CN111272414A - High-pressure valve life test device - Google Patents
High-pressure valve life test device Download PDFInfo
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- CN111272414A CN111272414A CN202010236556.6A CN202010236556A CN111272414A CN 111272414 A CN111272414 A CN 111272414A CN 202010236556 A CN202010236556 A CN 202010236556A CN 111272414 A CN111272414 A CN 111272414A
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- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
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Abstract
The invention relates to a high-pressure valve life test device.A tested valve which is electrically driven is placed in a high-pressure simulation container, a torque sensor is arranged between the tested valve and an electric driving head, a strain gauge is arranged on the valve body, and the tested valve is connected with a valve internal pressure output system and is used for simulating internal pressure load born by the inner wall of the valve body in the opening and closing process of the tested valve; the high-pressure simulation container is connected with the valve external pressure output system and is used for simulating the external pressure load of the outer wall of the tested valve under the condition of deep sea high-pressure environment; the collection, storage and control system is connected with the torque sensor, the strain gauge, the electrically-driven valve to be measured, the valve internal pressure output system and the pressure transmitter and is used for respectively controlling and realizing automatic opening and closing of the electrically-driven valve to be measured, internal pressure load, external pressure load and internal and external simultaneous pressure load are applied to the electrically-driven valve to be measured, and fatigue life test of the electrically-driven valve to be measured under the action of dynamic pressure load is realized.
Description
Technical Field
The invention relates to a deep sea high-pressure valve testing device, in particular to a high-pressure valve service life testing device.
Background
At present, a great deal of research has been carried out at home and abroad aiming at the conventional valve service life testing technology, and various service life testing devices or platforms are also designed, so that a set of complete testing method for checking the service life index of the valve is formed. Particularly, in the aspect of the service life test of the marine valve under the static pressure environment condition, China already establishes a corresponding test standard CB/T339793 static pressure service life test of the marine valve. However, the method is still insufficient in the aspect of research on the life test technology of the high-pressure valve, and especially the research on the life test technology of the high-pressure valve under the comprehensive action of factors such as high water pressure, water pressure pulsation, valve cavitation and the like is basically blank. So far, no effective test method for evaluating the service life of the high-pressure valve is formed, no existing test standard can be referred to, and a dynamic pressure service life test device of the high-pressure valve is basically blank.
Disclosure of Invention
The invention aims to provide a high-pressure valve service life testing device, which aims to solve the problems that the current related testing device is blank, and a high-pressure valve service life testing method and an evaluation standard are not sufficient. By utilizing the device, the internal pressure and external pressure service life test of the high-pressure valve can be carried out, the automatic operation of opening and closing the high-pressure valve is realized, the key performance parameters of the valve are monitored in real time, the measured data can be automatically stored and classified, and the high-pressure valve service life test device can provide basic and effective data for carrying out reliability service life evaluation analysis of the high-pressure valve based on the degradation data.
In order to achieve the purpose, the technical scheme of the invention is as follows: a high-pressure valve service life test device comprises a high-pressure simulation container, a valve internal pressure output system, a valve external pressure output system, a signal acquisition, storage and control system and a gas-liquid pipeline, wherein an electrically driven valve to be tested is placed in the high-pressure simulation container, and a torque sensor is arranged between the valve to be tested and an electrically driven head and used for measuring the opening and closing torque of the valve; a valve body of the measured valve is provided with a strain gauge for measuring the structural deformation of the valve; the tested valve is connected with the valve internal pressure output system and is used for simulating the internal pressure load on the inner wall of the valve body in the opening and closing process of the tested valve; the high-pressure simulation container is connected with the valve external pressure output system and is used for simulating the external pressure load of the outer wall of the tested valve under the condition of deep sea high-pressure environment; the pressure transmitter in the valve external pressure output system is used for respectively controlling and realizing the automatic opening and closing of the electrically-driven valve to be measured, so that the pressure load of the electrically-driven valve to be measured is automatically pressurized and decompressed according to requirements, the internal pressure load, the external pressure load and the internal and external simultaneous pressure loads are applied to the electrically-driven valve to be measured, and the fatigue life test of the electrically-driven valve to be measured under the action of the dynamic pressure load is realized.
Further, the valve internal pressure output system is composed of a pressure transmitter, a throttle valve, a liquid booster pump, an air source electromagnetic valve, an air source pressure gauge, an air source regulating valve, a pneumatic water injection pump, a manual pressure relief valve and a pneumatic pressure relief valve, wherein the liquid inlet end of the valve to be measured is connected with the pressure transmitter through a hydraulic pipeline, the liquid inlet end of the valve to be measured is connected with a liquid tank through the liquid booster pump, the pneumatic water injection pump and a filter, and the air inlet end of the liquid booster pump is connected with a compressed air inlet through the air source electromagnetic valve, the air source regulating; the air inlet end of the pneumatic water injection pump is connected with a compressed air inlet through an air source electromagnetic valve, an air source ball valve and a filter; the other path is connected with a liquid tank through a manual pressure relief valve; the liquid outlet end of the valve to be measured is connected with a pressure transmitter through a hydraulic pipeline, and the pressure transmitter is connected with a liquid tank through a throttle valve.
Further, valve external pressure output system comprises pressure transmitter, relief valve, pneumatic water injection valve, liquid booster pump, air supply solenoid valve, air supply manometer, air supply governing valve, liquid booster pump feed liquor end passes through the filter and connects the liquid case, and it is inside that the liquid end passes through pressure transmitter, relief valve connection high pressure simulation container, and the liquid case is still connected through pneumatic water injection valve to high pressure simulation container inside, and liquid booster pump inlet end passes through air supply solenoid valve, air supply governing valve, air supply ball valve, filter and connects the compressed air entry.
Further, collection, storage and control system comprises touch-sensitive screen, PLC controller, collection module, storage module, the PLC controller is connected touch-sensitive screen, storage module, collection module respectively, storage module is used for realizing long-time automatic preprocessing and the storage of measured data, and connect the printer for pass through the printer with measured data and print the test report.
Furthermore, an alarm module is arranged in the PLC and used for alarming the abnormal pressure of the inlet and outlet of the valve to be measured, alarming the abnormal pressure of the high-pressure simulation container, alarming the abnormal origin pressure gauge and alarming the abnormal opening and closing moment of the valve to be measured.
Further, the high-pressure simulation container comprises a cylinder body and an end cover, wherein a pressure relief hole is reserved at the bottom of the cylinder body and used for discharging liquid in the container when a test is finished; the side part of the cylinder body is of an arc structure, a pressure pressurization pipeline interface and five through holes are arranged on the end cover, and the five through holes are respectively used for connecting a valve internal pressure input pipeline, a valve internal pressure output pipeline, a valve external pressure input pipeline, a valve external pressure output pipeline and the connection between the valve and an electric driving head thereof.
Further, a pressure relief hole in the bottom of the high-pressure simulation container is connected with the water receiving tank through a manual drain valve.
The invention has the beneficial effects that:
the invention mainly comprises a high-pressure simulation container, a valve internal pressure output system, a valve external pressure output system, a signal acquisition, storage and control system and a gas-liquid pipeline. The fatigue life test of the high-pressure valve under the action of high pressure inside the valve body, the action of high pressure on the outer wall of the valve body and the action of internal and external pressure of the valve can be respectively carried out by utilizing the device. In the fatigue life test process, a signal acquisition, storage and control system in the device can monitor and collect key performance parameters of high-pressure valves such as opening and closing torque, inlet and outlet pressure, structural strain, leakage quantity and the like. The acquired and stored high-pressure valve key performance parameter data can provide basic data for carrying out high-pressure valve fatigue life assessment.
The invention realizes the automatic opening and closing of the valve and the automatic pressurization and pressure relief of the pressure load according to the requirements through the PLC control; by designing the data storage module, long-time automatic preprocessing and storage of the measured data can be realized; the internal pressure load, the external pressure load and the internal and external simultaneous pressure loads can be applied to the high-pressure valve, and the fatigue life test of the high-pressure valve under the action of the dynamic pressure load is realized; by utilizing the service life device and various safety alarm devices thereof, unmanned, high-efficiency and long-term stable operation in the service life test process can be realized.
Drawings
FIG. 1 is a system diagram of a high pressure valve life test apparatus of the present invention;
in the figure: 1. the system comprises a tested electric drive valve 1a, a valve 1b, an electric drive head 1c, a torque sensor 1d, a strain gauge 2, a high-pressure simulation container 2a, a manual drain valve 2b, a water receiving tank 3 and a signal acquisition, storage and control system; 4. the device comprises a pressure transmitter, 5, a safety valve, 6, a pneumatic water injection valve, 7, a throttle valve, 8, a liquid booster pump, 9, an air source electromagnetic valve, 10, an air source pressure gauge, 11, an air source regulating valve, 12, a pneumatic water injection pump, 13, an air source ball valve, 14, a manual pressure relief valve, 15, a pneumatic pressure relief valve, 16, a filter, 17, a liquid tank, 18 and a compressed air inlet, wherein a thick solid line represents a high-pressure pipeline, a thin solid line represents a low-pressure pipeline, a thick dotted line represents an air source pipeline, a thin dotted line represents an electric line, and a dot-dash line represents;
FIG. 2 is a schematic diagram of a high pressure simulation vessel;
wherein: (a) a front cross-sectional view, (b) a top end cover view;
2c is the barrel, 2d is the end cover, 2e is fixing bolt, 2f is the round pin axle, 2g is O type circle, 2h is the interior pressure input interface of valve, 2i is the interior pressure output interface of valve, 2j is the external pressure input interface of valve, 2k is the external pressure output interface of valve, 2l is valve and electric drive head connection interface.
Detailed Description
The embodiments of the present invention will be further explained with reference to the drawings.
As shown in fig. 1, the high-pressure valve service life testing device provided by the invention comprises a tested valve 1, a high-pressure simulation container 2, a valve internal pressure output system, a valve external pressure output system, a signal acquisition, storage and control system 3, a gas-liquid pipeline and the like. The tested valve 1 is an electrically driven valve, and can realize automatic opening and closing actions; a valve 1a of an electrically driven valve is arranged in a high-pressure simulation container 2, and a torque sensor 1c is arranged between the valve 1a and an electrically driven head 1b of the electrically driven valve and is used for measuring the opening and closing moment of the valve; and a strain gauge 1d is arranged at the key position of the valve body of the valve 1a and is used for measuring the structural deformation of the valve. The valve internal pressure output system mainly comprises a pressure transmitter 4, a throttle valve 7, a liquid booster pump 8, an air source electromagnetic valve 9, an air source pressure gauge 10, an air source regulating valve 11, a pneumatic water injection pump 12, a manual pressure relief valve 14, a pneumatic pressure relief valve 15 and other parts, and is used for simulating the internal pressure load of the inner wall of the valve body in the opening and closing process of the valve. Wherein, the liquid inlet end of the valve 1a is connected with a pressure transmitter 4 through a hydraulic pipeline, and then the liquid inlet end of the valve passes through a liquid booster pump 8, a pneumatic water injection pump 12 and a filter 16 and is connected with a liquid tank 17, and the gas inlet end of the liquid booster pump 8 is connected with a compressed air inlet 18 through a gas source electromagnetic valve 9, a gas source regulating valve 11, a gas source ball valve 13 and the filter 16; the air inlet end of the pneumatic water injection pump 12 is connected with a compressed air inlet 18 through an air source electromagnetic valve 9, an air source ball valve 13 and a filter 16; the other path is connected with a liquid tank 17 through a manual pressure relief valve 14; the liquid outlet end of the valve 1a is connected with a pressure transmitter 4 through a hydraulic pipeline, and the pressure transmitter 4 is connected with a liquid tank 17 through a throttle valve 7.
The invention also designs a connecting bracket between the high-pressure valve body and the electric drive head, so that the high-pressure valve is ensured to be arranged on the end cover of the high-pressure container in a sealing way, the rolling friction between the valve rod and the end cover is ensured in the opening and closing process of the high-pressure valve, and the sealing of the friction surface is kept without leakage.
The valve external pressure output system is mainly composed of a pressure transmitter 4, a safety valve 5, a pneumatic water injection valve 6, a liquid booster pump 8, an air source electromagnetic valve 9, an air source pressure gauge 10, an air source regulating valve 11 and other parts, and simulates external pressure load of the outer wall of the valve under the condition of deep sea high-pressure environment. Wherein, the liquid inlet end of the liquid booster pump 8 is connected with the liquid tank 17 through the filter 16, the liquid outlet end is connected with the inside of the high-pressure simulation container 2 through the pressure transmitter 4 and the safety valve 5, the inside of the high-pressure simulation container 2 is also connected with the liquid tank 17 through the pneumatic water injection valve 6, and the gas inlet end of the liquid booster pump 8 is connected with the compressed air inlet 18 through the gas source electromagnetic valve 9, the gas source regulating valve 11, the gas source ball valve 13 and the filter 16.
As shown in fig. 2(a), (b), the high-pressure simulation container 2 includes a cylinder 2c, an end cap 2d, a fixing bolt 2e, a pin 2f, and an O-ring 2 g. The container wall thickness should be large enough to ensure that it is safe and reliable during the application of pressure loads. A pressure relief hole is reserved at the bottom of the cylinder body 2c and used for discharging liquid in the container after the test is finished; the side part of the cylinder body 2c is of an arc structure, and all pressure pressurization pipeline interfaces are arranged on the end cover 2d for convenience in installation; the total number of the through holes on the end cover 2d is 5, wherein the hole 2h is used for connecting the valve internal pressure input pipeline, the hole 2i is used for connecting the valve internal pressure output pipeline, the hole 2j is used for connecting the valve external pressure input pipeline, the hole 2k is used for connecting the valve external pressure output pipeline, and the hole 2l is used for connecting the valve and the electric drive head thereof. The bottom of the high-pressure simulation container 2 is connected with a water receiving tank 2b through a manual drain valve 2 a.
The acquisition, storage and control system 3 mainly comprises a touch screen, a PLC (programmable logic controller), acquisition software, acquisition hardware and the like. The acquisition, storage and control system 3 is respectively connected with three pressure transmitters 4, a torque sensor 1c and a strain gauge 1 d. Before testing, parameters such as test pressure, pressure maintaining time, emptying time and the like can be set on test software according to test requirements, testing is started by one key after parameter setting is completed, the system automatically completes the whole testing process according to the set parameters, manual intervention is not needed in the testing process, and the system automatically relieves pressure after the testing is completed. In the testing process, key performance parameters of the valve, such as pressure at an inlet and an outlet of the valve, opening and closing moment of the valve, structural strain and the like, can be measured, and the acquired data can be temporarily or permanently stored. In the testing process, the opening and closing frequency of the valve can be set, degradation trend data of key performance parameters of the valve under different opening and closing frequencies (acceleration factors) are collected, the degradation characteristics of the key performance parameters are obtained through statistical analysis, and basic data can be provided for building a high-pressure valve (acceleration) service life testing model. The control system software can carry out functions of sorting, classifying, displaying, basic operation and the like on the test data.
The acquisition, storage and control system 3 also has the function of compiling test reports, and can also store, print and the like in a document form. The PLC is internally provided with an alarm function and can take test stopping measures in time, and the alarm functions comprise valve inlet and outlet pressure abnormity alarm, high-pressure container pressure abnormity alarm, origin pressure gauge abnormity alarm and valve opening and closing moment abnormity alarm.
The gas-liquid pipeline comprises a high-pressure pipeline, a low-pressure pipeline, a gas source pipeline, a pressure relief pipeline and the like, wherein the high-pressure pipeline adopts a double-clamping sleeve sealing mode. When the pipe valve is connected with a pipe, the pipeline is inserted into the clamping sleeve connector, the front clamping sleeve is pushed into the connector body to form main seal with the pipeline, and the rear clamping sleeve inwards generates a hinge effect to firmly grasp the pipeline. The geometry of the rear ferrule facilitates the formation of a ferrule action that translates axial movement into radial compression on the tubing requiring a small assembly torque to operate. Finally, the rear clamping sleeve is stressed to slightly deform and clamp the outer wall of the pipeline, and the front clamping sleeve forms a main sealing surface to ensure effective sealing of high-pressure fluid.
One part of liquid in the liquid tank of the high-pressure valve service life test device returns to the liquid tank in a closed loop through a valve internal pressure output system, a tested valve 1, various high-pressure and low-pressure pipelines and the like, and the other part returns to the liquid tank in a closed loop through a valve external pressure output system, a high-pressure simulation container 2, various high-pressure and low-pressure pipelines and the like. The whole water supply system of the device presents a closed-loop pipeline, so that closed-loop and recycling of oil are realized, and the resources are greatly saved while the test efficiency is improved.
When the high-pressure valve service life test device is used for checking the service life index of the high-pressure valve, the high-pressure valve service life test device needs to continuously run for a long time, so that the reliability and the stability of the device have direct influence on the realization of a high-precision and high-efficiency service life test. Therefore, the technical means adopted by the invention comprises the following steps: 1) the adopted liquid and gas are treated by corresponding filters, so that the phenomenon of component failure caused by media is avoided; 2) the similar high-reliability device is selected for the electrical accessories with obviously low reliability indexes in the device; 3) all pipelines adopt high-pressure-resistant hard pipes, so that the pressure maintaining function of the system under a high-pressure condition is still effective; 4) the rubber pad, the O-shaped ring and other vulnerable parts in the device are replaced regularly.
The device can be used for carrying out the service life test of the high-pressure valve under the action of internal pressure or (and) external pressure. The test procedure was as follows: 1) before testing, putting the product into a high-pressure simulation container serving as a test cabin, accessing a test interface and closing a protective window; 2) switching on a power supply and an air source, and opening test software; 3) after parameters such as water injection time, test pressure, pressure maintaining time and the like are set, starting by one key. The system automatically injects a test medium into a product and boosts the pressure to a set value; 5) when the pressure is increased to a set value, the pressurization is automatically stopped for pressure maintaining, the valve starts to open and close, the life test starts, and the opening and closing frequency of the valve is arbitrarily set according to the requirements of the test method; 6) when any index of key performance parameters such as leakage quantity, inlet and outlet pressure, structural stress, hand wheel moment and the like of the electric stop valve exceeds a specified range (failure criterion or failure threshold), representing valve failure, and recording the pressure stress and fatigue life of the electric stop valve; 7) collecting life test data (environmental stress level and fatigue life or opening and closing times of the electric stop valve under the stress level) and providing basic data for evaluating the reliability life of the high-pressure valve in the later period; 8) and after the test is finished, the system automatically releases the pressure and stops, and after the pressure is released, the protection window is opened to take out the product to finish the test.
The invention is not limited to the above-described examples, and various modifications and changes which can be made by those skilled in the art without inventive work within the scope of the present invention defined by the claims are protected by the patent.
Claims (7)
1. The utility model provides a high-pressure valve life test device, includes high pressure simulation container, the interior pressure output system of valve, valve external pressure output system, signal acquisition, storage and control system and gas-liquid pipeline, its characterized in that: an electrically driven valve to be tested is placed in the high-pressure simulation container, and a torque sensor is arranged between the valve to be tested and the electric driving head and used for measuring the opening and closing moment of the valve; a valve body of the measured valve is provided with a strain gauge for measuring the structural deformation of the valve; the tested valve is connected with the valve internal pressure output system and is used for simulating the internal pressure load on the inner wall of the valve body in the opening and closing process of the tested valve; the high-pressure simulation container is connected with the valve external pressure output system and is used for simulating the external pressure load of the outer wall of the tested valve under the condition of deep sea high-pressure environment; the pressure transmitter in the valve external pressure output system is used for respectively controlling and realizing the automatic opening and closing of the electrically-driven valve to be measured, so that the pressure load of the electrically-driven valve to be measured is automatically pressurized and decompressed according to requirements, the internal pressure load, the external pressure load and the internal and external simultaneous pressure loads are applied to the electrically-driven valve to be measured, and the fatigue life test of the electrically-driven valve to be measured under the action of the dynamic pressure load is realized.
2. The high pressure valve life test apparatus of claim 1, wherein: the valve internal pressure output system consists of a pressure transmitter, a throttle valve, a liquid booster pump, an air source electromagnetic valve, an air source pressure gauge, an air source regulating valve, a pneumatic water injection pump, a manual pressure relief valve and a pneumatic pressure relief valve, wherein the liquid inlet end of the tested valve is connected with the pressure transmitter through a hydraulic pipeline, the liquid tank is connected with the pneumatic water injection pump through a filter and the liquid booster pump in the back, and the air inlet end of the liquid booster pump is connected with a compressed air inlet through the air source electromagnetic valve, the air source regulating valve, the air source ball valve and the filter; the air inlet end of the pneumatic water injection pump is connected with a compressed air inlet through an air source electromagnetic valve, an air source ball valve and a filter; the other path is connected with a liquid tank through a manual pressure relief valve; the liquid outlet end of the valve to be measured is connected with a pressure transmitter through a hydraulic pipeline, and the pressure transmitter is connected with a liquid tank through a throttle valve.
3. The high pressure valve life test apparatus of claim 1, wherein: the valve external pressure output system is composed of a pressure transmitter, a safety valve, a pneumatic water injection valve, a liquid booster pump, an air source electromagnetic valve, an air source pressure gauge and an air source adjusting valve, wherein the liquid inlet end of the liquid booster pump is connected with a liquid tank through a filter, the liquid outlet end of the liquid booster pump is connected with the inside of a high-pressure simulation container through the pressure transmitter and the safety valve, the inside of the high-pressure simulation container is connected with the liquid tank through the pneumatic water injection valve, and the air inlet end of the liquid booster pump is connected with a compressed air inlet through the air source.
4. The high pressure valve life test apparatus of claim 1, wherein: the collection, storage and control system is composed of a touch screen, a PLC (programmable logic controller), an acquisition module and a storage module, the PLC is respectively connected with the touch screen, the storage module and the acquisition module, the storage module is used for realizing long-time automatic preprocessing and storage of measurement data and is connected with a printer and used for printing a test report on the measurement data through the printer.
5. The high pressure valve life test apparatus of claim 4, wherein: and the PLC is internally provided with an alarm module for alarming the pressure abnormity of the inlet and outlet of the valve to be tested, alarming the pressure abnormity of the high-pressure simulation container, alarming the abnormity of the origin pressure gauge and alarming the abnormal opening and closing moment of the valve to be tested.
6. The high pressure valve life test apparatus of claim 1, wherein: the high-pressure simulation container comprises a cylinder body and an end cover, wherein a pressure relief hole is reserved at the bottom of the cylinder body and used for discharging liquid in the container after a test is finished; the side part of the cylinder body is of an arc structure, a pressure pressurization pipeline interface and five through holes are arranged on the end cover, and the five through holes are respectively used for connecting a valve internal pressure input pipeline, a valve internal pressure output pipeline, a valve external pressure input pipeline, a valve external pressure output pipeline and the connection between the valve and an electric driving head thereof.
7. The high pressure valve life test apparatus of claim 6, wherein: and the pressure relief hole at the bottom of the high-pressure simulation container is connected with the water receiving tank through a manual drain valve.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010236556.6A CN111272414A (en) | 2020-03-30 | 2020-03-30 | High-pressure valve life test device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010236556.6A CN111272414A (en) | 2020-03-30 | 2020-03-30 | High-pressure valve life test device |
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| CN202010236556.6A Pending CN111272414A (en) | 2020-03-30 | 2020-03-30 | High-pressure valve life test device |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112362494A (en) * | 2020-10-15 | 2021-02-12 | 中国特种设备检测研究院 | Hydraulic bulging test system |
| CN112924167A (en) * | 2021-04-22 | 2021-06-08 | 青岛海洋工程水下设备检测有限公司 | System for testing internal pressure and external pressure of underwater hydraulic valve and experimental method |
| CN112924168A (en) * | 2021-04-22 | 2021-06-08 | 青岛海洋工程水下设备检测有限公司 | System for testing internal pressure and external pressure of underwater manual valve and experimental method |
| CN113027832A (en) * | 2021-03-05 | 2021-06-25 | 浙江省泵阀产品质量检验中心（永嘉县质量技术监督检测研究院） | Steel bottom valve thrust deformation rupture testing arrangement for tank car |
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2020
- 2020-03-30 CN CN202010236556.6A patent/CN111272414A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112362494A (en) * | 2020-10-15 | 2021-02-12 | 中国特种设备检测研究院 | Hydraulic bulging test system |
| CN113027832A (en) * | 2021-03-05 | 2021-06-25 | 浙江省泵阀产品质量检验中心（永嘉县质量技术监督检测研究院） | Steel bottom valve thrust deformation rupture testing arrangement for tank car |
| CN112924167A (en) * | 2021-04-22 | 2021-06-08 | 青岛海洋工程水下设备检测有限公司 | System for testing internal pressure and external pressure of underwater hydraulic valve and experimental method |
| CN112924168A (en) * | 2021-04-22 | 2021-06-08 | 青岛海洋工程水下设备检测有限公司 | System for testing internal pressure and external pressure of underwater manual valve and experimental method |
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