A hydraulic control valve test system and method

Abstract

The application provides a hydraulic control valve test system and method, comprising a hydraulic pump station system for providing hydraulic power during a test process; the hydraulic pump station system comprises an oil tank system, the oil tank system is connected with a first main pump motor set system and a second main pump motor set system in parallel, the first main pump motor set system is used for providing hydraulic power for a first test system, and the second main pump motor set system is used for providing hydraulic power for a second test system; a control pump motor set system is connected to the oil tank system and is used for providing hydraulic power for a third test system; the first test system, the second test system and the third test system are connected with a control valve test bench system used for testing a valve to be tested; the valve to be tested comprises a flow valve, a balance valve, a pressure reducing valve and a relief valve.

Description

Technical Field

[0001] The present invention relates to the technical field of performance detection of hydraulic systems in hydropower stations, and in particular to a hydraulic control valve test system and method. Background Art

[0002] The hydraulic system of a hydropower station is an important power unit and control unit for opening and closing the gates of the hydropower station. The hydraulic control valve is the smallest unit of the hydraulic system. Its quality directly determines the safety and reliability of the hydraulic system itself. Therefore, understanding the performance indicators of different valve groups and performing performance testing on different valves can greatly assist equipment management departments in understanding the status of the hydraulic control valves and then carrying out planned inspection and maintenance work.

[0003] Currently, maintenance personnel rely solely on experience to judge valve failures and performance, or determine whether a valve is normal after installation based on whether it meets on-site operating conditions. Without specific data analysis, they cannot determine whether a newly purchased valve has problems. There is also no quantitative data to support the actual performance of the old valve after removal. Summary of the Invention

[0004] Based on the deficiencies in the above-mentioned prior art, the technical problem to be solved by the present invention is to provide a hydraulic control valve test system and method. This system takes the test and inspection of flow valves, balancing valves, pressure reducing valves and overflow valves used in power stations as the starting point, and invents a hydraulic control valve test bench. Through this test platform, different functions of different valves can be tested, including the steady-state flow-pressure characteristics, output flow-input signal characteristics test, and pressure step of the flow valve; the action performance, internal leakage, working range, step response, and minimum stable flow of the balancing valve; the steady-state pressure-flow characteristics and flow step pressure response characteristics of the overflow valve; the steady-state pressure-flow characteristics and pressure step response of the pressure reducing valve, and other parameters. Different valves can be tested on a test platform, which is helpful to understand whether the evaluation of old valves and the performance of newly purchased valves meet on-site requirements and quality assessments, and greatly assists the maintenance and repair of hydraulic equipment.

[0005] In order to achieve the above technical features, the object of the present invention is achieved as follows: a hydraulic control valve test system includes a hydraulic pump station system for providing hydraulic power during the test process;

[0006] The hydraulic pump station system includes an oil tank system, to which a first main pump-motor system and a second main pump-motor system are connected in parallel. The first main pump-motor system is used to provide hydraulic power for the first test system, and the second main pump-motor system is used to provide hydraulic power for the second test system; the oil tank system is connected to a control pump-motor system, which is used to provide hydraulic power for the third test system;

[0007] The first test system, the second test system and the third test system are connected to a control valve test bench system for testing the valve to be tested;

[0008] The valves to be tested include a flow valve, a balancing valve, a pressure reducing valve, and a relief valve.

[0009] Preferably, the entire hydraulic pump station system is arranged inside the valve station pump station room;

[0010] The oil tank system includes a main oil tank, which is equipped with multiple oil drain ball valves, multiple groups of heaters are arranged inside the main oil tank, and the main oil tank is also equipped with a liquid level sensor, a visual liquid level gauge, a temperature sensor, an oil return filter, an oil filling filter and an oil sampling ball valve.

[0011] Preferably, the main oil tank is connected to a cooling circulation device for cooling the oil, and the cooling circulation device includes a switch signaling ball valve connected to the main oil tank, the switch signaling ball valve is connected to the cooling pump motor unit through a first flexible joint, the outlet of the cooling pump motor unit is connected to the cooler through a first one-way valve, the outlet of the cooler is connected in parallel with a first ball valve, and the first ball valve is connected to the main oil tank through a filter.

[0012] Preferably, the cooler adopts a plate cooler, which is connected to a water inlet ball valve for cooling water to enter, an electromagnetic water valve is installed on the pipeline after the water inlet ball valve, and the cooling water outlet of the cooler is connected to a water outlet ball valve.

[0013] Preferably, the first main pump motor group system includes a first oil suction ball valve connected to the main oil tank, the first oil suction ball valve is connected to the first pump group through a second flexible joint, the oil outlet of the first pump group is connected to the first high-pressure filter, and the first high-pressure filter is connected to the first test system through the second one-way valve and the first outlet ball valve in turn; a first seismic-resistant pressure gauge and a first electromagnetic overflow valve are installed on the pipeline between the first high-pressure filter and the second one-way valve; a first proportional overflow valve, a first pressure sensor and a connecting ball valve are installed on the pipeline between the second one-way valve and the first outlet ball valve, and the other end of the connecting ball valve is connected to the second test system.

[0014] Preferably, the second main pump motor group system includes a second oil suction ball valve connected to the main oil tank, the second oil suction ball valve is connected to the second pump group through a third flexible joint, the oil outlet of the second pump group is connected to the second high-pressure filter, and the second high-pressure filter is connected to the second test system through a third one-way valve and a second outlet ball valve in turn; a second seismic-resistant pressure gauge and a second electromagnetic overflow valve are installed on the pipeline between the second high-pressure filter and the third one-way valve; the pipeline between the third one-way valve and the second outlet ball valve is connected to the connecting ball valve and is installed with a second pressure sensor.

[0015] Preferably, the control pump motor group system comprises a third oil suction ball valve connected to the main oil tank, the third oil suction ball valve is connected to a third pump group through a fourth flexible joint, an oil outlet of the third pump group is connected to a third high-pressure filter, the third high-pressure filter is connected to a third test system through a fourth one-way valve and a third outlet ball valve in sequence; a third shock resistance pressure gauge and a third electromagnetic overflow valve are installed on a pipeline between the third pump group and the third high-pressure filter; a second proportional overflow valve and a third pressure sensor are installed on a pipeline between the fourth one-way valve and the third outlet ball valve.

[0016] Preferably, the first pump group adopts a constant pressure variable plunger pump and is connected to a first driving motor to provide pump oil power.

[0017] The second pump group adopts a constant pressure variable plunger pump and is connected to a second driving motor to provide pump oil power.

[0018] The third pump group adopts a constant pressure variable pump and is connected to a third driving motor to provide pump oil power.

[0019] Preferably, the control valve test bench system is arranged in a valve test laboratory, and the valve test laboratory is connected to a valve test pump station room through a hydraulic pipeline.

[0020] The control valve test bench system comprises a second ball valve connected to a first test system port, and a pipeline after the second ball valve is connected to an A oil port of a valve to be tested through a sixth ball valve.

[0021] The control valve test bench system further comprises a third ball valve connected to a second test system port, and a pipeline after the third ball valve is connected to the A oil port of the valve to be tested through a seventh ball valve.

[0022] The control valve test bench system further comprises a fourth ball valve connected to a third test system port, and the fourth ball valve is connected to an X oil port of the valve to be tested.

[0023] A pipeline between the second ball valve and the sixth ball valve is connected with a bypass flow adjusting assembly and a sixteenth ball valve, and a pipeline after the sixteenth ball valve is connected to a B2 oil port of the valve to be tested through a second flow meter, a fourteenth ball valve and a twelfth ball valve in sequence.

[0024] The A oil port of the valve to be tested is connected to the seventh ball valve, the seventh ball valve is connected with an eighth ball valve and a ninth ball valve, the eighth ball valve is connected to a B1 oil port of the valve to be tested through a fifteenth ball valve, a first flow meter, a thirteenth ball valve and an eleventh ball valve, and the ninth ball valve is connected to an oil return pipeline.

[0025] The B3 oil port of the valve to be tested is connected to the ninth ball valve and the eighth ball valve, and the ninth ball valve is connected to the eleventh ball valve and the twelfth ball valve.

[0026] The B1 oil port of the valve to be tested is connected to a tenth ball valve, and the tenth ball valve is connected to a B2 oil port of the valve to be tested through a throttling loading assembly and an eighteenth ball valve.

[0027] The Y oil port of the valve to be tested is connected to the oil tank through the fifth ball valve.

[0028] Preferably, the bypass flow regulating assembly includes a third proportional throttle valve and an electromagnetic reversing valve connected in parallel, and the other ports of the third proportional throttle valve and the electromagnetic reversing valve are connected to the oil return pipeline.

[0029] Preferably, the throttle loading assembly includes a first proportional throttle valve, a second proportional throttle valve, a first electromagnetic reversing valve and a seventeenth ball valve connected in parallel.

[0030] On the other hand, the present invention provides a method for performing a performance test of a valve to be tested using the hydraulic control valve test system, including a proportional flow valve test method:

[0031] Output flow-input signal characteristic test:

[0032] Step 1.1, open the second ball valve, the sixth ball valve, the eleventh ball valve, the thirteenth ball valve, and the fifteenth ball valve;

[0033] Step 1.2: Open the first outlet ball valve, close the connecting ball valve and the second outlet ball valve, start the first pump group, and the main pump supplies oil to the first test system. The test pressure is adjusted by the first proportional relief valve, and the test flow is adjusted by the third proportional throttle valve.

[0034] In step 1.3, the pressurized oil enters the A port of the proportional flow valve under test through the first outlet ball valve, the second ball valve, and the sixth ball valve. Within its rated signal range, a periodic signal is input to the proportional flow valve under test. The B port of the proportional flow valve, i.e., the outlet, is then returned to the return port T through the eleventh ball valve, the thirteenth ball valve, the first flowmeter, and the fifteenth ball valve. The oil then flows back to the oil tank through the T port. By collecting the flow signal of the first flowmeter, a curve is drawn with the percentage of the given proportional flow valve signal as the X-axis and the flow signal of the first flowmeter as the Y-axis, thereby measuring the output flow-input signal characteristic.

[0035] Steady-state flow-pressure characteristic test:

[0036] The test circuit is consistent with the output flow-input signal characteristic test circuit. A constant value signal is input to the proportional flow valve under test. Under specified increments of inlet and outlet pressures, the test pressure is adjusted by adjusting the first proportional relief valve. A curve is plotted with the pressure drop as the X-axis and the flow signal as the Y-axis to measure the steady-state flow-pressure characteristic. The pressure drop is: pP-pL-pT, where pP is the test pressure set by the first proportional relief valve, pL=|pA-pB|, pA is the inlet pressure of the proportional flow valve under test, pB is the outlet pressure of the proportional flow valve under test, and pT is the pressure at the oil return port T.

[0037] Transient characteristic test of flow control valve with pressure compensation:

[0038] Step 2.1, open the second ball valve, the sixth ball valve, the tenth ball valve, the eighteenth ball valve, the twelfth ball valve, the thirteenth ball valve, the fifteenth ball valve;

[0039] Step 2.2, open the first outlet ball valve, close the communication ball valve, the second outlet ball valve, start the first pump group, adjust the first proportional overflow valve to set the test pressure, adjust the third proportional throttle valve to set the test flow rate;

[0040] Step 2.3, first close the first electromagnetic reversing valve, input a certain constant signal to the test flow valve, adjust the first proportional throttle valve, read the steady-state set flow rate and the pressure difference caused by the first proportional throttle valve;

[0041] Step 2.4, open the first electromagnetic reversing valve, adjust the second proportional throttle valve, read the pressure difference caused by the parallel oil way of the first proportional throttle valve and the second proportional throttle valve;

[0042] Step 2.5, quickly close the first electromagnetic reversing valve, cause the outlet pressure step, get the instantaneous flow rate by the indirect method or the direct method, draw the pressure step flow rate response characteristic curve, and thus detect the transient characteristics of the test flow valve.

[0043] Preferably, the test method comprises a balance valve test method:

[0044] Action performance test:

[0045] Step 3.1, open the third ball valve, the sixth ball valve, the twelfth ball valve, the thirteenth ball valve, the fifteenth ball valve, the fifth ball valve;

[0046] Step 3.2, open the communication ball valve, the second outlet ball valve, the third outlet ball valve, close the first outlet ball valve, start the first pump group, adjust the first proportional overflow valve to set the test pressure, adjust the third proportional throttle valve to set the test flow rate;

[0047] Step 3.3, the pressure oil of the second test system enters the A oil port of the balance valve through the third ball valve and the sixth ball valve, the oil liquid flows forward through the one-way valve, flows out from the B oil port of the balance valve, and flows back to the oil tank through the twelfth ball valve, the thirteenth ball valve, the first flowmeter and the fifteenth ball valve, at this time, the balance valve oil way is from the A oil port to the B oil port;

[0048] Step 3.4, close the sixth ball valve and the fifteenth ball valve, open the seventh ball valve, the eighth ball valve and the sixteenth ball valve, start the first pump group, adjust the first proportional overflow valve to set the test pressure, adjust the third proportional throttle valve to set the test flow rate;

[0049] Step 3.5, open the third outlet ball valve and the fourth ball valve, start the third pump group, and the balance valve control oil pressure is adjusted by the second proportional overflow valve;

[0050] In step 3.6, the pressure oil of the second test system flows through the third ball valve, the sixteenth ball valve, the first flowmeter, the thirteenth ball valve, and the twelfth ball valve into port B of the balancing valve. Simultaneously, the outlet oil of the third test system is controlled to flow through the third outlet ball valve and the fourth ball valve to provide control oil to port X of the balancing valve. Adjust the second proportional relief valve to gradually increase the control oil pressure Px from zero within the rated range of the test valve. When PB drops to 0.8 and 0.1 times the nominal pressure, the PX value is read as the control pressure variation range.

[0051] Step 3.7, under the two oil circuit states, the operating performance is tested by the positive and negative values ​​indicated by the first flow meter;

[0052] Internal leakage test:

[0053] Step 4.1: Open the third, sixteenth, fourteenth, twelfth, seventh, eighth, and fifth ball valves, and close the remaining valves. The balancing valve oil route flows from port B to port A.

[0054] Step 4.2: Open the connecting ball valve and the second outlet ball valve, close the first outlet ball valve, start the first pump group, adjust the first proportional relief valve to set the test pressure, and adjust the third proportional throttle valve to set the test flow rate;

[0055] Step 4.3: Maintain the pressure for at least 5 minutes and detect the internal leakage using a second flow meter;

[0056] In step 4.4, open the third outlet ball valve, the fourth ball valve, the ninth ball valve, and the fifteenth ball valve, close the sixteenth ball valve, the twelfth ball valve, the third ball valve, and the eighth ball valve, start the third pump group, adjust the second proportional relief valve to make the control oil pressure Px 0.5 times the nominal pressure, maintain the pressure for at least 2 minutes, and detect the internal leakage using the second flow meter.

[0057] Preferably, the balancing valve test method further comprises:

[0058] Working range test:

[0059] Step 5.1: Close the sixth ball valve, open the third, sixteenth, thirteenth, twelfth, seventh, fifth, and eighth ball valves, and route the balancing valve oil from port B to port A.

[0060] Step 5.2: Open the connecting ball valve and the second outlet ball valve, close the first outlet ball valve, start the first pump group, adjust the first proportional relief valve to set the test pressure, and adjust the third proportional throttle valve to set the test flow rate;

[0061] Step 5.3: Open the third outlet ball valve and the fourth ball valve, start the third pump group, and control the oil pressure of the balancing valve to be regulated by the second proportional relief valve;

[0062] Step 5.4: Adjust the second proportional relief valve so that the control oil pressure Px gradually increases at the nominal flow rate, 0.25 times the nominal flow rate, and 0.08 times the nominal flow rate, respectively. Draw a working range curve with pressure PB as the X-axis and Px as the Y-axis.

[0063] Step response test:

[0064] Step 6.1: Close the sixth ball valve, open the third, sixteenth, thirteenth, seventh, fifth, and eighth ball valves, and route the balancing valve oil from port B to port A.

[0065] Step 6.2: Open the connecting ball valve and the second outlet ball valve, close the first outlet ball valve, start the first pump group, adjust the first proportional relief valve to set the test pressure, and adjust the third proportional throttle valve to set the test flow rate;

[0066] Step 6.3: Open the third outlet ball valve and the fourth ball valve, start the third pump group, and control the oil pressure of the balancing valve to be regulated by the second proportional relief valve;

[0067] Step 6.4: Within the rated signal range, adjust the second proportional relief valve to set the control oil pressure, quickly close the second solenoid reversing valve, generate a flow step, and draw a step response characteristic curve based on the valve inlet pressure and valve core displacement;

[0068] Minimum stable flow test:

[0069] Step 7.1: Close the sixth ball valve, open the third, sixteenth, thirteenth, seventh, fifth, and eighth ball valves, and route the balancing valve oil from port B to port A.

[0070] Step 7.2: Open the connecting ball valve and the second outlet ball valve, close the first outlet ball valve, start the first pump group, adjust the first proportional relief valve to set the test pressure, and adjust the third proportional throttle valve to set the test flow rate;

[0071] Step 7.3: Open the third outlet ball valve and the fourth ball valve, start the third pump group, and adjust the oil pressure of the balancing valve to the second proportional relief valve;

[0072] Step 7.4: Change the flow rate of the hydraulic pump and repeat the transient characteristic test until the minimum stable flow rate is obtained. Observe the first flowmeter until the displayed value stabilizes to one decimal place, thereby detecting its minimum stable flow rate.

[0073] In another aspect, the present invention provides a method for performing a performance test on a valve to be tested using the hydraulic control valve test system, including a relief valve test method:

[0074] Steady-state pressure-flow characteristic test:

[0075] Step 8.1, open the second ball valve, the sixth ball valve, the ninth ball valve, the thirteenth ball valve, the fifteenth ball valve, and the fifth ball valve;

[0076] Step 8.2: Open the first outlet ball valve, close the connecting ball valve and the second outlet ball valve, start the first pump group, and adjust the first proportional relief valve to set the test pressure;

[0077] Step 8.3: Open the third outlet ball valve and the fourth ball valve, start the third pump group, and adjust the relief valve control oil pressure by the second proportional relief valve. Adjust the second proportional relief valve to set the pilot control oil pressure, and adjust the third proportional throttle valve to fully open the valve port for diversion.

[0078] In step 8.4, the test relief valve is adjusted to a predetermined pressure value. At each test pressure value, the flow rate of the test relief valve is increased from zero to the maximum value and then decreased from the maximum value to the minimum value by adjusting the third proportional throttle valve, and its steady-state pressure-flow characteristic is measured.

[0079] Flow step pressure response characteristic test:

[0080] Step 9.1, open the second ball valve, the sixth ball valve, the ninth ball valve, the thirteenth ball valve, the fifteenth ball valve, and the fifth ball valve;

[0081] Step 9.2: Open the first outlet ball valve, close the connecting ball valve and the second outlet ball valve, start the first pump group, and adjust the first proportional relief valve to set the test pressure;

[0082] Step 9.3: Open the third outlet ball valve and the fourth ball valve, start the third pump group, and adjust the relief valve control oil pressure by the second proportional relief valve. Adjust the second proportional relief valve to set the pilot control oil pressure. Adjust the third proportional throttle valve to reduce the test pressure to the starting pressure. Ensure that the starting pressure at the test valve port is no more than 20% of the final steady-state pressure value.

[0083] Step 9.4: Quickly close the second electromagnetic reversing valve to generate a pressure gradient in the closed circuit. By detecting the inlet pressure, its pressure response characteristics are measured.

[0084] Preferably, the pressure reducing valve test method includes:

[0085] Steady-state pressure-flow characteristic test:

[0086] Step 10.1, open the second ball valve, the sixth ball valve, the tenth ball valve, the seventeenth ball valve, the eighteenth ball valve, the twelfth ball valve, the thirteenth ball valve, the fifteenth ball valve, and the fifth ball valve;

[0087] Step 10.2: Open the first outlet ball valve, close the connecting ball valve and the second outlet ball valve, start the first pump group, and adjust the first proportional relief valve to set the test pressure;

[0088] Step 10.3: Open the third outlet ball valve and the fourth ball valve, start the third pump group, set the pilot control oil pressure on the second proportional relief valve, and adjust the third proportional throttle valve to fully open the valve port for diversion;

[0089] Step 10.4, close the first proportional throttle valve and adjust the second proportional throttle valve to a certain opening;

[0090] In step 10.5, the pressure reducing valve under test is set to the required test flow and outlet pressure values, including the maximum and minimum pressure values ​​of the valve. At each test pressure value, the flow of the pressure reducing valve under test is increased from zero to the maximum value, and then decreased from the maximum value to the minimum value by adjusting the third proportional throttle valve, and its steady-state pressure-flow characteristic is measured. During the test, the inlet pressure of the valve under test should be kept stable at the rated pressure value.

[0091] Inlet pressure step pressure response characteristic test:

[0092] Step 11.1, open the second ball valve, the sixth ball valve, the tenth ball valve, the seventeenth ball valve, the eighteenth ball valve, the twelfth ball valve, the thirteenth ball valve, the fifteenth ball valve, and the fifth ball valve;

[0093] Step 11.2: Open the first outlet ball valve, close the connecting ball valve and the second outlet ball valve, start the first pump group, and adjust the first proportional relief valve to set the test pressure;

[0094] Step 11.3: Open the third outlet ball valve and the fourth ball valve, start the third pump group, adjust the second proportional relief valve to set the pilot control oil pressure, and adjust the third proportional throttle valve to reduce the test pressure to the starting pressure. To ensure the full opening of the valve core of the test valve, ensure that this starting pressure does not exceed 50% of the test valve outlet pressure value and 20% of the set inlet pressure value of the test valve;

[0095] Step 11.4, closing the first proportional throttle valve and the second proportional throttle valve;

[0096] Step 11.5: Quickly close the second electromagnetic reversing valve to cause a pressure step at the inlet of the test valve, and measure its pressure response characteristics through the change in the valve outlet pressure;

[0097] Outlet flow rate step pressure response characteristic test:

[0098] Step 12.1, open the second ball valve, the sixth ball valve, the tenth ball valve, the eighteenth ball valve, the twelfth ball valve, the thirteenth ball valve, the fifteenth ball valve, and the fifth ball valve;

[0099] Step 12.2: Open the first outlet ball valve, close the connecting ball valve and the second outlet ball valve, start the first pump group, and adjust the first proportional relief valve to set the test pressure;

[0100] Step 12.3: Open the third outlet ball valve and the fourth ball valve, start the third pump group, adjust the second proportional relief valve to set the pilot control oil pressure, and adjust the third proportional throttle valve to set the test flow rate;

[0101] Step 12.4, closing the first proportional throttle valve and the second proportional throttle valve;

[0102] Step 12.5: Adjust the test valve and the second proportional throttle valve so that the flow rate and outlet pressure of the test valve are set to the required test values, and close the first electromagnetic reversing valve so that the outlet flow rate of the test valve is zero;

[0103] In step 12.6, the first electromagnetic reversing valve is opened quickly to generate a flow step change in the outlet circuit of the test valve, and its pressure response characteristics are measured through the change in the valve outlet pressure.

[0104] The present invention has the following beneficial effects:

[0105] 1. The test system of the present invention can test flow valves, balancing valves, pressure reducing valves, and relief valves. The different functions of different valves include the steady-state flow-pressure characteristics, output flow-input signal characteristics test, and pressure step of the flow valve; the action performance, internal leakage, working range, step response, and minimum stable flow of the balancing valve; the steady-state pressure-flow characteristics and flow step pressure response characteristics of the relief valve; the steady-state pressure-flow characteristics and pressure step response of the pressure reducing valve. Different valves can be tested on a test platform, which is helpful for understanding the evaluation of old valves and whether the performance of newly purchased valves meets on-site requirements and quality assessment, and greatly assists in the maintenance and repair of hydraulic equipment.

[0106] 2. The above-mentioned oil tank system can be used to provide hydraulic oil during the test process.

[0107] 3. The cooling circulation device can be used to circulate and cool the hydraulic oil during the test, thereby ensuring the performance of the hydraulic oil.

[0108] 4. The above-mentioned cooler can ensure the best cooling effect.

[0109] 5. The first main pump-motor system can be used to provide the required hydraulic power during the test.

[0110] 6. Through the above system, when the oil supply flow of the first main pump-motor group system does not meet the oil demand of the first test system, the second outlet ball valve of the second main pump-motor group system can be closed, and the connecting ball valve 61.2 can be opened to start the first main pump-motor group system and the second main pump-motor group system respectively to supply oil to the first test system. Similarly, when the oil supply flow of the second main pump-motor group system does not meet the oil demand of the second test system, the first outlet ball valve of the first pump group can be closed, and the connecting ball valve 61.2 can be opened to start the first main pump-motor group system and the second main pump-motor group system respectively to supply oil to system P2.

[0111] 7. Using the above system, if the first main pump-motor system fails, the second outlet ball valve of the second main pump-motor system can be closed, the connecting ball valve can be opened, and the second main pump-motor system can be started to supply oil to the first test system. Similarly, if the second main pump-motor system fails, the first outlet ball valve of the first main pump-motor system can be closed, the connecting ball valve can be opened, and the first main pump-motor system can be started to supply oil to the second test system. BRIEF DESCRIPTION OF THE DRAWINGS

[0112] The present invention will be further described below with reference to the accompanying drawings and examples.

[0113] Figure 1 This is the hydraulic pump station system of the present invention.

[0114] Figure 2 This is the hydraulic control valve test bench system of the present invention.

[0115] In the figure: first test system P1, second test system P2, third test system P3;

[0116] Main oil tank 43, oil drain ball valve 42, heater 28, liquid level sensor 25, visual level gauge 23, temperature sensor 27, return oil filter 92, oil filling filter 30, oil sampling ball valve 91;

[0117] Ball valve with switch signal 90, first flexible joint 89, cooling pump motor unit 07.2, first check valve 66, cooler 29, first ball valve 96, filter 32;

[0118] Water inlet ball valve 71.1, electromagnetic water valve 72, water outlet ball valve 71.2;

[0119] First oil suction ball valve 21.1, second flexible joint 19.1, first pump assembly 01.1, first high-pressure filter 33.1, second one-way valve 69.1, first outlet ball valve 61.1, first test system P1, first seismic-resistant pressure gauge 47.1, first electromagnetic relief valve 87.1, first proportional relief valve 75, first pressure sensor 50.1, connecting ball valve 61.2, second test system P2;

[0120] Second oil suction ball valve 21.2, third flexible joint 19.2, second pump group 01.2, second high pressure filter 33.2, third one-way valve 69.2, second outlet ball valve 61.3, second shock-proof pressure gauge 47.2, second electromagnetic overflow valve 87.2, second pressure sensor 50.2;

[0121] Third oil suction ball valve 22.1, fourth flexible joint 20.1, third pump group 02, third high pressure filter 34, fourth one-way valve 70.1, third outlet ball valve 62.1, third shock-proof pressure gauge 47.3, third electromagnetic overflow valve 87.3, second proportional overflow valve 76, third pressure sensor 50.3;

[0122] First accumulator 37, second accumulator 38, first safety cut-off valve group 39, second safety cut-off valve group 40;

[0123] Second ball valve 60.9, third ball valve 60.10, fourth ball valve 63.4, fifth ball valve 59.1, sixth ball valve 60.11, seventh ball valve 60.12, eighth ball valve 41.1, ninth ball valve 41.2, tenth ball valve 60.4, eleventh ball valve 60.6, twelfth ball valve 60.7, thirteenth ball valve 60.8, fourteenth ball valve 59.3, fifteenth ball valve 60.3, sixteenth ball valve 60.2, seventeenth ball valve 60.1, eighteenth ball valve 60.5;

[0124] First flow meter 73, second flow meter 74;

[0125] First proportional throttle valve 78.1, second proportional throttle valve 78.2, third proportional throttle valve 78.3;

[0126] First electromagnetic reversing valve 79.1, second electromagnetic reversing valve 79.2. DETAILED DESCRIPTION

[0127] The technical solutions in the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present application.

[0128] Embodiment 1:

[0129] As Figure 1-2As shown, a hydraulic control valve test system, a hydraulic control valve test system, includes a hydraulic pump station system for providing hydraulic power during the test process; the hydraulic pump station system includes an oil tank system, and the oil tank system is connected in parallel with a first main pump motor group system and a second main pump motor group system, the first main pump motor group system is used to provide hydraulic power for the first test system P1, and the second main pump motor group system is used to provide hydraulic power for the second test system P2; the oil tank system is connected to a control pump motor group system, and the control pump motor group system is used to provide hydraulic power for the third test system P3; the first test system P1, the second test system P2 and the third test system P3 are connected to a control valve test bench system for testing the valve to be tested; the valve to be tested includes a flow valve, a balancing valve, a pressure reducing valve and an overflow valve. By adopting the above-mentioned hydraulic directional valve test system, different functions of different valves can be tested, including internal leakage test and steady-state pressure difference-flow characteristic test of solenoid reversing valves and solenoid ball valves; internal leakage test, output flow-input signal characteristic test, threshold characteristic test, throttling adjustment characteristic test, output flow-load pressure difference characteristic test, output flow-valve pressure drop characteristic test, limit power characteristic test, pressure zero drift, fault protection function test, dynamic test and other parameters of servo valves and proportional valves. Different valves can be tested on each test platform, which is helpful to understand whether the performance of old valves and newly purchased valves meet on-site requirements and quality assessment, and greatly assists the maintenance and repair of hydraulic equipment.

[0130] Furthermore, the entire hydraulic pump station system is located inside the valve station pump station room. The oil tank system includes a main oil tank 43, which is equipped with multiple oil drain ball valves 42. Multiple sets of heaters 28 are installed inside the main oil tank 43. The main oil tank 43 is also equipped with a liquid level sensor 25, a visual level gauge 23, a temperature sensor 27, a return oil filter 92, an oil injection filter 30, and an oil sampling ball valve 91. The above-mentioned oil tank system can be used to provide hydraulic oil during the test process.

[0131] Furthermore, the main oil tank 43 is connected to a cooling circulation device for cooling the hydraulic fluid. This cooling circulation device includes a ball valve 90 with a switch signaling function connected to the main oil tank 43. This ball valve 90 is connected to the cooling pump motor unit 07.2 via a first flexible joint 89. The outlet of the cooling pump motor unit 07.2 is connected to the cooler 29 via a first check valve 66. The outlet of the cooler 29 is connected in parallel to a first ball valve 96, which is then connected to the main oil tank 43 via a filter 32. This cooling circulation device can be used to circulate and cool the hydraulic fluid during testing, thereby ensuring the hydraulic fluid's performance. Specifically, the cooling circulation device operates as follows: When the cooling pump motor unit 07.2 is activated, the fluid enters the cooler through the ball valve 90 with a switch signaling function, the first flexible joint 89, and the first check valve 66. The inlet ball valve 71.1 connects to the cooling water inlet, and the outlet ball valve 71.2 connects to the cooling water outlet. The oil and cooling water complete heat exchange in the cooler, and finally, the oil flows back to the oil tank through the first ball valve 96 and the filter 32.

[0132] Furthermore, the cooler 29 is a plate-type cooler, connected to a water inlet ball valve 71.1 for cooling water to enter, a solenoid water valve 72 installed on the pipeline after the water inlet ball valve 71.1, and a water outlet ball valve 71.2 connected to the cooling water outlet of the cooler 29. The above-mentioned cooler 29 can ensure an optimal cooling effect.

[0133] Furthermore, the first main pump-motor system includes a first oil suction ball valve 21.1 connected to the main oil tank 43. The first oil suction ball valve 21.1 is connected to the first pump unit 01.1 via a second flexible joint 19.1. The oil outlet of the first pump unit 01.1 is connected to the first high-pressure filter 33.1. The first high-pressure filter 33.1 is connected to the first test system P1 via a second one-way valve 69.1 and a first outlet ball valve 61.1. A first shock-resistant pressure gauge 47.1 and a first electromagnetic relief valve 87.1 are installed on the pipeline between the first high-pressure filter 33.1 and the second one-way valve 69.1. A first proportional relief valve 75, a first pressure sensor 50.1, and a connecting ball valve 61.2 are installed on the pipeline between the second one-way valve 69.1 and the first outlet ball valve 61.1. The other end of the connecting ball valve 61.2 is connected to the second test system P2. The above-mentioned first main pump-motor system can be used to provide the required hydraulic power during the test process.

[0134] Furthermore, the second main pump-motor system includes a second oil suction ball valve 21.2 connected to the main oil tank 43. The second oil suction ball valve 21.2 is connected to the second pump group 01.2 via a third flexible joint 19.2. The oil outlet of the second pump group 01.2 is connected to the second high-pressure filter 33.2. The second high-pressure filter 33.2 is connected to the second test system P2 via a third one-way valve 69.2 and a second outlet ball valve 61.3. The pipeline between the second high-pressure filter 33.2 and the third one-way valve 69.2 is installed with a second shock-resistant pressure gauge 47.2 and a second electromagnetic overflow valve 87.2. The pipeline between the third one-way valve 69.2 and the second outlet ball valve 61.3 is connected to the ball valve 61.2 and is installed with a second pressure sensor 50.2. The above-mentioned second main pump-motor system can be used to provide the required hydraulic power during the test process and provide backup for the first main pump-motor system.

[0135] The operating principles of the first and second main pump-motor systems are identical. For example, the control principle of the first main pump-motor system is as follows: When the pump-motor system is started, pressurized oil enters the first pump unit 01.1 through the first suction ball valve 21.1 and the second flexible joint 19.1. The oil then flows through the first high-pressure filter 33.1, the second check valve 69.1, and the first outlet ball valve 61.1 to supply the system. The first solenoid relief valve 87.1 provides a safety pressure for the pump, ensuring it does not overload. The first high-pressure filter 33.1 primarily ensures oil cleanliness during operation, preventing impurities from entering the system circuit and causing valve sticking. The first proportional relief valve 75 provides stepless system pressure adjustment via the electronic control system. The first seismic-resistant pressure gauge 47.1 displays the system pressure. The first and second pressure sensors 50.1 and 50.2 monitor the pressure of the first and second main pump-motor systems in real time.

[0136] When the oil supply flow of the first main pump motor group system does not meet the oil demand of the first test system P1, the second outlet ball valve 61.3 of the second main pump motor group system can be closed, and the connecting ball valve 61.2 can be opened to start the first main pump motor group system and the second main pump motor group system to supply oil to the first test system P1. Similarly, when the oil supply flow of the second main pump motor group system does not meet the oil demand of the second test system P2, the first outlet ball valve 61.1 of the first pump group 01.1 can be closed, and the connecting ball valve 61.2 can be opened to start the first main pump motor group system and the second main pump motor group system to supply oil to the system P2.

[0137] If the first main pump-motor system fails, the second outlet ball valve 61.3 of the second main pump-motor system can be closed, the connecting ball valve 61.2 can be opened, and the second main pump-motor system can be started to supply oil to the first test system P1. Similarly, if the second main pump-motor system fails, the first outlet ball valve 61.1 of the first main pump-motor system can be closed, the connecting ball valve 61.2 can be opened, and the first main pump-motor system can be started to supply oil to the second test system P2.

[0138] Furthermore, the control pump-motor system includes a third oil suction ball valve 22.1 connected to the main oil tank 43. This third suction ball valve 22.1 is connected to the third pump unit 02 via a fourth flexible joint 20.1. The oil outlet of the third pump unit 02 is connected to the third high-pressure filter 34, which is then connected to the third test system P3 via a fourth check valve 70.1 and a third outlet ball valve 62.1. A third seismic-resistant pressure gauge 47.3 and a third electromagnetic relief valve 87.3 are installed in the pipeline between the third pump unit 02 and the third high-pressure filter 34. A second proportional relief valve 76 and a third pressure sensor 50.3 are installed in the pipeline between the fourth check valve 70.1 and the third outlet ball valve 62.1. The control principle of the control pump-motor system is consistent with the control principle of the first main pump-motor system.

[0139] Furthermore, the first pump group 01.1 adopts a constant pressure variable displacement plunger pump and is connected to the first drive motor 06.1 to provide oil pumping power; thereby facilitating the realization of different oil supply flow rates and pressures.

[0140] Furthermore, the second pump group 01.2 adopts a constant pressure variable displacement plunger pump and is connected to the second drive motor 06.2 to provide oil pumping power; thereby facilitating the realization of different oil supply flow rates and pressures.

[0141] Furthermore, the third pump group 02 uses a constant pressure variable displacement pump and is connected to the third drive motor 07.1 to provide oil pumping power.

[0142] Furthermore, the control valve test bench system is arranged in a valve test laboratory, and the valve test laboratory is connected to the valve station pump station room through a hydraulic pipeline; the control valve test bench system includes a second ball valve 60.9 connected to the P1 port of the first test system, and the pipeline after the second ball valve 60.9 is connected to the A oil port of the valve to be tested through the sixth ball valve 60.11; it also includes a third ball valve 60.10 connected to the P2 port of the second test system, and the pipeline after the third ball valve 60.10 is connected to the A oil port of the valve to be tested through the seventh ball valve 60.11; it also includes a fourth ball valve 63.4 connected to the P3 port of the third test system, and the fourth ball valve 63.4 is connected to the X oil port of the valve to be tested; the pipeline between the second ball valve 60.9 and the sixth ball valve 60.11 is connected to a bypass flow regulating component and a sixteenth ball valve 60.2, and the pipeline after the sixteenth ball valve 60.2 passes through the second flow meter 74, the first flow meter 75 and the second flow meter 76 in sequence. The fourteenth ball valve 59.3 and the twelfth ball valve 60.7 are connected to the B2 oil port of the valve to be tested; the A oil port of the valve to be tested is connected to the seventh ball valve 60.12, the seventh ball valve 60.12 is connected to the eighth ball valve 41.1 and the ninth ball valve 41.2, the eighth ball valve 41.1 is connected to the B1 oil port of the valve to be tested through the fifteenth ball valve 60.3, the first flow meter 73, the thirteenth ball valve 60.8, and the eleventh ball valve 60.6, and the ninth ball valve 41.2 is connected to the B2 oil port of the valve to be tested. Connect the return oil pipeline; the B3 oil port of the valve to be tested is connected to the ninth ball valve 41.2 and the eighth ball valve 41.1, and the ninth ball valve 41.2 is also connected to the eleventh ball valve 60.6 and the twelfth ball valve 60.7; the B1 oil port of the valve to be tested is connected to the tenth ball valve 60.4, and the tenth ball valve 60.4 is connected to the B2 oil port of the valve to be tested through the throttle loading assembly and the eighteenth ball valve 60.5; the Y oil port of the valve to be tested is connected to the oil tank through the fifth ball valve 59.1.

[0143] Furthermore, the bypass flow regulating assembly includes a third proportional throttle valve 78.3 and an electromagnetic reversing valve 79.2 connected in parallel, and the other ports of the third proportional throttle valve 78.3 and the electromagnetic reversing valve 79.2 are connected to the oil return pipeline.

[0144] Furthermore, the throttle loading assembly includes a first proportional throttle valve 78.1, a second proportional throttle valve 78.2, a first electromagnetic reversing valve 79.1 and a seventeenth ball valve 60.1 connected in parallel.

[0145] Example 2:

[0146] The method for performing a performance test on a valve to be tested using the hydraulic control valve test system includes a proportional flow valve test method:

[0147] Output flow-input signal characteristic test:

[0148] Step 1.1, open the second ball valve 60.9, the sixth ball valve 60.11, the eleventh ball valve 60.6, the thirteenth ball valve 60.8, and the fifteenth ball valve 60.3;

[0149] Step 1.2: Open the first outlet ball valve 61.1, close the connecting ball valve 61.2 and the second outlet ball valve 61.3, start the first pump group 01.1, and the main pump supplies oil to the first test system P1. The test pressure is adjusted by the first proportional relief valve 75, and the test flow is adjusted by the third proportional throttle valve 78.3.

[0150] In step 1.3, pressurized oil enters port A of the proportional flow valve under test through the first outlet ball valve 61.1, the second ball valve 60.9, and the sixth ball valve 60.11. Within its rated signal range, a periodic signal is input to the proportional flow valve under test. Port B (the outlet) of the proportional flow valve is then returned to port T through the eleventh ball valve 60.6, the thirteenth ball valve 60.8, the first flowmeter 73, and the fifteenth ball valve 60.3. The oil then flows back to the tank through port T. By collecting the flow signal from the first flowmeter 73, a curve is plotted with the percentage of the proportional flow valve signal as the X-axis and the flow signal from the first flowmeter 73 as the Y-axis, thereby measuring the output flow-input signal characteristic.

[0151] Steady-state flow-pressure characteristic test:

[0152] The test circuit is consistent with the output flow-input signal characteristic test circuit. A constant value signal is input to the proportional flow valve under test. Under specified increments of inlet and outlet pressures, the test pressure is adjusted by adjusting the first proportional relief valve 75. A curve is plotted with the pressure drop as the X-axis and the flow signal as the Y-axis to measure the steady-state flow-pressure characteristic. The pressure drop is: pP-pL-pT, where pP is the test pressure set by the first proportional relief valve 75, pL = |pA-pB|, pA is the inlet pressure of the proportional flow valve under test, pB is the outlet pressure of the proportional flow valve under test, and pT is the pressure at the oil return port T.

[0153] Transient characteristic test of flow control valve with pressure compensation:

[0154] Step 2.1, open the second ball valve 60.9, the sixth ball valve 60.11, the tenth ball valve 60.4, the eighteenth ball valve 60.5, the twelfth ball valve 60.7, the thirteenth ball valve 60.8, and the fifteenth ball valve 60.3;

[0155] Step 2.2: Open the first outlet ball valve 61.1, close the connecting ball valve 61.2 and the second outlet ball valve 61.3, start the first pump group 01.1, adjust the first proportional relief valve 75 to set the test pressure, and adjust the third proportional throttle valve 78.3 to set the test flow rate;

[0156] Step 2.3, first electromagnetic reversing valve 79.1 is closed first, a constant signal is input to the test flow valve, the first proportional throttle valve 78.1 is adjusted, the steady-state set flow and the pressure difference caused by the flow through the first proportional throttle valve 78.1 are read out;

[0157] Step 2.4, open the first electromagnetic reversing valve 79.1, adjust the second proportional throttle valve 78.2, read the pressure difference caused by the parallel oil way through the first proportional throttle valve 78.1 and the second proportional throttle valve 78.2;

[0158] Step 2.5, quickly close the first electromagnetic reversing valve 79.1, cause the outlet pressure step, get the instantaneous flow by indirect method or direct method, draw the pressure step flow response characteristic curve, so as to detect the transient characteristics of the test flow valve.

[0159] Example 3:

[0160] The method for testing the performance of the valve to be tested by using the hydraulic control valve test system comprises a valve test method:

[0161] Action performance test:

[0162] Step 3.1, open the third ball valve 60.10, the sixth ball valve 60.11, the twelfth ball valve 60.7, the thirteenth ball valve 60.8, the fifteenth ball valve 60.3, and the fifth ball valve 59.1;

[0163] Step 3.2, open the communication ball valve 61.2, the second outlet ball valve 61.3, and the third outlet ball valve 62.1, close the first outlet ball valve 61.1, start the first pump group 01.1, adjust the first proportional overflow valve 75 to set the test pressure, and adjust the third proportional throttle valve 78.3 to set the test flow;

[0164] Step 3.3, the pressure oil of the second test system P2 passes through the third ball valve 60.10 and the sixth ball valve 60.11, enters the A oil port of the balance valve, the oil flows forward through the one-way valve, flows out from the B oil port of the balance valve, and flows back to the oil tank through the twelfth ball valve 60.7, the thirteenth ball valve 60.8, the first flowmeter 73, and the fifteenth ball valve 60.3, at this time, the balance valve oil way is from the A oil port to the B oil port;

[0165] Step 3.4, close the sixth ball valve 60.11 and the fifteenth ball valve 60.3, open the seventh ball valve 60.12, the eighth ball valve 41.1, and the sixteenth ball valve 60.2, start the first pump group 01.1, adjust the first proportional overflow valve 75 to set the test pressure, and adjust the third proportional throttle valve 78.3 to set the test flow;

[0166] Step 3.5: Open the third outlet ball valve 62.1 and the fourth ball valve 63.4, start the third pump group 02, and the balance valve control oil pressure is regulated by the second proportional relief valve 76;

[0167] In step 3.6, the pressure oil from the second test system P2 flows through the third ball valve 60.10, the sixteenth ball valve 60.2, the first flowmeter 73, the thirteenth ball valve 60.8, and the twelfth ball valve 60.7 into port B of the balancing valve. Simultaneously, the outlet oil from the third test system P3 is controlled to provide control oil to port X of the balancing valve through the third outlet ball valve 62.1 and the fourth ball valve 63.4. The second proportional relief valve 76 is adjusted to gradually increase the control oil pressure Px from zero within the rated range of the test valve. When PB drops to 0.8 and 0.1 times the nominal pressure, the PX value is read as the control pressure variation range.

[0168] Step 3.7, under the two oil circuit states, the operating performance is detected by the positive and negative values ​​indicated by the first flow meter 73;

[0169] Internal leakage test:

[0170] Step 4.1: Open the third ball valve 60.10, the sixteenth ball valve 60.2, the fourteenth ball valve 59.3, the twelfth ball valve 60.7, the seventh ball valve 60.12, the eighth ball valve 41.1, and the fifth ball valve 59.1. Close the rest of the valves. The balancing valve oil route flows from port B to port A.

[0171] Step 4.2: Open the connecting ball valve 61.2 and the second outlet ball valve 61.3, close the first outlet ball valve 61.1, start the first pump group 01.1, adjust the first proportional relief valve 75 to set the test pressure, and adjust the third proportional throttle valve 78.3 to set the test flow rate;

[0172] Step 4.3: Maintain the pressure for at least 5 minutes and detect the internal leakage using the second flow meter 74;

[0173] Step 4.4: Open the third outlet ball valve 62.1, the fourth ball valve 63.4, the ninth ball valve 41.2, and the fifteenth ball valve 60.3. Close the sixteenth ball valve 60.2, the twelfth ball valve 60.7, the third ball valve 60.10, and the eighth ball valve 41.1. Start the third pump group 02 and adjust the second proportional relief valve 76 to a control oil pressure Px of 0.5 times the nominal pressure. Maintain this pressure for at least 2 minutes. Detect internal leakage using the second flowmeter 74.

[0174] Working range test:

[0175] Step 5.1: Close the sixth ball valve 60.11, and open the third ball valve 60.10, the sixteenth ball valve 60.2, the thirteenth ball valve 60.8, the twelfth ball valve 60.7, the seventh ball valve 60.12, the fifth ball valve 59.1, and the eighth ball valve 41.1. The balancing valve oil route is from port B to port A.

[0176] Step 5.2: Open the connecting ball valve 61.2 and the second outlet ball valve 61.3, close the first outlet ball valve 61.1, start the first pump group 01.1, adjust the first proportional relief valve 75 to set the test pressure, and adjust the third proportional throttle valve 78.3 to set the test flow rate;

[0177] Step 5.3: Open the third outlet ball valve 62.1 and the fourth ball valve 63.4, start the third pump group 02, and the balance valve control oil pressure is regulated by the second proportional relief valve 76;

[0178] Step 5.4: Adjust the second proportional relief valve 76 so that the control oil pressure Px gradually increases at the nominal flow rate, 0.25 times the nominal flow rate, and 0.08 times the nominal flow rate, respectively. Draw a working range curve with the pressure PB as the X-axis and Px as the Y-axis.

[0179] Step response test:

[0180] Step 6.1: Close the sixth ball valve 60.11, and open the third ball valve 60.10, the sixteenth ball valve 60.2, the thirteenth ball valve 60.8, the seventh ball valve 60.12, the fifth ball valve 59.1, and the eighth ball valve 41.1. The balancing valve oil route is from port B to port A.

[0181] Step 6.2: Open the connecting ball valve 61.2 and the second outlet ball valve 61.3, close the first outlet ball valve 61.1, start the first pump group 01.1, adjust the first proportional relief valve 75 to set the test pressure, and adjust the third proportional throttle valve 78.3 to set the test flow rate;

[0182] Step 6.3, open the third outlet ball valve 62.1 and the fourth ball valve 63.4, start the third pump group 02, and the balance valve control oil pressure is regulated by the second proportional relief valve 76;

[0183] Step 6.4: Within the rated signal range, adjust the control oil pressure of the second proportional relief valve 76 to quickly close the second solenoid reversing valve 79.2, generating a flow step. Draw a step response characteristic curve based on the valve inlet pressure and valve core displacement.

[0184] Minimum stable flow test:

[0185] Step 7.1, close the sixth ball valve 60.11, open the third ball valve 60.10, the sixteenth ball valve 60.2, the thirteenth ball valve 60.8, the seventh ball valve 60.12, the fifth ball valve 59.1, the eighth ball valve 41.1, and balance the valve oil circuit from the B oil port to the A oil port;

[0186] Step 7.2, open the communication ball valve 61.2, the second outlet ball valve 61.3, close the first outlet ball valve 61.1, start the first pump group 01.1, adjust the first proportional overflow valve 75 to set the test pressure, and adjust the third proportional throttle valve 78.3 to set the test flow rate;

[0187] Step 7.3, open the third outlet ball valve 62.1, the fourth ball valve 63.4, start the third pump group 02, and balance the valve control oil pressure adjusted by the second proportional overflow valve 76;

[0188] Step 7.4, change the flow rate of the hydraulic pump, repeat the transient characteristic test until the minimum stable flow rate is obtained, and observe the first flow meter 73 until the value after the decimal point is stable, thereby detecting the minimum stable flow rate.

[0189] Example 4:

[0190] The method for testing the performance of a valve to be tested using a hydraulic control valve test system includes an overflow valve test method:

[0191] Steady-state pressure-flow rate characteristic test:

[0192] Step 8.1, open the second ball valve 60.9, the sixth ball valve 60.11, the ninth ball valve 41.2, the thirteenth ball valve 60.8, the fifteenth ball valve 60.3, and the fifth ball valve 59.1;

[0193] Step 8.2, open the first outlet ball valve 61.1, close the communication ball valve 61.2, the second outlet ball valve 61.3, start the first pump group 01.1, and adjust the first proportional overflow valve 75 to set the test pressure;

[0194] Step 8.3, open the third outlet ball valve 62.1, the fourth ball valve 63.4, start the third pump group 02, adjust the overflow valve control oil pressure by the second proportional overflow valve 76, adjust the second proportional overflow valve 76 to set the pilot control oil pressure, and adjust the third proportional throttle valve 78.3 to make the valve port fully open and shunt;

[0195] Step 8.4, adjust the test overflow valve to a predetermined pressure value, and at each test pressure value, increase the test overflow valve flow rate from zero to the maximum value and then decrease it from the maximum value to the minimum value by adjusting the third proportional throttle valve 78.3, and measure the steady-state pressure-flow rate characteristic.

[0196] Flow rate step pressure response characteristic test:

[0197] Step 9.1, open the second ball valve 60.9, the sixth ball valve 60.11, the ninth ball valve 41.2, the thirteenth ball valve 60.8, the fifteenth ball valve 60.3, the fifth ball valve 59.1;

[0198] Step 9.2, open the first outlet ball valve 61.1, close the communication ball valve 61.2, the second outlet ball valve 61.3, start the first pump group 01.1, adjust the first proportional overflow valve 75 to set the test pressure;

[0199] Step 9.3, open the third outlet ball valve 62.1, the fourth ball valve 63.4, start the third pump group 02, the overflow valve control oil pressure is adjusted by the second proportional overflow valve 76, adjust the second proportional overflow valve 76 to set the pilot control oil pressure, adjust the third proportional throttle valve 78.3 to make the test pressure drop to the starting pressure, ensure that the starting pressure value at the valve port is not greater than 20% of the final steady-state pressure value;

[0200] Step 9.4, quickly close the second electromagnetic reversing valve 79.2, so that a pressure gradient is generated in the closed loop, and the pressure response characteristic is measured by detecting the inlet pressure.

[0201] Example 5:

[0202] The method for testing the performance of a valve to be tested using a hydraulic control valve test system includes a pressure reducing valve test method:

[0203] Steady-state pressure-flow characteristic test:

[0204] Step 10.1, open the second ball valve 60.9, the sixth ball valve 60.11, the tenth ball valve 60.4, the seventeenth ball valve 60.1, the eighteenth ball valve 60.5, the twelfth ball valve 60.7, the thirteenth ball valve 60.8, the fifteenth ball valve 60.3, the fifth ball valve 59.1;

[0205] Step 10.2, open the first outlet ball valve 61.1, close the communication ball valve 61.2, the second outlet ball valve 61.3, start the first pump group 01.1, adjust the first proportional overflow valve 75 to set the test pressure;

[0206] Step 10.3, open the third outlet ball valve 62.1, the fourth ball valve 63.4, start the third pump group 02, the second proportional overflow valve 76 sets the pilot control oil pressure, adjust the third proportional throttle valve 78.3 to make the valve port full open split;

[0207] Step 10.4, close the first proportional throttle valve 78.1, adjust the second proportional throttle valve 78.2 to a certain opening;

[0208] In step 10.5, the pressure reducing valve under test is set to the required test flow and outlet pressure values, including the valve's maximum and minimum pressure values. At each test pressure value, the flow of the pressure reducing valve under test is increased from zero to the maximum value, and then decreased from the maximum value to the minimum value, by adjusting the third proportional throttle valve 78.3, and its steady-state pressure-flow characteristic is measured. During the test, the inlet pressure of the valve under test should be maintained at the rated pressure value.

[0209] Inlet pressure step pressure response characteristic test:

[0210] Step 11.1, open the second ball valve 60.9, the sixth ball valve 60.11, the tenth ball valve 60.4, the seventeenth ball valve 60.1, the eighteenth ball valve 60.5, the twelfth ball valve 60.7, the thirteenth ball valve 60.8, the fifteenth ball valve 60.3, and the fifth ball valve 59.1;

[0211] Step 11.2: Open the first outlet ball valve 61.1, close the connecting ball valve 61.2 and the second outlet ball valve 61.3, start the first pump group 01.1, and adjust the first proportional relief valve 75 to set the test pressure;

[0212] Step 11.3: Open the third outlet ball valve 62.1 and the fourth ball valve 63.4, start the third pump group 02, adjust the second proportional relief valve 76 to set the pilot oil pressure, and adjust the third proportional throttle valve 78.3 to reduce the test pressure to the starting pressure. To ensure full opening of the valve core of the test valve, ensure that this starting pressure does not exceed 50% of the test valve outlet pressure value and 20% of the set inlet pressure value of the test valve;

[0213] Step 11.4, closing the first proportional throttle valve 78.1 and the second proportional throttle valve 78.2;

[0214] Step 11.5: quickly close the second electromagnetic reversing valve 79.2 to cause a pressure step at the inlet of the test valve. The pressure response characteristic of the valve is measured by the change in the valve outlet pressure.

[0215] Outlet flow rate step pressure response characteristic test:

[0216] Step 12.1, open the second ball valve 60.9, the sixth ball valve 60.11, the tenth ball valve 60.4, the eighteenth ball valve 60.5, the twelfth ball valve 60.7, the thirteenth ball valve 60.8, the fifteenth ball valve 60.3, and the fifth ball valve 59.1;

[0217] Step 12.2: Open the first outlet ball valve 61.1, close the connecting ball valve 61.2 and the second outlet ball valve 61.3, start the first pump group 01.1, and adjust the first proportional relief valve 75 to set the test pressure;

[0218] Step 12.3: Open the third outlet ball valve 62.1 and the fourth ball valve 63.4, start the third pump group 02, adjust the second proportional relief valve 76 to set the pilot control oil pressure, and adjust the third proportional throttle valve 78.3 to set the test flow rate;

[0219] Step 12.4, close the first proportional throttle valve 78.1 and the second proportional throttle valve 78.2;

[0220] Step 12.5: Adjust the test valve and the second proportional throttle valve 78.2 so that the flow rate and outlet pressure of the test valve are set to the required test values. Close the first electromagnetic reversing valve 79.1 so that the outlet flow of the test valve is zero.

[0221] Step 12.6: Quickly open the first electromagnetic reversing valve 79.1 to generate a flow step change in the test valve outlet circuit. The pressure response characteristic is measured by the change in the valve outlet pressure.

[0222] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein with equivalents. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A hydraulic control valve test system, characterized in that: Includes a hydraulic pump station system for providing hydraulic power during the test; The hydraulic pump station system includes an oil tank system, to which a first main pump-motor system and a second main pump-motor system are connected in parallel. The first main pump-motor system is used to provide hydraulic power for the first test system P1, and the second main pump-motor system is used to provide hydraulic power for the second test system P2. The oil tank system is connected to a control pump-motor system, which is used to provide hydraulic power for the third test system P3. The first test system P1, the second test system P2 and the third test system P3 are connected to a control valve test bench system for testing the valve to be tested; The valves to be tested include a proportional flow valve to be tested, a balancing valve to be tested, a pressure reducing valve to be tested, and a relief valve to be tested; The control valve test bench system is arranged in a valve test laboratory, which is connected to the valve platform pump station room through a hydraulic pipeline; The control valve test bench system includes a second ball valve (60.9) connected to the P1 port of the first test system, and the pipeline after the second ball valve (60.9) is connected to the A oil port of the valve to be tested through the sixth ball valve (60.11); It also includes a third ball valve (60.10) connected to the P2 port of the second test system, and the pipeline after the third ball valve (60.10) is connected to the A oil port of the valve to be tested through a seventh ball valve (60.11); Also included is a fourth ball valve (63.4) connected to the P3 port of the third test system, the fourth ball valve (63.4) being connected to the X oil port of the valve to be tested; The pipeline between the second ball valve (60.9) and the sixth ball valve (60.11) is connected to the inlet of the bypass flow regulating assembly and the inlet of the sixteenth ball valve (60.2), the outlet of the bypass flow regulating assembly is connected to the oil return pipeline, and the pipeline after the sixteenth ball valve (60.2) is connected to the B2 oil port of the valve to be tested through the second flow meter (74), the fourteenth ball valve (59.3) and the twelfth ball valve (60.7) in sequence; The A oil port of the valve to be tested is connected to the seventh ball valve (60.12), the seventh ball valve (60.12) is connected to the eighth ball valve (41.1) and the ninth ball valve (41.2), the eighth ball valve (41.1) is connected to the B1 oil port of the valve to be tested through the fifteenth ball valve (60.3), the first flow meter (73), the thirteenth ball valve (60.8), and the eleventh ball valve (60.6), and the ninth ball valve (41.2) is connected to the return oil pipeline through the eighth ball valve (41.1); The B3 oil port of the valve to be tested is connected to the ninth ball valve (41.2) and the eighth ball valve (41.1), and the ninth ball valve (41.2) is connected to the eleventh ball valve (60.6) and the twelfth ball valve (60.7) at the same time; the ninth ball valve (41.2) is connected to the B1 oil port of the valve to be tested through the eleventh ball valve (60.6), and the ninth ball valve (41.2) is connected to the B2 oil port of the valve to be tested through the twelfth ball valve (60.7); The B1 oil port of the valve to be tested is connected to the tenth ball valve (60.4), and the tenth ball valve (60.4) is connected to the B2 oil port of the valve to be tested through the throttle loading assembly and the eighteenth ball valve (60.5); The Y oil port of the valve to be tested is connected to the oil tank through the fifth ball valve (59.1); The throttling loading assembly comprises a first proportional throttle valve (78.1), a second proportional throttle valve (78.2), a first electromagnetic reversing valve (79.1), and a seventeenth ball valve (60.1) connected in parallel.

2. A hydraulic control valve test system according to claim 1, characterized in that: The entire hydraulic pump station system is set up inside the valve station pump station room; The oil tank system comprises a main oil tank (43), a plurality of oil drain ball valves (42) are provided on the main oil tank (43), a plurality of heaters (28) are provided inside the main oil tank (43), and a liquid level sensor (25), a visual liquid level gauge (23), a temperature sensor (27), an oil return filter (92), an oil filling filter (30) and an oil sampling ball valve (91) are also installed on the main oil tank (43).

3. A hydraulic control valve test system according to claim 2, characterized in that: The main oil tank (43) is connected to a cooling circulation device for cooling the oil. The cooling circulation device includes a switch-transmitting ball valve (90) connected to the main oil tank (43). The switch-transmitting ball valve (90) is connected to the cooling pump motor unit (07.2) through a first flexible joint (89). The outlet of the cooling pump motor unit (07.2) is connected to the cooler (29) through a first one-way valve (66). The outlet of the cooler (29) is connected in parallel with a first ball valve (96). The first ball valve (96) is connected to the main oil tank (43) through a filter (32).

4. A hydraulic control valve test system according to claim 3, characterized in that: The cooler (29) is a plate-type cooler. A water inlet ball valve (71.1) for cooling water is connected to the cooler (29). An electromagnetic water valve (72) is installed on the pipeline after the water inlet ball valve (71.1). The cooling water outlet of the cooler (29) is connected to a water outlet ball valve (71.2).

5. A hydraulic control valve test system according to claim 4, characterized in that: The first main pump motor group system includes a first oil suction ball valve (21.1) connected to the main oil tank (43), the first oil suction ball valve (21.1) is connected to the first pump group (01.1) through a second flexible joint (19.1), the oil outlet of the first pump group (01.1) is connected to the first high-pressure filter (33.1), and the first high-pressure filter (33.1) is connected to the first test system P1 through a second one-way valve (69.1) and a first outlet ball valve (61.1) in sequence; a first shock-resistant pressure gauge (47.1) and a first electromagnetic overflow valve (87.1) are installed on the pipeline between the first high-pressure filter (33.1) and the second one-way valve (69.1); a first proportional overflow valve (75), a first pressure sensor (50.1) and a connecting ball valve (61.2) are installed on the pipeline between the second one-way valve (69.1) and the first outlet ball valve (61.1), and the other end of the connecting ball valve (61.2) is connected to the second test system P2.

6. A hydraulic control valve test system according to claim 5, characterized in that: The second main pump motor group system includes a second oil suction ball valve (21.2) connected to the main oil tank (43), the second oil suction ball valve (21.2) is connected to the second pump group (01.2) through a third flexible joint (19.2), the oil outlet of the second pump group (01.2) is connected to the second high-pressure filter (33.2), and the second high-pressure filter (33.2) is connected to the second test system P2 through a third one-way valve (69.2) and a second outlet ball valve (61.3) in sequence; a second shock-resistant pressure gauge (47.2) and a second electromagnetic overflow valve (87.2) are installed on the pipeline between the second high-pressure filter (33.2) and the third one-way valve (69.2); the pipeline between the third one-way valve (69.2) and the second outlet ball valve (61.3) is connected to the connecting ball valve (61.2) and is installed with a second pressure sensor (50.2).

7. A hydraulic control valve test system according to claim 6, characterized in that: The control pump motor group system includes a third oil suction ball valve (22.1) connected to the main oil tank (43), the third oil suction ball valve (22.1) is connected to the third pump group (02) through a fourth flexible joint (20.1), the oil outlet of the third pump group (02) is connected to the third high-pressure filter (34), and the third high-pressure filter (34) is connected to the third test system P3 through a fourth one-way valve (70.1) and a third outlet ball valve (62.1) in sequence; a third shock-resistant pressure gauge (47.3) and a third electromagnetic overflow valve (87.3) are installed on the pipeline between the third pump group (02) and the third high-pressure filter (34); and a second proportional overflow valve (76) and a third pressure sensor (50.3) are installed on the pipeline between the fourth one-way valve (70.1) and the third outlet ball valve (62.1).

8. A hydraulic control valve test system according to claim 7, characterized in that: The first pump group (01.1) adopts a constant pressure variable displacement plunger pump and is connected to a first drive motor (06.1) to provide pumping oil power; The second pump group (01.2) adopts a constant pressure variable displacement plunger pump and is connected to a second drive motor (06.2) to provide pump oil power; The third pump group (02) uses a constant pressure variable displacement pump and is connected to a third drive motor (07.1) to provide pumping oil power.

9. A hydraulic control valve test system according to claim 8, characterized in that: The bypass flow regulating assembly comprises a third proportional throttle valve (78.3) and an electromagnetic reversing valve (79.2) connected in parallel, and the other ends of the third proportional throttle valve (78.3) and the electromagnetic reversing valve (79.2) are connected to the oil return pipeline.

10. A method for performing a performance test on a valve to be tested using the hydraulic control valve test system according to claim 9, characterized in that: Including the test method of the proportional flow valve to be tested: Output flow-input signal characteristic test: Step 1.1, open the second ball valve (60.9), the sixth ball valve (60.11), the eleventh ball valve (60.6), the thirteenth ball valve (60.8), and the fifteenth ball valve (60.3); Step 1.2, open the first outlet ball valve (61.1), close the connecting ball valve (61.2) and the second outlet ball valve (61.3), start the first pump group (01.1), and the main pump supplies oil to the first test system P1. The test pressure is adjusted by the first proportional relief valve (75), and the test flow is adjusted by the third proportional throttle valve (78.3); Step 1.3, the pressure oil enters the A oil port of the proportional flow valve to be tested through the first outlet ball valve (61.1), the second ball valve (60.9), and the sixth ball valve (60.11), and within its rated signal range, inputs a periodic signal to the proportional flow valve to be tested, the B oil port of the proportional flow valve to be tested, and the oil returns to the return T oil port through the eleventh ball valve (60.6), the thirteenth ball valve (60.8), the first flow meter (73), and the fifteenth ball valve (60.3), and flows back to the oil tank through the T oil port; by collecting the flow signal of the first flow meter (73), a curve is drawn with the given proportional flow valve signal percentage as the X axis and the first flow meter (73) flow signal as the Y axis, thereby measuring the output flow-input signal characteristic; Steady-state flow-pressure characteristic test: The test circuit is consistent with the output flow-input signal characteristic test circuit, and a constant value signal is input to the proportional flow valve to be tested. Under the specified increments of the inlet and outlet pressures, the test pressure is adjusted by adjusting the first proportional relief valve (75), and a curve is drawn with the pressure drop as the X axis and the flow signal as the Y axis, thereby measuring the steady-state flow-pressure characteristic; the pressure drop is: pP-pL-pT, where pP is the test pressure set by the first proportional relief valve (75), pL=|pA-pB|, pA is the inlet pressure of the proportional flow valve to be tested, pB is the outlet pressure of the proportional flow valve to be tested, and pT is the pressure of the return oil port T; Transient characteristic test of flow control valve with pressure compensation: Step 2.1, open the second ball valve (60.9), the sixth ball valve (60.11), the tenth ball valve (60.4), the eighteenth ball valve (60.5), the twelfth ball valve (60.7), the thirteenth ball valve (60.8), and the fifteenth ball valve (60.3); Step 2.2, open the first outlet ball valve (61.1), close the connecting ball valve (61.2) and the second outlet ball valve (61.3), start the first pump group (01.1), adjust the first proportional relief valve (75) to set the test pressure, and adjust the third proportional throttle valve (78.3) to set the test flow; Step 2.3: First, close the first electromagnetic reversing valve (79.1), input a constant value signal to the proportional flow valve to be tested, adjust the first proportional throttle valve (78.1), and read the steady-state set flow rate and the pressure difference caused by the flow through the first proportional throttle valve (78.1); Step 2.4, open the first electromagnetic reversing valve (79.1), adjust the second proportional throttle valve (78.2), and read the pressure difference caused by the parallel oil circuit of the first proportional throttle valve (78.1) and the second proportional throttle valve (78.2); In step 2.5, the first electromagnetic reversing valve (79.1) is quickly closed to cause an outlet pressure step. The instantaneous flow rate is obtained by an indirect method or a direct method, and a pressure step flow rate response characteristic curve is drawn to detect the transient characteristics of the proportional flow valve to be tested.

11. A method for performing a performance test on a valve to be tested using the hydraulic control valve test system according to claim 9, characterized in that: Including the test method of the balancing valve to be tested: Action performance test: Step 3.1, open the third ball valve (60.10), the sixth ball valve (60.11), the twelfth ball valve (60.7), the thirteenth ball valve (60.8), the fifteenth ball valve (60.3), and the fifth ball valve (59.1); Step 3.2, open the connecting ball valve (61.2), the second outlet ball valve (61.3), and the third outlet ball valve (62.1), close the first outlet ball valve (61.1), start the first pump group (01.1), adjust the first proportional relief valve (75) to set the test pressure, and adjust the third proportional throttle valve (78.3) to set the test flow; Step 3.3, the pressure oil of the second test system P2 passes through the third ball valve (60.10) and the sixth ball valve (60.11) and enters the oil port A of the balancing valve to be tested. The oil flows forward through the one-way valve and flows out from the oil port B of the balancing valve to be tested. The oil passes through the twelfth ball valve (60.7), the thirteenth ball valve (60.8), the first flow meter (73), and the fifteenth ball valve (60.3) and flows back to the oil tank. At this time, the oil route of the balancing valve to be tested is from the oil port A to the oil port B. Step 3.4, close the sixth ball valve (60.11) and the fifteenth ball valve (60.3), open the seventh ball valve (60.12), the eighth ball valve (41.1), and the sixteenth ball valve (60.2), start the first pump group (01.1), adjust the first proportional relief valve (75) to set the test pressure, and adjust the third proportional throttle valve (78.3) to set the test flow; Step 3.5, open the third outlet ball valve (62.1) and the fourth ball valve (63.4), start the third pump group (02), and the control oil pressure of the balance valve to be tested is regulated by the second proportional relief valve (76); Step 3.6, the pressure oil of the second test system P2 enters the B oil port of the balancing valve to be tested through the third ball valve (60.10), the sixteenth ball valve (60.2), the first flow meter (73), the thirteenth ball valve (60.8), and the twelfth ball valve (60.7). At the same time, the outlet oil of the third test system P3 is controlled to provide control oil to the X oil port of the balancing valve to be tested through the third outlet ball valve (62.1) and the fourth ball valve (63.4). The second proportional relief valve (76) is adjusted to gradually increase the control oil pressure Px from zero within the rated range of the balancing valve to be tested. When PB drops to 0.8 times and 0.1 times the nominal pressure value, the PX value read is the control pressure variation range; Step 3.7, under the two oil circuit states, the operating performance is detected by the positive and negative values ​​indicated by the first flow meter (73); Internal leakage test: Step 4.1: Open the third ball valve (60.10), the sixteenth ball valve (60.2), the fourteenth ball valve (59.3), the twelfth ball valve (60.7), the seventh ball valve (60.12), the eighth ball valve (41.1), and the fifth ball valve (59.1). Close the rest of the ball valves. The oil route of the balancing valve to be tested is from port B to port A. Step 4.2, open the connecting ball valve (61.2) and the second outlet ball valve (61.3), close the first outlet ball valve (61.1), start the first pump group (01.1), adjust the first proportional relief valve (75) to set the test pressure, and adjust the third proportional throttle valve (78.3) to set the test flow; Step 4.3, maintaining the pressure for at least 5 minutes, and detecting the internal leakage through the second flow meter (74); Step 4.4, open the third outlet ball valve (62.1), the fourth ball valve (63.4), the ninth ball valve (41.2), and the fifteenth ball valve (60.3), close the sixteenth ball valve (60.2), the twelfth ball valve (60.7), the third ball valve (60.10), and the eighth ball valve (41.1), start the third pump group (02), adjust the second proportional relief valve (76) so that the control oil pressure Px is 0.5 times the nominal pressure, maintain the pressure for at least 2 minutes, and detect the internal leakage through the second flow meter (74).

12. The method for performing a performance test on a valve to be tested using a hydraulic control valve testing system according to claim 11, characterized in that: The test method for the balancing valve to be tested also includes: Working range test: Step 5.1, close the sixth ball valve (60.11), open the third ball valve (60.10), the sixteenth ball valve (60.2), the thirteenth ball valve (60.8), the twelfth ball valve (60.7), the seventh ball valve (60.12), the fifth ball valve (59.1), and the eighth ball valve (41.1), and the oil route of the balancing valve to be tested is from the B oil port to the A oil port; Step 5.2, open the connecting ball valve (61.2) and the second outlet ball valve (61.3), close the first outlet ball valve (61.1), start the first pump group (01.1), adjust the first proportional relief valve (75) to set the test pressure, and adjust the third proportional throttle valve (78.3) to set the test flow; Step 5.3, open the third outlet ball valve (62.1) and the fourth ball valve (63.4), start the third pump group (02), and the control oil pressure of the balance valve to be tested is regulated by the second proportional relief valve (76); Step 5.4, adjust the second proportional relief valve (76) so that the control oil pressure Px gradually increases at the nominal flow rate, 0.25 times the nominal flow rate, and 0.08 times the nominal flow rate, respectively, and draw a working range curve with the pressure PB as the X-axis and Px as the Y-axis; Step response test: Step 6.1, close the sixth ball valve (60.11), open the third ball valve (60.10), the sixteenth ball valve (60.2), the thirteenth ball valve (60.8), the seventh ball valve (60.12), the fifth ball valve (59.1), and the eighth ball valve (41.1), and the oil route of the balancing valve to be tested is from the B oil port to the A oil port; Step 6.2, open the connecting ball valve (61.2) and the second outlet ball valve (61.3), close the first outlet ball valve (61.1), start the first pump group (01.1), adjust the first proportional relief valve (75) to set the test pressure, and adjust the third proportional throttle valve (78.3) to set the test flow; Step 6.3, open the third outlet ball valve (62.1) and the fourth ball valve (63.4), start the third pump group (02), and the control oil pressure of the balance valve to be tested is regulated by the second proportional relief valve (76); Step 6.4, within the rated signal range, adjust the second proportional relief valve (76) to set the control oil pressure, quickly close the second electromagnetic reversing valve (79.2), generate a flow step, and draw a step response characteristic curve based on the valve inlet pressure and valve core displacement; Minimum stable flow test: Step 7.1, close the sixth ball valve (60.11), open the third ball valve (60.10), the sixteenth ball valve (60.2), the thirteenth ball valve (60.8), the seventh ball valve (60.12), the fifth ball valve (59.1), and the eighth ball valve (41.1), and the oil route of the balancing valve to be tested is from the B oil port to the A oil port; Step 7.2, open the connecting ball valve (61.2) and the second outlet ball valve (61.3), close the first outlet ball valve (61.1), start the first pump group (01.1), adjust the first proportional relief valve (75) to set the test pressure, and adjust the third proportional throttle valve (78.3) to set the test flow; Step 7.3, open the third outlet ball valve (62.1) and the fourth ball valve (63.4), start the third pump group (02), and the control oil pressure of the test balancing valve is regulated by the second proportional relief valve (76); Step 7.4, change the flow rate of the hydraulic pump and repeat the transient characteristic test until the minimum stable flow rate is obtained, and observe the first flow meter (73) until the displayed value is stable to one decimal place, thereby detecting its minimum stable flow rate.

13. A method for performing a performance test on a valve to be tested using the hydraulic control valve test system according to claim 9, characterized in that: Including the test method of the overflow valve to be tested: Steady-state pressure-flow characteristic test: Step 8.1, open the second ball valve (60.9), the sixth ball valve (60.11), the ninth ball valve (41.2), the thirteenth ball valve (60.8), the fifteenth ball valve (60.3), and the fifth ball valve (59.1); Step 8.2, open the first outlet ball valve (61.1), close the connecting ball valve (61.2) and the second outlet ball valve (61.3), start the first pump group (01.1), and adjust the first proportional relief valve (75) to set the test pressure; Step 8.3, open the third outlet ball valve (62.1) and the fourth ball valve (63.4), start the third pump group (02), and adjust the control oil pressure of the overflow valve to be tested by the second proportional overflow valve (76). Adjust the second proportional overflow valve (76) to set the pilot control oil pressure, and adjust the third proportional throttle valve (78.3) to make the valve port fully open for diversion; Step 8.4: Adjust the relief valve to a predetermined pressure value. At each test pressure value, adjust the third proportional throttle valve (78.3) to increase the flow rate of the relief valve from zero to a maximum value and then decrease it from the maximum value to a minimum value, and measure its steady-state pressure-flow characteristic. Flow step pressure response characteristic test: Step 9.1, open the second ball valve (60.9), the sixth ball valve (60.11), the ninth ball valve (41.2), the thirteenth ball valve (60.8), the fifteenth ball valve (60.3), and the fifth ball valve (59.1); Step 9.2, open the first outlet ball valve (61.1), close the connecting ball valve (61.2) and the second outlet ball valve (61.3), start the first pump group (01.1), and adjust the first proportional relief valve (75) to set the test pressure; Step 9.3, open the third outlet ball valve (62.1) and the fourth ball valve (63.4), start the third pump group (02), and adjust the control oil pressure of the overflow valve to be tested by the second proportional overflow valve (76). Adjust the second proportional overflow valve (76) to set the pilot control oil pressure, and adjust the third proportional throttle valve (78.3) to reduce the test pressure to the starting pressure, ensuring that the starting pressure value at the overflow valve port to be tested is no more than 20% of the final steady-state pressure value; Step 9.4, quickly close the second electromagnetic reversing valve (79.2) to generate a pressure gradient in the closed circuit, and measure its pressure response characteristics by detecting the inlet pressure.

14. A method for performing a performance test on a valve to be tested using the hydraulic control valve test system according to claim 9, characterized in that: Including the test method of the pressure reducing valve to be tested: Steady-state pressure-flow characteristic test: Step 10.1, open the second ball valve (60.9), the sixth ball valve (60.11), the tenth ball valve (60.4), the seventeenth ball valve (60.1), the eighteenth ball valve (60.5), the twelfth ball valve (60.7), the thirteenth ball valve (60.8), the fifteenth ball valve (60.3), and the fifth ball valve (59.1); Step 10.2, open the first outlet ball valve (61.1), close the connecting ball valve (61.2) and the second outlet ball valve (61.3), start the first pump group (01.1), and adjust the first proportional relief valve (75) to set the test pressure; Step 10.3, open the third outlet ball valve (62.1) and the fourth ball valve (63.4), start the third pump group (02), set the pilot control oil pressure on the second proportional relief valve (76), and adjust the third proportional throttle valve (78.3) to fully open the valve port for diversion; Step 10.4, close the first proportional throttle valve (78.1) and adjust the second proportional throttle valve (78.2) to a certain opening; Step 10.5: Set the pressure reducing valve to be tested to the required test flow and outlet pressure values, including the maximum and minimum pressure values ​​of the valve. At each test pressure value, adjust the third proportional throttle valve (78.3) to increase the flow of the pressure reducing valve to be tested from zero to the maximum value and then decrease it from the maximum value to the minimum value, and measure its steady-state pressure-flow characteristic. During the test, the inlet pressure of the pressure reducing valve to be tested should be kept stable at the rated pressure value. Inlet pressure step pressure response characteristic test: Step 11.1, open the second ball valve (60.9), the sixth ball valve (60.11), the tenth ball valve (60.4), the seventeenth ball valve (60.1), the eighteenth ball valve (60.5), the twelfth ball valve (60.7), the thirteenth ball valve (60.8), the fifteenth ball valve (60.3), and the fifth ball valve (59.1); Step 11.2, open the first outlet ball valve (61.1), close the connecting ball valve (61.2) and the second outlet ball valve (61.3), start the first pump group (01.1), and adjust the first proportional relief valve (75) to set the test pressure; Step 11.3, open the third outlet ball valve (62.1) and the fourth ball valve (63.4), start the third pump group (02), adjust the second proportional relief valve (76) to set the pilot control oil pressure, and adjust the third proportional throttle valve (78.3) to reduce the test pressure to the starting pressure. To ensure the full opening of the valve core of the pressure reducing valve to be tested, ensure that the starting pressure does not exceed 50% of the outlet pressure value of the pressure reducing valve to be tested and 20% of the set inlet pressure value of the pressure reducing valve to be tested; Step 11.4, close the first proportional throttle valve (78.1) and the second proportional throttle valve (78.2); Step 11.5, quickly close the second electromagnetic reversing valve (79.2), causing a pressure step at the inlet of the pressure reducing valve to be tested, and measure its pressure response characteristics through the change in the valve outlet pressure; Outlet flow rate step pressure response characteristic test: Step 12.1, open the second ball valve (60.9), the sixth ball valve (60.11), the tenth ball valve (60.4), the eighteenth ball valve (60.5), the twelfth ball valve (60.7), the thirteenth ball valve (60.8), the fifteenth ball valve (60.3), and the fifth ball valve (59.1); Step 12.2, open the first outlet ball valve (61.1), close the connecting ball valve (61.2) and the second outlet ball valve (61.3), start the first pump group (01.1), and adjust the first proportional relief valve (75) to set the test pressure; Step 12.3, open the third outlet ball valve (62.1) and the fourth ball valve (63.4), start the third pump group (02), adjust the second proportional relief valve (76) to set the pilot control oil pressure, and adjust the third proportional throttle valve (78.3) to set the test flow; Step 12.4, close the first proportional throttle valve (78.1) and the second proportional throttle valve (78.2); Step 12.5, adjust the pressure reducing valve to be tested and the second proportional throttle valve (78.2) so that the flow rate and outlet pressure of the pressure reducing valve to be tested are set to the required test values, and close the first electromagnetic reversing valve (79.1) so that the outlet flow rate of the pressure reducing valve to be tested is zero; Step 12.6: Quickly open the first electromagnetic reversing valve (79.1) to generate a flow step change in the outlet circuit of the pressure reducing valve to be tested, and measure its pressure response characteristics through the change in the valve outlet pressure.

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