38 results about "Hydrogen valve" patented technology

The invention discloses a high-pressure hydrogen valve with high sealing performance, and belongs to the technical field of high-pressure hydrogen valves. The high-pressure hydrogen valve with the high sealing performance comprises a connecting valve body, and an auxiliary flow guide plate is arranged and is overturned upwards, so that the pressure at the position of a sealing head is reduced; by arranging the structure of the inner adjusting cylinder, the pressure of the position of the communicating groove is shared, vibration caused by sudden change of the internal pressure is avoided, by arranging the structure of the buffer plate, the pressure of hydrogen impact is changed into elastic potential energy to be absorbed, and meanwhile in the process of pushing the damping push plate, the damping effect is improved. By arranging the structure of the indicating push rod, magnetic repulsive force can horizontally push the magnetic piece and the indicating push rod to move forwards, whether the internal pressure exceeds the safety range or not can be observed according to the moving distance of the indicating push rod, and maintenance is convenient.

The invention discloses a vibration suppression hydrogen valve. A vibration mode is monitored in real time through a high-precision acceleration sensor array, an anti-phase excitation signal is generated through a self-adaptive control algorithm, mechanical resonance caused by high-pressure hydrogen flow is suppressed, the vibration amplitude is reduced, the service life of the valve is prolonged, and meanwhile, noise and energy loss of a hydrogen system are reduced. The vibration mode is monitored in real time through the high-precision acceleration sensor array, an anti-phase excitation signal is generated through a self-adaptive control algorithm, mechanical resonance caused by high-pressure hydrogen flowing is restrained, the vibration amplitude is reduced, the service life of a valve is prolonged, and meanwhile the noise and energy loss of a hydrogen system are reduced.

The invention discloses a hydrogen production system safety linkage control method based on multistage hydrogen concentration threshold values. The method comprises the steps that S1, hydrogen concentration detection values of all areas of a hydrogen production system are collected in real time; s2, threshold value judgment: comparing a detection value with a plurality of preset concentration threshold values; s3, executing a corresponding linkage control action according to a comparison result: when a detection value reaches or exceeds a first-level threshold value, triggering a first-level response, and executing alarm starting and accident exhaust; when the detection value reaches or exceeds a second-level threshold value, triggering a second-level response, executing the action of the first-level response, and additionally cutting off a hydrogen valve in an associated area; when the detection value reaches or exceeds a third-level threshold value, third-level response is triggered, the action of second-level response is executed, and emergency shutdown of the starting system is increased; according to the method, early warning, hierarchical control and emergency protection of the hydrogen leakage risk are achieved, and unnecessary interference on production is reduced on the premise that safety is guaranteed.

The utility model discloses a fuel cell hydrogen valve with a safety discharge function, which comprises a valve body, a valve core, a valve core, a valve core and a valve core, the air inlet pipe is arranged at the first end of the channel; the air outlet pipe is arranged at the second end of the channel and used for being communicated with the container; the adjusting assembly is arranged in the channel and used for controlling communication or blocking between the air inlet pipe and the air outlet pipe; the pressure relief assembly is arranged on the side, close to the gas outlet pipe, of the channel and used for releasing hydrogen when the pressure in the container is too large. According to the fuel cell hydrogen valve with the safety relief function, provided by the invention, the charging of hydrogen can be realized through the valve, and a certain amount of hydrogen can be released through the pressure relief assembly when the pressure of hydrogen in a container is too high, so that the safety is improved.

The invention discloses an automatic emptying system for gas leakage of a hydrogen container, which relates to the technical field of new energy, and comprises a sensor group, a hydrogen valve group, an emergency stop equipment group, a sound-light alarm group and an inert gas valve group which are in signal connection with a controller group, and a container module is provided with a hydrogen cylinder group and an inert gas cylinder group, the hydrogen valve sets are arranged at the joints of hydrogen cylinders of the hydrogen cylinder set, the inert gas valve sets are arranged on the gas cylinders of the inert gas cylinder set, a hydrogen output pipeline and a hydrogen input pipeline are arranged on the side face of the container module, an inert gas input pipeline is further arranged on the side face of the container module, and an emptying structure is arranged at the top of the container module. The emptying structure is a cuboid protrusion, and a plurality of emptying openings are formed in the four side edges of the emptying structure in an arrayed mode. The inert gas cylinder group is controlled by the sensor group and the controller group to quickly release inert gas to discharge leaked hydrogen out of the container module, and the container module is filled with the inert gas for protection.

The application provides a hydrogen valve flow control method and system, relates to the technical field of high-pressure hydrogen valves, and comprises the following steps: acquiring operation parameters of a valve in real time, including valve core displacement, inlet pressure, outlet pressure and real-time flow passing through the valve; at least one key characteristic parameter of a flow field in the valve under a current state is calculated based on the operation parameters, whether the current position of the valve core is in a key adjustment area is judged; if yes, an optimized motion trajectory instruction for the valve core is dynamically generated based on a model predictive control algorithm, with the goal of minimizing system pressure oscillation and valve core impact; the optimized motion trajectory instruction is executed, the valve core is controlled to move according to the corresponding optimized motion trajectory, and the working state of a flow guide component is adjusted coordinately. The application can generate an optimized valve core motion trajectory before severe pressure oscillation occurs, greatly reduce the dynamic load on the pressure impact and the valve core, and improve the service life and safety of the valve and the pipeline system.

The invention discloses a method for removing a coating on the inner wall of MPCVD equipment, which specifically comprises the following steps: mixing an alcoholic solution and an aqueous solution, and putting the mixture into a bubbling device; closing a door of the cavity of the MPCVD equipment, and vacuumizing the cavity; opening a hydrogen valve on the bubbling device, enabling hydrogen to enter the bubbling device, enabling the hydrogen to carry the volatilized alcohol-water mixed solution to enter a reaction chamber of the MPCVD equipment, placing a molybdenum sheet on a sample table, starting microwaves, and activating plasmas; the temperature of the molybdenum sheet, the microwave power and the pressure are increased; the microwave and hydrogen valves are closed; the temperature of the molybdenum sheet is reduced; the cavity door of the equipment is opened; according to the method, hydrogen is utilized for bubbling, the aqueous solution with certain volatility is brought into the reaction cavity, the bonding strength of the coating and the inner wall of the equipment is remarkably reduced under the high-temperature condition, and the coating on the inner wall of the equipment can be efficiently removed after simple purging of an air gun.

The utility model relates to the technical field of hydrogen valves, and discloses a hydrogen valve with a safety protection function, which comprises a main body mechanism, a protection mechanism is fixedly arranged on the outer surface of the main body mechanism, a connecting mechanism is fixedly arranged on the outer surface of one side of the main body mechanism, and the connecting mechanism comprises a connecting block. A second sliding groove is formed in one side of the connecting block, a first sliding groove is formed in the middle of the upper surface of the connecting block, two sliding blocks are arranged in the second sliding groove in a sliding mode, and two first fixing rotary knobs are arranged in the first sliding groove in a sliding mode. According to the device, through the arrangement of the connecting mechanism and the protection mechanism, when a user uses the device, the whole valve can be fixedly installed at the position where the device needs to be used through the connecting mechanism, protection is provided for the whole exterior of the device through the protection sleeve, and the whole valve is prevented from being impacted and eroded by the external environment when the device is used; and therefore, the safety of the whole device during use is improved.

The present invention discloses a room-temperature solid-state hydrogen storage and supply system for small-scale distributed power generation, comprising a room-temperature solid-state hydrogen storage subsystem, a water circulation subsystem, and a hydrogen pipeline subsystem. The room-temperature solid-state hydrogen storage subsystem comprises a room-temperature solid-state hydrogen storage device, a hydrogen valve, a hydrogen storage temperature sensor, and an electric heating device. The water circulation subsystem comprises a water chiller, a solar water heater, a water circulation pump, and a circulating water temperature sensor. The hydrogen pipeline subsystem comprises a mass flow controller, a first pressure reducing valve, a second pressure reducing valve, an emergency hydrogen discharge valve, a safety valve, and a pressure transmitter. The water circulation pump can switchably provide circulating cold water or circulating hot water to the room-temperature solid-state hydrogen storage device through a water chiller or a solar water heater. The hydrogen pipeline subsystem can switchably perform a hydrogen absorption process or a hydrogen release process. The room-temperature solid-state hydrogen storage and supply system of the present invention is suitable for small-scale distributed power generation application scenarios with relatively stable hydrogen absorption and release flow rates, and has the advantages of high density, simple structure, low cost, and high safety.

The invention discloses an anti-leakage hydrogen valve, which belongs to the technical field of valves, and comprises a transverse pipe, and further comprises multi-angle mounting mechanisms, two bidirectional sealing mechanisms, a non-contact driving mechanism and a synchronizing mechanism, the two multi-angle mounting mechanisms are mounted on the left side and the right side of the transverse pipe, the two bidirectional sealing mechanisms are mounted on the middle side of the transverse pipe, and the non-contact driving mechanism is mounted on the middle side of the transverse pipe. The non-contact driving mechanism is installed on the two-way sealing mechanism, the synchronizing mechanism is installed on the non-contact driving mechanism, the non-contact driving mechanism comprises an inner shell, an inner rotating disc, an outer shell, an outer rotating disc and a permanent magnet, the inner shell is fixedly installed on the outer shell, the inner rotating disc is rotationally connected to the upper side of the inner shell through a rotating shaft in a sealed mode, and the outer rotating disc is fixedly installed on the outer shell. And the outer shell is fixedly mounted on the upper side of the inner shell. By means of the mode, leakage caused by aging of a sealing part during opening and closing of the valve can be avoided through non-contact transmission, and the valve can be installed without dividing an inlet and an outlet through double sealing.

The utility model provides a fluid system of a fuel cell and a fuel cell stack, the fluid system of the fuel cell comprises a valve device and a controller, and a bipolar plate of the fuel cell comprises a flow channel group; a first end of the flow channel group is connected with a first interface of the valve device, a second end of the flow channel group is connected with a second interface of the valve device, a third interface of the valve device is used for inputting oxygen and hydrogen, and a fourth interface of the valve device is used for outputting output fluid; the controller is used for controlling the valve device to be switched between the first state and the second state. When the valve device is in the first state, the first connector communicates with the third connector, and the second connector communicates with the fourth connector. When the valve device is in the second state, the first connector communicates with the fourth connector, and the second connector communicates with the third connector. According to the technical scheme, the temperature, the pressure and the current density in the runner group of the bipolar plate can be kept relatively balanced, so that the durability and the stability of the fuel cell are improved.

The invention provides a Ni-W-P-graphene gradient chemical plating layer for a 70 MPa hydrogen storage valve body and a preparation method of the Ni-W-P-graphene gradient chemical plating layer, the total thickness of the plating layer is 15-25 microns, and the plating layer adopts a continuous gradient structure of an inner layer high-P region, an outer layer low-P high-W region and a gradient transition region; the outer layer contains 3-7 wt% of P, 6-12 wt% of W and 0.2-1.0 wt% of graphene; and the transition area realizes continuous gradual change of components to eliminate interface stress. A single-groove gradient injection process is adopted for preparation, the inner layer is deposited for 0-60 min, low-P high-W mother liquor and graphene dispersion liquid are injected for 60-75 min, the outer layer is deposited for 75-90 min, and 160-240 DEG C vacuum heat treatment is matched. The hydrogen permeation current density of the plating layer in a 70 MPa pure hydrogen environment is reduced by more than or equal to 90% compared with that of a bare material, the plating layer is free of white rust after salt mist for 1000 h and free of peeling after 1000 times of thermal circulation, the plating layer and the surface of the valve body can construct a gradient protection structure with low hydrogen permeation, high hardness, corrosion resistance and wear resistance, and the long-term service reliability is improved. And the preparation process is compatible with an existing chemical plating line, additional equipment is not needed, and the method is suitable for batch production of high-pressure hydrogen valves.

The invention discloses a shut-down method of a diesel oil liquid phase hydrogenation device, which comprises the following steps: (1) firstly reducing the feeding temperature of a diesel oil raw material, introducing supplementary hydrogen into the diesel oil liquid phase hydrogenation device by a new hydrogen compressor at the same time, stopping feeding the diesel oil raw material after the reaction temperature is reduced, introducing light distillate oil to wash each catalyst bed layer in a reactor, and stopping feeding the light distillate oil after the reaction temperature is reduced; after the washing is finished, stopping injecting the light distillate oil; (2) closing a supplemental hydrogen valve, enabling supplemental hydrogen to pass through the heating furnace and the gas-liquid mixer, enabling the heated supplemental hydrogen to enter from the top of the reactor to perform first purging, then introducing part of fuel gas of the heating furnace into a catalyst bed layer at the lower part of the reactor to perform second purging, stored oil of the lower bed flows out from the bottom of the reactor under the combined action of supplementary hydrogen and fuel gas. According to the method, the oil carrying effect of the catalyst during shutdown is effectively improved, the purging time is shortened, and the shutdown process of the liquid-phase hydrogenation device can be rapidly completed.

The application discloses a hydrogen pipeline venting system deflagration and tempering test system and method, relates to the technical field of pipeline testing, and comprises a premixing and concentration adjusting system, an adjustable release system, an along-path temperature and pressure detection system and a visual tempering detection system. The premixing and concentration adjusting system is arranged to simulate the hydrogen-air premixing state in the venting pipeline caused by hydrogen valve internal leakage. The adjustable release system is arranged to simulate the hydrogen spontaneous combustion state under different release rates. The adjustable release system is arranged to test the influence of different pipe diameter specifications and pipe fitting setting modes on the pressure rise in the deflagration process. The along-path temperature and pressure detection system is arranged to test the spontaneous combustion condition in the venting pipeline and also to test the influence of different pipe diameters and pipe fitting structures of the venting pipeline on the deflagration overpressure. The visual tempering detection system is established to test the tempering scale after ignition and combustion, so as to provide a relief strategy.

The present invention discloses a valve performance detection system and method, relating to the field of valve detection, for detecting the performance of high-pressure hydrogen valves. The method comprises installing vibration sensors on the valve seat and valve outlets on both sides of the high-pressure hydrogen valve, detecting vibration signals at different opening strokes with and without tapping the valve, performing data processing, and evaluating the degree of hydrogen cavitation based on a physical information fusion LSTM model, thereby obtaining valve material performance detection results. The present invention achieves effective long-term assessment of hydrogen embrittlement in high-pressure hydrogen valves. During the assessment, vibration signal data is enhanced based on the spatial correlation of the vibration spectrum of multiple vibration signals after hammering, effectively improving the accuracy of the assessment results. Furthermore, the assessment of hydrogen cavitation based on the physical information fusion LSTM model addresses the problem that the assessment results of traditional models do not conform to physical laws.

The invention provides a hydrogen valve flow control method and system, and relates to the technical field of high-pressure hydrogen valves, and the method comprises the following steps: obtaining operation parameters of a valve in real time, including valve core displacement, inlet pressure, outlet pressure and real-time flow passing through the valve; calculating at least one key characterization parameter of a flow field in the valve in the current state based on the operation parameters, and judging whether the current position of the valve element is in a key adjusting area or not; if yes, an optimized movement track instruction for the valve element is dynamically generated based on a model predictive control algorithm by taking minimization of system pressure oscillation and valve element impact as targets; and executing the optimized motion trail instruction, controlling the valve element to move according to the corresponding optimized motion trail, and cooperatively adjusting the working state of the flow guide component. According to the application, an optimized valve core movement track can be generated before violent pressure oscillation occurs, so that the pressure impact and the dynamic load on the valve core are greatly reduced, the service life of the valve and a pipeline system is prolonged, and the safety of the valve and the pipeline system is improved.

The utility model relates to the technical field of dilute nitric acid production, in particular to a fast hydrogen igniter device of a dilute nitric acid oxidation furnace, which comprises an explosion-proof junction box, a special ignition cable and an igniter, the bottom of the explosion-proof junction box is fixedly connected with the special ignition cable, and the other end of the special ignition cable is fixedly connected with the igniter. A power line is fixedly connected to one side of the bottom of the igniter; one side of the explosion-proof junction box is fixedly connected with a pipeline, one end of the pipeline is fixedly connected with flange plates, and the flange plates are connected through screws. An ignition rod and a hydrogen pipeline which are distributed up and down are arranged in the pipeline, and a hydrogen valve is mounted on the outer side of the hydrogen pipeline; according to the utility model, the igniter is started, the ignition rod is used for ignition, the hydrogen valve is opened, the hydrogen is discharged, and ignition can be carried out in time, so that the hydrogen ignition speed is higher, the oxidation furnace can be ignited more quickly, the gas emptying time is short, and the environmental pollution is smaller.

The present application belongs to the hydrogen / hydrogen valve processing technology field, and specifically relates to a hydrogen / hydrogen valve butt joint end processing technology, comprising the following steps: step a, selecting a valve body material, and forming a valve body blank by integral die forging processing; step b, finishing the surface of the valve body blank to form a valve body; step c, processing the butt joint end of the valve body according to the prefabricated size; and step d, extruding the butt joint end of the valve body by an extrusion die. The integral die forging valve butt joint end extrusion variable diameter forming process adopted by the present application is a brand new valve manufacturing technology, and the integral valve extrusion variable diameter forming manufacturing process is adopted to overcome the traditional hydrogen / hydrogen valve butt joint welding joint process, to solve the problems of valve sealing leakage, hydrogen corrosion cracking of the welding seam and the like, and to improve the valve quality and avoid the hazards caused by hydrogen leakage.

The utility model discloses a solid hydrogen storage aluminum tank structure with an internal heating function. The solid hydrogen storage aluminum tank structure comprises an aluminum tank body. A hydrogen valve is mounted at one end of the aluminum pot body, and a heating assembly is mounted at the other end; a first sealing ring is arranged between the hydrogen valve and the aluminum pot body; a sintering filter element is arranged at one end, extending into the aluminum tank body, of the hydrogen valve; one end of the heating assembly extends into the aluminum pot body, and the other end of the heating assembly is installed on a bottle opening of the aluminum pot body through a second sealing ring. The aluminum pot body is filled with hydrogen storage alloy. According to the aluminum pot, the heating assembly is installed in the aluminum pot body, heat in the electric heating process can be absorbed by alloy, compared with a conventional heating patch, the heat utilization rate is greatly increased, meanwhile, hydrogen released in the aluminum pot body and power generated by a fuel cell can be supplied to the heating assembly to maintain the temperature in the aluminum pot body, and the service life of the aluminum pot body is prolonged. Dynamic balance in the operation process is achieved, power consumption is reduced, the use requirements of products can be better met, and the competitiveness of enterprises is improved.

The present invention discloses a fully immersed fuel cell mobile vehicle-mounted hydrogen storage system, which relates to the fields of clean energy application and transportation. It includes a water-sealed container, a hydrogen storage tank, and a hydrogen fuel cell; a hydrogen valve is provided on the water-sealed sleeve. By placing the entire vehicle-mounted hydrogen storage system containing hydrogen and its connected hydrogen pipeline completely underwater or in water, the air and harmful static electricity and open flames are isolated, thereby greatly improving the safety of fuel cell vehicles. The present invention also relates to a method for using such a fully immersed fuel cell mobile vehicle-mounted hydrogen storage system.

The invention discloses a control method of a hydrogen supply system of a hydrogen internal combustion engine and a vehicle, the hydrogen supply system of the hydrogen internal combustion engine is applied to the vehicle, the hydrogen supply system of the hydrogen internal combustion engine comprises N hydrogen cylinders, a main hydrogen valve and N cylinder valves arranged in one-to-one correspondence with the hydrogen cylinders, N is larger than 1 and is an integer, and each hydrogen cylinder is in pipeline connection with one end of the main hydrogen valve through the corresponding cylinder valve; the other end of the main hydrogen valve is connected with the hydrogen internal combustion engine through a pipeline, and the control method of the hydrogen internal combustion engine hydrogen supply system comprises the steps that a key signal of a vehicle is obtained; the key signal comprises an ON gear signal, a START gear signal, an ACC gear signal and an OFF gear signal; the main hydrogen valve is controlled to be opened or closed at least according to the key signal, the opening number of the cylinder valves is controlled, the starting speed of the hydrogen internal combustion engine can be effectively increased, the knocking phenomenon caused by insufficient hydrogen in the initial stage after the hydrogen internal combustion engine is ignited can be avoided, and the driving experience can be effectively improved.

The invention relates to the technical field of hydrogen storage, in particular to a hydrogen valve with an anti-leakage function, which comprises a valve body, a valve core and a valve rod, the valve core is fixed at one end of the valve rod and positioned in the valve body, the other end of the valve rod extends out of the valve body and is in threaded fit with the valve body, and the hydrogen valve further comprises a sealing shell, a hydrogen sensor and an operating device; the sealing shell is arranged on the valve body, a sealing operation cavity is formed in the sealing shell, and the end, away from the valve element, of the valve rod extends into the sealing operation cavity. The hydrogen sensor is arranged in the sealed operation cavity and used for detecting hydrogen leaking into the sealed operation cavity from the valve body along the valve rod. The operating device extends into the sealing operation cavity and is used for operating the valve rod to rotate. By means of the sealed operation cavity arranged in a sealed mode, a small amount of leaked hydrogen can be sealed in a concentrated mode, the hydrogen is prevented from directly entering air, after the hydrogen is concentrated, a hydrogen sensor can conveniently and accurately detect hydrogen leakage, and therefore more time is won for users to deal with the hydrogen leakage problem.

The hydrogen valve double-channel sealing structure based on the temperature sensor comprises a gas cylinder, a bottle opening of the gas cylinder is sealed through a valve body, the temperature sensor is detachably installed at the end, located in the gas cylinder, of the valve body, and the temperature sensor and the valve body are sealed through a double-channel sealing assembly. The double-sealing assembly comprises a first sealing ring, a first check ring, a second sealing ring and a second check ring, the temperature sensor is arranged in the valve body in a sliding and sleeved mode to form a first sealing cavity and a second sealing cavity, and the first sealing cavity and the second sealing cavity are located in the middle and the rear end of the temperature sensor respectively. The utility model belongs to the technical field of valves, the service life of the sealing structure is more than or equal to 15 years by additionally arranging the two sealing assemblies in the valve body, the contradiction between the service life of a rubber sealing material environment and the longest service life of a vehicle-mounted hydrogen cylinder is solved, and the sealing structure has a wide market prospect.

The invention relates to the technical field of sealing structures, and discloses a sealing structure for a high-pressure hydrogen valve, which comprises a middle valve body and side valve bodies respectively arranged at two ends of the middle valve body, a sealing structure is arranged at one end, close to the middle valve body, in each side valve body, and a ball sealing piece is arranged between the two sealing structures. A valve rod is installed on the top of the ball sealing piece. According to the invention, through the arrangement of the two spherical sealing elements, during use, the valve rod can be controlled to move upwards firstly through the first rotary driving device and the second rotary driving device, and the valve rod drives the spherical sealing elements to move inwards under the action of the connecting rod, so that the spherical sealing elements can be temporarily separated from the sealing structure; compared with the prior art, the device has the advantages that the friction process between the ball sealing element and the sealing structure in the movement process is effectively reduced, and the service life is prolonged.

The application discloses a physical heat storage type solid-state hydrogen storage device, which comprises a hydrogen storage cavity and a circulating cavity, a high-thermal-conductivity sealing shell and a heating structure are arranged in the hydrogen storage cavity, a hydrogen storage alloy is arranged in the high-thermal-conductivity sealing shell, a hydrogen pipeline is connected to the front end of the hydrogen storage alloy, and a hydrogen valve is arranged on the hydrogen pipeline. In the hydrogen filling stage, the hydrogen storage alloy is forced to conduct convection cooling by using external air, and the hydrogen storage capacity of the hydrogen storage alloy is greatly improved. In the hydrogen releasing stage, the hydrogen storage alloy is heated by using a phase change heat storage module with constant temperature heat release characteristics, so that the hydrogen is smoothly released, the safety hidden danger of the electric heating mode is eliminated, and the safety and the storage ratio parameters of the solid-state hydrogen storage device are greatly improved. The radiation-proof plate with the gas switch function and the circulating pump are arranged, a large range of heating power can be adjusted, the hydrogen releasing rate can be accurately controlled, the operation is simple and fast, and the applicability of the solid-state hydrogen storage device is improved.

A work machine (100) has a fuel cell stack (22), a hydrogen tank (21), a hydrogen valve (24), a body (11), and a controller (30). The fuel cell stack (22) generates electricity by causing oxygen and hydrogen to react. The hydrogen tank (21) supplies hydrogen to the fuel cell stack (22). The hydrogen valve (24) opens and closes a hydrogen flow path from the hydrogen tank (21) to the fuel cell stack (22). The body (11) supports each of the fuel cell stack (22) and the hydrogen tank (21). The controller (30) controls the opening and closing of the hydrogen valve (24) on the basis of the inclination angle of the body (11).

Disclosed herein is an apparatus for testing liquefied hydrogen valve that can configure the test valve to environmental conditions of a temperature below 20K by using only low-cost helium gas without using liquefied hydrogen or liquid helium as the test fluid. This helps companies developing liquefied hydrogen valves to safely and conveniently perform valve leakage and performance tests. In accordance with the present invention, the apparatus for testing liquefied hydrogen valve includes a test vessel in which a valve body of a test valve is inserted into a vacuum-exhausted inside and sealed with a vessel cover so that an operating part of the test valve protrudes to an outside; an inlet pipe, one end of which is connected to an inlet port of the valve body; an outlet pipe, one end of which is connected to an outlet port of the valve body; a helium tank connected to the other end of the inlet pipe to supply helium gas to the inlet port of the valve body; a cryogenic refrigerator in which a cold head part that cools to a temperature below 20K is inserted into the test vessel, and a gas compression part that suctions, compresses and discharges a refrigerant gas is sealed so that it protrudes out of the vessel cover; a heat conductor, one end of which is coupled to the cold head part of the cryogenic refrigerator and the other end of which is coupled to the valve body of the test valve, and which cools the valve body of the test valve to a temperature below 20K; and a pressure sensor and a flow sensor installed on the inlet pipe and the outlet pipe to measure pressure and flow rate, respectively.

This invention relates to the field of energy-saving combustion technology for furnaces and kilns in the metallurgical industry, specifically to a combined hydrogen-mixed low-carbon combustion device and its control method. The invention mainly includes a hydrogen valve assembly, a gas valve assembly, an air valve assembly, a burner, an igniter, and a baffle plate. The hydrogen valve assembly includes a hydrogen regulating valve and a hydrogen flow meter; the gas valve assembly includes a gas regulating valve, a gas flow meter, and an online gas composition analyzer, wherein the online gas composition analyzer is installed on the gas pipeline; the air valve assembly includes an air regulating valve and an air flow meter. This invention achieves hydrogen-mixed combustion by mixing hydrogen into the existing heating furnace combustion device during fuel combustion. Through the coordination between the various valve assemblies, the flow control valve controls the intake air volume, and the temperature monitoring device monitors the intake air temperature, achieving the effects of reducing pollutant emissions and increasing energy utilization.

The presently disclosed invention relates to a hydrogen valve having a valve housing with a fluid inlet and a fluid outlet. The hydrogen valve includes a valve main body which is configured to be transferable between an open position, in which a volumetric flow connection is established between the fluid inlet and the fluid outlet, and a closed position, in which the valve main body is arranged in a main sealing seat fixed to the housing and the volumetric flow connection between the fluid inlet and the fluid outlet is closed. Also included is a pilot control valve device having a pilot member which is transferable by way of an actuator between an open position in which a throttle bore is exposed through the valve main body and connects the fluid inlet and the fluid outlet to each other and a closed position, in which the pilot member rests in a pilot control valve seat arranged on the valve main body and closes the throttle bore.

The hydrogen valve convenient to detect comprises a ball valve body, a connecting structure is arranged on the ball valve body, and a detecting assembly is clamped in the connecting structure; the detection assembly comprises an adapter, one end of the adapter is fixedly connected with a connecting frame, the end, close to the connecting frame, of the adapter is slidably connected with an inner pipe, a receding opening is formed in the inner pipe, and a baffle ring is slidably connected into the receding opening. According to the gas injection detection device, the connecting structure is arranged to be matched with the detection assembly, the detection assembly can be matched to efficiently conduct gas injection detection on the ball valve body in the detection link only by making small transformation on the ball valve body in the prior art, tedious mounting and dismounting work and sealing work are not needed, the detection efficiency of the ball valve body is greatly improved, and the detection efficiency of the ball valve body is greatly improved. And meanwhile, the production cost of the ball valve main body is not increased too much, and the use of the ball valve main body on a subsequent pipeline is not influenced.