1184results about "Machine valve testing" patented technology

An apparatus and method for testing the performance of a safety valve. The apparatus includes an accumulator including at least one electric heater for heating a predetermined amount of water in the accumulator, and storing steam produced by the electric heater, a test vessel storing the steam supplied from the accumulator, and providing steam at a test pressure to a safety valve, the steam being supplied after controlling flow rate and pressure, a condensing tank storing demineralized water to be supplied to the accumulator, and condensing and collecting the steam discharged from the safety valve, and a water-supply pump supplying the water stored in the condensing tank to the accumulator.

The invention relates to the technical field of hydraulic test equipment, in particular to a multifunctional hydraulic comprehensive test bench, comprising a platen. A groove is formed on the upper surface of the platen. A first bearing is though provided on the middle of each of the two sides of the inner wall of the groove. An adjusting rod is rotationally provided between the two first bearings. A pressure sensor is fixedly mounted at each of the four corners of the upper surface of the movable plate. A supporting plate is fixedly mounted on each of the two ends of one side of the upper surface of the platen. A top cover is fixedly mounted on the upper end of each of the supporting plates. A hydraulic push rod is fixedly mounted at the middle of the lower surface of the top cover. A pressing plate is fixedly mounted at the lower end of the hydraulic push rod. Four positioning mechanisms are fixedly mounted on one side of the upper surface of the platen. A placing plate is fixedly mounted among the four positioning mechanisms. A mounting groove is formed on the upper portion of one side of the fixed block. A second sliding groove is fixedly mounted on each of the two sides of theinner wall of the mounting groove. According to the multifunctional hydraulic comprehensive test bench, a test piece can be fixed and adjusted, the operation is simple, the use is convenient and thepracticability is high.

The invention relates to a high-pressure diaphragm pump check valve fault diagnosis method based on vibration signal analysis, and belongs to the field of mechanical fault diagnosis and signal processing. The high-pressure diaphragm pump check valve fault diagnosis method based on the vibration signal analysis comprises the following steps that firstly, VMD decomposition is carried out on a vibration signal of a check valve of a high-pressure diaphragm pump, and the number K of decomposition modes is determined through a center frequency to obtain K IMF components with physical significance; the MPE of the IMF components is then calculated to form a multi-scale complexity measure feature vector; and finally, a high-dimensional feature matrix is input into a classifier established by a support vector machine optimized based on a genetic algorithm to identify a working state of the check valve of the high-pressure diaphragm pump. According to the high-pressure diaphragm pump check valvefault diagnosis method based on the vibration signal analysis, the vibration signal of the check valve is denoised and decomposed into the IMF components without mode-mixing through a VMD algorithm, the multi-scale arrangement entropy of each IMF component is calculated to collect fault characteristic information distributed on multiple scales, the correct rate of fault identification of the checkvalve is improved, and higher practicability and engineering significance are achieved.

A processing apparatus includes a processing chamber configured to accommodate a target object to be processed, gas supply paths provided in a corresponding relationship with the kinds of process gases supplied into the processing chamber, and valves respectively arranged in the gas supply paths to open and close the gas supply paths. The processing apparatus further includes valve drive units configured to independently drive the valves, sensor units configured to independently monitor opening and closing operations of the valves, and a control unit configured to determine operation statuses of the valves based on valve opening and closing drive signals transmitted to the valve drive units and/or valve opening and closing detection signals transmitted from the sensor units.

A breather valve and a portable communication device including a breather valve are provided. The breather valve includes a housing having a bottom portion having an opening and side portions, a rigid substrate located within the housing and a breathable membrane mounted to the rigid substrate. The breather valve further includes a gasket having a top surface and a bottom surface, and a preloaded compression element across the gasket and the rigid substrate. The gasket has an upper energy director located at the top surface and a lower energy director located at the bottom surface. The preloaded compression element provides at least a first compressive position providing a contact between the lower energy director and the bottom portion of the housing and a second compressive position in which air passes around the lower energy director and the upper energy director.

The invention discloses a method for setting a valve flow characteristic curve of a steam turbine and belongs to the technical field of steam turbines. An overlap function is calculated by using datain single valve operation of a unit to obtain a new valve flow curve, and the reliability of a new characteristic curve is verified by using the data obtained in sequence valve operation of the unit.According to the method, valve flow characteristic parameters of the steam turbine can be completely and specifically set, so that switching between single valve and sequence valves is smooth, steam flow change is gentle during switching, load fluctuation is small, segment temperature and vibration do not greatly change and safe and stable operation of the unit is ensured; the response rate of AGCis optimized and the primary frequency modulation effect is improved; the overlap of regulating valves is reduced to improve the economy of the unit; and computation is simplified by using MATLAB programming.

The invention relates to an intelligent comprehensive test device for a breather valve for an oil tank truck. The intelligent comprehensive test device comprises a vacuum pump, an air compressor, a test container, a pressure stabilization tank, a human-computer interaction computer system and a high-accuracy gas flowmeter set; the pressure stabilization tank is connected with the test container; the pressure stabilization tank is also connected with the vacuum pump for vacuumizing the test container; the pressure stabilization tank is also connected with the air compressor for providing a positive pressure gas medium to the test container; the test container is provided with a leakage rate detection hole; the leakage rate detection hole is connected with the high-accuracy gas flowmeter set; and the human-computer interaction computer system for controlling the vacuum pump, the air compressor and the test container is connected with the vacuum pump, the air compressor and the test container. The intelligent comprehensive test device has the advantages of complete function, convenience and rapidness for mounting and low cost; and the designed test container can meet requirements of different specifications of internal and external breather valves for positive pressure and negative pressure opening tests, a valve seat sealing performance test and an overturn sealing performance test.

The invention relates to a reciprocating compressor air valve fault diagnosis method based on a time-varying singular spectrum, and the method specifically comprises the steps: collecting an air valvevibration acceleration signal and a pressure signal, carrying out the wavelet noise reduction and decomposition of an initial vibration acceleration signal, and removing a pseudo-component; selectinga proper time delay to construct a window function, and introducing time information into the multi-fractal analysis of the vibration signal, thereby obtaining a time-varying singular spectrum; and enabling the drawn time-varying singular spectrogram of each working process to describe the whole and detail information of the vibration signal more finely, so that parameters with large influence difference for a certain fault type are captured, fault feature vectors are convenient to construct, an SVM classifier is convenient to establish, parameters are optimized and set, and finally, the fault diagnosis of the air valve is successfully realized. The problem of fault diagnosis of the air valve of the reciprocating compressor is solved.

The invention discloses a comprehensive testing device for a rotary valve electric actuator. The comprehensive testing device comprises a base, a first cylinder, a second cylinder, an encoder, a movable friction disc, a fixed friction disc, a torque sensor and a coupler, wherein a mounting cavity is formed in the base, a mounting station for mounting an actuator is arranged at the top end of the base, a main shaft is arranged on the movable friction disc, the torque sensor and the main shaft are connected with an external actuator by means of the coupler, and the encoder is mounted on the movable friction disc, and the first air cylinder and the second air cylinder output alternately to generate variable pressure, so that the fixed friction disc generates variable friction forces on the movable friction disc, and the actuator is subjected to different torque. In the test process, the torque sensor tests the torque changes of the actuator, the encoder tests the rotation angle changes ofthe actuator, and the test values are compared with standards, so as to test whether the actuator is qualified or not. Through the arrangement, three key values of a valve can be tested at one time,the operation is convenient, and the efficiency is high.

The invention discloses a valve coupling vibration testing device and a testing method. The test device comprises a storage tank, power machinery, a buffer tank, a flow meter, an upstream control valve, an upstream pressure gauge, a valve to be tested, a downstream pressure gauge and a downstream control valve which are sequentially connected to a pressure withstanding flexible pipe through a metal pipeline to form a fluid flow loop. External excited vibration excitation is provided by a vibration bench. A vibration acceleration sensor and a strain gauge are arranged on the valve to be testedand are used for measuring vibration acceleration and dynamic strain respectively, and a center of gravity adjustment mechanism is installed to replace an execution mechanism. In the invention, external excited vibration of valves, flow-excited vibration and coupling vibration when the two work together of different working media, different structural forms and different working conditions can beinvestigated, and the vibration caused by collision of components is distinguished through testing the valves of different assembling forms.

A test method for steam internal leakage quantity of a low-pressure bypass valve of a thermal generator set comprises the following steps of (1) selecting a set load for performing internal leakage test on a bypass voltage of a low-pressure cylinder; (2) determining a boundary condition of experiment; (3) obtaining steam parameter change conditions of a low-pressure bypass system before and afterdesuperheating water flow change by changing bypass desuperheating water flow of the low-pressure cylinder; (4) recording an experiment parameter of each working condition point, and forming originalexperiment data; and obtaining internal leakage steam flow of the low-pressure bypass valve by calculation. An energy balance, mass balance and same boundary loss item offset method is employed, the internal leakage steam flow of the low-pressure bypass valve of the thermal generator set is obtained by accurate and quantitative calculation of experiment, quantitative analysis and calculation is performed for the low-pressure bypass valve of the thermal generator set when internal leakage occurs, and the most direct data support is provided for power plant running economy and maintenance operation of the low-pressure bypass valve of a power plant.

The invention relates to a safety valve inspection device. The safety valve inspection device comprises a test container and a liquid storage tank; the liquid storage tank communicates with the innercavity of the test container and can inject a low-temperature medium into the test container; the top of the test container is provided with a first control valve which communicates with the inner cavity of the test container and can be connected with a tested safety valve; a first booster is arranged in the inner cavity of the test container; the first booster comprises a first heat exchange tube; a second booster is arranged outside the test container; the second booster comprises a second heat exchange tube; the first heat exchange tube and the second heat exchange tube communicate with each other end to end, and a heat exchange circulation channel for circulating a heat exchange medium is formed; when the heat exchange medium flows through the interior of the first booster, the heat exchange medium exchanges heat with the low-temperature medium in the test container, so that the low-temperature medium absorbs the heat and expands, thus the pressure of the test container increases to verify the tested safety valve; and through the setting of the boosters, the self-evaporation capacity of the low-temperature medium is increased, the boosting rate of the test container is increased, the safety valve inspection time is shortened, the inspection efficiency is improved, and the labor cost is reduced.

The invention discloses a device and a method for measuring an unbalanced moment of the bottom surface of a round valve element. The device comprises a divergent type special-shaped pipe, a water tank, a transparent tube, a spring dynamometer, laser sources, the round valve element, a valve element bottom surface additional layer, a high-speed camera and a photographing support. Inner hook rings and the laser sources are uniformly distributed on the outer side of the circular valve element of the device; the spring dynamometer is connected with the inner hook rings and outer hook rings uniformly distributed on the inner wall of the transparent tube; and positioning scales are arranged on the outer wall of the transparent tube. According to the measuring method, the high-speed camera is erected on the photographing support to record an unbalanced state formed by the circular valve element under the impact of water flow in different directions; the scales, corresponding to the laser sources, on the outer wall and a pulling force of the spring dynamometer are read out; and a torque, corresponding to a certain specific symmetry axis, of the circular valve element is calculated. The device is simple in structure and easy to manufacture, and can be widely popularized and applied.

The invention provides a valve detection method and a valve detection system, and relates to the technical field of valve detecting. The valve detection method provided by the invention comprises the steps that the position of the valve element of a detected valve is detected, and the sectional area of the orifice of the detected valve is calculated; from the valve cavity size and the valve element position of the detected valve, the sectional area of the orifice between the valve element and the inner wall of the valve cavity is calculated; the inlet pressure and the outlet pressure of the detected valve are measured, and the pressure difference between the inlet pressure and the outlet pressure is calculated; and the flow coefficient of the detected valve is calculated. According to the invention, the valve detection method alleviates the technical problem of large error of valve detection in the prior art; the flow coefficient of the detected valve under different opening degrees can be calculated; and the detection accuracy of the flow coefficient is improved.

The invention discloses a valve detection device and a use method thereof. The valve detection device comprises a base platform, a detection table and a sealing cover, wherein an alarm indicator lampis arranged on the outer side wall of the base platform; a controller is arranged on one side of the alarm indicator lamp, and moving pulleys are arranged below the base platform; stabilizing bases are arranged on one sides of the moving pulleys; a size detection chamber is arranged at the bottom of the base platform, and a height adjustment hydraulic cylinder is arranged in the size detection chamber; a rotating motor is arranged above the height adjustment hydraulic cylinder, and a rotating disk is arranged above the rotating motor; a weight detector is arranged at the top of the rotating disk; and a fixing device is arranged above the weight detector. The valve detection device and the use method thereof have the beneficial effects that 1, the device has reasonable structural design, small occupied area, low installation difficulty and simple operation; 2, the device has diversified detection functions and high detection precision, thereby remarkably reducing the labor intensity ofworkers; and 3, the device has a long service life, low failure rate, high intelligence degree and high practicability.

The invention discloses an online performance and fault detection analysis system for a regulating valve. A displacement sensor is used for feeding back a displacement signal of the regulating valve;a membrane chamber pressure sensor is used for recording a pressure signal in a membrane chamber of an executive mechanism; an input signal collector is used for monitoring an input signal of a positioner; a time recorder is used for recording a time constant; a fault diagnosis device simply processes the input signal, membrane chamber pressure, displacement and time data, and compares the data with original data of the regulating valve to judge a running condition and a fault type of the regulating valve; and for the condition of exceeding a performance index original data limit value, the system transmits the operation data and the fault type to a detection data storage device, and sends the operation data and the fault type to a detection data receiving device in a manufactory control part through a detection data transmitter and a network cable. According to the system, online performance and fault detection analysis and diagnosis of the valve are realized.

The invention relates to a test method for obtaining flow characteristics of a high pressure regulating valve of a steam turbine. According to the method, a first-level steam extraction parameter of ahigh pressure cylinder is used as a calculation basis of main steam flow, and the flow characteristics of the high pressure regulating valve of the steam turbine are obtained by calculating the variable quantity of the main steam flow. Compared with the prior art, the test method provided by the invention has the advantages of better representative measuring points, installation at the outside the cylinder, convenient for inspection and processing, capability of ensuring the accuracy of the measuring points, and so on.

The invention discloses a steam turbine valve flow characteristic identification method and system based on a T-S fuzzy model and a medium. The steam turbine valve flow characteristic identification method based on the T-S fuzzy model comprises the steps: calculating and obtaining a regulating stage pressure estimation value corresponding to a steam turbine comprehensive valve position instructionwhen main steam pressure maintains a rated value; and inputting an input vector composed of the turbine comprehensive valve position instruction, the main steam pressure rated value and the regulating stage pressure estimated value into a preset T-S fuzzy model to obtain the actual steam inlet flow of the turbine, thereby obtaining the corresponding relation between the turbine comprehensive valve position instruction and the actual steam inlet flow under the working condition. According to the steam turbine valve flow characteristic identification method, the valve flow characteristics of the steam turbine are identified by adopting the T-S fuzzy model, and a steam turbine valve flow characteristic test is not needed, and manpower and material resources are saved, and the workload is greatly reduced, and adverse effects of a conventional test method on safe and stable operation of a unit are avoided.

The invention discloses an automobile brake system high-speed switch valve development test method. A test tool of a high-speed switch valve, an oil tank and a temperature sensor are fixedly installedin a high-low temperature environment box. The oil tank is connected with an inlet of the variable pump through the inlet filter; an outlet of the variable pump is connected with an inlet of the testtool through a throttle valve; an overflow valve and an energy accumulator are connected and installed on a pipeline between the throttle valve and the outlet of the variable pump, a pressure sensorand a flow sensor are connected and installed on a pipeline between inlets of the throttle valve testing tools, and an outlet of each testing tool is connected back to the oil tank after sequentiallypassing through a pneumatic ball valve and an outlet filter. The flexibility of development and test of the high-speed switch valve is improved, the test range is widened, and the test cost is reduced; the testing method is simple, feasible, small in debugging workload and high in testing efficiency, provides data reference for algorithm development of an electro-hydraulic control system, and hasimportant significance in improving pressure control precision and reducing product noise.