CN116164012A - Hydraulic overflow valve test system - Google Patents
Hydraulic overflow valve test system Download PDFInfo
- Publication number
- CN116164012A CN116164012A CN202310148309.4A CN202310148309A CN116164012A CN 116164012 A CN116164012 A CN 116164012A CN 202310148309 A CN202310148309 A CN 202310148309A CN 116164012 A CN116164012 A CN 116164012A
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- valve
- oil
- communicated
- oil tank
- liquid
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- 238000012360 testing method Methods 0.000 title claims abstract description 70
- 239000007788 liquid Substances 0.000 claims abstract description 61
- 230000008878 coupling Effects 0.000 claims description 3
- 238000010168 coupling process Methods 0.000 claims description 3
- 238000005859 coupling reaction Methods 0.000 claims description 3
- 238000011056 performance test Methods 0.000 abstract description 3
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 239000003921 oil Substances 0.000 description 70
- 238000001914 filtration Methods 0.000 description 3
- 239000010720 hydraulic oil Substances 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 230000001052 transient effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B19/00—Testing; Calibrating; Fault detection or monitoring; Simulation or modelling of fluid-pressure systems or apparatus not otherwise provided for
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
- F15B1/02—Installations or systems with accumulators
- F15B1/04—Accumulators
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/04—Special measures taken in connection with the properties of the fluid
- F15B21/041—Removal or measurement of solid or liquid contamination, e.g. filtering
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Testing Of Devices, Machine Parts, Or Other Structures Thereof (AREA)
Abstract
A hydraulic overflow valve test system relates to a hydraulic overflow valve test device, and aims to solve the problem that the existing overflow valve performance test device is inconvenient to install and detach, and the test efficiency is low. The oil tank is communicated with a hydraulic pump, a liquid outlet of the hydraulic pump is communicated with an inlet of a one-way valve, the one-way valve is communicated with an electromagnetic reversing valve, a liquid outlet of the electromagnetic reversing valve is communicated with one end of a tested valve, the other end of the tested valve is communicated with one end of a throttle valve, the other end of the throttle valve is communicated with a liquid inlet of a heat exchanger, and a liquid outlet of the heat exchanger is communicated with an oil return port of the oil tank; the flowmeter is arranged on the pipeline of the tested valve and the throttle valve; the proportional overflow valve is communicated with the oil tank, and the other end of the proportional overflow valve is communicated with a pipeline between a liquid outlet of the hydraulic pump and an inlet of the one-way valve; the oil tank, the hydraulic pump, the tested valve and the heat exchanger are respectively arranged on the chassis; the chassis is arranged on the base in an inclined manner. The beneficial effects are that test efficiency is high.
Description
Technical Field
The invention relates to a hydraulic overflow valve test device.
Background
The hydraulic technology is widely applied in various fields, and is an essential working link for testing the performance of the hydraulic element for the research and development and production of the hydraulic element; the test system of the hydraulic overflow valve has a simple structure, only a basic valve group and a pipeline thereof are configured, and a flowmeter and a pressure gauge are not configured; some test systems have no relief valve or reversing valve even if they are configured with a flow meter and a pressure meter; some hydraulic pump stations are not configured, and the test can be performed only by connecting the hydraulic pump stations externally; therefore, the performance test of the existing overflow valve needs to be carried out on a plurality of devices, and can not be independently finished on one test device, so that the test requirement can not be met.
For the overflow valve which is suddenly required to leave the factory, various performance tests of steady state and transient state are indispensable, and if the overflow valve test system is single in function, the leaving efficiency of the overflow valve can be influenced, so that the requirements of the modern industry can not be met.
Disclosure of Invention
The invention aims to solve the problem that the existing overflow valve performance testing device is inconvenient to install and detach, so that the test efficiency is low, and provides a hydraulic overflow valve test system.
The invention relates to a hydraulic overflow valve test system, which comprises an oil tank, a hydraulic pump, a one-way valve, a proportional overflow valve, an electromagnetic directional valve, a base, a chassis, a throttle valve, a heat exchanger and a flowmeter;
the oil outlet of the oil tank is communicated with the liquid inlet of the hydraulic pump, the liquid outlet of the hydraulic pump is communicated with the inlet of the one-way valve, the outlet of the one-way valve is communicated with the liquid inlet of the electromagnetic reversing valve, the liquid outlet of the electromagnetic reversing valve is communicated with one end of the tested valve, the other end of the tested valve is communicated with one end of the throttle valve, the other end of the throttle valve is communicated with the liquid inlet of the heat exchanger, and the liquid outlet of the heat exchanger is communicated with the oil return port of the oil tank;
the flowmeter is arranged on a pipeline between the other end of the tested valve and one end of the throttle valve;
one end of the proportional overflow valve is communicated with the oil tank, and the other end of the proportional overflow valve is communicated with a pipeline between a liquid outlet of the hydraulic pump and an inlet of the one-way valve;
the oil tank, the hydraulic pump, the tested valve and the heat exchanger are respectively arranged on the chassis;
the chassis is arranged on the base in an inclined manner.
Further, the test system also comprises a motor, a coupler and a bell-type cover;
the driving shaft of the motor is rigidly connected with the rotating shaft of the hydraulic pump through a coupler;
the bell-shaped cover is arranged outside the coupler, one end of the bell-shaped cover is fixed on the motor through a flange, and the other end of the bell-shaped cover is connected to the hydraulic pump through a flange.
Further, the test system also comprises an oil absorption filter, an air filter and an oil return filter;
the front side wall of the oil outlet of the oil tank is provided with an oil suction filter which is arranged at the oil outlet of the oil tank;
the top end of the oil tank is provided with a vent hole, and the air filter is arranged at the vent hole of the oil tank;
the oil return port of the oil tank is positioned at the top end of the oil tank, and the oil return filter is arranged at the oil return port of the oil tank.
Further, the test system also comprises a liquid level thermometer;
the liquid level thermometer is arranged on the front side wall of the oil tank and is used for displaying the height of the liquid level in the oil tank and displaying the temperature of the liquid in the oil tank.
Further, the test system also comprises a thermometer, a first pressure gauge and a second pressure gauge;
the thermometer is arranged on a pipeline between a liquid outlet of the electromagnetic reversing valve and the tested valve and is used for measuring the temperature of liquid entering the tested valve;
the first pressure gauge is arranged on a pipeline between a liquid outlet of the electromagnetic reversing valve and the tested valve and is used for measuring the pressure of liquid entering the tested valve;
and the second pressure gauge is arranged on a pipeline between the tested valve and the throttle valve and is used for measuring the pressure of liquid flowing out of the tested valve.
Further, the test system also comprises an energy accumulator, a pressure relay and a stop valve;
the inlet and the outlet of the energy accumulator are communicated with a pipeline between the liquid outlet of the hydraulic pump and the inlet of the one-way valve;
the stop valve is arranged at an inlet and an outlet of the energy accumulator;
the pressure relay is arranged on a pipeline of an inlet and an outlet of the energy accumulator.
Further, the test system also comprises an oil leakage plate and an oil collecting groove;
the oil leakage plate is arranged on the chassis and is positioned right below the tested valve;
the oil collecting groove is arranged right below the lower side of the chassis and is positioned on the side wall of the base.
The beneficial effects of the invention are as follows: the hydraulic power source is formed by the arrangement of the oil tank and the hydraulic pump, and an external hydraulic pump station is not required, so that the testing efficiency is improved; meanwhile, the test system has small occupied space, and all parts in the test system are reasonably arranged, so that the test system is convenient to install, disassemble and maintain; the hydraulic principle is perfect, the testing content is wide, the tested valve (the tested overflow valve) is ensured to function normally, and the testing efficiency is high.
Drawings
FIG. 1 is a schematic perspective view of a hydraulic relief valve test system according to an embodiment;
fig. 2 is a hydraulic schematic diagram of a hydraulic relief valve test system according to an embodiment.
Detailed Description
The description is made of the hydraulic relief valve test system 1 according to the present embodiment with reference to fig. 1 and 2, which is characterized in that the test system includes an oil tank 1, a hydraulic pump 3, a check valve 4, a proportional relief valve 5, an electromagnetic directional valve 6, a base 8, a chassis 9, a throttle valve 13, a heat exchanger 14, and a flowmeter 15;
the oil outlet of the oil tank 1 is communicated with the liquid inlet of the hydraulic pump 3, the liquid outlet of the hydraulic pump 3 is communicated with the inlet of the one-way valve 4, the outlet of the one-way valve 4 is communicated with the liquid inlet of the electromagnetic directional valve 6, the liquid outlet of the electromagnetic directional valve 6 is communicated with one end of the tested valve 16, the other end of the tested valve 16 is communicated with one end of the throttle valve 13, the other end of the throttle valve 13 is communicated with the liquid inlet of the heat exchanger 14, and the liquid outlet of the heat exchanger 14 is communicated with the oil return port of the oil tank 1;
the flowmeter 15 is arranged on a pipeline between the other end of the tested valve 16 and one end of the throttle valve 13;
one end of the proportional overflow valve 5 is communicated with the oil tank 1, and the other end of the proportional overflow valve 5 is communicated with a pipeline between a liquid outlet of the hydraulic pump 3 and an inlet of the one-way valve 4;
the oil tank 1, the hydraulic pump 3, the tested valve 16 and the heat exchanger 14 are respectively arranged on the chassis 9;
the chassis 9 is arranged on the base 8 in an inclined manner; the chassis 9 is used to carry the test system.
In the present embodiment, the heat exchanger 14 is a brazed heat exchanger, which is disposed on the chassis 9 through a brazed heat exchanger mounting bracket, and the brazed heat exchanger is used for adjusting the temperature of hydraulic oil; the oil tank 1 and the hydraulic pump 3 form a power source; the proportional overflow valve 5 is used for adjusting the pressure of the test system; the electromagnetic directional valve 6 is used for controlling the flow rate passing through the valve 16 to be tested; the one-way valve 4 is used for preventing the backflow of hydraulic oil, and the one-way valve 4 is a 6-path one-way throttle valve, so that the installation and the connection are convenient; the flowmeter 15 is a gear flowmeter, the flowmeter 15 is used for testing the flow rate passing through the tested valve 16;
the test system further comprises a test bed, the valve 16 to be tested is arranged on the test bed, and the test bed is arranged on the chassis 9;
the drift diameter of the proportional overflow valve 5 is 10, and the pressure of the test system can be adjusted;
the diameter of the electromagnetic directional valve 6 is 10, and the electromagnetic directional valve is in a normally open state, and when the proportional overflow valve 5 performs transient step test, the electromagnetic directional valve is in a closed state, so that the flow of the test system is subjected to step change;
the throttle valve 13 is arranged below the test bench and used for adjusting the oil return flow of the test system, and can play a role in unloading when needed;
the diameter of the check valve 4 is 6, and the check valve 4 and the electromagnetic directional valve 6 share a valve block, so as to play a role in preventing the backflow of hydraulic oil.
In a preferred embodiment, the test system further comprises a motor 2, a coupling and a bell housing;
the driving shaft of the motor 2 is rigidly connected with the rotating shaft of the hydraulic pump 3 through a coupler;
the bell-shaped cover is arranged outside the coupling, one end of the bell-shaped cover is fixed on the motor 2 through a flange, and the other end of the bell-shaped cover is connected on the hydraulic pump 3 through a flange.
In the present embodiment, the motor 2 is disposed directly below the oil tank 1 in order to save space.
In a preferred embodiment, the test system further comprises an oil absorption filter 18, an air filter 19 and an oil return filter 20;
the front side wall of the oil outlet of the oil tank 1 is provided with an oil suction filter 18 which is arranged at the oil outlet of the oil tank 1;
the top end of the oil tank 1 is provided with a vent hole, and an air filter 19 is arranged at the vent hole of the oil tank 1;
the oil return port of the oil tank 1 is positioned at the top end of the oil tank, and the oil return filter 20 is arranged at the oil return port of the oil tank 1.
In this embodiment, the vent is used to ensure that the liquid in the tank 1 is air pressure balanced during circulation; the oil suction filter 18 is used for filtering liquid flowing out of the oil tank 1; the air filter 19 is used for filtering air entering the oil tank 1 and preventing external foreign matters from entering the oil tank 1; the oil return filter 20 is used for filtering liquid flowing back into the oil tank 1;
in a preferred embodiment, the test system further comprises a level thermometer 21;
the liquid level thermometer 21 is arranged on the front side wall of the oil tank 1, and the liquid level thermometer 21 is used for displaying the height of the liquid level in the oil tank 1 and displaying the temperature of the liquid in the oil tank 1.
In the preferred embodiment, the test system also includes a thermometer 22, a first gauge 12 and a second gauge 24;
the thermometer 22 is arranged on a pipeline between the liquid outlet of the electromagnetic directional valve 6 and the tested valve 16, and the thermometer 22 is used for measuring the temperature of liquid entering the tested valve 16;
the first pressure gauge 12 is arranged on a pipeline between the liquid outlet of the electromagnetic directional valve 6 and the tested valve 16, and the first pressure gauge 12 is used for measuring the pressure of liquid entering the tested valve 16;
the second pressure gauge 24 is arranged on a pipeline between the tested valve 16 and the throttle valve 13, and the second pressure gauge 24 is used for measuring the pressure of liquid flowing out of the tested valve 16.
In this embodiment, the first pressure gauge 12 and the second pressure gauge 24 are both disposed on the test bench, and are used for testing the inlet and outlet pressures of the valve under test 16, respectively.
In a preferred embodiment, the test system further comprises an accumulator 7, a pressure relay 23 and a shut-off valve 25;
the inlet and the outlet of the accumulator 7 are communicated with a pipeline between the liquid outlet of the hydraulic pump 3 and the inlet of the one-way valve 4;
the stop valve 25 is arranged at the inlet and outlet of the accumulator 7;
the pressure relay 23 is arranged on the pipeline of the inlet and outlet of the accumulator 7.
In the present embodiment, the pressure relay 7 is used to test the pressure value of the proportional relief valve 5, and the accumulator 7 and the shut-off valve 25 are provided to absorb pressure shocks for the test system.
In a preferred embodiment, the test system further comprises an oil leakage plate 10 and an oil sump 11;
the oil leakage plate 10 is arranged on the chassis 9 and is positioned right below the tested valve 16;
the oil sump 11 is arranged right under the lower side of the chassis 9 and on the side wall of the base 8.
In the present embodiment, the oil leakage plate 10 and the oil sump 11 are provided, so that the liquid leaked from the test system can be easily collected.
The foregoing is merely illustrative of the present invention, and the present invention is not limited thereto, and any person skilled in the art will readily recognize that variations or substitutions are within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (7)
1. The hydraulic overflow valve test system is characterized by comprising an oil tank (1), a hydraulic pump (3), a one-way valve (4), a proportional overflow valve (5), an electromagnetic directional valve (6), a base (8), a chassis (9), a throttle valve (13), a heat exchanger (14) and a flowmeter (15);
the oil outlet of the oil tank (1) is communicated with the liquid inlet of the hydraulic pump (3), the liquid outlet of the hydraulic pump (3) is communicated with the inlet of the one-way valve (4), the outlet of the one-way valve (4) is communicated with the liquid inlet of the electromagnetic reversing valve (6), the liquid outlet of the electromagnetic reversing valve (6) is communicated with one end of the tested valve (16), the other end of the tested valve (16) is communicated with one end of the throttle valve (13), the other end of the throttle valve (13) is communicated with the liquid inlet of the heat exchanger (14), and the liquid outlet of the heat exchanger (14) is communicated with the oil return port of the oil tank (1);
the flowmeter (15) is arranged on a pipeline between the other end of the tested valve (16) and one end of the throttle valve (13);
one end of the proportional overflow valve (5) is communicated with the oil tank (1), and the other end of the proportional overflow valve (5) is communicated with a pipeline between a liquid outlet of the hydraulic pump (3) and an inlet of the one-way valve (4);
the oil tank (1), the hydraulic pump (3), the tested valve (16) and the heat exchanger (14) are respectively arranged on the chassis (9);
the chassis (9) is arranged on the base (8) in an inclined manner.
2. A hydraulic relief valve testing system according to claim 1, characterized in that the testing system further comprises a motor (2), a coupling and a bell;
the driving shaft of the motor (2) is rigidly connected with the rotating shaft of the hydraulic pump (3) through a coupler;
the bell-shaped cover is arranged outside the coupler, one end of the bell-shaped cover is fixed on the motor (2) through a flange, and the other end of the bell-shaped cover is connected on the hydraulic pump (3) through a flange.
3. A hydraulic relief valve testing system according to claim 1, characterized in that the testing system further comprises an oil suction filter (18), an air filter (19) and an oil return filter (20);
an oil outlet of the oil tank (1) is formed in the front side wall of the oil outlet, and an oil suction filter (18) is arranged at the oil outlet of the oil tank (1);
the top end of the oil tank (1) is provided with a vent hole, and an air filter (19) is arranged at the vent hole of the oil tank (1);
the oil return port of the oil tank (1) is positioned at the top end of the oil tank, and the oil return filter (20) is arranged at the oil return port of the oil tank (1).
4. A hydraulic relief valve testing system according to claim 1, characterized in that the testing system further comprises a liquid level thermometer (21);
the liquid level thermometer (21) is arranged on the front side wall of the oil tank (1), and the liquid level thermometer (21) is used for displaying the height of the liquid level in the oil tank (1) and the temperature of the liquid in the oil tank (1).
5. The hydraulic relief valve test system of claim 1, further comprising a thermometer (22), a first gauge (12) and a second gauge (24);
the thermometer (22) is arranged on a pipeline between a liquid outlet of the electromagnetic directional valve (6) and the tested valve (16), and the thermometer (22) is used for measuring the temperature of liquid entering the tested valve (16);
the first pressure gauge (12) is arranged on a pipeline between a liquid outlet of the electromagnetic reversing valve (6) and the tested valve (16), and the first pressure gauge (12) is used for measuring the pressure of liquid entering the tested valve (16);
the second pressure gauge (24) is arranged on a pipeline between the tested valve (16) and the throttle valve (13), and the second pressure gauge (24) is used for measuring the pressure of liquid flowing out of the tested valve (16).
6. A hydraulic spill valve testing system according to claim 1, characterized in that the testing system further comprises an accumulator (7), a pressure relay (23) and a shut-off valve (25);
the inlet and the outlet of the energy accumulator (7) are communicated with a pipeline between the liquid outlet of the hydraulic pump (3) and the inlet of the one-way valve (4);
the stop valve (25) is arranged at the inlet and the outlet of the energy accumulator (7);
the pressure relay (23) is arranged on a pipeline of an inlet and an outlet of the energy accumulator (7).
7. A hydraulic spill valve testing system according to claim 1, characterized in that the testing system further comprises an oil leakage plate (10) and an oil sump (11);
the oil leakage plate (10) is arranged on the chassis (9) and is positioned right below the tested valve (16);
the oil collecting groove (11) is arranged right below the lower side of the chassis (9) and is positioned on the side wall of the base (8).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310148309.4A CN116164012A (en) | 2023-02-21 | 2023-02-21 | Hydraulic overflow valve test system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310148309.4A CN116164012A (en) | 2023-02-21 | 2023-02-21 | Hydraulic overflow valve test system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116164012A true CN116164012A (en) | 2023-05-26 |
Family
ID=86419651
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310148309.4A Pending CN116164012A (en) | 2023-02-21 | 2023-02-21 | Hydraulic overflow valve test system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116164012A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN210461208U (en) * | 2019-08-26 | 2020-05-05 | 天津格特斯检测设备技术开发有限公司 | High-frequency pulse impact pressure test system |
| CN111810494A (en) * | 2020-08-03 | 2020-10-23 | 常州精瑞自动化装备技术有限公司 | Hydraulic test bench for automobile solenoid valve |
| CN112762054A (en) * | 2021-01-14 | 2021-05-07 | 哈尔滨工业大学 | Comprehensive hydraulic valve performance test system |
| CN114235380A (en) * | 2021-11-30 | 2022-03-25 | 河南航天液压气动技术有限公司 | Low-pressure large-flow overflow valve test system and test method thereof |
| CN216666097U (en) * | 2021-11-30 | 2022-06-03 | 上海诺格智能系统工程有限公司 | Balance valve delivery test bed |
-
2023
- 2023-02-21 CN CN202310148309.4A patent/CN116164012A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN210461208U (en) * | 2019-08-26 | 2020-05-05 | 天津格特斯检测设备技术开发有限公司 | High-frequency pulse impact pressure test system |
| CN111810494A (en) * | 2020-08-03 | 2020-10-23 | 常州精瑞自动化装备技术有限公司 | Hydraulic test bench for automobile solenoid valve |
| CN112762054A (en) * | 2021-01-14 | 2021-05-07 | 哈尔滨工业大学 | Comprehensive hydraulic valve performance test system |
| CN114235380A (en) * | 2021-11-30 | 2022-03-25 | 河南航天液压气动技术有限公司 | Low-pressure large-flow overflow valve test system and test method thereof |
| CN216666097U (en) * | 2021-11-30 | 2022-06-03 | 上海诺格智能系统工程有限公司 | Balance valve delivery test bed |
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Application publication date: 20230526 |