge is used to detect the pressure on the outlet side of the pressure reducing valve under test. The first solenoid valve and the second solenoid valve control the first shut-off valve and the second shut-off valve to open and close periodically, so that the test medium acts periodically on the pressure reducing valve under test, thereby performing an impact cycle life test on the pressure reducing valve under test.

[0007] Furthermore, the inlet end of the system pipeline is used to connect to a test gas source, which is CDA or N2.

[0008] Furthermore, the pressure reducing valve is located upstream of the inlet pressure gauge and is used to reduce the pressure of the test medium input by the test gas source in order to regulate the test pressure entering the pressure reducing valve under test.

[0009] Furthermore, the inlet pressure gauge is positioned between the pressure reducing valve and the first shut-off valve, and the outlet pressure gauge is positioned between the installation position of the valve to be tested and the second shut-off valve.

[0010] Furthermore, the first shut-off valve is located on the inlet side of the pressure reducing valve under test, and the second shut-off valve is located on the outlet side of the pressure reducing valve under test, so as to control the test medium entering the pressure reducing valve under test and exiting the pressure reducing valve under test, respectively.

[0011] Furthermore, the first solenoid valve and the second solenoid valve are respectively connected to the first shut-off valve and the second shut-off valve, and the first solenoid valve and the second solenoid valve respectively drive the corresponding shut-off valve to periodically open and close, and the opening and closing states of the first shut-off valve and the second shut-off valve are opposite.

[0012] Furthermore, the first and second shut-off valves change their opening and closing states to create periodic pressure changes on the inlet and outlet sides of the pressure reducing valve under test, so as to perform an impact cycle life test on the diaphragm of the pressure reducing valve under test.

[0013] Furthermore, the first shut-off valve is initially in the open state, and the second shut-off valve is initially in the closed state.

[0014] Furthermore, the inlet end of the pressure reducing valve under test is connected to the first shut-off valve, and the outlet end of the pressure reducing valve under test is connected to the outlet pressure gauge. The pressure reducing valve under test, the first shut-off valve, and the second shut-off valve together form a cyclic test path for the pressure reducing valve under test.

[0015] The beneficial effects of this invention are as follows: It solves the technical problem of inconvenience in the testing process of pressure reducing valves in the existing technology, and also has the advantages of low cost, simple structure and convenient testing. Attached Figure Description

[0016] Figure 1 A schematic diagram of the control test bench structure for a valve durability life testing machine; Figure 2 This is a schematic diagram of the test circuit for a valve durability life testing machine.

[0017] In the diagram: 1. Control test bench; 2. Pressure reducing valve; 3. Inlet pressure gauge; 4. First shut-off valve; 5. First solenoid valve; 6. Installation position of the valve under test; 7. Outlet pressure gauge; 8. Second shut-off valve; 9. Second solenoid valve. Detailed Implementation

[0018] The technical solution of the present invention will be further described in detail below with reference to specific embodiments.

[0019] Reference Figures 1-2 A valve durability life testing machine includes a control test bench 1 with system piping, a pressure reducing valve 2, an inlet pressure gauge 3, a first shut-off valve 4, a first solenoid valve 5, a valve under test mounting position 6, an outlet pressure gauge 7, a second shut-off valve 8, and a second solenoid valve 9. By setting the above structure on the control test bench 1 and connecting each test component in sequence through the system piping, a test path for impact cycle life testing of the pressure reducing valve under test is formed, so that the pressure reducing valve under test can be tested under relatively stable test conditions. Pressure reducing valve 2, inlet pressure gauge 3, first shut-off valve 4, test valve mounting position 6, outlet pressure gauge 7, and second shut-off valve 8 are sequentially arranged on the system pipeline along the flow direction of the test medium. After the test medium enters the system pipeline, it first passes through pressure reducing valve 2 for pressure regulation, then passes through inlet pressure gauge 3 and first shut-off valve 4 to enter the test pressure reducing valve installed on the test valve mounting position 6, and then exits from the outlet side of the test pressure reducing valve through outlet pressure gauge 7 and second shut-off valve 8. Thus, pressure reducing valve 2, inlet pressure gauge 3, first shut-off valve 4, test pressure reducing valve, outlet pressure gauge 7, and second shut-off valve 8 together form a complete test medium flow path. Through the above sequential arrangement, the test medium can act on the test pressure reducing valve in the predetermined flow direction, and at the same time, it is convenient to detect the pressure status on the inlet and outlet sides of the test pressure reducing valve and to adjust the on / off state of the test medium. The first solenoid valve 5 is connected to the first shut-off valve 4 and is used to control the opening and closing of the first shut-off valve 4. The second solenoid valve 9 is connected to the second shut-off valve 8 and is used to control the opening and closing of the second shut-off valve 8. The first solenoid valve 5, through its connection with the first shut-off valve 4, can control the opening and closing of the test medium passage on the inlet side of the pressure reducing valve under test. The second solenoid valve 9, through its connection with the second shut-off valve 8, can control the opening and closing of the test medium passage on the outlet side of the pressure reducing valve under test. Thus, the two solenoid valves can be used to control the operation of the shut-off valves on both sides of the pressure reducing valve under test, providing a basis for the periodic pressure change of the pressure reducing valve under test. The inlet pressure gauge 3 is used to detect the pressure on the inlet side of the pressure reducing valve under test, and the outlet pressure gauge 7 is used to detect the pressure on the outlet side of the pressure reducing valve under test. The first solenoid valve 5 and the second solenoid valve 9 control the first shut-off valve 4 and the second shut-off valve 8 to open and close periodically, so that the test medium acts periodically on the pressure reducing valve under test, thereby performing an impact cycle life test on the pressure reducing valve under test. The pressure of the test medium before entering the pressure reducing valve can be obtained through the inlet pressure gauge 3, and the outlet pressure of the test medium after passing through the pressure reducing valve can be obtained through the outlet pressure gauge 7. Utilizing the coordinated detection of the inlet and outlet pressures allows for easy observation of pressure changes in the pressure reducing valve during cyclic testing. Simultaneously, the first solenoid valve 5 and the second solenoid valve 9 control the periodic opening and closing of the first shut-off valve 4 and the second shut-off valve 8, respectively, causing the pressure reducing valve to repeatedly experience the pressure of the test medium. This simulates the repeated pressure exerted on the pressure reducing valve during long-term operation, thus achieving the test of the pressure reducing valve's durability.

[0020] As a further embodiment of the present invention, the inlet end of the system pipeline is used to connect to a test gas source, which is CDA or N2. After the test gas source enters the system pipeline, it serves as the test medium required for the life test of the pressure reducing valve under test. The test gas is delivered to the pressure reducing valve under test through the system pipeline, so that the pressure reducing valve under test can undergo cycle life test under the predetermined test medium conditions.

[0021] As a further embodiment of the present invention, the pressure reducing valve 2 is located upstream of the inlet pressure gauge 3 to reduce the pressure of the test medium input by the test gas source, so as to adjust the test pressure entering the pressure reducing valve under test. By setting the pressure reducing valve 2, the test gas source can be prevented from directly entering the pressure reducing valve under test at a higher pressure, thereby facilitating the adjustment of the test pressure of the pressure reducing valve under test and improving the stability of the test pressure during the cycle life test.

[0022] As a further embodiment of the present invention, the inlet pressure gauge 3 is set between the pressure reducing valve 2 and the first shut-off valve 4, and the outlet pressure gauge 7 is set between the installation position 6 of the valve under test and the second shut-off valve 8. By setting the inlet pressure gauge 3 and the outlet pressure gauge 7 on both sides of the pressure reducing valve under test respectively, the inlet pressure and outlet pressure of the pressure reducing valve under test can be obtained respectively, thereby facilitating the observation and judgment of the pressure status during the cyclic test of the pressure reducing valve under test.

[0023] As a further embodiment of the present invention, the first shut-off valve 4 is disposed on the inlet side of the pressure reducing valve under test, and the second shut-off valve 8 is disposed on the outlet side of the pressure reducing valve under test, so as to control the test medium entering the pressure reducing valve under test and exiting the pressure reducing valve under test respectively. By distributing the two shut-off valves on the inlet and outlet sides of the pressure reducing valve under test respectively, the flow state of the test medium on both sides of the pressure reducing valve under test can be changed, thereby providing conditions for the pressure reducing valve under test to form periodic pressure changes.

[0024] As a further embodiment of the present invention, the first solenoid valve 5 and the second solenoid valve 9 are respectively connected to the first shut-off valve 4 and the second shut-off valve 8. The first solenoid valve 5 and the second solenoid valve 9 drive the corresponding shut-off valves to periodically open and close, and the opening and closing states of the first shut-off valve 4 and the second shut-off valve 8 are opposite. By driving the corresponding shut-off valves to operate, the first shut-off valve 4 and the second shut-off valve 8 can change their on / off states in a mutually coordinated manner. When the first shut-off valve 4 is in the open state, the second shut-off valve 8 is in the closed state; when the first shut-off valve 4 changes to the closed state, the second shut-off valve 8 changes to the open state accordingly, thereby alternating the test medium passages on the inlet and outlet sides of the pressure reducing valve under test. Through the above alternating changes, the test medium can exert periodic pressure impacts on the pressure reducing valve under test.

[0025] As a further aspect of this invention, the first shut-off valve 4 and the second shut-off valve 8, through changes in their opening and closing states, create periodic pressure changes on the inlet and outlet sides of the pressure reducing valve under test. This allows for impact cycle life testing of the diaphragm of the pressure reducing valve under test. Since the first shut-off valve 4 and the second shut-off valve 8 are located on the inlet and outlet sides of the pressure reducing valve under test, respectively, when the two shut-off valves operate in opposite opening and closing states, the on / off state of the test medium on both sides of the pressure reducing valve under test changes accordingly, causing the pressure state borne by the pressure reducing valve under test to change periodically. During repeated cycles, the diaphragm inside the pressure reducing valve under test repeatedly endures pressure and undergoes corresponding working deformation as the test medium pressure changes. This simulates the repeated working state of the diaphragm during long-term use of the pressure reducing valve under test, thereby achieving the testing of the durability performance of the diaphragm of the pressure reducing valve under test.

[0026] As a further aspect of this invention, the first shut-off valve 4 is initially in an open state, and the second shut-off valve 8 is initially in a closed state. When the cyclic life test begins, the first shut-off valve 4 is in the open state, allowing the test medium to enter the pressure reducing valve under test from the system pipeline through the first shut-off valve 4. Simultaneously, the second shut-off valve 8 is in the closed state, cutting off the test medium passage at the outlet side of the pressure reducing valve under test. Using this as the initial state for the cyclic test facilitates the first solenoid valve 5 and the second solenoid valve 9 to drive the first shut-off valve 4 and the second shut-off valve 8 to perform subsequent periodic actions, causing the opening and closing states of the two shut-off valves to alternate, thereby allowing the pressure reducing valve under test to repeatedly withstand the pressure of the test medium.

[0027] As a further embodiment of the present invention, the inlet end of the pressure reducing valve under test is connected to the first shut-off valve 4, and the outlet end of the pressure reducing valve under test is connected to the outlet pressure gauge 7. The pressure reducing valve under test, the first shut-off valve 4, and the second shut-off valve 8 together form a cyclic test path for the pressure reducing valve under test.

[0028] Working principle: During the test, the pressure reducing valve under test is installed in the valve mounting position 6, with its inlet end connected to the first shut-off valve 4 and its outlet end connected to the outlet pressure gauge 7. CDA or N2 is then introduced into the system pipeline as the test medium. The test medium first passes through the pressure reducing valve 2 for pressure regulation, then passes through the inlet pressure gauge 3 and the first shut-off valve 4 before entering the pressure reducing valve under test. The pressure at the outlet side of the pressure reducing valve under test is detected by the outlet pressure gauge 7.

[0029] After the test pressure adjustment is completed, the first solenoid valve 5 and the second solenoid valve 9 drive the first shut-off valve 4 and the second shut-off valve 8 to open and close periodically, keeping the first shut-off valve 4 and the second shut-off valve 8 in opposite open and closed states. As a result, the passage of the test medium into and out of the pressure reducing valve under test changes periodically, causing the diaphragm inside the pressure reducing valve under test to be repeatedly subjected to pressure, thereby achieving the impact cycle life test of the pressure reducing valve under test.

[0030] During the cyclic test, the pressure status at the inlet of the pressure reducing valve under test can be observed through the inlet pressure gauge 3, and the pressure status at the outlet of the pressure reducing valve under test can be observed through the outlet pressure gauge 7, so as to understand the change in the working pressure of the pressure reducing valve under test during the cyclic test.

[0031] Test steps: S1, according to Figure 2 As shown, connect the pressure reducing valve under test to the test system (ensure that all valves in the test system are closed before connection). Keep the pressure reducing valve under test closed and record the type of medium in the system pipeline. S2, Adjust the pressure reducing valve (2)RG1 to make the pressure gauge (3)P1 of the pressure reducing valve under test read MIRP, and open the first shut-off valve (4)V1; S3, the second shut-off valve (8) V2 is kept closed. Adjust the pressure reducing valve to be tested so that the outlet pressure gauge (7) reading P2 is MORP. S4. Set the operating frequency of the first solenoid valve (5) S1 and control the opening and closing cycle of the first shut-off valve (4) V1 to be 6s closed and 6s open (the first shut-off valve (4) V1 is initially in the open state), that is, the pressure reducing valve under test has a cycle life of 5 times / min. S5. Set the operating frequency of the second solenoid valve (9) S2 and control the opening and closing cycle of the second shut-off valve (8) V2 to be 6s open and 6s closed (the second shut-off valve (8) V2 is initially in the closed state), that is, the pressure reducing valve under test has a cycle life of 5 times / min. S6. When the cycle life of the pressure reducing valve under test reaches 1000 times, disconnect the first solenoid valve (5) S1 and the second solenoid valve (9) S2, close the first shut-off valve (4) V1, open the second shut-off valve (8) V2, release the internal pressure of the test system pipeline, and disassemble the pressure reducing valve under test. S7. Conduct a sealing test on the pressure reducing valve to be tested; S8. When the sealing test is qualified, repeat the operation steps S1-S6. When the sealing test is unqualified, stop the cycle life test and record the relevant cycle life test data. S9. When the cumulative number of cycle life tests is ≥5000, the test may be terminated as appropriate.

[0032] After the test is completed, close the first shut-off valve (4) V1, remove the pressure reducing valve under test, and the pressure reducing valve under test is qualified when the cumulative cycle life test number is ≥5000 times.

[0033] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A valve durability life testing machine, characterized in that, The system includes a control test bench (1) with system piping, a pressure reducing valve (2), an inlet pressure gauge (3), a first shut-off valve (4), a first solenoid valve (5), a valve under test mounting position (6), an outlet pressure gauge (7), a second shut-off valve (8), and a second solenoid valve (9). The pressure reducing valve (2), inlet pressure gauge (3), first shut-off valve (4), valve under test mounting position (6), outlet pressure gauge (7) and second shut-off valve (8) are sequentially arranged on the system pipeline along the flow direction of the test medium; The first solenoid valve (5) is connected to the first shut-off valve (4) and is used to control the opening and closing of the first shut-off valve (4). The second solenoid valve (9) is connected to the second shut-off valve (8) and is used to control the opening and closing of the second shut-off valve (8). The inlet pressure gauge (3) is used to detect the pressure on the inlet side of the pressure reducing valve under test, and the outlet pressure gauge (7) is used to detect the pressure on the outlet side of the pressure reducing valve under test. The first solenoid valve (5) and the second solenoid valve (9) control the first shut-off valve (4) and the second shut-off valve (8) to open and close periodically, so that the test medium acts periodically on the pressure reducing valve under test, thereby performing an impact cycle life test on the pressure reducing valve under test.

2. The valve durability life testing machine according to claim 1, characterized in that, The inlet end of the system pipeline is used to connect to the test gas source, which is CDA or N2.

3. The valve durability life testing machine according to claim 1, characterized in that, The pressure reducing valve (2) is located upstream of the inlet pressure gauge (3) and is used to reduce the pressure of the test medium input by the test gas source in order to adjust the test pressure entering the pressure reducing valve under test.

4. The valve durability life testing machine according to claim 1, characterized in that, The inlet pressure gauge (3) is located between the pressure reducing valve (2) and the first shut-off valve (4), and the outlet pressure gauge (7) is located between the valve to be tested mounting position (6) and the second shut-off valve (8).

5. A valve durability life testing machine according to claim 1, characterized in that, The first shut-off valve (4) is located on the inlet side of the pressure reducing valve under test, and the second shut-off valve (8) is located on the outlet side of the pressure reducing valve under test, so as to control the test medium entering the pressure reducing valve under test and exiting the pressure reducing valve under test respectively.

6. A valve durability life testing machine according to claim 1, characterized in that, The first solenoid valve (5) and the second solenoid valve (9) are respectively connected to the first shut-off valve (4) and the second shut-off valve (8). The first solenoid valve (5) and the second solenoid valve (9) drive the corresponding shut-off valve to open and close periodically, and the opening and closing states of the first shut-off valve (4) and the second shut-off valve (8) are opposite.

7. A valve durability life testing machine according to claim 6, characterized in that, The first shut-off valve (4) and the second shut-off valve (8) change their opening and closing states to create periodic pressure changes on the inlet and outlet sides of the pressure reducing valve under test, so as to perform an impact cycle life test on the diaphragm of the pressure reducing valve under test.

8. A valve durability life testing machine according to claim 7, characterized in that, The first shut-off valve (4) is initially in the open state, and the second shut-off valve (8) is initially in the closed state.

9. A valve durability life testing machine according to claim 1, characterized in that, The inlet end of the pressure reducing valve under test is connected to the first shut-off valve (4), and the outlet end of the pressure reducing valve under test is connected to the outlet pressure gauge (7). The pressure reducing valve under test, the first shut-off valve (4), and the second shut-off valve (8) together form a cyclic test path for the pressure reducing valve under test.

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