102results about How to "Stable output pressure" patented technology

The invention discloses a proportional electromagnetic valve driving method and system based on PWM. The method comprises the following steps: presetting the corresponding relation of duty cycles and frequency values, wherein the distribution rule of the frequency values in the corresponding relation is that the frequency value corresponding to a middle duty cycle is larger than the frequency values corresponding to the duty cycles on the two sides; according to the corresponding relation, determining the frequency value corresponding to a target duty cycle; according to the target duty cycle and the frequency value corresponding to the target duty cycle, generating a PWM driving signal, and driving a proportional electromagnetic valve by using the PWM driving signal. The method can enable the electromagnetic valve to output stable secondary pressure, the power loss of the electromagnetic valve is lower, and the slight flutter of the valve element of the electromagnetic valve is retained, so that the valve element is prevented from being clamped.

The invention discloses a zero gas generator comprising an air compressor, an air-water separator, a molecular sieve, a pressure control valve and a filter group which are connected in sequence, wherein a pipeline arranged between the molecular sieve and the pressure control valve is connected with an air storage tank. Through additionally providing the molecular sieve, the zero gas generator can further filter out and remove water in air so that the water removal is more thorough; the air storage tank is added to adjust the pressure so that the output pressure is more stable. The zero gas generator has relatively simple entire structure, stable and reliable performance, high filtering and removing efficiency and low noise.

The invention discloses a hot-press device. The hot-press device comprises a hot-press head pair, a hot-press head pressure control system and a hot-press head temperature control system, wherein the hot-press head pair comprises an upper hot-press head and a lower hot-press head; the hot-press head pressure control system is connected with a power assembly of the lower hot-press head by an air pipe and is used for providing gas with stable pressure to the power assembly by closed loop feedback pressure control, and heating assemblies are driven to do reciprocating linear movement by the power assembly under the action of the pressure gas; and the hot-press head temperature control system is electrically connected with a first heating assembly of the upper hot-press head and a second heating assembly of the lower hot-press head, and is used for stabilizing the temperatures of the heating assemblies by closed loop feedback temperature control. According to the hot-press device, the power assemblies of the hot-press heads are connected into a control air path in parallel, and the same air pressure is provided by the pressure control system, so that the pressure output from a plurality of hot-press heads can be consistent. The temperatures of the multiple hot-press heads are stabilized by the closed loop feedback temperature control, so that the problems of an existing hot-press head that the pressure is inconvenient to adjust, and the stability and the consistency of the pressure and the temperature are difficult to ensure can be solved.

The invention discloses an integrated pressure reducing valve. The integrated pressure reducing valve comprises a valve body, an inlet and an outlet located outside the valve body, and a pressure reducing system located inside the valve body, wherein the inlet is in fluid communication with a gas source outlet of a hydrogen fuel cell electric vehicle, and the outlet is in fluid communication witha downstream electric reactor of the hydrogen fuel cell electric vehicle; and a pressure reducing system comprises a first-stage pressure reducing valve and a second-stage pressure reducing valve which are located between the inlet and the outlet and are in fluid sequence communication, and the first-stage axis of the first-stage pressure reducing valve and the second-stage axis of the second-stage pressure reducing valve are vertically arranged. According to the integrated pressure reducing valve, the two-stage pressure reducing system is arranged, so that the stability of outlet pressure isguaranteed, meanwhile, the two stages of the pressure reducing valves are vertically arranged, so that the size of main body structure is optimized while the pressure adjustment is further improved, and more compact structure is formed.

The invention discloses a method, a device and a respirator for voltage stabilization of continuous positive pressure ventilation. The method comprises the following steps: receiving a flow rate of a respirable gas in a pressurized flow, which is measured by a flow sensor, according to a preset time interval; ensuring a second derivative of the flow rate of a preset time point; acquiring an average flow rate, air leakage, an inspiration tidal volume and inspiration time; judging whether the average flow rate is greater than the air leakage; if so, determining a gain value to be a product of a value of a quotient of the inspiration tidal volume divided by the inspiration time minus the air leakage and a first coefficient; if not, determining the gain value to be a product of a value of a quotient of the inspiration tidal volume divided by the inspiration time minus the air leakage and a second coefficient, wherein the first coefficient is greater than the second coefficient; determining a respiration vector which is a product of the gain value and the second derivative; and controlling a driving signal of a baseline configuration pressure generator on the basis of the respiration vector and a pressure generator. The method foresees a flow rate variation trend through the respiration vector, controls the flow rate of the current time point, and guarantees stable output pressure of the respirator.

The invention discloses a wave energy and solar energy seawater desalination and salt production apparatus, which comprises an energy capture device, an energy storage voltage stabilization device, areverse osmosis device and a residual energy recovery device, wherein the energy capture device, the energy storage voltage stabilization device, the reverse osmosis device and the residual energy recovery device are sequentially connected through pipelines, the energy storage voltage stabilization device comprises M stages of energy storage voltage stabilization pipelines sequentially arranged side by side, the inlet ends of the two adjacent stages of the energy storage voltage stabilization pipelines are connected by connecting pipes, various connecting pipes form a N-stage connecting pipe,each stage of the connecting pipe is provided with a sequence valve, the outlet ends of the M stages of the energy storage voltage stabilization pipelines are collected to a voltage stabilization water outlet total pipe, pressure stabilized seawater is input into the reverse osmosis device through the voltage stabilization water outlet total pipe, each stage of the energy storage voltage stabilization pipeline is provided with an energy storage device and a pressure reducing valve, and the set output pressures of the M pressure reducing valves of the M stages of the energy storage voltage stabilization pipelines are sequentially increased. Compared with the apparatus in the prior art, the apparatus of the present invention has advantages of stable water production and energy saving.

The invention discloses a blood pumping device, which comprises a blood pump mechanism; the blood pump mechanism comprises a shell in which a cavity is formed; an air inlet communicated with the cavity is formed in the shell; an elastic liner with an air intake is arranged in the cavity; the air intake of the liner is fixedly arranged at the air inlet of the shell; the other side, which is opposite to the air inlet, of the shell is provided with a blood inlet pipe and a blood outlet pipe side by side, wherein the blood inlet pipe and the blood outlet pipe are communicated with the cavity in the shell; an inlet check valve capable of enabling blood flowing into the cavity in the shell unidirectionally is arranged between the blood inlet pipe and the cavity in the shell; an outlet check valve capable of enabling blood flowing out from the cavity in the shell is arranged between the blood inlet pipe and the cavity in the shell; the side, with the air intake, of the shell is provided with an air pump for filling in or pumping gas from the liner. The blood pumping device has the advantages that mechanical injury on blood cells is small; the maximum outlet pressure and blood volume can be independently adjusted; blood can be properly warmed to reduce coagulation, and cancer cells in the blood can be killed.

The invention provides a glass-tempering cooling air grid. The glass-tempering cooling air grid comprises a frame which is provided with a roller way conveying device for conveying high-temperature glass along a horizontal direction, the upper side and the lower side of the roller way conveying device are provided with an upper air grid component and a lower air grid component respectively; the frame is also provided with an air compressor which is communicated with a balancing tank through a gas-water separator, wherein the balancing tank is communicated with the upper air grid component and the lower air grid component through a plurality of branches, and each branch is provided with a pressure-reducing valve and a pressure gauge. The glass-tempering cooling air grid is mainly used for a cooling air grid section in glass tempering equipment, and achieves the purpose of quickly cooling the tempered high-temperature glass, and ensures that the glass meets specified requirements of granularity and smoothness for tempering.

The invention provides a sand conveying and mixed discharging system and a control method. The sand conveying and mixed discharging system comprises a mixed discharging device, the structure of the mixed discharging device is characterized in that a feeding hopper is arranged at the top of a tank body, a main shaft is vertically arranged in the tank body by penetrating the feeding hopper, the mainshaft is connected with a driving device driving the main shaft to rotate, a booster impeller is arranged below the feeding hopper, the booster impeller is fixedly connected with the main shaft and rotates along with the main shaft, a top opening is formed in the middle of the top of the booster impeller, the bottom of the feeding hopper communicates with the top opening, a side wall opening is formed in the side wall of the booster impeller, the top opening communicates with the side wall opening, a bearing seat is arranged at the bottom of the main shaft, and a sealing device is arranged between the main shaft and the end part of the bearing seat. According to the system, through the arrangement of the structure of the booster impeller, the centrifugal force can be utilized to maintainthe pressure in the tank body, so that an additional pressurized feed tank is not arranged, the equipment structure is greatly simplified, the installation space of the equipment is reduced, and the equipment volume is reduced.

Provided is an air drive hydraulic power system used on a corner combination machine. The power system comprises an air source, an air source switching valve, an air source treatment device A, two two-position five-way solenoid valves, two two-position three-way solenoid valves, an air-hydraulic converter and an air-hydraulic pressure cylinder, wherein the air inlet and the air outlet of the air source switching valve are communicated with the air inlet of the air source and the air inlet of the air source treatment device A respectively, the air inlets of the four solenoid valves are all communicated with the air outlet of the air source treatment device A, the forward-movement air outlet and the backward-movement air outlet of one two-position five-way solenoid valve are communicated with the air inlet of the air-hydraulic converter and the air inlet of a positioning cylinder respectively, and the forward-movement air outlet and the backward-movement air outlet of the other two-position five-way solenoid valve are communicated with the forward air inlet and the backward air inlet of the air-hydraulic pressure cylinder respectively; the oil inlet of an air-hydraulic pressurizer is communicated with the oil outlet of the air-hydraulic converter, and the oil outlet of the air-hydraulic pressurizer is communicated with the oil inlet of a corner combination cylinder in parallel; the air outlets of the two two-position five-way solenoid valves are communicated with the air inlet of the corner combination cylinder and the air inlet of a pressing cylinder respectively. The power system has the advantages of being high in working efficiency, capable of saving energy, free of noise and pollution, stable in output pressure and the like.

The invention relates to a liquid-gas state converter of carbon dioxide / nitrogen and a conversion system. The converter comprises a casing. Liquid inlet pipes and gas exhaust pipes are arranged; a heat exchange device is arranged in the casing; a heater is arranged below the heat exchange device; a heating pipe of the heater is located below the heat exchange device; the conversion system comprises a plurality of converters; the liquid inlet pipes of the plurality of the converters are connected with one conveying pipe; the gas exhaust pipes of the plurality of the converters are connected with a conveying pipe; each converter is provided with a monitoring cabinet; and the monitoring cabinets can monitor the working conditions and the working parameters of the converters and automatically control and regulate the operation of the converters according to the detected working parameters. According to the converter and the conversion system, the heat energy loss is small, the heat efficiency is high, and the energy-saving effect is good; and the conversion system can realize automatic segmentation control and regulation according to the operation state of the system and can also realize automatic control of all parameters of output gaseous carbon dioxide / nitrogen. The converter and the conversion system are mainly applicable to fire prevention and extinguishing under mines.

The invention discloses a hydraulically-driven wave energy power generation device. The hydraulically-driven wave energy power generation device comprises a primary energy capture mechanism, a variable-displacement computer-numerical-control hydraulic cylinder connected behind the primary energy capture mechanism, a hydraulic transmission system driven by the variable-displacement computer-numerical-control hydraulic cylinder, and a power generator connected behind the hydraulic transmission system, wherein the areas of N groups of hydraulic sub-cylinders of the variable-displacement computer-numerical-control hydraulic cylinder are different from each other and the area ratio S1: S2: S3: ... : SN is equal to 1: 2: 4: ... : 2<N-1>; a first input end and a second input end of the hydraulic transmission system are connected with a rectifying valve group composed of four check valves; a positive hydraulic output end of the rectifying valve group is connected with a high-pressure energy accumulator and then is connected with a hydraulic input end of a hydraulic motor; a hydraulic output end of the hydraulic motor is connected with a low-pressure energy accumulator and then is connected with a negative hydraulic backflow end of the rectifying valve group; and the hydraulic motor unidirectionally rotates under the action of hydraulic oil, so as to drive the power generator to generate power. The hydraulically-driven wave energy power generation device has the following advantages: hydraulic energy output by the hydraulic cylinder is stable, energy transfer efficiency is high, and wave energy power generation efficiency can be increased.

The invention discloses a hydraulic source load self-adaptive system and a self-adaptive control method. The hydraulic source load self-adaptive system comprises a controller, two pressure sensors, adirect-current synchronous motor, a check valve, an energy accumulator, an electro-hydraulic servo valve, an overflow valve, an electrically controlled reversing valve and an adjustable throttle valve. The pressure sensors are arranged at the two ends of the adjustable throttle valve. The input end of the controller is connected with the two pressure sensors. The output end of the controller is connected with the electro-hydraulic servo valve and the direct-current synchronous motor. The inlet end of the adjustable throttle valve is arranged between a gear pump outlet and the check valve. Theoutlet end of the adjustable throttle valve is arranged on the high-pressure side of the overflow valve. The low-pressure side of the overflow valve communicates with an oil tank through an oil way. The energy accumulator is arranged between the electrically controlled reversing valve and the check valve. The input end of the electro-hydraulic servo valve is connected with the electrically controlled reversing valve. The output end of the electro-hydraulic servo valve is connected with a load hydraulic cylinder. According to the hydraulic source load self-adaptive system and the self-adaptivecontrol method, output characteristics of a hydraulic system are matched with the load magnitude through pressure difference signal feedback, and power consumed by a hydraulic source can be controlledeffectively. The hydraulic source load self-adaptive system can be applied to a deep sea hydraulic source, and energy-saving control of the hydraulic source load self-adaptive system is achieved.

The invention relates to an axial flow pressure regulator. The axial flow pressure regulator comprises a valve body consisting of an upper shell with an air inlet and a lower shell with an air outlet, and a controller connected with the air inlet and the air outlet; an air accommodating cavity is formed in the valve body, and a balance membrane for separating the air accommodating cavity into an upper cavity and a lower cavity is arranged in the valve body; the upper cavity is communicated with the air outlet; the lower cavity is communicated with the controller; a sleeve is arranged in the valve body; the bottom of the sleeve is provided with a connected valve clack; the sleeve is connected with the valve body through a spring; the controller consists of a director for controlling air pressure and a pressure stabilizer matched with the director. The axial flow pressure regulator has the characteristics of simple structure, stable output pressure, good pressure control and regulation performance and the like.

The invention discloses a capacity electricity loaded hydraulic pump testing device which comprises a tested hydraulic pump, a hydraulic motor for loading and a computer measurement and control device, wherein the tested hydraulic pump is directly connected with the hydraulic motor for loading and is connected to a switching rectification device of an alternating current network through a frequency conversion motor for dragging the tested pump and an inversion device of the frequency conversion motor for dragging the tested pump in sequence; the hydraulic motor for loading is connected to the switching rectification device of the alternating current network through an alternating current dynamometer and an inversion device of the alternating current dynamometer in sequence; the computer measurement and control device is connected with the tested hydraulic pump, the hydraulic motor for loading, the inversion device of the frequency conversion motor for dragging the tested pump and the inversion device of the alternating current dynamometer respectively. The capacity electricity loaded hydraulic pump testing device has an energy-saving effect, and can realize loading of the tested pump. The device is simple in structure, flexible in configuration and convenient to operate, and the rotating speed and pressure of the tested hydraulic pump are independently controlled.

The invention discloses a gas clamping valve, which is characterized in that: a valve body is provided with a valve cavity with a cavity structure, a soft diaphragm is arranged in the valve cavity, the diaphragm is supported by a diaphragm connecting rod mechanism and sealed and covered by a valve cover, the diaphragm connecting rod mechanism consists of a diaphragm connecting rod fixedly arranged in the center of the diaphragm and an adjusting rod for adjusting the diaphragm connecting rod, and adjusting rod sealant particles for sealing a nozzle in the valve cavity are arranged on the adjusting rod; a valve core of an air outlet adjusting device is a cone valve core; a safety device is an explosion-proof device and consists of an explosion-proof ejection rod, an explosion-proof ejection rod spring and explosion-proof rod sealant particles; and the matched surface of the explosion-proof rod sealant particles and the valve body is circular. The clamping valve structure of the invention has the advantages of excellent low-pressure performance, high gas utilization rate, stable output pressure, good leakage-proof effect in safe pressure and high explosion-proof sensitivity over safe pressure.

The invention relates to an emulsion pump station control system, in particular to an unmanned intelligent control system for a mining emulsion pump station. The system comprises an automatic pressurecontrol system, an automatic emulsion proportioning system, a remote data transmission system and a data monitoring and fault diagnosis system which are electrically connected, wherein the automaticpressure control system compares pressure set by the system with the value of a pressure sensor; the automatic emulsion proportioning system is used for controlling the sizes of a clear water solenoidvalve and an emulsified oil solenoid valve according to the concentration of emulsion; and the remote data transmission system has a data transmission function. Through the system, a series of problems such as large manual input, low emulsion proportioning precision, unstable pump station pressure output, high production cost and the like are solved; and meanwhile, the system has protection and monitoring functions, is stable and reliable, and has important significance for realizing intelligent mine and coal mine safety production.

The invention discloses a hot-press device. The hot-press device comprises a hot-press head pair, a hot-press head pressure control system and a hot-press head temperature control system, wherein the hot-press head pair comprises an upper hot-press head and a lower hot-press head; the hot-press head pressure control system is connected with a power assembly of the lower hot-press head by an air pipe and is used for providing gas with stable pressure to the power assembly by closed loop feedback pressure control, and heating assemblies are driven to do reciprocating linear movement by the power assembly under the action of the pressure gas; and the hot-press head temperature control system is electrically connected with a first heating assembly of the upper hot-press head and a second heating assembly of the lower hot-press head, and is used for stabilizing the temperatures of the heating assemblies by closed loop feedback temperature control. According to the hot-press device, the power assemblies of the hot-press heads are connected into a control air path in parallel, and the same air pressure is provided by the pressure control system, so that the pressure output from a plurality of hot-press heads can be consistent. The temperatures of the multiple hot-press heads are stabilized by the closed loop feedback temperature control, so that the problems of an existing hot-press head that the pressure is inconvenient to adjust, and the stability and the consistency of the pressure and the temperature are difficult to ensure can be solved.

The invention discloses a water-based proportional decompression overflow valve. The water-based proportional decompression overflow valve comprises a valve body, a valve sleeve, a decompression valve element, an overflow valve element, an elastic piece and an electric-mechanical conversion element, wherein the valve body is provided with a liquid supply channel, a decompression channel and an unloading channel, the valve sleeve is installed in the valve body and provided with a liquid supply cavity, a decompression cavity and an unloading cavity, the decompression valve element is slidably connected to the valve body, the unloading cavity is divided into a first cavity and a second cavity, the first cavity communicates with the decompression cavity, the second cavity communicates with the unloading channel, the overflow valve element is located in the first cavity and connected to the decompression valve element, the decompression valve element can drive the overflow valve element to move so that an overflow valve opening can be conveniently opened, the elastic piece presses the overflow valve element in the direction of closing the overflow valve opening, and the electric-mechanical conversion element is in driving connection with the decompression valve element. The water-based proportional decompression overflow valve has the advantages of being low in machining and assembling difficulty and stable in output pressure of an decompression valve opening.

The invention discloses a pulse width modulation based pneumatic proportion pressure regulating valve. A closed-loop control system is composed of a pilot pressure regulating valve, high-speed switching valves, a pressure sensor, a control circuit with a single-chip microcomputer as a core and a display circuit, the system outputs a pulse width modulation (PWM) signal through software programmingto control the two pneumatic high-speed switching valves, and the pressure of a pilot cavity of the pneumatic pressure regulating valve is controlled so as to achieve the aim of carrying out proportion control over the pressure of an outlet of the pressure regulating valve. According to the pneumatic proportion pressure regulating valve, continuous and adjustable pressure can be generated, stability of output pressure can be guaranteed, and good control performance and practicality are achieved.

The invention provides a hydrate evaluation experiment system and method. The hydrate evaluation experiment system comprises a first gas cylinder, a second gas cylinder, a flow control device, a flowcontroller, a magnetic stirring container, a chemical reagent injection device, a closed loop and the like. The first gas cylinder is used for storing CH4 or natural gas mixed gas; a gas outlet of thefirst gas cylinder is connected with the magnetic stirring container through the flow controller; the second gas cylinder is used for storing CO2 gas; a gas outlet of the second gas cylinder is connected with the magnetic stirring container through the flow control device; a chemical reagent injection port is formed in the magnetic stirring container and is connected with an outlet of the chemical reagent injection device; and the closed loop is respectively connected with the first gas cylinder, the second gas cylinder and the chemical reagent injection device through a twentieth valve. According to the method, hydrate formation can be simulated, meanwhile, the influence on hydrate formation and decomposition rules is analyzed, and further detailed analysis and research can be carried out conveniently to guide production.

The invention relates to a temperature reduction and pressure reduction stable heat supply device comprising a controller, a conveying pipe, a steam pipe and a condensation device. A temperature reduction device, an adjustable pressure reduction device, a pressure stabilizing device, a temperature and pressure sensor and a safety valve are sequentially arranged on the conveying pipe from left to right. The outlet end of the steam pipe is inserted in the left end of the conveying pipe. The condensation device communicates with the outlet end of the safety valve. The temperature and pressure sensor is electrically connected with the controller. According to the temperature reduction and pressure reduction stable heat supply device, temperature is reduced through the temperature reduction device, pressure is reduced through the adjustable pressure reduction device, pressure is stabilized through the pressure stabilizing device, the temperature reduction and pressure reduction effect on high-temperature and high-pressure steam is good, and the steam output pressure is stable.

The invention relates to an electrohydraulic inverse proportion pressure reducing valve and belongs to the field of hydraulic control. The proportion pressure reducing valve comprises a valve body, avalve element, a cylinder plug, a first resetting spring, a second resetting spring, a proportion electromagnet and a baffle. A stepped valve cavity is adopted, when the electromagnet does not work, the work pressure output by the pressure reducing valve is maximum, along with increasing of current, the electromagnetic pushing force output by the electromagnet increases, the work pressure of the pressure reducing valve is gradually reduced, the hydraulic force in a work cavity of the valve element is balanced with the spring force and the electromagnetic force, and pressure adjusting of a hydraulic oil way is achieved. The structure of the pressure reducing valve is greatly simplified, and the production cost is reduced. The inverse proportion pressure reducing valve can improve the stability and the control precision of work of the system.

The invention relates to the technical field of electric propulsion, in particular to an electric propulsion system storage and supply unit and a manufacturing method thereof, and the electric propulsion system storage and supply unit comprises a storage module, a force bearing module, a pressure regulating module, a flow control module and an electric connection module, wherein the storage moduleis disposed in the force bearing module, a cover flange at the lower end of the storage module is fixed at the bottom of the force bearing module through a bolt, the upper end of the force bearing module radially restrains a cover joint at the upper end of the storage module; the pressure regulating module is connected with the force bearing module through a connecting port, and the flow controlmodule is connected with the force bearing module through the connecting port; the electric connection module is connected with the force bearing module through an electric connector and electricallyconnected with the pressure regulating module and the flow control module through wires. The electric propulsion system storage and supply unit is simple and compact in structure, light in weight andhigh in duty efficiency, and the propellant regulation and control mode and capacity of the electric propulsion system storage and supply unit can meet the increasingly complex and diversified attitude and orbit control requirements of spacecrafts in the future.

The invention discloses an internal booster pump of a low-temperature natural gas cylinder for a vehicle, and relates to the technical field of natural gas cylinders. The internal booster pump comprises a hydraulic oil cylinder, a cooling liquid cavity, a balance cavity, a compression cylinder, a piston rod and a filter. The internal booster pump can replace an external gasifier and a booster of aconventional vehicle-mounted LNG gas cylinder. A vehicle-mounted hydraulic system is used for supplying power to drive the internal booster pump to work, the booster pump is provided with a gasification device to exhaust LNG in the low-temperature gas cylinder and to gasify and pressurize the LNG to 34.5 Mpa, and the high-pressure and high-density form of natural gas is kept stable and reliable.

The invention discloses a constant pressure reducing valve which comprises a valve body. The first end is provided with a primary low-pressure cavity and a primary transition cavity. The second end isprovided with a secondary low-pressure cavity and a secondary transition cavity. A gas inlet and a gas outlet are formed in the side wall of the valve body. The gas inlet, the primary transition cavity, the primary low-pressure cavity, the secondary transition cavity, the secondary low-pressure cavity and the gas outlet sequentially communicate. A primary pressure adjusting assembly is arranged on the communicating portion of the primary transition cavity and the primary low-pressure cavity. A secondary pressure adjusting assembly is arranged on the communicating portion of the secondary transition cavity and the secondary low-pressure cavity. A primary valve cover is connected with the first end. A primary pressure sensitive element is arranged between the primary valve cover and the first end. A primary valve cover elastic element is arranged in the primary valve cover cavity. A secondary valve cover is connected with the first end. A secondary pressure sensitive element is arrangedbetween the secondary valve cover and the first end. A secondary valve cover elastic element is arranged in the secondary valve cover cavity. A handle is fixedly connected with one end, extending outof the secondary valve cover, of a secondary ejection screw. The constant pressure reducing valve outputs pressure and flow stably and is convenient to be closed and opened.

The invention relates to a controller, in particular to a novel controller for a gas pressure regulator, which comprises a gas inlet (1), a shell (2), a pressure stabilizer (A) and a director (B), wherein the pressure stabilizer (A) and the director (B) are arranged in the shell (2); the pressure stabilizer (A) comprises a pressure stabilizer valve port gasket (A5) and a pressure stabilizer valve port (A6); the director (B) comprises a third gas guide hole (B11), a director valve port (B4), a director valve port gasket (B5) and a director membrane (B7); the pressure stabilizer (A) is also provided with a first gas guide hole (A2) and a first channel (A11); one end of the first gas guide hole (A2) is communicated with the gas inlet (1); and the other end of the first gas guide hole (A2) is communicated with the pressure stabilizer valve port gasket (A5) through the first channel (A11). By adopting the technical scheme, the novel controller is stable in control output pressure and is better in control pressure regulating property.

The invention discloses a pulse width modulation gas-based depressurizing method and device. The pulse width modulation gas-based depressurizing device includes a high-pressure gas pipe, an electric control air valve, a gas storage tank, a low-pressure gas pipe, a pressure sensor and an electric control device; the top of the gas storage tank is provided with the pressure sensor; the pressure sensor transmits pressure sensing signals to the electric control device; the electric control device transmits valve-opening signals to the electric control air valve; the high-pressure gas pipe is connected with the gas storage tank through the electric control air valve; and the gas storage tank is also connected with the low-pressure gas pipe. According to the pulse width modulation gas-based depressurizing method and device of the invention, a digital electric control technology is adopted to measure output pressure; and PWM is adopted to control the on-off of the high-pressure gas valve. The pulse width modulation gas-based depressurizing method and device have the advantages of high sensitivity, wide adaptation range, flexible pressure setting and small fluctuation range. With the method and device adopted, a fluctuation range is within than 3%.