662results about "Machine valve testing" patented technology

The invention relates to the technical field of response time testing of electro-hydraulic proportional valves, and discloses a response time testing method and system of an electro-hydraulic proportional valve, and the method comprises the steps: collecting multi-point pressure, step response, pipeline length and medium parameters, and unifying the time reference to obtain an original pressure sequence; constructing an inverse filter spectrum to remove damping interference so as to recover a sharp peak value; lagging offset is calculated according to pipeline and medium parameters, time delay compensation is carried out, and an alignment sequence is obtained; intercepting a non-stationary segment to eliminate residual delay deviation; constructing a response dynamic data set, extracting harmonic frequency domain representation, and reconstructing a pressure sequence through inverse transformation and superposition of compensation factors; and calculating a deviation integral quantity, adjusting a dynamic compensation parameter, performing weighted correction, and outputting an optimized reconstruction response sequence. According to the method, accurate reconstruction of the real pressure response of the proportional valve can be realized, so that the accuracy and the reliability of response time testing are improved.

The invention provides an intelligent fault diagnosis method and system for electromagnetic valve test data and a computer program product, and relates to the technical field of electromagnetic valve fault diagnos.The intelligent fault diagnosis method comprises the steps that firstly, multi-dimensional test data of an electromagnetic valve under multiple working condition combinations are collected, and multiple types of data including action response and the like are contained; a data behavior collaboration model is constructed based on the behavior collaboration relation between the data, and laws such as synchronous response are embodied; an abnormal collaboration chain deviating from a normal collaboration mode is mined from the model, and abnormal performance of each link is determined; reversely deducing a fault core cause through the abnormal collaborative chain, and determining information such as cause types; and finally, generating an executable instruction sequence based on the fault core inducement and the abnormal collaborative chain conduction characteristic, and controlling the maintenance system to execute fault handling operation. Therefore, faults can be comprehensively and accurately diagnosed, and the operation reliability and the system stability of the electromagnetic valve are improved.

The invention relates to the technical field of mechanical equipment fault diagnosis, and discloses a fault diagnosis method and system for an automatic tensioning control valve of a scraper conveyor. The method comprises the following steps: acquiring pressure and flow data of a main flow channel and an auxiliary flow channel through a sensor array, and extracting frequency domain characteristics to obtain a standardized frequency spectrum; detecting parameter coupling abnormity based on the spectrum cross correlation coefficient and generating an abnormal index; environment interference and medium viscosity data are fused, and non-linear feature distribution and correction deviation representing the mechanical state are obtained through classification and filtering analysis; matching the correction deviation with a preset fault mode, determining a fault type, and generating a fault positioning coordinate in a three-dimensional space by using an optimization algorithm; and finally, performing fluid dynamic simulation through the high-fidelity virtual model to verify the coordinate stability, and outputting accurate early warning when conditions are met. Through cooperation of multi-source information fusion and an intelligent algorithm, the accuracy of early-stage internal fault diagnosis of the complex double-flow-channel valve is improved.

The invention discloses a detection and calibration device and method for clamping stagnation of an EGR (Exhaust Gas Recirculation) valve, and the method comprises the steps: firstly, dismounting the EGR valve of an engine, and dismounting the EGR valve into an actuator and a valve body; the first component is installed on the original installation face, in butt joint with the valve body, of the actuator, and the distance between the plane at one end of a push rod of the actuator and the installation plane of the actuator is adjusted and fixed to any numerical value; the second component is installed on the original installation face, where the actuator is installed, of the valve body, and the distance between the end face, connected with the bowl body, of the adjusting bolt unit and the installation face of the valve body is adjusted to be equal to the distance between the plane at one end of a push rod of the actuator and the installation plane of the actuator; and then detection is carried out according to an EGR valve clamping stagnation fault test method. According to the detection and calibration device and method for clamping stagnation of the EGR valve, the EGR valve cannot be damaged in the EGR valve detection process, and clamping stagnation faults can be set randomly in the stroke of the EGR valve.

The invention relates to a multi-mode quality inspection system based on industrial valve production, in particular to the field of industrial intelligent manufacturing, and can significantly improve the accuracy and reliability of industrial valve quality inspection by setting a space-time alignment module, a feature fusion module, a fusion strategy optimization module and a quality decision and model updating module. Various fine defects of the valve can be accurately identified through efficient fusion and intelligent analysis of multi-modal data; the self-adaptive optimization mechanism ensures the stable performance of the system under different production working conditions, effectively reduces the missed detection and misjudgment risks, guarantees the product quality, reduces the production waste and potential safety hazards, prolongs the effective service period of the system through continuous self-optimization, and achieves the efficient and high-quality closed-loop management in the intelligent manufacturing process.

The invention provides a hydraulic turbine set valve fault diagnosis method, system, equipment and product, and is applied to the field of hydroelectric equipment fault diagnosis. On one side of the edge end, an initial voiceprint signal, an initial vibration signal and temperature data of a hydraulic turbine set valve are collected; taking the initial voiceprint signal as a reference signal, and performing noise reduction processing on the initial vibration signal based on the time domain correlation between the fluid noise in the initial voiceprint signal and the first noise in the initial vibration signal; by taking the vibration noise reduction signal as a reference signal, performing noise reduction processing on the initial voiceprint signal based on the frequency domain correlation between the mechanical resonance noise in the vibration noise reduction signal and the second noise in the initial voiceprint signal; and based on the vibration noise reduction signal, the voiceprint noise reduction signal and the temperature data, performing fault diagnosis on the hydraulic turbine set valve to obtain a fault diagnosis result. Therefore, fault diagnosis is carried out through cooperative noise reduction of the voiceprint signal and the vibration signal in combination with multi-dimensional data, and the fault diagnosis accuracy of the hydraulic turbine set valve is improved.

The invention relates to the technical field of safety valve testing and monitoring, and particularly discloses an online verification and performance evaluation system for a safety valve. The system comprises a field data acquisition module, an edge calculation and feature extraction module, a cloud performance evaluation and decision module and a man-machine interaction module. Multi-dimensional features are extracted by synchronously collecting pressure, acoustic emission, vision and process data, and comprehensive evaluation and decision making are carried out based on a dynamic performance baseline, a multi-parameter fusion degradation model and system collaboration analysis. According to the invention, the spanning from single parameter verification to system-level performance prediction and evaluation is realized, and a solution is provided for predictive maintenance and full-life-cycle management of the safety valve.

The utility model relates to the technical field of valve performance test, and discloses a pneumatic valve flow test system, which comprises a multi-path gas source supply unit comprising a gas source supply assembly, a main pipeline and a shunting assembly which are sequentially connected in series, and the shunting assembly distributes gas of the main pipeline to at least two parallel test branches, each test branch is provided with an independent branch pressure reducing valve; the multi-range flow testing unit comprises gas mass flow meters which are respectively arranged on the testing branches, and the measuring ranges of the gas mass flow meters are different; the multi-size interface pipeline unit comprises quick connectors which are respectively arranged at the tail ends of the test branches and are used for being connected with a valve to be tested, and the sizes of the quick connectors are different; the actuator is connected with the to-be-tested valve and used for receiving the control signal and adjusting the opening degree of the valve; and the data acquisition and processing unit is electrically connected with the gas mass flow meter and the actuator. The pneumatic valve flow test system meets the rapid detection requirements of valves of different specifications.

The invention discloses a digital intelligent pressure testing device for a flat valve, relates to the technical field of petroleum drilling, and aims to solve the problem that a pressure testing device with high intelligent and automatic degree is needed at present. The digital intelligent pressure testing device for the flat valve comprises a pressure testing table, and a grabbing mechanism for grabbing the flat valve is arranged on the pressure testing table; a top cylinder used for blocking the flat valve is arranged on the pressure testing table, and a switch rotating disc corresponding to a hand wheel of the flat valve is further arranged on the pressure testing table and used for driving the hand wheel to rotate.

The invention discloses a building machine hydraulic system fault diagnosis method fusing pressure-displacement double parameters, and relates to the technical field of building machine hydraulic system fault diagnosis, and the method specifically comprises the steps: 1, determining the physical position and bearing function of a machine position, configuring an independent sensor group for each machine position, determining a collection period, and carrying out the fault diagnosis of the building machine hydraulic system; the method comprises the following steps: step 1, collecting and preprocessing multi-dimensional parameters in real time, step 2, constructing a noise level evaluation model, dynamically adjusting a filtering kernel function, extracting equipment-working condition coupling features and multi-camera cooperative features in real time, and constructing a dynamic coupling feature vector for each camera, and step 3, training an attention mechanism model based on historical fault data, calculating the similarity between the standardized core features and a fault template library, outputting the fault confidence, judging a fault mode in combination with a threshold value determined by an ROC curve, extracting a trend index by a sliding time window, matching a rule library based on a mechanism and historical data, generating an auxiliary diagnosis conclusion, and performing cross validation with a model result.

The invention relates to the technical field of intelligent monitoring of industrial valves, in particular to an intelligent monitoring and state evaluation system for sealing wear of a semi-ball valve, which comprises the following steps of: dividing action stages in the opening and closing process of the semi-ball valve, and organizing sealing monitoring in an operation stage of forming stable sealing contact between a valve core and a sealing surface; corresponding data acquisition modes are adopted according to different operation stages, and operation parameters directly related to the sealing contact behavior are obtained; staged processing is carried out on collected data, a sealing response characteristic section with clear physical significance is constructed, and a sealing contact dominant state and a change relation thereof are identified in multiple operation cycles; further comprehensively evaluating the sealing wear state of the semi-ball valve based on the persistence characteristic and the space migration condition of the dominant sealing response characteristic section in the continuous operation cycle; according to the invention, the operation evaluation and maintenance decision-making capability of the sealing state of the semi-ball valve is greatly improved.

The application relates to the technical field of sealing performance detection, and discloses a detection system and a detection method for detecting bidirectional leakage of a spherical sealing valve of an aircraft bleed air system; the system comprises an air inlet device, a sealing device and a detection device; the air inlet device provides pressure-controllable and clean test gas; the sealing device is used for fixing the spherical sealing valve and simulating two sealing states of the spherical sealing valve in a high-pressure stage regulator, thereby forming two independent test gas paths; the detection device is connected to the outlet of the sealing device and is used for quantitatively or qualitatively detecting leakage gas and comprises a flow monitoring unit and a differential pressure monitoring unit; the sealing device can test the sealing performance of a ceramic ball and a poppet valve seat and the sealing performance of the ceramic ball and a valve mounting seat by replacing or adjusting a limiting structure; the application realizes component-level bidirectional sealing performance detection, improves test precision and maintenance efficiency, can identify defects before assembly, and reduces the rework rate.

The invention relates to the technical field of temperature control valve testing, and discloses a temperature control valve cold and hot alternating testing device which comprises a cold and hot testing machine, a separation cover is fixed in the cold and hot testing machine, a net rack is fixed on the top surface of the separation cover, an air port is formed in the top surface of the separation cover, a fixing plate is fixed in the air port, and a temperature control valve is arranged in the fixing plate. A plurality of first air channels are formed in the fixed plate, two guide plates are fixed to the inner top face of the separation cover, each guide plate is obliquely arranged, a driving assembly is arranged in the separation cover, a flow guide assembly is arranged in the separation cover and used for guiding airflow, and a rotating assembly is arranged in the separation cover. According to the invention, recovery and secondary utilization of hot gas are realized, energy is saved, and the test cost is reduced.

The application discloses a kind of breathing valve online verification method, device and storage medium, and verification method includes: obtaining the first information of to-be-tested breathing valve, first information includes: ambient temperature, valve initial temperature, valve real-time temperature, target temperature, reference temperature, standard exhalation opening pressure and standard inhalation opening pressure;According to ambient temperature, valve initial temperature and target temperature, valve real-time temperature is adjusted to target temperature;Pressure verification test is carried out to to-be-tested breathing valve, and second information is obtained, second information includes measured exhalation opening pressure and measured inhalation opening pressure;According to first information and second information, qualified determination is carried out, and verification result is output.The application discloses breathing valve online verification method, device and storage medium, by obtaining valve temperature information, actively adjusting valve temperature to target temperature, executing pressure verification and carrying out qualified determination, fundamentally avoid the interference of ambient temperature to breathing valve, improve the accuracy and reliability of online inspection.

The invention provides an online detection device and method for an electromagnetic pilot valve. The online detection device for the electromagnetic pilot valve comprises a main conveying line, a plurality of conveying line branches working in parallel and detection subsystems corresponding to the conveying line branches. The main conveying line is used for linking a plurality of detection subsystems and butting a plurality of conveying line branches working in parallel; the plurality of conveying line branches working in parallel are used for simultaneously conveying to-be-detected electromagnetic pilot valves to each detection subsystem station; the detection subsystem comprises a feeding and discharging robot and a detection assembly, and the feeding and discharging robot is used for transferring the to-be-detected electromagnetic pilot valve from the main conveying line to each conveying line branch and grabbing the to-be-detected electromagnetic pilot valve to move among different detection stations; the detection assembly is used for executing various types of tests on the to-be-detected electromagnetic pilot valve, the problem that the detection rhythm and efficiency cannot be matched with an automatic assembly line can be solved, seamless butt joint with the automatic assembly line is achieved, and the production efficiency is improved.

The application provides a dynamic simulation test method and system for the cycle life of a pressure reducing valve, and relates to the technical field of valve performance testing. The method comprises the following steps: installing the measured pressure reducing valve in a test pipeline, opening the inlet side valve and the outlet side pressure relief valve, manually adjusting the inlet pressure regulator to make the inlet pressure of the measured pressure reducing valve reach the maximum rated inlet air pressure, obtaining the measured pressure reducing valve with the set inlet pressure; on the basis of the measured pressure reducing valve with the set inlet pressure, adjusting the measured pressure reducing valve itself to make the outlet pressure reach the maximum rated outlet air pressure, obtaining the measured pressure reducing valve with the rated values of the inlet pressure and the outlet pressure; extracting the fluid-structure coupling geometric topology features and the real-time pressure gradient field of the measured pressure reducing valve with the rated values of the inlet pressure and the outlet pressure, and constructing a three-dimensional space discretization grid model. The application improves the test efficiency and reduces the test equipment investment of enterprises.

The utility model belongs to diaphragm detection technical field discloses a kind of pressure regulating valve diaphragm detection devices, for detecting the soundness of the diaphragm of pressure regulating valve, cavity is equipped in pressure regulating valve, diaphragm is located in cavity, this pressure regulating valve diaphragm detection device includes gas pressurization structure, gas transmission structure and pressure detection structure, gas pressurization structure is used to provide gas in cavity, pressure detection structure is used to detect and display the air pressure in pressure guide pipe. By gas pressurization structure, gas is pressed into the cavity of pressure regulating valve, gas flows into cavity through pressure guide pipe, when the value shown by pressure detection structure rises to certain value, stop pressing gas, observe the indication change condition of pressure detection structure, if the indication of pressure detection structure is stable, it is determined that diaphragm is sound, if the indication of pressure detection structure reduces, it is determined that diaphragm is damaged. Not only can the soundness of diaphragm be judged quickly and accurately, but also work efficiency can be improved significantly, and artificial cost and operation risk are reduced.

The utility model discloses a pressure relief valve calibrator for a transformer, and relates to the technical field of transformers, in particular to the pressure relief valve calibrator for the transformer, which comprises a base cylinder, a butt joint cylinder and a U-shaped limiting plate, a gear concentric with the output end of the servo motor is installed at the output end of the servo motor and meshed with a rack rod through teeth, a guide ring is installed on the side face, away from the teeth, of the rack rod, a guide rod is installed on the inner wall of the base cylinder, and a supporting rod is installed at the top of the rack rod. The pressure relief valve calibrator for the transformer has the effects of conveniently limiting the position of the pressure relief valve and preventing the position of the pressure relief valve from deviating during calibration, through cooperation of a gear and a rack rod, a plurality of arc-shaped limiting blocks can conveniently and synchronously move to limit the position of the pressure relief valve, the stability of limiting the position of the pressure relief valve is improved, and the calibration accuracy of the pressure relief valve is improved. And the purpose of improving the practicability is achieved.

The invention discloses a high-temperature friction testing device for a hydraulic slide valve. The device is composed of a valve element clamping module, a valve body mounting module, a vertical force applying module, a high-temperature heating module and a friction force applying module. The valve element clamping module is composed of a valve element, a valve element centering fixing column, a valve element fixing clamp, a valve element mounting rod and a mounting rod fixing shell. The valve body mounting module consists of an oil storage tank, an oil storage tank fixing plate and a valve body; the vertical force applying module comprises X, Y and Z three-axis guide rails driven by a motor, and pressure and friction force sensors; the high-temperature heating module surrounds the whole valve body and the valve core mounting part; the friction force applying module is driven by a motor to drive the oil storage tank to achieve axial movement of the valve body, and relative friction between the valve element and the valve body is achieved. The device can carry out friction tests of the hydraulic slide valve at different temperatures, realizes friction wear simulation of the hydraulic slide valve under multiple working conditions of oil environment, high temperature, pollution and the like, and provides data support for wear and degradation tests of the hydraulic slide valve.

The embodiment of the application provides a ballast valve performance testing device and system to improve the accuracy of ballast valve performance testing, and relates to the technical field of aerostat. The ballast valve performance testing device provided by the embodiment of the application comprises a storage box, a receiving box and a driving assembly. The storage box forms a first accommodating cavity, the first accommodating cavity is used for accommodating materials, the first accommodating cavity has a feeding port and a discharging port, the discharging port is located below the feeding port, and the discharging port is used for arranging the ballast valve. The receiving box forms a second accommodating cavity, the second accommodating cavity has an opening, the opening is located on the lower side of the discharging port, so that the materials can enter the second accommodating cavity through the discharging port and the opening. The driving assembly is used for driving the receiving box to move, so that the opening can move to the upper side of the feeding port, and then the materials in the second accommodating cavity can enter the first accommodating cavity through the feeding port and the opening. The ballast valve performance testing device provided by the embodiment of the application is used for testing the performance of the ballast valve.

The utility model discloses a pressure adjusting device of a portable self-connection filtering pressure reducing valve. The pressure adjusting device comprises a base, a left air cylinder, a right air cylinder, an interface assembly, a plugging part, an air cylinder control switch, a test control switch and a pressure detection device, the left air cylinder and the right air cylinder are respectively arranged on two different sides of the base; the air source is connected with the left air cylinder and the right air cylinder through the air cylinder control switch; the air source is connected with the left air cylinder through the test control switch; the left air cylinder is connected with the plugging part through the connector assembly, and the right air cylinder is connected with the plugging part through the connector assembly. And the right air cylinder is connected with the pressure detection device. According to the working principle of the filter pressure-reducing valve, the hose, the base left air cylinder, the base right air cylinder, the interface assembly, the plugging part, the air cylinder control switch, the test control switch and the pressure detection device are designed, so that the pressure adjustment and inspection of the filter pressure-reducing valve do not need to be carried out on a specified comprehensive test bed test, the pressure adjustment is more convenient, and the test efficiency is improved. And the inspection time can be reduced.

The utility model discloses pressure test detection equipment for valve production and processing, which comprises a support frame, a clamping assembly is arranged on the support frame, the clamping assembly comprises an air cylinder and a moving plate, the air cylinder is arranged on the support frame, the moving plate is connected to the output end of the air cylinder, a fixed plate is arranged on the support frame, and the fixed plate is connected to the output end of the air cylinder. The fixed plate and the movable plate are each provided with a connecting pipe, the number of the connecting pipes is two, one connecting pipe is connected with a water inlet hose, the water inlet hose is provided with a removing assembly, the removing assembly comprises a fixed sleeve and a movable ring, the fixed sleeve is installed on the water inlet hose, and the movable ring is installed on the fixed sleeve. And the movable ring is slidably connected to the fixed sleeve, so that the technical problem that in the prior art, when existing pressure test detection equipment is used for valve detection, once a valve needs to be replaced in the detection process, a rapid clamping and releasing mechanism is lacked, and the continuous operation capacity and procedure connection are seriously affected is solved.

The utility model discloses an automatic T-shaped product anti-reflux valve performance test frame, which comprises a test frame, a cylinder frame is fixedly arranged at the center position of the top of the test frame, a pressing cylinder is fixedly arranged on one side of the cylinder frame, a rear cylinder fixedly arranged at the top of the test frame is arranged on the rear side of the cylinder frame, and a pressing cylinder is fixedly arranged on the other side of the cylinder frame. Side cylinders fixedly mounted at the top of the test frame are arranged on two sides of the cylinder frame; a lower pressing plate is fixedly installed at the output end of the lower pressing air cylinder, a rear baffle is fixedly installed at the output end of the rear air cylinder, side baffles are fixedly installed at the output ends of the side air cylinders, and products to be tested are arranged among the lower pressing plate, the rear baffle and the two side baffles. According to the utility model, the product to be tested can be conveniently limited and fixed, the channel of the T-shaped product to be tested can be conveniently positioned and sealed, the test accuracy is improved, the automation degree is high, the operation is simple, the situation that the performance of the damaged anti-reflux valve cannot be found in manual assembly is avoided, and the unqualified product is prevented from reaching the hand of a terminal user.

The embodiment of the application provides a sealing detection tool convenient for ball valve positioning, and relates to the technical field of ball valves. The sealing detection tool convenient for ball valve positioning comprises a base, a clamping assembly and a positioning base. The base is internally provided with a booster pump. The movable end of an electric push rod drives the first clamping jaw to slide. The first detection interface is in communication with the output end of the booster pump. The upper surface of the positioning base is provided with a V-shaped positioning groove for positioning the ball valve. The positioning base is rotatably provided with a sleeve. The bottom of the positioning base is provided with a rotating mechanism for driving the sleeve to rotate. According to the diameter of the ball valve stem, the sleeve with a corresponding inner diameter is replaced, so that the stem can be freely rotated and adjusted after being inserted, and the radial deviation can be limited. The same tool can complete the sealing and flow detection at different openings, and the ball valve does not need to be transferred to other equipment. The single ball detection time is greatly shortened, and the efficiency is greatly improved.

The utility model discloses a pipeline valve flow coefficient test system, which is applied to a gas pipeline and comprises a test pressure reducing valve, a tested valve, a flow meter, an electric valve and a controller. Wherein the test pressure reducing valve is arranged on the gas pipeline and is used for adjusting the gas pressure in the gas pipeline; the tested valve is arranged on the gas pipeline and is positioned at the downstream of the tested valve; the flow meter is arranged on the gas pipeline, is positioned at the downstream of the detected valve and is used for detecting the flow in the gas pipeline; the electric valve is arranged on the gas pipeline and is positioned at the downstream of the flowmeter; the controller is electrically connected with the flow meter and the electric valve and used for obtaining the flow of the flow meter and controlling the opening degree of the electric valve. According to the utility model, accurate control of the flow in the gas pipeline is realized, and the problems that the flow in the gas pipeline cannot be stabilized at a target value and the flow coefficient of the tested valve cannot be accurately tested due to manual adjustment of the valve in the prior art are solved.

The utility model discloses a testing device for testing the flow coefficient of a flow regulating valve. The testing device comprises a water tank; the flow regulating valve is arranged on the main pipeline; the differential pressure sensor is connected to the main pipeline on the two sides of the flow regulating valve; the pressure difference regulating valve is arranged on the main pipeline; the pneumatic three-way valve is arranged on the main pipeline, an inlet of the pneumatic three-way valve is connected to an outlet of the differential pressure regulating valve, and a first outlet of the pneumatic three-way valve is connected to an inlet of the water tank; the container is connected with a second outlet of the pneumatic three-way valve; and the mass meter is used for measuring the mass of the container. According to the device, a weighing method is adopted for flow measurement, a PLC system is combined for control and data collection, operation of a three-way valve and an auxiliary pump and the rotating speed of the pump are controlled, and signals of a high-precision electronic balance and differential pressure signals of a differential pressure transmitter are collected, so that accurate evaluation of the micro flow regulating valve is achieved.

The invention is suitable for the technical field of fluid mechanics experiments, and provides a Tesla valve visualization experiment device and method based on semiconductor heating and cooling, and the device comprises a Tesla valve heat dissipation plate, a fluid supply and vacuum system, a heating, cooling and temperature control module, a data acquisition and visualization module, a supporting and fixing module and a power supply module. A valve body structure formed by combining an acrylic plate and a copper plate engraved with a Tesla valve runner is matched with a high-precision high-speed camera, so that the real-time visual observation of the flowing state of fluid in the Tesla valve is realized. According to the invention, visualization of the Tesla valve flow channel experiment is realized, the flowing form of fluid in the Tesla valve flow channel can be clearly presented, the Tesla valve performance verification method is suitable for Tesla valve performance verification under different structure parameters, different fluid media and temperature conditions, and reliable experiment support is provided for structure optimization and application expansion of the Tesla valve.

The utility model relates to the technical field of superconducting magnets, in particular to an automatic safety valve detection device for magnetic resonance equipment, which comprises a pressure providing unit, and a gas outlet at the upper end of the pressure providing unit is sequentially communicated with a pressure reducing valve and a breather pipe; an electromagnetic valve, a safety valve and a counting sensor are sequentially arranged on the breather pipe, and the counting sensor is electrically connected with the counter. And a pressure gauge is communicated between the pressure reducing valve and the breather pipe. According to the automatic detection device for the effectiveness of the safety valve for the magnetic resonance equipment, automatic testing of the tested safety valve can be achieved, manual intervention of operators is not needed in the testing process, and the testing efficiency of the safety valve is improved while the personnel cost is reduced; in the testing process, the pressure reducing valve does not need to be frequently opened and closed, and the service life is prolonged; the device has the advantages of simple structure, high test efficiency, time saving, labor saving and the like.

The invention discloses a system and method for detecting the performance of a ventilation accessory of a storage tank, and the system is connected with the ventilation accessory to be detected, and comprises a gas supply module which is used for providing a required gas source and power for testing; the detection module is constructed into a detection loop of an integrated structure, is connected with the gas supply module, and is provided with a first passage for testing the opening pressure and the leakage rate of the first type of ventilation accessories and a second passage for testing the opening pressure and the leakage rate of the second type of ventilation accessories; the data measurement module is arranged between the inlet ends and the outlet ends of the first channel and the second channel and is used for recording the dynamic flow and the dynamic pressure of the gas in each test process; and the data processing module is used for calculating the accessory performance in the corresponding test scene by detecting a pressure sudden change phenomenon according to the dynamic flow and the dynamic pressure. The detection system is safe and reliable, the ventilation accessory does not need to be disassembled, and safe and accurate detection of the performance of the ventilation accessory is achieved.

This invention proposes a diagnostic method for hydrogen exhaust valves used in fuel cells, specifically for diagnosing faults in the fuel cell power system's power generation process where the hydrogen exhaust valve cannot be opened. During power generation, it was observed that when the hydrogen exhaust valve fails to open, the pressure at the fuel cell hydrogen inlet deviates very little from the actual set pressure, remaining essentially consistent with the set pressure. It was also found that after the hydrogen exhaust valve fails to open, and the fuel cell power generation system continues to operate, impurities such as water and nitrogen accumulate at the anode, leading to performance degradation. Based on this phenomenon, this invention uses a comprehensive diagnostic approach, considering the deviation between the set hydrogen pressure and the target pressure, as well as whether the fuel cell power system experiences a voltage undervoltage fault, to comprehensively diagnose the hydrogen exhaust valve's inability to open. This method is independent of changes in fuel cell performance, is simple, convenient, and provides a more accurate diagnosis of whether the hydrogen exhaust valve is unable to open.