Manually-operated movable servo valve performance test system and test method

Abstract

The invention belongs to the field of servo valve testing, and particularly relates to a manually-operated movable servo valve performance testing system and testing method. The test system comprises a basic performance test unit and a voltage-withstanding performance test unit. The basic performance test unit is used for testing flow performance parameters, pressure performance parameters and internal sealing performance parameters of the electro-hydraulic servo valve; testing of flow performance parameters, pressure performance parameters and internal sealing performance parameters is achieved through different opening and closing combinations of the high-pressure needle valves in the testing units, the flow parameters and the pressure parameters are obtained through the flow meters and the pressure sensors in the units and transmitted to the tester, and then the tester reflects the flow parameters and the pressure parameters in a curve mode through the recorder. Compared with traditional servo valve debugging, a fixed test bench does not need to be built, a test instrument is connected and fixed to the movable test bench through a pipeline and connected with the oil pump through a pipe thread oil port, movable testing is facilitated, an existing pump source can be effectively utilized, the test condition construction cost is greatly reduced, and convenience and simplicity are achieved due to manual operation.

Description

Technical Field

[0001] The invention belongs to the field of servo valve testing, and in particular relates to a manually operated movable servo valve performance testing system and a testing method. Background Art

[0002] At present, 35MPa electro-hydraulic servo valve has gradually become the main trend of airborne electro-hydraulic servo valve. Before the high-pressure electro-hydraulic servo valve is assembled on the machine, it is necessary to complete the flow performance, pressure drop system, pressure performance, sealing performance testing and pressure resistance test to verify whether it meets the performance requirements.

[0003] The performance test of traditional electro-hydraulic servo valves needs to be tested on test systems with different flow levels according to the different flow ranges of the products. Traditional test systems are mostly fixed and complex. Products with different pressure levels and flow ranges require the construction of test systems with different pressure levels and flow ranges. The test systems require a large number of units, occupy a large space, and have high construction costs. The test space requirements are high, and in order to ensure the smooth progress of the test process, other auxiliary safety measures are usually required, which results in high maintenance costs. At the same time, there are also problems such as low utilization of some flow range tests and long testing cycles for batch products. Summary of the invention

[0004] Purpose of the invention: To provide a manually operated movable servo valve performance test system and test method to solve the problems of poor flexibility, high cost and long test cycle of traditional test systems.

[0005] Technical solution: To achieve the above-mentioned purpose, the present invention proposes a manually operated movable servo valve performance test system, the test system comprising a basic performance test unit and a pressure resistance performance test unit;

[0006] The basic performance test unit is used for testing the flow performance parameters, pressure performance parameters, and internal sealing performance parameters of the electro-hydraulic servo valve; the flow performance parameters, pressure performance parameters, and internal sealing performance parameters are tested by testing different opening and closing combinations of the high-pressure needle valves in the unit, and the flow and pressure parameters are obtained through the flow meter and pressure sensor in the unit and transmitted to the tester, which then reflects them in the form of curves through the recorder.

[0007] The pressure resistance performance test unit is used for the pressure resistance performance test of the electro-hydraulic servo valve; through different opening and closing combinations of the high-pressure needle valves in the test unit, the oil inlet pressure test of 1.5 times the rated pressure and the rated pressure oil return pressure test in the pressure resistance performance test are realized.

[0008] Further, the basic performance test unit includes a first test valve block base, and the first test valve block base is provided with four oil circuit interfaces, and the four oil circuit interfaces correspond to the round oil ports distributed on the bottom surface of the electro-hydraulic servo valve to be tested;

[0009] The four oil circuit interfaces are respectively defined as a high-pressure oil inlet P, an oil return port R, a first load port, and a second load port; the high-pressure oil inlet P is connected to a high-pressure oil source through a pipeline, and a first pressure gauge and a high-pressure needle valve K1 are sequentially connected on the pipeline; the oil return port R is connected to the return oil through a pipeline, and a fourth pressure gauge, a high-pressure needle valve K6, a fifth pressure gauge, and an adjustable relief valve are sequentially connected in series on the pipeline from the oil return port R, and a high-pressure needle valve K7, a second flow meter, and a high-pressure needle valve K8 are also connected in parallel between the oil return port R and the inlet of the fifth pressure gauge;

[0010] The first load port is connected to the second load port through a pipeline, and on the pipeline, a high-pressure needle valve K2, a second pressure gauge, a first pressure sensor, a high-pressure needle valve K4, a first flow meter, a high-pressure needle valve K5, a second pressure sensor, a third pressure gauge, and a high-pressure needle valve K3 are connected in series in sequence from the first load port.

[0011] Furthermore, the first pressure sensor and the second pressure sensor both transmit data to the servo valve tester through lines.

[0012] Furthermore, the first flow meter is connected to a first digital display, which can display the output flow of the servo valve in real time.

[0013] Furthermore, the first digital display transmits the data to the servo valve tester through the line.

[0014] Furthermore, the second flow meter is connected to a second digital display, which can display the return oil flow rate of the servo valve during the internal sealing test.

[0015] Furthermore, the pressure resistance performance test unit includes a second test valve block base, on which two oil circuit interfaces are arranged, and the two oil circuit interfaces are respectively defined as a high-pressure oil inlet P and an oil return port R; the two oil circuit interfaces correspond to the oil inlet and return oil ports of the bottom surface distribution circle of the electro-hydraulic servo valve to be tested; the two oil circuit interfaces are respectively connected to the high-pressure and low-pressure oil ports of the movable pressure-resistant oil pump through pipelines; the sixth pressure gauge and the high-pressure needle valve K9 are connected in series in sequence between the high-pressure oil inlet P and the high-pressure oil port of the movable pressure-resistant oil pump; the seventh pressure gauge and the high-pressure needle valve K10 are connected in series in sequence between the oil return port R and the low-pressure oil port of the movable pressure-resistant oil pump.

[0016] Furthermore, the basic performance test unit and the pressure resistance performance test unit are two independent test units and can be integrated on the same test platform.

[0017] Furthermore, the test platform may be equipped with universal wheels to facilitate flexible movement of the platform.

[0018] On the other hand, the present invention also proposes a servo valve performance test method, which adopts the test system designed as above, including flow performance test, pressure performance test, pressure drop test, internal sealing performance test, and pressure resistance performance test of the servo valve;

[0019] Among them, the flow performance test is to install the servo valve on the first test valve block base according to the corresponding relationship between the distribution round ports, open the high-pressure needle valves K1, K2, K3, K4, K5, K6, close the high-pressure needle valves K7, K8, open the external oil source to carry out the test, provide current through the servo valve tester, adjust the adjustable relief valve to the rated return oil pressure, observe the servo valve flow through the first digital display, and read the flow performance parameters through the recorder output flow curve;

[0020] For the pressure drop test, the servo valve is installed on the base of the first test valve block according to the corresponding relationship between the distribution round-through ports, and the high-pressure needle valves K1, K2, K3, K4, K5, and K6 are opened, the high-pressure needle valves K7 and K8 are closed, and the external oil source is turned on to carry out the test. The current is provided by the servo valve tester, the adjustable relief valve is adjusted to the rated return oil pressure, the second pressure sensor line is disconnected, the pressure data is output to the servo valve tester through the first pressure sensor, and the pressure drop performance parameters are read through the pressure curve output by the recorder;

[0021] For the pressure performance test, the servo valve is installed on the base of the first test valve block according to the corresponding relationship between the distribution round-through ports, and the high-pressure needle valves K1, K2, K3, and K6 are opened, and the high-pressure needle valves K4, K5, K7, and K8 are closed, and the external oil source is turned on to carry out the test. The current is provided by the servo valve tester, and the adjustable relief valve is adjusted to set different return oil pressures. The pressure data is output to the servo valve tester through the first pressure sensor and the second pressure sensor, and different pressure curves are output through the recorder to read various parameters of the pressure performance;

[0022] For the internal sealing performance test, the servo valve is installed on the first test valve block base according to the corresponding relationship between the distribution round ports, and the high-pressure needle valves K1, K2, K3, K7, and K8 are opened, and the high-pressure needle valves K4, K5, and K6 are closed, and the external oil source is turned on to carry out the test. The current is provided by the servo valve tester, and the return oil flow of the servo valve is observed by the second digital display to reflect the internal sealing performance of the servo valve;

[0023] For the pressure resistance performance test, the servo valve is installed on the base of the second test valve block according to the corresponding relationship between the distributed round holes, and the high-pressure needle valves K9 and K10 are opened, the movable pressure-resistant oil pump is started, and the pressure is set to 1.5 times the rated pressure. The current is input into the servo valve through the tester for a certain period of time, and the oil leakage on the outer surface of the servo valve is observed; the high-pressure needle valve K9 is opened, the high-pressure needle valve K10 is closed, the movable pressure-resistant oil pump is started, and the pressure is set to the rated pressure for a certain period of time, and the oil leakage on the outer surface of the servo valve is observed.

[0024] Beneficial technical effects: Traditional servo valve testing needs to be carried out on a fixed test bench, which is not only expensive, but also requires the construction of different fixed test systems according to the same pressure level and different flow ranges.

[0025] Compared with traditional servo valve debugging, the high-pressure electro-hydraulic servo valve performance test system and test method proposed in the present invention do not need to build a fixed test bench. The test instruments are fixed on the mobile test bench through pipelines and connected to the oil pump through the pipe threaded oil port, which is convenient for mobile testing and can effectively utilize the existing pump source, greatly reducing the cost of building test conditions. In addition, due to manual operation, it is convenient and simple.

[0026] The test system designed by the present invention can realize performance testing of diverse products with different pressure levels and flow ranges by connecting external oil sources with different pressure levels and flow ranges; to a certain extent, it greatly saves the product testing cycle. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a functional block diagram of the electro-hydraulic servo valve testing system of the present invention. DETAILED DESCRIPTION

[0028] In order to more clearly illustrate the technical solution of the embodiment of the present invention, the present invention is described in detail below in conjunction with the drawings or specific implementation cases of the specification. It should be noted that some (but not all) of the disclosed examples are shown in the drawings. In fact, many different examples can be described and these examples should not be understood as being limited to the examples set forth herein. On the contrary, these examples are described so that the positive effects of the present invention are more reflected, and any parts not detailed in the text are regarded as known techniques or conventional technical means in the art.

[0029] See attached Figure 1 , the present invention specifically designs a manually operated movable servo valve performance test system, the test system is integrated on a movable test workbench, according to the test function requirements, the test system includes a basic performance test unit and a pressure resistance performance test unit;

[0030] Wherein, the basic performance test unit comprises a first test valve block base, on which four oil circuit interfaces are arranged, and the four oil circuit interfaces correspond to the round oil ports distributed on the bottom surface of the electro-hydraulic servo valve to be tested;

[0031] The four oil circuit interfaces are respectively defined as a high-pressure oil inlet P, an oil return port R, a first load port, and a second load port; the high-pressure oil inlet P is connected to a high-pressure oil source through a pipeline, and a first pressure gauge and a high-pressure needle valve K1 are sequentially connected on the pipeline; the oil return port R is connected to the return oil through a pipeline, and a fourth pressure gauge, a high-pressure needle valve K6, a fifth pressure gauge, and an adjustable relief valve are sequentially connected in series on the pipeline from the oil return port R, and a high-pressure needle valve K7, a second flow meter, and a high-pressure needle valve K8 are also connected in parallel between the oil return port R and the inlet of the fifth pressure gauge;

[0032] The first load port is connected to the second load port through a pipeline, and the high-pressure needle valve K2, the second pressure gauge, the first pressure sensor, the high-pressure needle valve K4, the first flow meter, the high-pressure needle valve K5, the second pressure sensor, the third pressure gauge, and the high-pressure needle valve K3 are connected in series in sequence on the pipeline from the first load port;

[0033] The pressure resistance performance test unit includes a second test valve block base, on which two oil circuit interfaces are arranged, and the two oil circuit interfaces are respectively defined as a high-pressure oil inlet P and an oil return port R; the two oil circuit interfaces correspond to the oil inlet and return oil ports of the bottom surface distribution circle of the electro-hydraulic servo valve to be tested; the two oil circuit interfaces are respectively connected to the high-pressure and low-pressure oil ports of the movable pressure-resistant oil pump through pipelines; the sixth pressure gauge and the high-pressure needle valve K9 are connected in series between the high-pressure oil inlet P and the high-pressure oil port of the movable pressure-resistant oil pump; the seventh pressure gauge and the high-pressure needle valve K10 are connected in series between the oil return port R and the low-pressure oil port of the movable pressure-resistant oil pump.

[0034] In the test system specifically designed by the present invention, the high-pressure needle valve K1 plays the role of switching on and off the high-pressure oil inlet. It is opened in the state of basic performance testing of the product and closed in the non-testing state to prevent the high-pressure oil at the oil inlet end from flowing out and polluting the test bench when the servo valve is removed from the base of the first test valve block; the first pressure gauge plays the role of monitoring the oil inlet pressure at the oil inlet P end of the servo valve to ensure that the oil inlet pressure meets the technical index requirements during the test; the second pressure gauge and the third pressure gauge play the role of monitoring the pressure changes at both ends of the load to ensure that the technical index requirements are met; the high-pressure needle valves K2 and K3 are opened in the state of basic performance testing of the product and closed in the non-testing state to prevent the oil from flowing out and polluting the test bench when the servo valve is removed from the base of the first test valve block; the first flow meter plays the role of monitoring the output flow size and flow direction of the servo valve; the first digital display plays the role of intuitively displaying the flow and converting the flow into data output; the first pressure sensor and the second pressure sensor convert the pressure at the load 1 and 2 ends of the servo valve into data output; the high-pressure needle valves K4 and K5 are opened during the flow performance test and closed during the pressure performance test to prevent pressure The performance test is that the oil flows from port 1 to port 2 in series, which affects the accuracy of the pressure performance test; the high-pressure needle valve K6 is opened during the flow performance, pressure performance, and pressure drop performance tests, and is closed during the internal sealing performance test and the servo valve is closed in the non-test state to prevent the oil from flowing back to the servo valve return oil port R during the internal sealing performance test, affecting the accuracy of the internal sealing performance test, and preventing the external oil source from flowing out of the return oil end and contaminating the test bench when the servo valve is removed from the base of the first test valve block during non-testing; the high-pressure needle valves K7 and K8 are only opened in the internal sealing performance test state. Open, and closed in other states to prevent damage to the second flowmeter caused by excessive flow during flow performance testing, and to prevent oil from flowing out of the return oil end of the external oil source and polluting the test bench when the servo valve is removed from the base of the first test valve block when not testing; the second flowmeter monitors the return oil flow of the servo valve; the fourth pressure gauge monitors the return oil port pressure of the servo valve; the fifth pressure gauge monitors the return oil pressure adjusted by the adjustable relief valve; the adjustable relief valve adjusts the return oil pressure, especially for different return oil pressure adjustment requirements during pressure performance testing.

[0035] The high-pressure needle valve K9 should be able to withstand 1.5 times the rated pressure capacity. It should be opened during the pressure resistance performance test and closed when not testing to prevent the high-pressure oil from the movable pressure oil pump from spraying out when the servo valve is removed from the base of the second test valve block during non-testing, causing danger and contaminating the test bench; the sixth pressure gauge should be able to withstand 1.5 times the rated pressure capacity and play a role in monitoring the oil inlet pressure during the pressure resistance performance test; the high-pressure needle valve K10 is opened during the 1.5 times oil inlet pressure test in the pressure resistance performance test and remains closed in other states to prevent the rated return oil pressure test pressure from failing to establish and to prevent the oil from flowing out of the return oil end of the movable pressure oil pump under the test state to contaminate the test bench; the seventh pressure gauge plays a role in monitoring the return oil pressure during the pressure resistance performance test.

[0036] When the servo valve performance test is implemented in the present invention, at least the servo valve flow performance test, pressure performance test, pressure drop test, internal sealing performance test, and pressure resistance performance test are included;

[0037] Among them, the flow performance test is to install the servo valve on the first test valve block base according to the corresponding relationship between the distribution round ports, open the high-pressure needle valves K1, K2, K3, K4, K5, K6, close the high-pressure needle valves K7, K8, open the external oil source to carry out the test, provide current through the servo valve tester, adjust the adjustable relief valve to the rated return oil pressure, observe the servo valve flow through the first digital display, and read the flow performance parameters through the recorder output flow curve;

[0038] For the pressure drop test, the servo valve is installed on the base of the first test valve block according to the corresponding relationship between the distribution round-through ports, and the high-pressure needle valves K1, K2, K3, K4, K5, and K6 are opened, the high-pressure needle valves K7 and K8 are closed, and the external oil source is turned on to carry out the test. The current is provided by the servo valve tester, the adjustable relief valve is adjusted to the rated return oil pressure, the second pressure sensor line is disconnected, the pressure data is output to the servo valve tester through the first pressure sensor, and the pressure drop performance parameters are read through the pressure curve output by the recorder;

[0039] For the pressure performance test, the servo valve is installed on the base of the first test valve block according to the corresponding relationship between the distribution round-through ports, and the high-pressure needle valves K1, K2, K3, and K6 are opened, and the high-pressure needle valves K4, K5, K7, and K8 are closed, and the external oil source is turned on to carry out the test. The current is provided by the servo valve tester, and the adjustable relief valve is adjusted to set different return oil pressures. The pressure data is output to the servo valve tester through the first pressure sensor and the second pressure sensor, and different pressure curves are output through the recorder to read various parameters of the pressure performance;

[0040] For the internal sealing performance test, the servo valve is installed on the first test valve block base according to the corresponding relationship between the distribution round ports, and the high-pressure needle valves K1, K2, K3, K7, and K8 are opened, and the high-pressure needle valves K4, K5, and K6 are closed, and the external oil source is turned on to carry out the test. The current is provided by the servo valve tester, and the return oil flow of the servo valve is observed by the second digital display to reflect the internal sealing performance of the servo valve;

[0041] For the pressure resistance performance test, the servo valve is installed on the base of the second test valve block according to the corresponding relationship between the distributed round holes, and the high-pressure needle valves K9 and K10 are opened, the movable pressure-resistant oil pump is started, and the pressure is set to 1.5 times the rated pressure. The current is input into the servo valve through the tester for a certain period of time, and the oil leakage on the outer surface of the servo valve is observed; the high-pressure needle valve K9 is opened, the high-pressure needle valve K10 is closed, the movable pressure-resistant oil pump is started, and the pressure is set to the rated pressure for a certain period of time, and the oil leakage on the outer surface of the servo valve is observed.

[0042] The working principle of the present invention is as follows: when the servo valve is tested for basic performance other than pressure resistance, the servo valve is installed on the base of the first test valve block, and the pipelines are respectively connected to the high-pressure end and the return oil end of the oil pump truck, and the servo valve various performance test oil circuits are opened and closed by manually switching different combinations of high-pressure needle valves K1 to K10, thereby realizing manual operation tests of basic performances other than pressure resistance; when the servo valve is tested for pressure resistance performance, the servo valve is installed on the base of the second test valve block, the movable pressure-resistant oil pump is turned on, and the pressure resistance performance is manually operated by manually switching different combinations of high-pressure needle valves K1 and K9.

[0043] The above specific implementation methods or cases are only used to explain the technical solutions of the present invention, and are not intended to limit the present application. Any parts not described in detail are deemed to be conventional technical means or common knowledge in the field. It can be understood by ordinary technicians in this field that: based on the design concept of the present application, the technical solutions recorded in the aforementioned implementation methods should be adaptively modified, or some or all of the technical features therein should be replaced by equivalents. These modifications, equivalent replacements, and adaptively improved technical solutions do not depart from the technical essence of the present invention and should all be covered within the protection scope of the present application.

Claims

1. A manually operated movable servo valve performance test system, characterized in that: The test system includes a basic performance test unit and a pressure resistance performance test unit; The basic performance test unit is used to test the flow performance parameters, pressure performance parameters, and internal sealing performance parameters of the electro-hydraulic servo valve; By testing different opening and closing combinations of the high-pressure needle valves in the test unit, the flow performance parameters, pressure performance parameters and internal sealing performance parameters are tested, and the flow and pressure parameters are obtained through the flow meter and pressure sensor in the unit and transmitted to the tester, which then reflects them in the form of curves through the recorder; The pressure resistance performance test unit is used for the pressure resistance performance test of the electro-hydraulic servo valve; through different opening and closing combinations of the high-pressure needle valves in the test unit, the oil inlet pressure test of 1.5 times the rated pressure and the rated pressure oil return pressure test in the pressure resistance performance test are realized.

2. A manually operated movable servo valve performance test system as claimed in claim 1, characterized in that: The basic performance test unit comprises a first test valve block base, on which four oil circuit interfaces are arranged, and the four oil circuit interfaces correspond to the round oil ports distributed on the bottom surface of the electro-hydraulic servo valve to be tested; The four oil circuit interfaces are respectively defined as a high-pressure oil inlet P, an oil return port R, a first load port, and a second load port; the high-pressure oil inlet P is connected to a high-pressure oil source through a pipeline, and a first pressure gauge and a high-pressure needle valve K1 are sequentially connected on the pipeline; the oil return port R is connected to the return oil through a pipeline, and a fourth pressure gauge, a high-pressure needle valve K6, a fifth pressure gauge, and an adjustable relief valve are sequentially connected in series on the pipeline from the oil return port R, and a high-pressure needle valve K7, a second flow meter, and a high-pressure needle valve K8 are also connected in parallel between the oil return port R and the inlet of the fifth pressure gauge; The first load port is connected to the second load port through a pipeline, and on the pipeline, a high-pressure needle valve K2, a second pressure gauge, a first pressure sensor, a high-pressure needle valve K4, a first flow meter, a high-pressure needle valve K5, a second pressure sensor, a third pressure gauge, and a high-pressure needle valve K3 are connected in series in sequence from the first load port.

3. A manually operated movable servo valve performance test system as claimed in claim 2, characterized in that: The first pressure sensor and the second pressure sensor both transmit data to the servo valve tester through lines.

4. A manually operated movable servo valve performance test system as claimed in claim 2, characterized in that: The first flow meter is connected with a first digital display, which can display the output flow of the servo valve in real time; the first digital display transmits data to the servo valve tester through the line.

5. A manually operated movable servo valve performance test system as claimed in claim 2, characterized in that: The second flow meter is connected to a second digital display, which can display the return oil flow of the servo valve during the internal sealing test.

6. A manually operated movable servo valve performance test system as claimed in claim 1, characterized in that: The pressure resistance performance test unit includes a second test valve block base, on which two oil circuit interfaces are arranged, and the two oil circuit interfaces are respectively defined as a high-pressure oil inlet P and an oil return port R; the two oil circuit interfaces correspond to the oil inlet and return oil ports of the bottom surface distribution circle of the electro-hydraulic servo valve to be tested; the two oil circuit interfaces are respectively connected to the high-pressure and low-pressure oil ports of the movable pressure-resistant oil pump through pipelines; the sixth pressure gauge and the high-pressure needle valve K9 are connected in series in sequence between the high-pressure oil inlet P and the high-pressure oil port of the movable pressure-resistant oil pump; the seventh pressure gauge and the high-pressure needle valve K10 are connected in series in sequence between the oil return port R and the low-pressure oil port of the movable pressure-resistant oil pump.

7. A manually operated movable servo valve performance test system as claimed in claim 1, characterized in that: The basic performance test unit and the pressure resistance performance test unit are two independent test units that can be integrated on the same test platform.

8. A manually operated movable servo valve performance test system as claimed in claim 7, characterized in that: The test platform can also be equipped with universal wheels to facilitate the flexible movement of the platform.

9. A servo valve performance testing method, the testing method adopts the testing system designed as above, characterized in that: Including servo valve flow performance test, pressure performance test, pressure drop test, internal sealing performance test, and pressure resistance test; Among them, the flow performance test is to install the servo valve on the first test valve block base according to the corresponding relationship between the distribution round ports, open the high-pressure needle valves K1, K2, K3, K4, K5, K6, close the high-pressure needle valves K7, K8, open the external oil source to carry out the test, provide current through the servo valve tester, adjust the adjustable relief valve to the rated return oil pressure, observe the servo valve flow through the first digital display, and read the flow performance parameters through the recorder output flow curve; For the pressure drop test, the servo valve is installed on the base of the first test valve block according to the corresponding relationship between the distribution round-through ports, and the high-pressure needle valves K1, K2, K3, K4, K5, and K6 are opened, the high-pressure needle valves K7 and K8 are closed, and the external oil source is turned on to carry out the test. The current is provided by the servo valve tester, the adjustable relief valve is adjusted to the rated return oil pressure, the second pressure sensor line is disconnected, the pressure data is output to the servo valve tester through the first pressure sensor, and the pressure drop performance parameters are read through the pressure curve output by the recorder; For the pressure performance test, the servo valve is installed on the base of the first test valve block according to the corresponding relationship between the distribution round-through ports, and the high-pressure needle valves K1, K2, K3, and K6 are opened, and the high-pressure needle valves K4, K5, K7, and K8 are closed, and the external oil source is turned on to carry out the test. The current is provided by the servo valve tester, and the adjustable relief valve is adjusted to set different return oil pressures. The pressure data is output to the servo valve tester through the first pressure sensor and the second pressure sensor, and different pressure curves are output through the recorder to read various parameters of the pressure performance; For the internal sealing performance test, the servo valve is installed on the first test valve block base according to the corresponding relationship between the distribution round ports, and the high-pressure needle valves K1, K2, K3, K7, and K8 are opened, and the high-pressure needle valves K4, K5, and K6 are closed, and the external oil source is turned on to carry out the test. The current is provided by the servo valve tester, and the return oil flow of the servo valve is observed by the second digital display to reflect the internal sealing performance of the servo valve; For the pressure resistance performance test, the servo valve is installed on the base of the second test valve block according to the corresponding relationship between the distributed round holes, and the high-pressure needle valves K9 and K10 are opened, the movable pressure-resistant oil pump is started, and the pressure is set to 1.5 times the rated pressure. The current is input into the servo valve through the tester for a certain period of time, and the oil leakage on the outer surface of the servo valve is observed; the high-pressure needle valve K9 is opened, the high-pressure needle valve K10 is closed, the movable pressure-resistant oil pump is started, and the pressure is set to the rated pressure for a certain period of time, and the oil leakage on the outer surface of the servo valve is observed.

Images