A servo valve testing device and method based on integrated oil circuit block testing technology

Abstract

This invention relates to a servo valve testing device and method based on integrated oil circuit block testing technology. In the test circuit, two flow rates—large no-load flow and small no-load flow—are provided to the valve under test according to testing requirements. The device includes a directional cover-type cartridge valve control assembly, a pressure-type cover-type cartridge valve control assembly, a solenoid directional valve, a temperature sensor, a pressure sensor, and a flow sensor. The three directional cover-type cartridge valve control assemblies are respectively connected to ports A, B, and P of the valve under test. The pressure-type cover-type cartridge valve control assembly is connected to port T of the valve under test via a fourth directional cover-type cartridge valve control assembly. Pressure sensors are installed on all connecting oil lines. A pressure sensor and a temperature sensor are installed on the connecting oil line between the pressure-type cover-type cartridge valve control assembly and the fourth directional cover-type cartridge valve control assembly. A temperature sensor is installed on the connecting oil line between the first directional cover-type cartridge valve control assembly and port P of the valve under test.

Description

Technical Field

[0001] This invention relates to the field of hydraulic valve testing technology, specifically to a servo valve testing device and method based on integrated hydraulic circuit block testing technology. Background Technology

[0002] With the increasing demand for servo valves from various industries both domestically and internationally in recent years, more models of servo valves have emerged accordingly. As high-precision hydraulic components, servo valves require testing for numerous performance indicators. Traditional test benches mostly use pipeline connections, resulting in numerous pipe joints and manual ball valves, which are prone to leaks. The threads on the ball valve handles are constantly in use, easily accumulating foreign matter that enters the pipeline, increasing equipment management costs and complexity. Traditional test benches require various adapter plates and manually switching shut-off valves to meet testing requirements. In some cases, different test benches are even needed to test servo valve performance indicators, severely impacting production efficiency and increasing the risk of foreign matter accumulation during turnover. Therefore, automated integrated hydraulic circuit block testing devices are urgently needed. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a servo valve testing device and method for integrated oil circuit block testing technology for servo valve performance, which overcomes the above-mentioned technical defects, eliminates the need to adjust the system back pressure through throttle valves and achieve different performance index tests through manual ball valve switching, etc., and realizes automated testing of servo valve performance indexes through electrical control, reduces process disassembly and turnover, eliminates the generation of waste, and improves production efficiency.

[0004] To achieve the above objectives, the technical solution of the present invention is: a servo valve testing device based on integrated oil circuit block testing technology. In the test circuit, two flow rates—large no-load flow and small no-load flow—are provided to the valve under test according to the test requirements. The device consists of a directional cover-type cartridge valve control assembly, a pressure-type cover-type cartridge valve control assembly, a solenoid directional valve, a test auxiliary device, a temperature sensor, a pressure sensor, and a flow sensor. The first, second, and third directional cover-type cartridge valve control assemblies are respectively connected to ports A, B, and P of the valve under test. The pressure-type cover-type cartridge valve control assembly is connected to port T of the valve under test through a fourth directional cover-type cartridge valve control assembly. Pressure sensors are installed on all connecting oil circuits. The pressure-type cover-type cartridge valve control assembly and the fourth directional cover-type cartridge valve control assembly... Pressure and temperature sensors are installed on the connecting oil lines between valve control components. A temperature sensor is installed on the connecting oil line between the first directional cover-type cartridge valve control component and the P port of the valve under test. The first directional cover-type cartridge valve control component is connected to a pump station. A first solenoid directional valve and a second solenoid directional valve are connected in series in the test circuits of the second and third directional cover-type cartridge valve control components. A third solenoid directional valve and a fourth solenoid directional valve are connected in series in the circuit of the fourth directional cover-type cartridge valve control component. A flow sensor is installed on the connecting oil line between the first and second solenoid directional valves. A flow sensor is also installed on the connecting oil line between the second and third directional cover-type cartridge valve control components.

[0005] Furthermore, the test auxiliary device includes a dedicated valve block and a pressure measuring connector, which are installed on the test circuit.

[0006] Furthermore, the directional cover-type cartridge valve control assembly, the pressure cover-type cartridge valve control assembly, the solenoid directional valve, the test auxiliary device, the temperature sensor, the pressure sensor, and the flow sensor are integrated together.

[0007] A servo valve testing method employs a servo valve testing device based on integrated hydraulic block testing technology. In this test circuit, two flow rates—large no-load flow rate and small no-load flow rate—are provided to the valve under test according to the testing requirements. During the performance testing of the valve under test, the solenoid valves DT1 and DT9 in the first directional cover-type cartridge valve control assembly and the fourth directional cover-type cartridge valve control assembly are energized first. When a large flow rate is required, the solenoid valves DT5 and DT6 in the second directional cover-type cartridge valve control assembly and the third directional cover-type cartridge valve control assembly are energized. When a small flow rate is required, the first solenoid directional valve DT3 and the second solenoid directional valve DT4 are energized.

[0008] Furthermore, when it is necessary to conduct no-load high flow rate characteristic tests:

[0009] Step 1: Turn on the power switch of the pump station to energize the solenoid valve DT1 in the first directional cover-type cartridge valve control assembly and supply high-pressure hydraulic oil to the test circuit;

[0010] Step 2: Energize the solenoid valve DT5 in the second-direction cover-type cartridge valve control assembly and the solenoid valve DT6 in the third-direction cover-type cartridge valve control assembly so that the A port and B port of the valve under test have the conditions for high flow rate testing.

[0011] Step 3: Energize the solenoid valve DT9 in the fourth-direction cover-type cartridge valve control assembly so that the T port of the valve under test is connected to the pressure-type cover-type cartridge valve control assembly;

[0012] Step 4: Adjust the proportional pressure valve in the pressure-type cover-type cartridge valve control assembly, and collect data from the temperature sensor, pressure sensor, and flow sensor respectively.

[0013] Furthermore, when it is necessary to conduct no-load low-flow characteristic tests:

[0014] Step 1: Turn on the power switch of the pump station to energize the solenoid valve DT1 of the first directional cover-type cartridge valve control component and supply high-pressure hydraulic oil to the test circuit;

[0015] Step 2: Energize solenoid valve DT3 in the first solenoid directional valve and solenoid valve DT4 in the second solenoid directional valve so that the A port and B port of the valve under test are equipped with low flow test conditions.

[0016] Step 3: Energize the solenoid valve DT9 in the fourth-direction cover-type cartridge valve control assembly so that the T port of the valve under test is connected to the pressure-type cover-type cartridge valve control assembly;

[0017] Step 4: Adjust the proportional pressure valve in the pressure-type cover-type cartridge valve control assembly, and collect data from the temperature sensor, pressure sensor, and flow sensor respectively.

[0018] Furthermore, when resolution and null-position characteristic tests are required:

[0019] Step 1: Turn on the power switch of the pump station to energize the solenoid valve DT1 in the first directional cover-type cartridge valve control assembly and supply high-pressure hydraulic oil to the test circuit;

[0020] Step 2: Energize the first solenoid directional valve DT3 and the second solenoid directional valve DT4 so that the A port and B port of the valve under test are equipped with low flow test conditions.

[0021] Step 3: Energize the solenoid valve DT9 in the fourth-direction cover-type cartridge valve control assembly so that the T port of the valve under test is connected to the pressure-type cover-type cartridge valve control assembly;

[0022] Step 4: Adjust the proportional pressure valve in the pressure-type cover-type cartridge valve control assembly, and collect data from the temperature sensor, pressure sensor, and flow sensor respectively.

[0023] Furthermore, when a pressure gain test is required:

[0024] Step 1: Turn on the power switch of the pump station to energize the solenoid valve DT1 in the first directional cover-type cartridge valve control assembly and supply high-pressure hydraulic oil to the test circuit;

[0025] Step 2: Energize the solenoid valve DT9 in the fourth-direction cover-type cartridge valve control assembly so that the T port of the valve under test is connected to the pressure-type cover-type cartridge valve control assembly;

[0026] Step 3: Adjust the proportional pressure valve in the pressure-type cover-type cartridge valve control assembly, and collect data from the temperature sensor and pressure sensor respectively.

[0027] Furthermore, when internal leakage testing is required:

[0028] Step 1: Turn on the power switch of the pump station to energize the solenoid valve DT1 in the first directional cover-type cartridge valve control assembly and supply high-pressure hydraulic oil to the test circuit;

[0029] Step 2: Energize the third solenoid directional valve DT7 and the fourth solenoid directional valve DT8 to enable the T port of the valve under test to meet the low flow test conditions.

[0030] Step 3: Collect data from the temperature sensor, pressure sensor, and flow sensor respectively, and collect internal leakage data of the valve under test.

[0031] The beneficial effects of this invention are:

[0032] The servo valve testing device and method of the present invention, which integrates oil circuit block testing technology for servo valve performance, can overcome the defects of existing technology. It eliminates the need to adjust the system back pressure through throttle valves and switch different performance indicators through manual ball valves. It uses electrical control to realize automated testing of servo valve performance indicators, reduces disassembly and turnover in the process, eliminates the generation of waste materials, and improves production efficiency. Attached Figure Description

[0033] Figure 1 This is a hydraulic schematic diagram of the device for testing servo valves according to the present invention;

[0034] Figure 2 This is a schematic diagram of the device structure for testing servo valves according to the present invention;

[0035] In the diagram: 1-1-0, Directional type cover-type cartridge valve control assembly; 1-1-1, First directional type cover-type cartridge valve control assembly; 1-1-2, Second directional type cover-type cartridge valve control assembly; 1-1-3, Third directional type cover-type cartridge valve control assembly; 1-1-4, Fourth directional type cover-type cartridge valve control assembly; 1-2-1, Pressure type cover-type cartridge valve control assembly; 1-3-0, Solenoid directional valve; 1-3-1, The... 1. Electromagnetic directional valve; 1-3-2. Second electromagnetic directional valve; 1-3-3. Third electromagnetic directional valve; 1-3-4. Fourth electromagnetic directional valve; 1-4-0. Test auxiliary device; 1-4-1. Special valve block; 1-4-2. Pressure measuring connector; 1-5-1. 1-5-2. First and second temperature sensors; 1-6-1 to 1-6-5. First to fifth pressure sensors; 1-7-1. 1-7-2. First and second flow sensors. Detailed Implementation

[0036] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0037] like Figure 1 As shown in Figure 2, the servo valve testing device based on integrated oil circuit block testing technology provided by the present invention consists of an integrated directional cover-type cartridge valve control component 1-1-0, a pressure cover-type cartridge valve control component 1-2-1, an electromagnetic reversing valve 1-3-0, a test auxiliary device 1-4-0, a temperature sensor 1-5-0, a pressure sensor 1-6-0, and a flow sensor 1-7-0.

[0038] The directional cover-type cartridge valve control assembly 1-1-0 includes a first directional cover-type cartridge valve control assembly 1-1-1, a second directional cover-type cartridge valve control assembly 1-1-2, a third directional cover-type cartridge valve control assembly 1-1-3, and a fourth directional cover-type cartridge valve control assembly 1-1-4. The first directional cover-type cartridge valve control assembly 1-1-1 is connected to the test circuit and provides high-pressure hydraulic oil to the test circuit through the solenoid valve DT1 connected to the start pump. The second directional cover-type cartridge valve control assembly 1-1-2 is connected to port A of the valve under test and is energized through the solenoid valve DT5 to enable port A of the valve under test to meet the high-flow test conditions. The third directional cover-type cartridge valve control assembly 1-1-3 is connected to port B of the valve under test and is energized through the solenoid valve DT6 to enable port B of the valve under test to meet the high-flow test conditions. The pressure type cover-type cartridge valve control assembly 1-2-1 is connected to port T of the valve under test through the fourth directional cover-type cartridge valve control assembly 1-1-4 and is energized through the solenoid valve DT9 to enable port T of the valve under test to communicate with the pressure type cover-type cartridge valve control assembly 1-2-1.

[0039] The electromagnetic directional valve 1-3-0 includes a first electromagnetic directional valve 1-3-1, a second electromagnetic directional valve 1-3-2, a third electromagnetic directional valve 1-3-3, and a fourth electromagnetic directional valve 1-3-4. The first electromagnetic directional valve 1-3-1 and the second electromagnetic directional valve 1-3-2 are connected in series in the test circuit of the second directional cover-type cartridge valve control assembly 1-1-2 and the third directional cover-type cartridge valve control assembly 1-1-3. The third electromagnetic directional valve 1-3-3 and the fourth electromagnetic directional valve 1-3-4 are connected in series in the circuit of the fourth directional cover-type cartridge valve control assembly 1-1-4. A pressure test connector 1-4-2 is provided on the oil line connecting the third electromagnetic directional valve 1-3-3 and the first electromagnetic directional valve 1-3-1, and on the oil line connecting the fourth electromagnetic directional valve 1-3-4 and the second electromagnetic directional valve 1-3-2. A second flow sensor 1-7-2 is installed on the oil line connecting the first solenoid directional valve 1-3-1 and the second solenoid directional valve 1-3-2.

[0040] A first temperature sensor 1-5-1 and a first pressure sensor 1-6-1 are installed on the oil line connecting the first directional cover-type cartridge valve control assembly 1-1-1 to the P port of the valve under test; a third pressure sensor 1-6-3 is installed on the oil line connecting the second directional cover-type cartridge valve control assembly 1-1-2 to the first solenoid directional valve 1-3-1; a fourth pressure sensor 1-6-4 is installed on the oil line connecting the third directional cover-type cartridge valve control assembly 1-1-3 to the fourth solenoid directional valve 1-3-4; a fifth pressure sensor 1-6-5 and a second temperature sensor 1-5-2 are installed on the oil line connecting the pressure-type cover-type cartridge valve control assembly 1-2-1 to the fourth directional cover-type cartridge valve control assembly 1-1-4; and a second pressure sensor 1-6-2 is installed on the oil line connecting the fourth directional cover-type cartridge valve control assembly 1-1-4 to the T port of the valve under test. A first flow sensor 1-7-1 is installed on the oil line connecting the second directional cover-type cartridge valve control assembly 1-1-2 and the third directional cover-type cartridge valve control assembly 1-1-3.

[0041] In this test circuit, the valve under test is provided with two flow rates: large flow rate under no-load and small flow rate under no-load, according to the test requirements.

[0042] The apparatus described in this invention is used to test the performance of a servo valve, and can employ test methods suitable for the object under test.

[0043] When it is necessary to perform no-load flow (high flow) characteristic testing:

[0044] Step 1: Turn on the power switch of the pump station to energize the solenoid valve DT1 in the first directional cover-type cartridge valve control assembly 1-1-1, and supply high-pressure hydraulic oil to the test circuit;

[0045] Step 2: Energize the solenoid valve DT5 in the second directional cover-type cartridge valve control assembly 1-1-2 and the solenoid valve DT6 in the third directional cover-type cartridge valve control assembly 1-1-3, so that the A port and B port of the valve under test have the conditions for high flow rate testing.

[0046] Step 3: Energize the solenoid valve DT9 in the fourth-direction type cover-type cartridge valve control assembly 1-1-4 so that the T port of the valve under test is connected to the pressure type cover-type cartridge valve control assembly 1-2-1;

[0047] Step 4: Adjust the proportional pressure valve in the pressure-type cover-type cartridge valve control assembly 1-2-1, and collect data from the first and second temperature sensors 1-5-1 and 1-5-2, the first to fifth pressure sensors 1-6-1 to 1-6-5, and the first flow sensor 1-7-1 respectively.

[0048] When it is necessary to perform no-load flow (low flow) characteristic testing:

[0049] Step 1: Turn on the power switch of the pump station to energize the solenoid valve DT1 of the first directional cover-type cartridge valve control component 1-1-1, and supply high-pressure hydraulic oil to the test circuit;

[0050] Step 2: Energize the solenoid valve DT3 in the first solenoid directional valve 1-3-1 and the solenoid valve DT4 in the second solenoid directional valve 1-3-2 so that the A port and B port of the valve under test are equipped with the conditions for small flow test.

[0051] Step 3: Energize the solenoid valve DT9 in the fourth-direction type cover-type cartridge valve control assembly 1-1-4 so that the T port of the valve under test is connected to the pressure type cover-type cartridge valve control assembly 1-2-1;

[0052] Step 4: Adjust the proportional pressure valve in the pressure-type cover-type cartridge valve control assembly 1-2-1, and collect data from the first and second temperature sensors 1-5-1 and 1-5-2, the first to fifth pressure sensors 1-6-1 to 1-6-5, and the second flow sensor 1-7-2 respectively.

[0053] When resolution and null-position characteristic tests are required:

[0054] Step 1: Turn on the power switch of the pump station to energize the solenoid valve DT1 in the first directional cover-type cartridge valve control assembly 1-1-1, and supply high-pressure hydraulic oil to the test circuit;

[0055] Step 2: Energize the solenoid valve DT3 in the first solenoid directional valve 1-3-1 and the solenoid valve DT4 in the second solenoid directional valve 1-3-2 so that the A port and B port of the valve under test are equipped with the conditions for small flow test.

[0056] Step 3: Energize the solenoid valve DT9 in the fourth-direction type cover-type cartridge valve control assembly 1-1-4 so that the T port of the valve under test is connected to the pressure type cover-type cartridge valve control assembly 1-2-1;

[0057] Step 4: Adjust the proportional pressure valve in the pressure-type cover-type cartridge valve control assembly 1-2-1, and collect data from the first and second temperature sensors 1-5-1 and 1-5-2, the first to fifth pressure sensors 1-6-1 to 1-6-5, and the second flow sensor 1-7-2 respectively.

[0058] When a pressure gain test is required:

[0059] Step 1: Turn on the power switch of the pump station to energize the solenoid valve DT1 in the first directional cover-type cartridge valve control assembly 1-1-1, and supply high-pressure hydraulic oil to the test circuit;

[0060] Step 2: Energize the solenoid valve DT9 in the fourth-direction type cover-type cartridge valve control assembly 1-1-4 so that the T port of the valve under test is connected to the pressure type cover-type cartridge valve control assembly 1-2-1;

[0061] Step 3: Adjust the proportional pressure valve in the pressure-type cover-type cartridge valve control assembly 1-2-1, and collect data from the first and second temperature sensors 1-5-1 and 1-5-2, and the first, second, and fifth pressure sensors 1-6-1, 1-6-2, and 1-6-5 respectively.

[0062] When internal leakage testing is required:

[0063] Step 1: Turn on the power switch of the pump station to energize the solenoid valve DT1 in the first directional cover-type cartridge valve control assembly 1-1-1, and supply high-pressure hydraulic oil to the test circuit;

[0064] Step 2: Energize the solenoid valve DT7 in the third solenoid directional valve 1-3-3 and the solenoid valve DT8 in the fourth solenoid directional valve 1-3-4 so that the T port of the valve under test has the conditions for small flow test.

[0065] Step 3: Collect data from the first temperature sensor 1-5-1, the first and second pressure sensors 1-6-1 and 1-6-2, and the second flow sensor 1-7-2 respectively, and collect the internal leakage data of the valve under test.

[0066] The steps described above together constitute a method for testing servo valves.

Claims

1. A servo valve testing device based on integrated oil circuit block testing technology, wherein in the test circuit, two flow rates, namely, large no-load flow rate and small no-load flow rate, are provided to the valve under test according to the test requirements, characterized in that: The device consists of a directional cover-type cartridge valve control assembly, a pressure-type cover-type cartridge valve control assembly, a solenoid directional valve, test auxiliary devices, a temperature sensor, a pressure sensor, and a flow sensor. The first, second, and third directional cover-type cartridge valve control assemblies are connected to ports A, B, and P of the valve under test, respectively. The pressure-type cover-type cartridge valve control assembly is connected to port T of the valve under test via a fourth directional cover-type cartridge valve control assembly. Pressure sensors are installed on all connecting oil lines. A pressure sensor and a temperature sensor are installed on the connecting oil line between the pressure-type and fourth directional cover-type cartridge valve control assemblies. A temperature sensor is installed on the connecting oil line between the first directional cover-type cartridge valve control assembly and port P of the valve under test. The first directional cover-type cartridge valve control assembly is connected to a pump station; the second directional cover-type... The test circuits of the directional cartridge valve control assembly and the third-direction cover-type cartridge valve control assembly are equipped with a first solenoid directional valve and a second solenoid directional valve connected in series. The circuit of the fourth-direction cover-type cartridge valve control assembly is equipped with a third solenoid directional valve and a fourth solenoid directional valve connected in series. A flow sensor is installed on the oil line connecting the first and second solenoid directional valves, and a flow sensor is also installed on the oil line connecting the second and third-direction cover-type cartridge valve control assemblies. The test auxiliary device includes a dedicated valve block and a pressure measuring connector, which are installed on the test circuit. The directional cover-type cartridge valve control assembly, the pressure cover-type cartridge valve control assembly, the solenoid directional valve, the test auxiliary device, the temperature sensor, the pressure sensor, and the flow sensor are integrated together.

2. A servo valve testing method, characterized in that: The servo valve testing device based on integrated oil circuit block testing technology as described in claim 1 provides two flow rates—large no-load flow and small no-load flow—to the valve under test according to the testing requirements. During the performance testing of the valve under test, the solenoid valves DT1 and DT9 in the first directional cover-type cartridge valve control assembly are energized first. When a large flow rate is required, the solenoid valves DT5 and DT6 in the second directional cover-type cartridge valve control assembly are energized; when a small flow rate is required, the first solenoid directional valve DT3 and the second solenoid directional valve DT4 are energized.

3. The servo valve testing method according to claim 2, characterized in that: When it is necessary to perform a high flow rate characteristic test under no-load conditions: Step 1: Turn on the power switch of the pump station to energize the solenoid valve DT1 in the first directional cover-type cartridge valve control assembly and supply high-pressure hydraulic oil to the test circuit; Step 2: Energize the solenoid valve DT5 in the second-direction cover-type cartridge valve control assembly and the solenoid valve DT6 in the third-direction cover-type cartridge valve control assembly so that the A port and B port of the valve under test have the conditions for high flow rate testing. Step 3: Energize the solenoid valve DT9 in the fourth-direction cover-type cartridge valve control assembly so that the T port of the valve under test is connected to the pressure-type cover-type cartridge valve control assembly; Step 4: Adjust the proportional pressure valve in the pressure-type cover-type cartridge valve control assembly, and collect data from the temperature sensor, pressure sensor, and flow sensor respectively.

4. The servo valve testing method according to claim 2, characterized in that: When it is necessary to perform no-load low-flow characteristic testing: Step 1: Turn on the power switch of the pump station to energize the solenoid valve DT1 of the first directional cover-type cartridge valve control component and supply high-pressure hydraulic oil to the test circuit; Step 2: Energize solenoid valve DT3 in the first solenoid directional valve and solenoid valve DT4 in the second solenoid directional valve so that the A port and B port of the valve under test are equipped with low flow test conditions. Step 3: Energize the solenoid valve DT9 in the fourth-direction cover-type cartridge valve control assembly so that the T port of the valve under test is connected to the pressure-type cover-type cartridge valve control assembly; Step 4: Adjust the proportional pressure valve in the pressure-type cover-type cartridge valve control assembly, and collect data from the temperature sensor, pressure sensor, and flow sensor respectively.

5. The servo valve testing method according to claim 2, characterized in that: When resolution and null-position characteristic tests are required: Step 1: Turn on the power switch of the pump station to energize the solenoid valve DT1 in the first directional cover-type cartridge valve control assembly and supply high-pressure hydraulic oil to the test circuit; Step 2: Energize the first solenoid directional valve DT3 and the second solenoid directional valve DT4 so that the A port and B port of the valve under test are equipped with low flow test conditions. Step 3: Energize the solenoid valve DT9 in the fourth-direction cover-type cartridge valve control assembly so that the T port of the valve under test is connected to the pressure-type cover-type cartridge valve control assembly; Step 4: Adjust the proportional pressure valve in the pressure-type cover-type cartridge valve control assembly, and collect data from the temperature sensor, pressure sensor, and flow sensor respectively.

6. The servo valve testing method according to claim 2, characterized in that: When a pressure gain test is required: Step 1: Turn on the power switch of the pump station to energize the solenoid valve DT1 in the first directional cover-type cartridge valve control assembly and supply high-pressure hydraulic oil to the test circuit; Step 2: Energize the solenoid valve DT9 in the fourth-direction cover-type cartridge valve control assembly so that the T port of the valve under test is connected to the pressure-type cover-type cartridge valve control assembly; Step 3: Adjust the proportional pressure valve in the pressure-type cover-type cartridge valve control assembly, and collect data from the temperature sensor and pressure sensor respectively.

7. The servo valve testing method according to claim 2, characterized in that: When internal leakage testing is required: Step 1: Turn on the power switch of the pump station to energize the solenoid valve DT1 in the first directional cover-type cartridge valve control assembly and supply high-pressure hydraulic oil to the test circuit; Step 2: Energize the third solenoid directional valve DT7 and the fourth solenoid directional valve DT8 to enable the T port of the valve under test to meet the low flow test conditions. Step 3: Collect data from the temperature sensor, pressure sensor, and flow sensor respectively, and collect internal leakage data of the valve under test.

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