Detection equipment for hydraulic system valve

Abstract

The utility model discloses a detection device used for a hydraulic system valve, comprising a first detection station provided with a first valve connection group; the second detection station is provided with a second valve connecting group; the first valve connecting set and the second valve connecting set are each composed of a plurality of connecting ports. The drift diameters of all the connecting ports of the first valve connecting group are larger than those of all the connecting ports of the second valve connecting group; the detection assembly is connected with the first valve connecting set and the second valve connecting set, and the detection assembly comprises a working oil way flow meter and a pressure sensor; the driving assembly is connected with the working oil way flowmeter through a pipeline so as to drive hydraulic oil in the detection equipment to flow into the first valve connecting set or the second valve connecting set after flowing through the working oil way flowmeter. The detection of hydraulic system valves with different drift diameters can be compatible by using the first valve connection group and the second valve connection group with different drift diameters.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic system valve testing technology, and in particular to a testing device for hydraulic system valves. Background Technology

[0002] In hydraulic systems, various valves play a crucial role, and their performance directly affects the stable operation and efficiency of the entire system. Therefore, after valve production or repair, it is necessary to test their pressure resistance, flow rate, and other performance characteristics. Existing hydraulic system valves, such as directional control valves and relief valves, come in numerous different diameters. Traditional testing equipment is limited in function, generally only capable of testing valves of a specified diameter, making it difficult to simultaneously test valves of multiple different diameters. When testing valves of different diameters, frequent equipment changes are required, consuming manpower, resources, and time, and the complex operation process also impacts testing efficiency. Utility Model Content

[0003] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a testing device for valves in hydraulic systems, capable of testing valves of different diameters.

[0004] A testing device for valves in a hydraulic system according to an embodiment of the present invention includes:

[0005] The first testing station is equipped with the first valve connection group;

[0006] The second testing station is equipped with a second valve connection group;

[0007] Both the first valve connection group and the second valve connection group consist of multiple connection ports;

[0008] The diameter of all ports in the first valve connection group is larger than the diameter of all ports in the second valve connection group.

[0009] The detection component is connected to the first valve connection group and the second valve connection group respectively. The detection component includes a working oil circuit flow meter and a pressure sensor. The working oil circuit flow meter is used to detect the flow rate of hydraulic oil flowing through the first valve connection group or the second valve connection group, and the pressure sensor is used to detect the pressure of hydraulic oil flowing through the first valve connection group or the second valve connection group.

[0010] The drive assembly is connected to the working oil circuit flow meter via a pipeline to drive the hydraulic oil in the detection equipment to flow through the working oil circuit flow meter and then into the first valve connection group or the second valve connection group.

[0011] According to an embodiment of this utility model, a testing device for valves in a hydraulic system has at least the following advantages: Since the diameter of all connections in the first valve connection group at the first testing station is larger than the diameter of all connections in the second valve connection group at the second testing station, it enables testing of valves with different diameters. Using a flow meter and pressure sensor in the working oil circuit, the flow rate and pressure of hydraulic oil flowing through the first or second valve connection group can be detected and collected. The collected pressure and flow rate data can also be used to generate characteristic curves through a data processor.

[0012] During testing, when testing large-diameter hydraulic system valves, the testing is performed at the first testing station. The valve to be tested is connected to the first valve connection group, and then the second valve connection group is blocked. The drive assembly is started, and the hydraulic oil in the testing equipment flows through the working oil circuit flow meter and then into the first valve connection group. At this time, the hydraulic oil flowing through the first valve connection group can be detected in real time through the working oil circuit flow meter and pressure sensor, thereby detecting the hydraulic oil flowing through the valve to be tested in real time and obtaining the test value of the valve to be tested, thus improving the testing efficiency and accuracy.

[0013] When it is necessary to test a small-diameter valve, the above operation can be performed using the second testing station to complete the test.

[0014] According to an embodiment of the present invention, a testing device for valves in a hydraulic system includes a first valve connection group comprising a first oil inlet, a first oil return port, a first working oil port, and a second working oil port, wherein multiple pressure sensors are respectively connected to the first oil inlet, the first oil return port, the first working oil port, and the second working oil port via pipelines.

[0015] According to an embodiment of the present invention, a testing device for valves in a hydraulic system is provided at a first testing station, comprising a first plate ball valve, a second plate ball valve, a third plate ball valve, and a fourth plate ball valve. The first plate ball valve is connected to a first oil inlet, the second plate ball valve is connected to a first oil return port, the third plate ball valve is connected to a first working oil port, and the fourth plate ball valve is connected to a second working oil port.

[0016] According to an embodiment of the present invention, a testing device for valves in a hydraulic system is provided. The end of the working oil circuit flow meter away from the drive assembly is connected to a third plate ball valve through a pipe, and the end of the drive assembly away from the working oil circuit flow meter is connected to a fourth plate ball valve through a pipe. When both the third and fourth plate ball valves are open, the drive assembly drives the hydraulic oil in the first working port to flow through the working oil circuit flow meter and then to the second working port.

[0017] According to an embodiment of the present invention, a testing device for valves in a hydraulic system includes a first testing station that further includes a fifth plate ball valve. The two ends of the fifth plate ball valve are respectively connected to the first return port and the small flow meter of the testing component via pipes.

[0018] According to an embodiment of the present invention, a testing device for valves in a hydraulic system includes a first testing station further comprising a fifth plate ball valve, a first plate three-way ball valve being disposed above the first testing station, the two ends of the fifth plate ball valve being connected to the first return port and the inlet of the first plate three-way ball valve respectively via pipes, and the two outlets of the first plate three-way ball valve being connected to the small flow meter and the measuring cylinder of the testing component respectively via pipes.

[0019] According to an embodiment of the present invention, a testing device for valves in a hydraulic system further includes a pressure relief assembly, which includes a first pressure relief throttle valve and a second pressure relief throttle valve. The first pressure relief throttle valve is connected to a first working oil port through a pipeline, and the second pressure relief throttle valve is connected to a second working oil port through a pipeline.

[0020] According to an embodiment of the present invention, a testing device for valves in a hydraulic system is provided, wherein a pressure sensor is connected to the pipeline between the first pressure relief throttle valve and the first working oil port, and a pressure sensor is also connected to the pipeline between the second pressure relief throttle valve and the second working oil port.

[0021] According to an embodiment of the present invention, a testing device for valves in a hydraulic system includes a drive assembly comprising a first motor, a second motor, and a third motor with different power ratings. The first motor, the second motor, and the third motor are all connected to a working oil circuit flow meter via pipelines.

[0022] According to an embodiment of the present invention, a testing device for valves in a hydraulic system is provided, wherein both the first valve connection group and the second valve connection group are connected to pressure gauges.

[0023] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0024] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0025] Figure 1 This is a perspective view of a testing device for valves in a hydraulic system, according to an embodiment of the present invention.

[0026] Figure 2 This is a front view of a testing device for valves in a hydraulic system according to an embodiment of the present invention.

[0027] Figure 3 This is a rear view of a testing device for valves in a hydraulic system according to an embodiment of the present invention.

[0028] Figure 4 This is a top view of a testing device for valves in a hydraulic system, according to an embodiment of the present invention.

[0029] Explanation of reference numerals in the attached figures:

[0030] Frame 100; Oil inlet 110; Oil outlet 120;

[0031] First inspection station 200; First valve connection group 210; First oil inlet 211; First oil return port 212; First working oil port 213; Second working oil port 214;

[0032] Second inspection station 300; Second valve connection group 310;

[0033] Working oil circuit flow meter 410; inlet oil circuit flow meter 420; small flow meter 430; measuring cylinder 440; pressure sensor 450; pressure gauge 460;

[0034] Drive assembly 500; First motor 510; Second motor 520; Third motor 530;

[0035] First plate ball valve 610; Second plate ball valve 620 ； Third plate ball valve 630; Fourth plate ball valve 640; Fifth plate ball valve 650;

[0036] Pilot oil filter 710; pilot oil station 720; pilot oil circuit throttle valve 730;

[0037] First plate three-way ball valve 810; second plate three-way ball valve 820; first pressure relief throttle valve 830; second pressure relief throttle valve 840. Detailed Implementation

[0038] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0039] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0040] In the description of a utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. If the terms "first" and "second" are used, they are merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly specifying the number of indicated technical features or the order of the indicated technical features.

[0041] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.

[0042] Reference Figures 1 to 4 This utility model provides a testing device for valves in a hydraulic system, comprising: a first testing station 200, equipped with a first valve connection group 210; a second testing station 300, equipped with a second valve connection group 310; both the first valve connection group 210 and the second valve connection group 310 consist of multiple connection ports; the diameter of all connection ports in the first valve connection group 210 is larger than the diameter of all connection ports in the second valve connection group 310; and a testing component, which is connected to both the first valve connection group 210 and the second valve connection group 310. The detection assembly includes a working oil flow meter 410 and a pressure sensor 450. The working oil flow meter 410 is used to detect the flow rate of hydraulic oil flowing through the first valve connection group 210 or the second valve connection group 310, and the pressure sensor 450 is used to detect the pressure of hydraulic oil flowing through the first valve connection group 210 or the second valve connection group 310. The drive assembly 500 is connected to the working oil flow meter 410 through a pipeline to drive the hydraulic oil in the detection equipment to flow through the working oil flow meter 410 and then into the first valve connection group 210 or the second valve connection group 310.

[0043] Because the diameter of all connections in the first valve connection group 210 at the first testing station 200 is larger than the diameter of all connections in the second valve connection group 310 at the second testing station 300, valves with different diameters can be tested. Using the working oil flow meter 410 and pressure sensor 450, the flow rate and pressure of hydraulic oil flowing through the first valve connection group 210 or the second valve connection group 310 can be detected and collected. The collected pressure and flow rate data can then be used by a data processor to generate characteristic curves.

[0044] During testing, when testing large-diameter hydraulic system valves, the testing is performed at the first testing station 200. The valve to be tested is connected to the first valve connection group 210, and then all connection ports of the second valve connection group 310 are blocked. The drive assembly 500 is started, and the hydraulic oil in the testing equipment flows through the working oil circuit flow meter 410 and then into the first valve connection group 210. At this time, the hydraulic oil flowing through the first valve connection group 210 can be detected in real time through the working oil circuit flow meter 410 and the pressure sensor 450, thereby detecting the hydraulic oil flowing through the valve to be tested in real time and obtaining the test value of the valve to be tested, thus improving the testing efficiency and accuracy.

[0045] When it is necessary to test a small-diameter valve, the valve to be tested is connected to the second valve connection group 310 using the second testing station 300. Then, all connection ports of the first valve connection group 210 are blocked, and the above-mentioned start-up drive component 500 and subsequent operations are performed to complete the test.

[0046] Furthermore, the first valve connection group 210 includes a first oil inlet 211, a first oil return port 212, a first working oil port 213, and a second working oil port 214. Multiple pressure sensors 450 are respectively connected to the first oil inlet 211, the first oil return port 212, the first working oil port 213, and the second working oil port 214 through pipelines.

[0047] The hydraulic directional valve has four connection ports: P, T, A, and B. When the valve being tested is a hydraulic directional valve, the hydraulic directional valve is operated to connect P and A, and T and B. Then, the P port of the hydraulic directional valve is connected to the first inlet port 211, the T port is connected to the first return port 212, the A port is connected to the first working port 213, and the B port is connected to the second working port 214. At this time, the hydraulic directional valve and the testing equipment together form a hydraulic application circuit. The hydraulic oil flows sequentially through the first inlet port 211, the first working port 213, the second working port 214, and the first return port 212. The hydraulic oil pressure at the first inlet port 211, the first working port 213, the second working port 214, and the first return port 212 is measured by multiple pressure sensors 450 to obtain the pressure data of the four connection ports of the hydraulic directional valve.

[0048] In some applications, the testing equipment for hydraulic system valves also includes a frame 100, which is provided with an oil inlet 110 and an oil outlet 120. The oil inlet 110 is connected to a first oil inlet 211 through a pipe, and the hydraulic oil flowing in from the oil inlet 110 flows to the first oil inlet 211 through the pipe. The oil outlet 120 is connected to a first return oil outlet 212 through a pipe, and the hydraulic oil flowing in from the first oil inlet 211 flows to the oil outlet 120 through the pipe. Both the oil inlet 110 and the oil outlet 120 are connected to external oil circuits to provide sufficient hydraulic oil supply to the testing equipment.

[0049] Furthermore, the first testing station 200 is also equipped with a first plate ball valve 610, a second plate ball valve 620, a third plate ball valve 630, and a fourth plate ball valve 640. The first plate ball valve 610 is connected to the first oil inlet 211, the second plate ball valve 620 is connected to the first oil return port 212, the third plate ball valve 630 is connected to the first working oil port 213, and the fourth plate ball valve 640 is connected to the second working oil port 214. The four plate ball valves control the opening and closing of the four connection ports of the first valve connection group 210 respectively, which facilitates the connection or disconnection operation between the valve to be tested and the first valve connection group.

[0050] Furthermore, the end of the working oil flow meter 410 away from the drive assembly 500 is connected to the third plate ball valve 630 via a pipe, and the end of the drive assembly 500 away from the working oil flow meter 410 is connected to the fourth plate ball valve 640 via a pipe. When both the third plate ball valve 630 and the fourth plate ball valve 640 are open, the drive assembly 500 drives the hydraulic oil in the first working port 213 to flow through the working oil flow meter 410 and then to the second working port 214, so as to detect the flow rate of the hydraulic oil flowing through the first working port 213 and the second working port 214.

[0051] In some applications, the detection component also includes an inlet flow meter 420, which is installed on the connecting pipe between the first inlet 211 and the equipment inlet 110, and can detect the flow rate of hydraulic oil flowing into the first inlet 211.

[0052] Furthermore, the first testing station 200 also includes a fifth plate ball valve 650, the two ends of which are connected to the first oil return port 212 and the small flow meter 430 of the testing component respectively through pipelines.

[0053] When it is necessary to test the leakage of the hydraulic directional valve, return the hydraulic directional valve to its original position, disconnect all the connection ports of the hydraulic directional valve, close the second plate ball valve 620, and open the fifth plate ball valve 650. At this time, the first return port 212 is connected to the small flow meter 430. The leakage oil of the hydraulic directional valve flows from the first return port 212 to the small flow meter 430. The flow rate of the leakage oil of the hydraulic directional valve is detected by the small flow meter 430. Then, by comparing the standard values ​​of each parameter, it can be determined whether the hydraulic directional valve is qualified.

[0054] When it is necessary to test the leakage of the relief valve, connect the pressure end of the relief valve to the first inlet port 211 and the overflow end of the relief valve to the first return port 212. Open the first plate ball valve 610 and the fifth plate ball valve 650, and close the second plate ball valve 620, the third plate ball valve 630, and the fourth plate ball valve 640. At this time, the hydraulic oil flows from the first inlet port 211 to the pressure end of the relief valve, and the leakage oil of the relief valve flows from the first return port 212 to the small flow meter 430. The flow rate of the leakage oil of the relief valve is detected by the small flow meter 430. Then, by comparing the standard values ​​of each parameter, it can be determined whether the relief valve is qualified.

[0055] As a preferred embodiment, the first testing station 200 also includes a fifth plate-type ball valve 650. A first plate-type three-way ball valve 810 is installed above the first testing station 200. The two ends of the fifth plate-type ball valve 650 are connected via pipes to the first oil return port 212 and the oil inlet of the first plate-type three-way ball valve 810, respectively. The two oil outlets of the first plate-type three-way ball valve 810 are connected via pipes to the small flow meter 430 and the measuring cylinder 440 of the testing assembly, respectively. The first plate-type three-way ball valve 810 allows selection of whether the first oil return port 212 is connected to the small flow meter 430 or the measuring cylinder 440, thus enabling the selection of whether to use the small flow meter 430 or the measuring cylinder 440 to measure the leakage of the valve under test.

[0056] In some applications, the testing equipment also includes a pilot oil filter 710, a pilot oil station 720, and a pilot oil circuit throttle valve 730. The pilot oil station 720 is used to pump out pilot oil. The pilot oil station 720, pilot oil filter 710, and pilot oil circuit throttle valve 730 are sequentially connected to the first oil inlet 211 along the pilot oil delivery direction. After the valve under test is connected to the first valve connection group 210, pilot oil is supplied to the first oil inlet 211 to fill the entire valve under test, so as to promptly detect connection defects between the valve under test and the first valve connection group 210 and improve the safety of the testing operation.

[0057] According to some embodiments of this application, a pressure relief assembly is also included. This assembly includes a first pressure relief throttle valve 830 and a second pressure relief throttle valve 840. The first pressure relief throttle valve 830 is connected to a first working port 213 via a pipe, and the second pressure relief throttle valve 840 is connected to a second working port 214 via a pipe. When the valve under test needs to be disassembled after testing, the first pressure relief throttle valve 830 relieves pressure on the first working port 213, and the second pressure relief throttle valve 840 relieves pressure on the second working port 214, making the disassembly operation safer.

[0058] Furthermore, a pressure sensor 450 is connected to the pipeline between the first pressure relief throttle valve 830 and the first working port 213, and a pressure sensor 450 is also connected to the pipeline between the second pressure relief throttle valve 840 and the second working port 214. The pressure sensors 450 detect the hydraulic oil pressure at the first working port 213 and the second working port 214 respectively. Once the operator observes that the hydraulic oil pressure has dropped to a safe range, the valve under test can be disassembled, further improving the safety of valve disassembly and increasing disassembly efficiency.

[0059] According to some embodiments of this application, the drive assembly 500 includes a first motor 510, a second motor 520, and a third motor 530 with different power ratings. All three motors are connected to the working oil circuit flow meter 410 via pipes. By turning the motors on and off with different power ratings, hydraulic oil of different flow rates can be driven to flow through the working oil circuit flow meter 410 and then into the first valve connection group 210 or the second valve connection group 310, thereby detecting flow and pressure parameters under different flow conditions.

[0060] In some applications, a second plate-type three-way ball valve 820 is installed between the first detection station 200 and the second detection station 300. The second plate-type three-way ball valve 820 is installed on the connecting pipe between the drive assembly 500 and the working oil circuit flow meter 410. The outlet end of the second plate-type three-way ball valve 820 is connected to the working oil circuit flow meter 410 through a pipe. One of the inlet ends of the second plate-type three-way ball valve 820 is connected to the first motor 510 through a pipe, and the other inlet end of the second plate-type three-way ball valve 820 is connected to both the second motor 520 and the third motor 530.

[0061] When the second plate three-way ball valve 820 is connected to the first motor 510, the first motor 510 is opened, and the first motor 510 provides driving force to the hydraulic oil in the testing equipment; when the second plate three-way ball valve 820 is connected to the second motor 520 and the third motor 530, the second motor 520 is opened and the third motor 530 is closed, and the second motor 520 provides driving force to the hydraulic oil in the testing equipment; when the second plate three-way ball valve 820 is connected to the second motor 520 and the third motor 530, the third motor 530 is opened and the second motor 520 is closed, and the third motor 530 provides driving force to the hydraulic oil in the testing equipment.

[0062] By selecting the state of the second plate three-way ball valve 820 and opening or closing the first motor 510, the second motor 520, and the third motor 530, different driving forces can be provided to the hydraulic oil in the testing equipment, reducing the influence between the first motor 510, the second motor 520, and the third motor 530.

[0063] According to some embodiments of this application, both the first valve connection group 210 and the second valve connection group 310 are connected to a pressure gauge 460. The pressure gauge 460 displays the pressure values ​​of the first valve connection group 210 and the second valve connection group 310 in real time, providing a pressure detection method other than the digital signal of the pressure sensor 450, thereby improving work efficiency and safety.

[0064] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0065] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A testing device for valves in a hydraulic system, characterized in that, include: The first inspection station (200) is equipped with the first valve connection group (210). The second inspection station (300) is equipped with a second valve connection group (310). Both the first valve connection group (210) and the second valve connection group (310) consist of multiple connection ports; The diameter of all ports of the first valve connection group (210) is greater than the diameter of all ports of the second valve connection group (310); The detection component is connected to the first valve connection group (210) and the second valve connection group (310) respectively. The detection component includes a working oil flow meter (410) and a pressure sensor (450). The working oil flow meter (410) is used to detect the flow rate of hydraulic oil flowing through the first valve connection group (210) or the second valve connection group (310). The pressure sensor (450) is used to detect the pressure of hydraulic oil flowing through the first valve connection group (210) or the second valve connection group (310). The drive assembly (500) is connected to the working oil circuit flow meter (410) via a pipeline to drive the hydraulic oil in the detection device for hydraulic system valves to flow through the working oil circuit flow meter (410) and then into the first valve connection group (210) or the second valve connection group (310).

2. The testing equipment for hydraulic system valves according to claim 1, characterized in that, The first valve connection group (210) includes a first oil inlet (211), a first oil return port (212), a first working oil port (213), and a second working oil port (214). Multiple pressure sensors (450) are connected to the first oil inlet (211), the first oil return port (212), the first working oil port (213), and the second working oil port (214) respectively through pipelines.

3. The testing equipment for hydraulic system valves according to claim 2, characterized in that, The first detection station (200) is also equipped with a first plate ball valve (610), a second plate ball valve (620), a third plate ball valve (630) and a fourth plate ball valve (640). The first plate ball valve (610) is connected to the first oil inlet (211), the second plate ball valve (620) is connected to the first oil return port (212), the third plate ball valve (630) is connected to the first working oil port (213), and the fourth plate ball valve (640) is connected to the second working oil port (214).

4. The testing equipment for hydraulic system valves according to claim 3, characterized in that, The end of the working oil flow meter (410) away from the drive assembly (500) is connected to the third plate ball valve (630) through a pipe, and the end of the drive assembly (500) away from the working oil flow meter (410) is connected to the fourth plate ball valve (640) through a pipe. When both the third plate ball valve (630) and the fourth plate ball valve (640) are open, the drive assembly (500) drives the hydraulic oil in the first working oil port (213) to flow through the working oil flow meter (410) and then to the second working oil port (214).

5. A testing device for valves in a hydraulic system according to claim 4, characterized in that, The first detection station (200) also includes a fifth plate ball valve (650), the two ends of which are connected to the first oil return port (212) and the small flow meter (430) of the detection component respectively through pipelines.

6. The testing equipment for hydraulic system valves according to claim 4, characterized in that, The first detection station (200) also includes a fifth plate ball valve (650). A first plate three-way ball valve (810) is provided above the first detection station (200). The two ends of the fifth plate ball valve (650) are respectively connected to the first oil return port (212) and the oil inlet of the first plate three-way ball valve (810) through pipes. The two oil outlets of the first plate three-way ball valve (810) are respectively connected to the small flow meter (430) and the measuring cylinder (440) of the detection component through pipes.

7. A testing device for valves in a hydraulic system according to claim 2, characterized in that, It also includes a pressure relief assembly, which includes a first pressure relief throttle valve (830) and a second pressure relief throttle valve (840). The first pressure relief throttle valve (830) is connected to the first working port (213) through a pipeline, and the second pressure relief throttle valve (840) is connected to the second working port (214) through a pipeline.

8. A testing device for valves in a hydraulic system according to claim 7, characterized in that, The pressure sensor (450) is connected to the pipeline between the first pressure relief throttle valve (830) and the first working oil port (213), and the pressure sensor (450) is also connected to the pipeline between the second pressure relief throttle valve (840) and the second working oil port (214).

9. A testing device for valves in a hydraulic system according to claim 1, characterized in that, The drive assembly (500) includes a first motor (510), a second motor (520), and a third motor (530) with different power. The first motor (510), the second motor (520), and the third motor (530) are all connected to the working oil circuit flow meter (410) through pipes.

10. A testing device for valves in a hydraulic system according to claim 1, characterized in that, Both the first valve connection group (210) and the second valve connection group (310) are connected to pressure gauges (460).

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