3150 results about "Safety valve" patented technology

The invention discloses a quality detection method for a safety valve spring, and relates to the technical field of spring quality detection, and the method comprises the steps: constructing an appearance detection module, and carrying out the surface defect detection and size verification of a target safety valve spring; performing performance test and performance grade evaluation on the target safety valve spring through a performance detection module; and combining a surface defect detection result, a size verification result and a performance evaluation result to carry out spring quality comprehensive evaluation, and extracting a defective finished product production number according to a quality judgment result to carry out correlation analysis and defective product traceability. The technical problem that an existing safety valve spring quality detection method is low in accuracy and reliability due to the complexity of an application environment and the diversity of performance requirements in the prior art is solved, and the purpose of detecting the quality of the safety valve spring through all-dimensional and multi-angle appearance quality detection and performance attribute detection is achieved. And the accuracy and reliability of quality detection of the safety valve spring are improved.

The invention relates to the technical field of fuel gas safety, and discloses an intelligent fuel gas safety valve and a method for intelligently opening and closing the safety valve, and the intelligent fuel gas safety valve comprises a sensor unit which is configured to be installed near a fuel gas pipeline or fuel gas equipment; the control unit is in communication connection with the sensor unit; the execution unit is in communication connection with the control unit; the communication unit is in communication connection with the control unit; and the standby power supply is used for providing emergency power for the intelligent gas safety valve when the main power supply fails or is powered off. The concentration, the pressure, the temperature and the flow of the fuel gas are monitored in real time through the sensor unit, the system can quickly send out an instruction for closing the valve when detecting abnormal conditions (such as gas leakage and too high or too low pressure), and accidents such as fire disasters or explosions caused by fuel gas leakage are effectively prevented. The system monitors a plurality of key parameters of the gas system through a plurality of sensors in a combined mode, and a multi-level safety guarantee mechanism is formed.

A fluid exchanger may exchange a fluid (e.g., coolant) in a reservoir (e.g., vehicle radiator) by removing or withdrawing a first fluid (e.g., old, spent, used, etc.) and by introducing a second fluid (e.g., new, clean, etc.). In some examples, the exchanger includes a valve construction that permits easy and safe transitioning from a first mode in which the fluid in the vehicle is run in a loop (e.g., after a cleaner is introduced) to a second mode in which the fluid is exchanged. In some examples, the exchanger includes a restrictor that stops fluid from flowing when the pressure fails to satisfy a threshold (e.g., where the pressure is below a threshold). In some examples, the exchanger includes a safety valve (e.g., ball valve) in the bottom of the new fluid tank, such that when the tank is empty, the valve will close and reduce the likelihood of unintentionally pushing air into the system (e.g., emptying the reservoir).

The utility model relates to an anti-backpressure high-precision spring safety valve which comprises a valve body, a valve seat, a valve clack, a valve rod, a guide sleeve and a spring pressure setting device, the lower end of the guide sleeve is pressed at an inlet of the valve body through a radial outer step of the valve seat, and a protruding cylinder arranged on the upper portion of the valve seat is concentrically sleeved in a guide cavity of the guide sleeve. The valve clack is sleeved in the guide cavity of the guide sleeve to form a piston type dynamic sealing structure, so that the concentricity of the valve clack and the sealing surface of the valve seat can be kept, and the sealing matching performance of a sealing pair is improved; the upper end of the guide sleeve is in sealing connection with the inner wall of the spring cavity on the upper portion of the valve body, the valve clack and the spring cavity are sealed and isolated from an outlet cavity of the valve body, back pressure of outlet cavity medium pressure on the valve clack is eliminated, and influence of corrosion of media on the spring on setting pressure is avoided. The device has the advantages of high pressure setting precision, reliable sealing performance of a sealing pair and the like.

The invention provides a nuclear power safety valve remote monitoring and fault diagnosis method and system, and the method comprises the steps: obtaining multi-modal data collected through a sensor array; performing preprocessing and feature extraction on the multi-modal data to obtain various features of the multi-modal data; the fault type of the nuclear power safety valve is predicted based on the multiple features in combination with a CNN-LSTM hybrid model, and a preliminary fault type prediction result is obtained; and performing fuzzy logic optimization on the preliminary fault type prediction result to obtain a final fault type prediction result, and performing real-time alarm according to the final fault type prediction result. Relevant parameters of the parameterized three-dimensional digital twinborn model of the nuclear power safety valve are obtained in real time, and data of the parameterized three-dimensional digital twinborn model of the nuclear power safety valve are updated through the relevant parameters; through the parameterized three-dimensional digital twinborn model of the nuclear power safety valve, the operation and maintenance information of the fault part corresponding to the final fault type prediction result is visualized, and the accuracy, comprehensiveness and operation and maintenance assistance of fault prediction are improved.

The low-temperature safety valve comprises a valve body shell composed of an installation section, a pressure relief section and a reset section, a pressure relief pipe is fixedly installed on the side face of the pressure relief section, a transversely-arranged partition plate is fixedly installed in the pressure relief section, a heat preservation material is arranged in the pressure relief section, and a communicating hole is formed in the middle of the partition plate; a sealing block matched with the communicating hole is arranged in the pressure relief section, a connecting valve rod is fixedly installed on the upper surface of the sealing block, and a reset spring located on the inner side of the reset section is fixedly installed at the upper end of the connecting valve rod. According to the low-temperature safety valve with the leakage alarm function, the device is integrally installed in a pipeline system through a flange structure of the installation section, when the pressure reaches a set value, the sealing block is jacked up, the purpose of automatic pressure relief is achieved, and in the process, a gas sensor outside the pressure relief section is used for detecting surrounding gas, so that whether gas leakage exists at the joint or not is judged; and a wireless signal is transmitted to a computer so as to achieve the purpose of automatic alarm.

The invention discloses a safety valve airtightness detection device, and relates to the technical field of safety valve airtightness detection. Comprising a workbench, a driving box and two limiting bases, a detection device is fixedly arranged on the outer wall of the top of the workbench, and the detection device comprises a bottom plate and a mounting base. A first control block is rotated to drive an adjusting screw rod to rotate in a limiting hole, so that a clamping block slides in a sliding groove, a safety valve is clamped, an inflator arranged on the outer wall of a limiting base is started to inflate the interior of an air bag, the inflator starts to work, external air is inflated into the air bag through an inflation pipe and an inflation connector, and the air continuously enters the air bag, so that the safety valve is closed. The air bag expands gradually and is tightly attached to the periphery of the part, needing to be detected, of the safety valve in the expansion process, the detection area of the safety valve can be effectively sealed, good conditions are created for follow-up precise air tightness detection, detection gas leakage is prevented, and the accuracy of a detection result is ensured.

The utility model provides a hydraulic safety valve, which relates to the technical field of hydraulic safety valves and comprises a hydraulic safety valve body, an oil storage chamber is arranged at the top of the hydraulic safety valve body, and a heating structure is fixedly connected to the outer side of the oil storage chamber and can heat hydraulic oil in the oil storage chamber. Through the design of the heating structure and the heat dissipation structure, the temperature sensor can detect the temperature of hydraulic oil in real time, when the temperature of the hydraulic oil in the oil storage chamber is too low, the heating structure can be started and heat the hydraulic oil, so that the hydraulic oil can be located at the optimal working temperature, and when the temperature of the hydraulic oil is too high, the heat dissipation mechanism can be started; and a heating medium and hydraulic oil in the heating structure are subjected to synchronous heat dissipation, so that the heating structure can recover to the optimal working temperature.

Provided is a safety valve, a well system, and a method. The safety valve, in one aspect, includes a first portion, the first portion including a safety valve sub having a sliding sleeve, the first portion configured to be run-in-hole as part of wellbore tubing. The safety valve, in accordance with this aspect, further includes a second portion, the second portion configured to be run-in-hole after the first portion. The safety valve, in accordance with this aspect, further includes a third portion, the third portion including a mechanical connecting apparatus, the third portion configured to be run-in-hole after the second portion, the mechanical connecting apparatus configured to couple with the sliding sleeve of the first portion and the bore flow management actuator of the second portion to axially fix together the sliding sleeve and at least a portion of the bore flow management actuator.

The invention relates to the technical field of safety valve fault monitoring, in particular to a safety valve full-life-cycle fault detection method and system, and aims to solve the problems that sudden safety accidents occur frequently due to the fact that a traditional method depends on leakage flow monitoring and cannot capture hidden faults such as valve element jamming and spring fatigue, a power supply system mostly adopts a single power generation mode, and the power consumption is low. In a low discharge scene, the electric quantity of the energy storage module is used up, and monitoring interruption is caused. According to the invention, the problems of safety valve hidden fault monitoring deficiency and unstable power supply are effectively solved. By means of multi-dimensional data collection, spring elasticity attenuation and valve element movement abnormity can be found in advance, and faults are prevented from being evolved into serious leakage. The composite power supply system maintains basic monitoring in the non-discharge stage, energy is quickly supplemented in the discharge stage, and continuous operation of the whole life cycle is guaranteed. A model analysis result can guide maintenance personnel to accurately position a fault part, and unnecessary shutdown maintenance is reduced.

A subsurface safety valve for a wellbore for production of fluids from a subsurface formation comprises a drive portion and an actuator portion. The drive portion comprises a first magnet assembly and the actuator portion comprises a second magnet assembly that is magnetically coupled to the first magnet assembly. At least one of the first magnet assembly or the second magnet assembly comprises a spatially rotated array of magnets arranged such that a magnetic field emitted from an operative side of the spatially rotated array of magnets facing a magnetic coupling is non-zero and such that the magnetic field emitted from a non-operative side of the spatially rotated array of magnets that is opposite the operative side is about zero.

The invention provides a double-row low-temperature safety valve and relates to the technical field of safety valves, the double-row low-temperature safety valve comprises a main valve body, a valve cover and a pilot valve assembly, an inlet runner and an outlet runner are arranged in the main valve body, a guide sleeve is arranged in the main valve body, a first valve element is arranged in the guide sleeve in a sliding mode, and a valve seat is arranged in the main valve body; a first sealing piece is arranged at the lower end of the first valve element, a medium containing cavity is formed between the first valve element and the valve deck and located in the guide sleeve, the pilot valve assembly is communicated with the medium containing cavity and the inlet flow channel, and the first sealing piece and the valve seat can elastically deform. The medium containing cavity is filled with media to form pressure towards the valve seat on the first valve element, so that the first sealing piece extrudes the valve seat. According to the safety valve, the first valve element and the valve seat can both deform, the sealing performance of the valve seat and the first valve element under the low-temperature working condition is guaranteed, and the sealing performance between the first valve element and the guide sleeve is remarkably improved.

The invention provides a pilot operated safety valve with filtering and field testing functions, which relates to the technical field of pressure relief valves, comprises a pilot operated valve body, a main valve and a valve core, and is provided with a filtering mechanism and a flow testing mechanism. The filtering mechanism comprises a filter screen assembly and a sealing assembly movably installed in the filter screen assembly, an insertion hole communicated with the interior is formed in the side wall of the main valve and used for embedding the filter screen assembly, and the sealing assembly is automatically switched to a first state when liquid flows, blocks a gap between the filter screen assembly and the insertion hole and starts the flow testing mechanism; when the liquid stops flowing, the second state is switched, and blockage is relieved so that the filter screen assembly can be taken out and the flow testing mechanism can be closed. The flow testing mechanism is located downstream of the filter screen assembly and used for detecting the liquid flow. According to the design, integration of the filtering function and the flow testing function is achieved, operation, maintenance and testing are convenient, the sealing performance and the operation efficiency of the system are improved, and the system is suitable for fluid control and monitoring under complex working conditions.

The invention belongs to the technical field of electromagnetic valve shock absorbers, and discloses a novel damping-force-controllable double-electromagnetic-valve shock absorber which comprises a sealing opening and an electromagnetic valve-restoring assembly, the sealing opening is connected to the inner surface of the left end of an oil storage cylinder assembly in a sealed mode, an oil seal is attached to the right end face of the sealing opening, and a guide seat is attached to the right side surface of the oil seal; when current is low, the end cap is located in the middle, the closure area is large, the safety valve is in an open state, the closure area is increased, the pressure difference between the oil cavity P and the oil cavity P generates low-speed damping force, the pressure difference between the oil cavity P and the oil cavity P is increased, the sealing valve plate is easy to open, and the oil cavity P and the backflow valve seat generate high-speed damping force; when current is increased, the end cap is located at the lowermost end and makes contact with the upper end of the backflow valve seat, the closure area is minimum, the pressure difference between the oil cavity P and the oil cavity P generates low-speed damping force, the pressure difference between the oil cavity P and the oil cavity P becomes small, the sealing valve plate is difficult to open, and therefore the oil cavity P and the oil cavity P generate high-speed damping force.

The utility model discloses a straight flow type safety valve which comprises a safety valve body, the upper surface of the safety valve body is fixedly connected with an installation cover body through a flange, the upper surface of the installation cover body is provided with an annular sliding groove, and the inner wall of the annular sliding groove is slidably connected with arc-shaped sliding blocks distributed in an annular array in a sleeved mode. The upper surfaces of the multiple arc-shaped sliding blocks are fixedly connected with threaded rings, the lower surfaces of the threaded rings make contact with the upper surface of the mounting cover body, the upper surfaces of the threaded rings are fixedly connected with connecting rods distributed in an annular array, and one ends of the multiple connecting rods are fixedly connected with adjusting rotary discs. The effects that the limit value of the medium is accurately adjusted by the safety valve body, the stability of the safety valve body in use is improved, and the use safety of the safety valve body is improved by stably adjusting the pressure of the supporting spring are achieved.

The utility model relates to a safety valve. A safety valve comprises a valve body, a water inlet is formed in the lower end of the valve body, and a pressure relief opening is formed in the right end of the valve body. A hollow diaphragm is arranged in the valve body, a piston is arranged in the diaphragm, a spring is arranged in the piston, a spring support is arranged in the spring, and a valve bonnet is arranged at the upper end of the spring support. Under the action of the spring, the diaphragm can move up and down, so that the water inlet is closed and opened. An annular boss is arranged at the bottom in the valve body, and the outer wall of the upper end of the annular boss is designed to be an annular conical face with the small upper portion and the large lower portion. According to the structure, when the safety valve is opened, the gap between the annular boss and the diaphragm can be increased, and the flow of water flowing through is remarkably increased, so that the pressure relief capacity of the safety valve is improved, and the safety of a pipeline is guaranteed. The safety valve is optimized in structure and reliable in performance, and solves the problems that in the prior art, pressure relief performance is insufficient, installation and adjustment are inconvenient, and sealing performance is poor.

The invention discloses an intelligent sealing performance detection device for safety valve production, and relates to the technical field of safety valve detection, the intelligent sealing performance detection device comprises a mounting base, a clamping device, a pressing device, a detection device and a cleaning device, the mounting base is connected with the clamping device, the mounting base is connected with the pressing device, and the pressing device is fixedly connected with the detection device. The mounting base is connected with the cleaning device, the mounting base is used for providing mounting positions and supports for other devices, the safety valve is clamped and fixed through the clamping device, then scrap iron in the safety valve is cleaned through the cleaning device, the safety valve is connected through the pressing device, and air leakage at the joint of the safety valve and the pressing device is prevented. When detection is started, whether the air pressure in the safety valve reaches the standard or not is detected through the detection device, if the air pressure in the safety valve does not reach the standard, the detection device starts to detect the interior of the safety valve until the position of an air leakage point is detected, and then the air leakage point is marked.

The invention discloses a power plant water vapor centralized sampling device and method. The power plant water vapor centralized sampling device comprises a high-temperature and high-pressure sampling valve, a filter, a cooler, a cooler water inlet regulating valve, a cooler water return valve, a pressure reducing valve, a safety valve, an electromagnetic valve and a temperature controller. By means of the arrangement, in actual operation, the problems that a filter of a water vapor centralized sampling device is frequently blocked and cannot be thoroughly washed, and steam is easily discharged during sampling pollution discharge can be solved through the water vapor centralized sampling device. The opening degree of the cooling water inlet regulating valve of the cooler can be automatically regulated according to the temperature of the cooled sample water, so that the flow of the cooling water is reduced, the cooling water is saved, and the water vapor centralized sampling device is more economical and safer to use. Not only is the workload of workers reduced, but also the workers do not need to worry about steam discharge and scald accidents during pollution discharge. Compared with a traditional steam-water centralized sampling system, the safety and the convenience are greatly improved.

The invention discloses an integrated electro-hydraulic driving unit of a marine anchor and mooring machine. The integrated electro-hydraulic driving unit comprises an oil supplementing system, a main driving system, a control system, a safety system and a hydraulic motor, an oil supplementing pump in the oil supplementing system is connected with an oil drainage tank and communicated with a pressure oil tank in the main driving system, the pressure oil tank is communicated with a main pump in the main driving system through two third one-way valves, a port A and a port B of the main pump are communicated with a port A and a port B of a hydraulic motor respectively, and one ends of two safety valves in the safety system are connected with the port A and the port B of the main pump respectively. The other ends of the two safety valves are connected in parallel to a pipeline between the oil outlet of the pressure oil tank and the inlets of the two third one-way valves; a controller of the control system is in electric signal connection with the main motor; and an output shaft of the hydraulic motor is connected with an input shaft of the anchor windlass. Therefore, according to the design, the hydraulic pump station, the control valve and the hydraulic motor can be integrated, and the integration degree is high.

Provided is a smart gas Internet of Things (IoT) system for gas safety management. The system includes a smart gas user platform, a smart gas service platform, a smart gas safety management platform, a smart gas indoor device sensing network platform, and a smart gas indoor device object platform. The smart gas user platform is configured as a terminal device; the smart gas indoor device sensing network platform is configured as a plurality of groups of gateway servers or a plurality of groups of intelligent routers; the smart gas indoor device object platform includes a safety valve control device object sub-platform, the safety valve control device object sub-platform is configured as indoor gas devices and gas safety detection devices; and the smart gas safety management platform includes a smart gas indoor safety management sub-platform and a smart gas data center.

The invention discloses an on-line monitoring device and method for tiny leakage of a safety valve, in the on-line monitoring device, a variable reluctance type power generation device is placed in a detection pipeline, an electric control device is arranged on the detection pipeline and is connected with the variable reluctance type power generation device through a wire, and a float flowmeter is connected with the detection pipeline through a threaded hole. The float flowmeter is connected with the automatic opening and closing device; when large-flow airflow passes through the detection pipeline, the float flowmeter controls the automatic opening and closing device to be opened through upward movement of a float. After the relief of the safety valve is completed, the electric control device sends an electric signal to the second coil to control the closing of the automatic opening and closing device; at the moment, the gas flow is calculated through the induced electromotive force of the coil; when small-flow airflow passes through the detection pipeline, the gas flow is calculated through the displacement of a floater in the floater flowmeter. On the premise that normal relief of the safety valve is not affected, flow measurement of two working conditions of fault leakage and overpressure relief of the safety valve is completed, and the detection efficiency is high.

The invention belongs to the technical field of gas production wellhead devices, and particularly relates to an ultrahigh pressure gas production wellhead device without any rubber seal, which comprises a four-way pipe, a manual gate valve, a throttle valve, an instrument flange, an anti-shock pressure gauge, a hydraulic safety valve, a separation pressure reduction assembly, an upper flange, a casing head body and a casing hanger assembly, a sealing gasket ring I and a sealing gasket ring II are respectively arranged between the upper flange and the casing hanger assembly, and the casing hanger assembly is respectively connected with an inner cavity of the casing head body through an inner metal sealing ring I, an outer metal sealing ring I, an inner metal sealing ring II and an outer metal sealing ring II. Compared with rubber sealing, the metal sealing structure has higher stability. And the metal sealing element can bear high pressure and cannot generate permanent deformation or lose sealing capacity, so that the gas production device can be suitable for a worse gas production working condition, the frequency of shutdown maintenance caused by damage of the sealing element is reduced, and the continuity and efficiency of gas production operation are improved.

The utility model discloses a hydraulic logic control system for a sidesway distance adjusting fork. Comprising an oil pump, a safety valve, a first reversing valve plate, a logic control valve block, a first hydraulic control one-way valve, a first three-way pipe, a right pallet fork distance adjusting oil cylinder, a left pallet fork distance adjusting oil cylinder, a first overload valve, a second hydraulic control one-way valve, a second three-way pipe, a third three-way pipe, a third hydraulic control one-way valve, a throttling valve, a second reversing valve plate and a second overload valve. The logic control valve block comprises a second hydraulic control one-way valve, a third hydraulic control one-way valve, a throttling valve and a second overload valve, and the second hydraulic control one-way valve, the third hydraulic control one-way valve, the throttling valve and the second overload valve are communicated through pipelines. And the first reversing valve plate is communicated with the second reversing valve plate. According to the hydraulic logic control system for the laterally-moving distance adjusting fork, the purpose of hydraulic oil way regulation and control is achieved through the arrangement of the structure.

The invention discloses a safety valve service life evaluation method based on pressure history statistics and dynamic damage accumulation. According to the method, only safety valve inlet pressure time sequence data is needed, a load cycle is extracted through an improved rain flow counting method, and the nonlinear damage increment is calculated according to an S-N curve model dynamically degraded along with the accumulated damage degree. According to the method, a self-adaptive failure probability threshold is established based on historical failure data, and probabilistic prediction of the residual life is realized. The model is clear in physical significance, only needs a single data source, significantly reduces the implementation complexity and cost, greatly improves the precision of life prediction by considering the degradation of material performance, and is especially suitable for predicting the accelerated failure risk of the safety valve in the later period of long-term service.

The invention discloses an AI-assisted self-adaptive control method and system for a gas safety valve, and relates to the technical field of gas safety control, and the method comprises the following steps: connecting the output end of an SEPIC circuit containing a continuous current mode and a discontinuous current mode with a coil of the gas safety valve; according to preset electrical and gas safety indexes, asynchronous data acquisition is carried out on the electrical and gas safety indexes, and an electrical and gas safety index sequence is obtained; utilizing an AI fusion analyzer on the edge MCU to perform interactive feature fusion analysis on the two types of sequences, and determining a self-adaptive control scheme of the gas safety valve; circuit modes are switched based on the control scheme, and the safety valve is driven to execute according to the switched SEPIC circuit. The technical problems that in traditional gas safety valve control, electric parameters and gas safety indexes are analyzed in a split mode, the circuit operation mode is single, and control response is inaccurate are solved, and the technical effects that efficient and reliable self-adaptive driving of the gas safety valve is achieved, and gas use safety and control flexibility are improved are achieved.

The invention discloses a full-automatic checking device and method for a low-temperature gas cylinder safety valve, and belongs to the technical field of safety valve checking. The full-automatic checking device comprises a checking table, a to-be-checked feeding area, a checking area and a checked discharging area are arranged on the table top of the checking table, a gas path system and a control system are arranged in the checking table, and the to-be-checked feeding area is provided with a feeding assembly; the verification area is provided with a mechanical arm and a plurality of clamping testing mechanisms, and the detected discharging area is provided with an unqualified product box and a qualified product box. Automatic feeding and discharging in the safety valve checking process are achieved through the mechanical arm and the control system, before checking, the mechanical arm grabs the safety valve from the material disc and places the safety valve on the clamping testing mechanism, after checking is finished, the mechanical arm takes down the safety valve and automatically sorts the safety valve into a qualified product box or an unqualified product box, manual participation is not needed, manual labor is reduced, and the working efficiency is improved. The utilization rate of verification personnel is improved, the safety risk of the verification personnel is effectively avoided, the six clamping test mechanisms can work at the same time, the average verification time of a single valve is greatly shortened, and the verification efficiency is improved.

The invention discloses a hydrogen charging system and method for a magnesium-based solid hydrogen storage reaction kettle. A hydrogen storage tank is placed in each placement position in an inner cavity of the reaction kettle, and a heat exchange coil pipe is arranged outside each placement position; the hydrogen charging system comprises a hydrogen charging part, a temperature control part and a safety protection part; the hydrogen filling part comprises a hydrogen filling main pipeline; a hydrogen flow controller and a hydrogen heat exchanger are arranged on the hydrogen filling main pipeline; the temperature control part comprises an external heat-conducting oil circulating system, the external heat-conducting oil circulating system comprises a heat-conducting oil tank, a flow bypass pipeline is arranged between the oil inlet pipeline and the oil return pipeline, and a heat-conducting oil shunting automatic switch valve is arranged on the flow bypass pipeline; the safety protection part comprises a safety valve arranged on the reaction kettle, the safety valve is externally connected with an emptying pipeline, a pressure relief bypass pipeline is arranged between the emptying pipeline and the hydrogen filling main pipeline, and an automatic opening and closing pressure relief valve is arranged on the pressure relief bypass pipeline. The system has the advantages that the hydrogen storage tanks in the reaction kettle can be quickly and efficiently filled with hydrogen, and the safety of the system is ensured.

Provided is a magnet for use with an SSSV, an SSSV, a well system, and a method. The magnet, in one aspect, includes an electropermanent magnet. The magnet, in accordance with this aspect, further includes a self-powered protection circuit coupled to the electropermanent magnet, the self-powered protection circuit configured to switch the electropermanent magnet to the OFF state when the SSSV loses power.

The invention belongs to the technical field of compressed air control, and particularly relates to a compressed air energy storage power station multistage protection and controlled discharge control method and system. Comprising the steps that a compressed air energy storage power station system comprising a discharge bypass and a discharge valve and a safety valve which are arranged on the downstream of the discharge bypass is built; when pressure abnormity occurs, first-stage response is started, operation parameters of the compressed air energy storage power station system are adjusted, or a discharge bypass is started in an overlapped mode, and the pressure abnormity trend is restrained; when the first-stage response cannot restrain pressure abnormity, the second-stage response is started, the opening degree of the release valve is adjusted, and gas release is conducted; and when the second-level response cannot restrain pressure abnormity, third-level response is started, a stepped release sequence is adopted, the opening degree of a release valve is increased, meanwhile, the opening degree of a safety valve is gradually increased to conduct gas release, and finally final release is conducted by triggering a rupture disk. According to the invention, through a stepped control strategy, the defects that a single protection device is single in protection means and easy to over-excite protection are avoided.

The utility model provides a gas safety valve with a liquid blocking function under an inverted flight working condition of an airplane. The gas safety valve comprises an upper component and a lower component, the upper assembly comprises a shell, a lining, a sealing disc and a spring. The lower component comprises a sliding sleeve, a base, a first sealing ring and a second sealing ring; the upper component and the lower component are fixedly connected through a bolt, a gasket and a nut; the bushing is arranged in the center of the top of the shell; the end part of the sealing disc guide shaft penetrates through the center of the bushing; a sliding sleeve is arranged in the base. When the aircraft is in an inverted flying condition, the fuel tank can prevent fuel from flowing out of the fuel tank.