4599 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.

The utility model relates to the technical field of sulfuric acid filtering equipment, and discloses a refined sulfuric acid filter which comprises a filter tank body, a discharge pipe fixedly mounted at the lower end of the filter tank body, a feed pipe fixedly mounted on the outer side of the filter tank body, and a pressure gauge fixedly mounted on the filter tank body above the feed pipe, a safety valve is further fixedly installed at the position, above the pressure gauge, of the filter tank body, a top cover is fixedly installed on the filter tank body, two pore plates are fixedly installed in the filter tank body, a plurality of filter elements are fixedly installed between the two pore plates, and a lifting plate is movably connected between the filter elements. The lifting plate is arranged among the filter elements, the sleeve holes are formed in the inner side of the lifting plate, the arc-shaped scrapers which are arranged in a staggered mode are arranged on the inner sides of the sleeve holes, and elastic supporting of the inserting rings and the arc-shaped supporting mechanisms is matched, so that adhesion layers on the outer surfaces of the filter elements can be automatically cleaned by means of high-low changes of the liquid level of a medium in the filter tank body; the filtering effect of the filter element is improved and the service life of the filter element is prolonged.

The invention provides an automatic judgment device for a safety valve and a verification method, and relates to the technical field of safety valve verification. The automatic judgment device comprises clamping seats which are provided with an air inlet valve and a pressure release valve, are arranged at intervals along a first horizontal direction and are used for fixing a safety valve to be tested, the translation assembly comprises a connecting piece, and the end part of the connecting piece is provided with a sealing plate matched with the safety valve to be tested for sealing; the reversing valve is arranged to be communicated with an outlet of the safety valve to be tested and alternatively communicated with the flow sensor or the bubble meter, and the adjusting piece of the adjusting assembly is arranged to drive the sealing plate to adjust the preset angle until the sealing plate is sealed with the safety valve to be tested, and the limiting piece is controlled to move to abut against the sealing plate. The first driving mechanism is arranged to drive the sealing plate to move to selectively seal the safety valve to be tested so as to verify the setting pressure or the sealing performance of the safety valve to be tested. According to the automatic judgment device, the angle of the sealing plate can be adjusted, so that the sealing performance is improved, and the stability of the sealing plate is guaranteed.

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.

An insert valve installed, at least partially, in a safety valve that includes a flow port disposed on an exterior of the insert valve, a poppet configured to control a fluid flow through the flow port, a piston rod, disposed uphole from the poppet, configured to move the poppet past at least part of the flow port, where the piston rod includes an upper exposed piston area exposed to an internal volume of the insert valve, and a lower exposed piston area exposed to the internal volume of the insert valve, and a hydraulic control port configured to control movement of the piston rod.

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 invention discloses a battery thermal runaway early warning method, device, system, equipment, medium and product, and relates to the technical field of energy storage safety. The method comprises the following steps: firstly, processing a safety valve pressure relief and exhaust sound signal, a PACK box vibration signal and a thermal runaway significant signal which are obtained by monitoring in a latest unit time period so as to obtain thermal runaway identification probabilities corresponding to the sound vibration signal and the significant signal respectively; then, according to the probabilities, calculating to obtain a posterior probability under each thermal runaway judgment condition combination, and finally, taking a certain thermal runaway judgment condition combination corresponding to the maximum posterior probability as a battery thermal runaway early warning decision basis for the target battery and outputting the battery thermal runaway early warning decision basis. In this way, it can be ensured that the finally obtained battery thermal runaway posterior probability is obviously larger than the battery thermal runaway posterior probability obtained based on any single monitoring signal, and the battery early-stage thermal runaway detection capacity is greatly 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 invention discloses a hydraulic system and an injection molding machine, the hydraulic system is applied to the injection molding machine, the hydraulic system comprises a glue injection control loop and a mold locking control loop, the glue injection control loop comprises a hydraulic lock, a plurality of reversing valves, a first cartridge valve, an overflow valve and a first proportional overflow valve, the injection device is arranged to inject plastic in a molten state into a mold cavity at preset pressure and speed; and the mold locking control loop is connected with the glue injection control loop, comprises a second proportional overflow valve, a plurality of reversing valves, a second cartridge valve, a shuttle valve and a safety valve, and is used for locking the mold at a preset pressure and maintaining the pressure. The injection molding machine solves the problem of low production efficiency of plastic products of an injection molding machine in the prior art.

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.

A safety valve for a wellbore for production of hydrocarbons from a surrounding subsurface formation includes a flow tube through which a flow of fluids from the surrounding subsurface formation downhole to a surface of the wellbore, wherein the flow tube comprises a lower end through which the flow of fluids is to enter the flow tube, wherein the flow tube is composed of metal, except for at least a cut out section of the lower end that is composed a polymeric material. The safety valve includes a flapper configured close the safety valve by changing positions to cover an opening at the lower end of the flow tube such that an impact force of the closing on the flapper onto the flow tube is at least partially absorbed by the polymeric material.

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 utility model relates to the technical field of spring type safety valves, and discloses a spring type safety valve capable of recovering media, which comprises a base flange plate, the top of the base flange plate is communicated and connected with a valve seat, the top of the valve seat is slidably connected with a recoil disc, the inside of the recoil disc is fixedly connected with a valve rod, and the valve rod is fixedly connected with a valve rod. The top face of the base flange plate is connected with a valve body in a screwed mode through bolts and nuts, and the top of the valve body is fixedly connected with a guide pipe. According to the spring type safety valve capable of recycling the medium, through the arrangement of the medium recycling and metering assembly, when the medium is subjected to pressure relief and export through the spring type safety valve, the medium flows out through the flow metering pipe, and a gas flow sensor arranged in the flow metering pipe monitors the flow of the medium; and the conversion controller converts the medium flow into a numerical value to be displayed on the flow display screen, so that the amount of the recycled medium can be accurately monitored, the production process is controlled and optimized, the cost control is improved, and the sustainability of the recycled medium is ensured.

The invention innovatively provides a micro-channel solid hydrogen storage thermal management system which comprises a pressure controller, a safety valve, a circulating pump, a ball valve, a micro-channel reactor, a three-way ball valve and a cooler, and the specific structure is as follows: the safety valve, the circulating pump, the ball valve, the micro-channel reactor, the three-way ball valve and the cooler are sequentially communicated through pipelines to form a loop; a hydrogen outlet of the pressure controller is communicated with a pipeline between the safety valve and the cooler, a hydrogen inlet of the pressure controller is connected with a hydrogen source, and one port of the three-way ball valve is a hydrogen outlet.

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.

The invention provides a double-valve shock absorber and a suspension system.The shock absorber comprises a liquid storage barrel and a piston rod, an energy storage device cavity and a working cylinder are arranged in the liquid storage barrel, the interior of the working cylinder is divided into a recovery cavity and a compression cavity through a piston on the piston rod, and a safety valve is arranged on the piston; a bottom valve is arranged on the working cylinder; a rebuilt valve and a compression valve are arranged outside the liquid storage cylinder, the rebuilt valve comprises a first one-way electromagnetic valve and a rebuilt oil cavity, the rebuilt oil cavity is communicated with a rebuilt cavity, the rebuilt oil cavity is communicated with the energy storage device cavity through the first one-way electromagnetic valve, the compression valve comprises a second one-way electromagnetic valve and a compressed oil cavity, and the compressed oil cavity is communicated with the energy storage device cavity. The compressed oil liquid cavity is communicated with the recovery cavity through a second one-way electromagnetic valve, and the recovery oil liquid cavity is communicated with the compressed oil liquid cavity through conveying equipment. Stepless damping adjustment can be achieved, the wheels can be actively lifted, damping can be adjusted in real time according to different driving conditions when a vehicle is applied, the height of a vehicle body is adjustable, and the driving experience is optimized.

The invention discloses a low opening and closing pressure difference safety valve for ultrahigh-temperature large-flow fuel oil steam media for spaceflight, which comprises a shell, an inlet pipe nozzle, an inlet locking nut, a large-flow valve core, a low-rigidity spring, a spring seat, a locking nut and an adjusting nut are arranged in the shell from front to back, and a flexible graphite sealing ring is embedded at the tail end of the inlet pipe nozzle. The large-flow valve element slides in the shell in the axial direction, and the front end of the large-flow valve element is designed to be an arc-shaped conical surface matched with an arc chamfer. The two ends of the spring abut against the spring seat and the tail of the large-flow valve element respectively, a safety valve exhaust hole is formed in the front end of the shell, and the safety valve exhaust hole is communicated with an inlet of the inlet pipe nozzle when the large-flow valve element is in a retreating state. The pressure relief function of a 380 DEG C ultra-high-temperature fuel oil steam medium can be achieved, the ultralow opening and closing pressure difference of 0.005 MPa under the dynamic and static environments is achieved, and the exhaust stability is guaranteed under the vibration and impact environments.

A flexible energy-saving speed limit control system for free anchoring of a large anchor winch includes an anchor winch brake oil cylinder, a one-way throttle valve, a two-position four-way electromagnetic reversing valve, a pressure reducing valve, a clutch oil cylinder, a pressure gauge, a one-way valve, and a main safety valve; the oil outlet of the hydraulic pump is connected to the P port of the main safety valve through a one-way valve on one side, and is connected to the working oil chamber of the anchor winch brake oil cylinder through a pressure reducing valve, an electromagnetic reversing valve, and a one-way throttle valve on the other side; the oil suction port is connected to the hydraulic oil tank through a hydraulic pipeline, the clutch oil cylinder is connected to the two-position four-way electromagnetic reversing valve and the pressure reducing valve, and a one-way throttle valve is installed on the clutch oil cylinder. The system can automatically adjust the electric proportional overflow valve at the pump outlet, thereby adjusting the size of the braking force. When the large anchor winch is anchored, the speed is limited within the required range to avoid impact and loss of control.