1144 results about "Pilot valve" patented technology

The invention discloses a pilot valve control method and device based on data detection and automatic pressure regulation, and relates to the technical field of pilot valves. The method comprises the steps that the medium pressure of a piston containing cavity is obtained in real time through a pressure sensor, and the displacement amount of a piston shaft is obtained in real time through a displacement sensor; querying a pre-stored pressure-displacement correlation curve based on the medium pressure to determine a target displacement amount; generating an adjusting signal according to the deviation data of the real-time displacement and the target displacement; and the pressure regulating component is controlled to dynamically regulate the pretightening force of the spring to realize pressure closed-loop control. The device comprises a mechanical execution unit, a data detection unit and a control processing unit, all the units work cooperatively, closed-loop control over pressure adjustment is achieved by detecting medium pressure and piston shaft displacement in real time and dynamically adjusting spring pre-tightening force, and the device has the advantages of automatic calibration, manual intervention reduction and control precision improvement.

The invention discloses a pilot-operated type self-driving fluid release valve, and belongs to the field of control valves. Comprising a main valve assembly, a pilot valve assembly and a one-way valve assembly. Valve bodies of the pilot valve assembly and the one-way valve assembly are integrated on a main valve body of the main valve assembly; the main valve assembly comprises a main valve body, a main valve piston, a main valve element and a main valve spring. The pilot valve assembly comprises a pilot valve air control opening, a pilot valve inlet, a pilot valve outlet channel and a pilot valve pressure relief opening. The one-way valve assembly is arranged at an outlet of the main valve and used for blocking medium backflow. Through mechanical configuration reconstruction and system integration innovation, the technical contradiction of the liquid rocket engine high-pressure gas control valve in weight, response speed and reliability is thoroughly solved.

The present invention provides a quick connector for a hydrogen tube bundle vehicle, comprising: a male end, which includes a male gun seat, a gas distribution valve and a pilot valve; a female end, which includes a female gun seat, a gun head sleeve, an outlet valve core and a main valve core, the gun head sleeve is fixedly connected to the female gun seat through a gun body, and the gun body is provided with a gas replacement channel; wherein, in a first state, the pilot valve is closed to make the male end self-sealed, and the outlet valve core and the main valve core are closed to make the female end self-sealed, and in a second state, the gun head sleeve is aligned with the male gun seat and fits together, and the gas replacement channel can be connected to the internal channel of the female end through the main valve core to perform gas replacement, and the outlet valve core can be fit together with the end face of the pilot valve, the pilot valve, the outlet valve core and the main valve core are all opened to connect the internal channels of the male end and the female end, so that the quick connector can be opened under pressure, and the first state and the second state can be switched, so that the pressurized connection and pressurized disconnection of the male end and the female end can be completed.

The invention discloses a pneumatic ash conveying intelligent control method and system based on an intelligent pilot valve, and relates to the technical field of intelligent control. According to the pneumatic ash conveying intelligent control method based on the intelligent pilot valve, when materials to be conveyed are conveyed in an ash conveying pipe, time sequence data are conveyed in real time, the time sequence data are pushed in real time, data analysis is conducted respectively, and a comprehensive conveying index of the ash conveying pipe at each time point and a pushing index of an air conveying pipe at each time point are obtained; performing comprehensive analysis to obtain a valve control index at each time point, and performing analysis to obtain a comprehensive valve control index change rate; according to the method, the comprehensive valve control index change rate and the preset comprehensive valve control index change rate interval are judged and analyzed, and the corresponding control measures are taken based on the judgment and analysis result, so that the change in the conveying process is mastered in real time, the dynamic optimization of the ash conveying process is realized, and the ash conveying efficiency is improved. And therefore, the conveying stability and the overall ash conveying efficiency are improved.

The invention discloses a steam discharge control method based on pilot valve adjustment, and particularly relates to the technical field of steam discharge, which comprises the following steps: determining the actual pressure and expected pressure of a main valve and the set pressure of a pilot valve, and comparing the relationship between the actual pressure of the main valve and the expected pressure of the main valve to obtain the set pressure of the pilot valve. The hysteresis between the actual pressure and the expected pressure of the main valve in the time delay information is determined, a delay transfer function model of the steam system PID controller in the monitoring time period is obtained, a delay factor of the delay transfer function model is obtained, and the response delay of the steam system in the time delay information is determined; the ARMA model is used for modeling the time sequence data of the actual pressure, the change trend of the actual pressure of the main valve in the pressure change information is determined, the potential risk of the steam system is judged, it can be ensured that the system keeps stable operation in various change environments, and excessive adjustment or control failure of the pilot valve is avoided.

The invention discloses a pilot valve for hydraulic adjustment, and relates to the technical field of pilot valves, the pilot valve comprises a main valve sleeve assembly, an electromagnet assembly and a coil assembly which are assembled in sequence, the electromagnet assembly comprises a shell and a driving shaft, the driving shaft is assembled in the shell in a sliding mode, and the main valve sleeve assembly comprises an end cover, a main valve sleeve, a main valve element, a front valve element, a main spring seat and a pilot valve element. The main valve sleeve is fixedly installed in the shell, the end cover is in interference fit with the end, away from the shell, of the main valve sleeve, the main valve element is slidably assembled in the main valve sleeve, the front valve element is slidably assembled in the main valve element, the main spring seat is slidably assembled in the front valve element, and one end of the main spring seat movably penetrates through the front valve element to be in threaded connection with the end cover. A main elastic piece is assembled between the main spring seat and the front valve element, the pilot valve element is assembled between the main valve element and the driving shaft in a sliding mode and located on the moving path of the driving shaft, and a pilot elastic piece is assembled between the pilot valve element and the main valve element. Assembly is easy, machining difficulty is reduced, mass production is facilitated, and cost is reduced.

The invention belongs to the technical field of automobile shock absorber electromagnetic valves, and particularly relates to a hydraulic shock absorber electromagnetic valve for vehicle testing, which controls whether a liquid inlet hole is directly communicated with a main liquid cavity or not through an elastic valve plate, and controls whether the main liquid cavity is communicated with a liquid outlet hole or not through a pressurizing seat. The pressure of oil entering the liquid inlet must overcome the tension of the elastic valve block, the supporting force of the elastic supporting piece can push the elastic valve block and the pressurizing base to move in the direction away from the main valve body, then the oil can flow back to the shock absorber through the liquid outlet hole, and the resistance borne by the oil in the electromagnetic valve is increased. And large damping force is provided for the vibration damper. By arranging the pressurizing cavity, when the electromagnetic coil is powered on, the pilot valve element blocks the overflow hole, oil in the overflow hole applies pressure to the pressurizing base, the oil does not easily push away the pressurizing base and the elastic valve block in the direction away from the main valve body, and oil resistance is further increased. The electromagnetic valve consumes less electric energy, and the vehicle research and development test efficiency is improved.

The invention provides a high-pressure overflow valve with an oil supplementing function, and relates to the technical field of valves. The high-pressure overflow valve with the oil supplementing function comprises an overflow valve shell assembly, an overflow valve element assembly and an elastic force adjusting assembly. An overflow port is arranged outside the main valve body, and a leakage port is arranged on the outer side of the pilot valve body. The valve sleeve is fixed to the tail end in the main valve body, an oil outlet hole communicated with the leakage port is formed in the outer portion of the valve sleeve, an inclined face, an arc-shaped annular groove and an annular face which are integrally formed are arranged on the outer wall of the main valve element, and the support and the pilot valve element are movably arranged in the pilot valve body in the axial direction and elastically supported through a second spring. The oil passing through the overflow port extrudes and moves the main valve element backwards through the arc-shaped ring groove and the ring face on the outer side of the main valve element, the oil in the oil tank flows back into the pipeline system through the overflow port, and the oil overflowing into the oil tank automatically flows back into the pipeline system when the oil pressure in the oil tank is higher than that of the pipeline system.

The invention belongs to the technical field of valves, and discloses a two-way proportional overflow valve which comprises a main valve sleeve, a pilot valve sleeve assembly, a main valve element, an elastic assembly, a pilot valve element and an electromagnetic assembly, a first oil port, a second oil port and an oil discharge port are formed in the main valve sleeve, and a first cavity is formed between the main valve element and the pilot valve sleeve assembly; the main valve element is provided with a first damping channel communicating with the first oil port and the first cavity and a second damping channel communicating with the second oil port and the first cavity, a first plugging piece is arranged in the first damping channel and used for enabling a medium to flow to the first cavity from the first oil port in a one-way mode, and a second plugging piece is arranged in the second damping channel and used for enabling the medium to flow to the second cavity from the second oil port in a one-way mode. And the second plugging piece is used for enabling the medium to unidirectionally flow to the first cavity from the second oil port. The two-way proportional overflow valve can replace the integrated state of two groups of overflow valves, space and cost are saved, reverse cut-off of the other damping channel can be achieved on the basis that overflow is completed through one damping channel, and normal work of the overflow valve is guaranteed.

The application relates to the technical field of liquid control check valves, and discloses a plug-in type large-flow liquid control check valve structure with an adjustable pilot ratio, which comprises a pilot valve block and a main valve core, the pilot valve block is provided with a protective cap, one end of the protective cap is provided with a first base, a limiting rod is movably connected in the first base, a guide plunger is in contact connection with one end of the limiting rod, a top rod is in contact connection with the bottom of one end of a rotating lever, a steel ball is in contact connection with the bottom of the top rod, the steel ball is movably connected in the second base, the second base is provided with a third return spring, the pilot valve block and the main valve core are composed of two-stage structures, the pilot valve block adopts a unique mechanical structure, the control pilot ratio of the liquid control check valve is changed by adjusting the limiting rod, the main valve core adopts a two-way plug-in valve, the characteristics of high flow capacity of the two-way plug-in valve are fully utilized, the problem of large flow is solved, and the designed flow of the application can reach 5000 L / min.

The invention discloses a system and method for testing flow, displacement and hydraulic power of a main valve element. The system comprises two displacement sensors, a tested balance valve and a hydraulic testing assembly. A main valve core and a pilot valve core of the tested balance valve are coaxially and oppositely arranged; the two displacement sensors are coaxially fixed with the main valve core and the control piston respectively; the hydraulic test assembly detects the pressure of an oil return port A, a load oil port B, a feedback spring cavity pressure measuring port Pc and a pilot oil inlet X through pressure sensors; the load pressure, the pilot pressure and the oil return back pressure are controlled through a main load oil way, a pilot control oil way and an oil return back pressure oil way respectively, and meanwhile the flow of the oil return is measured through a flow meter. According to the invention, the flow, displacement and hydraulic force of the main valve core under different working conditions can be synchronously and dynamically measured.

A pure electric mining dump truck hydraulic system comprises a hydraulic steering system and a hydraulic lifting system, and the hydraulic steering system comprises a steering plunger pump, an energy accumulator, a multi-way valve assembly, a steering valve, a two-way unloading valve, a steering cylinder and an electromagnetic reversing valve; the lifting system comprises a gear pump, an overflow valve, a lifting valve, an oil suction filter, a lifting control handle, a pilot valve block, a bounce valve, a lifting cylinder and a lifting hydraulic oil tank. And the steering plunger pump and the lifting plunger pump are driven by a double-shaft extension motor. A single motor can drive the two hydraulic systems to operate stably, space is saved, meanwhile, jamming and preparation time of the two systems during operation and switching are shortened, energy is saved, and efficiency is improved.

The invention discloses a breathing synchronization pulse oxygen supply device and method, and relates to the technical field of medical instruments, the breathing synchronization pulse oxygen supply device comprises a valve body assembly, an oxygen saving assembly and a gear adjusting assembly, the valve body assembly is composed of an upper cover, a valve body, a valve body middle plate, a valve body lower plate and a pressing plate; the oxygen saving assembly is composed of a pilot diaphragm, a pilot spring, a main valve rod, a main valve rod spring, a main valve piston, a pilot valve rod, a pilot valve rod spring, a pressure supplementing needle valve, a pressure relief needle valve and a plurality of sealing rings. The gear adjusting assembly is composed of an adjusting ring and a gear plate. When the breathing synchronization pulse oxygen supply device works in the pulse oxygen supply mode, pulse type oxygen supply is achieved, and when the breathing synchronization pulse oxygen supply device works in the continuous oxygen supply mode, continuous oxygen supply is achieved. The structure that the metal piston is matched with the sealing ring is adopted, aging is not prone to occurring, the single-connector mode is adopted, cost is saved, and compatibility is improved; the oxygen outlet duration during inspiration is adjusted by adjusting the needle valve, operation is easy, control is easy, and the uniformity and stability of the oxygen outlet duration are improved.

The utility model relates to the technical field of all-steel-ball type electromagnetic multi-way valves of harvesters, and discloses an all-steel-ball type electromagnetic multi-way valve of a harvester, which comprises a composite hydraulic control plunger, the composite hydraulic control plunger comprises a second steel needle, a sealing element and a second guide column, the sealing element comprises a third steel ball and a second ball seat, and the second steel needle is connected with the second steel needle. A second ball seat is connected into the second guide column, one end of the second ball seat is connected with a third steel ball, one end of a second steel needle is connected with the third steel ball, the third steel ball is used for blocking the opening A1, the other end of the second steel needle is connected with a combined hydraulic control plunger, the combined hydraulic control plunger is slidably connected into the control chamber f, and the oil inlet chamber h is communicated with the oil return chamber g. The opening A1, the cavity j, the oil inlet chamber h, the oil return chamber g and the oil return channel T1 are sequentially communicated. According to the all-steel ball type electromagnetic multi-way valve of the harvester, all reversing valves are composed of double-ball type pilot valves and steel ball type hydraulic control one-way valves. The anti-pollution capacity is extremely high, and the reliability is high.

The invention relates to the technical field of air valves, in particular to an air cylinder control valve. Comprising a valve body, and a pilot valve element and a main valve element are slidably arranged in the valve body; a first pilot cavity, a second pilot cavity, a pilot O1 cavity, a pilot A1 cavity, a pilot P1 cavity, a pilot B1 cavity and a pilot O2 cavity are formed by the pilot valve element and the inner wall of the valve body. A main valve P2 cavity, a main valve O3 cavity, a main valve A2 cavity, a main valve B2 cavity and a main valve O4 cavity are formed between the main valve element and the inner wall of the valve body. The main valve element slides in the valve body to switch connection and disconnection of the main valve P2 cavity, the main valve A2 cavity and the main valve B2 cavity. The two ends of the main valve element and the inner wall of the valve body form a first main valve cavity and a second main valve cavity, an outlet of the pilot A1 cavity communicates with the first main valve cavity, and an outlet of the pilot B1 cavity communicates with the second main valve cavity. Rapid reversing of the air cylinder can be achieved; the pilot valve element and the main valve element are arranged in the valve body, integration of the pilot valve and the main valve is achieved, and the sealing performance is guaranteed through the integrally-formed valve body structure.

The invention relates to the technical field of gate valve control systems, and discloses a pilot gate valve intelligent control system for a hydraulic valve, which comprises a valve body, and the valve body comprises a main valve clack, a hydraulic cavity, a pilot valve assembly, an intelligent control unit, a multi-source sensor, a human-computer interaction interface and a cloud server. According to the pilot gate valve intelligent control system for the hydraulic valve, a valve operation digital mirror image is built through the multi-source sensor set, the pressure sensor captures the pressure difference of a main valve, a reference is provided for water hammer suppression and the like, the electromagnetic flowmeter conducts non-contact measurement and adapts to multiple media, abrasion errors are avoided, and the magnetostriction displacement sensor monitors valve clack micro-motion; the vibration sensor carries out early warning on hidden dangers such as sealing abrasion through three-axis data, the temperature sensor corrects interference of fluid characteristics on control, the five sensors work cooperatively, all-directional monitoring of fluid parameters and mechanical states is achieved, data are accurately input for intelligent control, and efficient and stable operation of the valve is guaranteed.

The utility model belongs to the technical field of gate valves, and discloses a high-pressure gate valve. The high-pressure gate valve comprises a valve body, a gate plate and a pilot sealing assembly. Wherein the valve body is provided with a medium channel, the flashboard is arranged in the valve body in a sliding and penetrating mode, a cavity is formed in the flashboard, the flashboard is provided with a pilot gate and a conduction gate, the cavity is communicated with the pilot gate, the flashboard is provided with a first position and a second position relative to the valve body, and when the flashboard is located at the first position, the pilot gate conducts the medium channel in advance; when the gate plate slides from the first position to the second position, the breakover gate communicates with the medium channel, the circulation inner diameter of the pilot gate is smaller than that of the breakover gate, the pilot sealing assembly comprises a pilot valve plate and a buffer valve seat, the buffer valve seat is fixedly contained in the cavity and communicates with the pilot gate, and the pilot valve plate can slide relative to the buffer valve seat. Therefore, the pilot gate is blocked or conducted. According to the high-pressure gate valve, the opening torque can be reduced, and the sealing performance of the high-pressure gate valve is improved.

The invention discloses an overflow valve with an overpressure protection function, and belongs to the technical field of overflow valves, the overflow valve comprises a valve body, an oil inlet and an oil outlet are formed in the valve body, a communication cavity is formed in the valve body, a valve core is sleeved in the communication cavity, a damping hole is formed in the valve core, and a pressure plug is arranged in the valve body. When the damping hole is blocked, the driving block is driven by the up-down pressure difference of the valve element to extend out at a constant speed, the rotating rod and the threaded strip are driven to do multidirectional compound motion such as forward rotation, ascending, descending and reverse rotation in the damping hole, the shearing effect of full-circumferential covering is generated in the damping hole, sediments in the damping hole are cut and refined, and the damping effect is improved. Turbulent flow accelerated conveying is matched, secondary sedimentation is avoided, the efficient dredging effect on the damping hole is achieved, the vertical pressure difference of the valve element is eliminated in time, oil way pressure is responded and unloaded in time through the pilot valve, and damage to a mechanical structure caused by too large pressure is avoided.

The invention relates to the technical field of turnover plow hydraulic control, in particular to a turnover plow hydraulic control system and method, and the structure of the turnover plow hydraulic control system comprises a main control valve; the main valve communicates with the main control valve, and a throttling opening is formed in the end of the main valve; the first reversing valve is communicated with the main valve; the second reversing valve is communicated with the main valve; a large cavity of the amplitude modulation oil cylinder is communicated with the second reversing valve, and a small cavity of the amplitude modulation oil cylinder is communicated with the first reversing valve; a large cavity of the overturning oil cylinder is communicated with the first reversing valve, and a small cavity of the overturning oil cylinder is communicated with the second reversing valve; the pilot valve is communicated with the throttling opening of the main valve; the amplitude modulation oil cylinder and the overturning oil cylinder can be locked with each other and act in sequence. According to the hydraulic control system and method for the turnover plow, the problem that an existing turnover plow is complex to control can be solved.

The utility model provides an electromagnetic valve which comprises a valve body assembly, a valve core assembly, a valve core assembly, a valve core assembly, a valve core assembly and a valve core assembly, and is characterized in that the valve body assembly is provided with a circulation cavity, and the circulation cavity is provided with a valve port; the piston assembly is arranged in the circulation cavity, the piston assembly is used for blocking or opening the valve port, and the piston assembly is provided with a piston cavity; the pilot valve assembly is arranged on the piston assembly and provided with a pilot valve cavity and a pilot valve seat, the pilot valve seat is provided with a pilot valve port and a communicating channel, the pilot valve port is formed in the end, away from the piston assembly, of the pilot valve seat and used for communicating the connecting pipe with the pilot valve cavity, one end of the communicating channel communicates with the pilot valve cavity, and the other end of the communicating channel communicates with the piston cavity; a port, away from one side of the pilot valve cavity, of the communicating channel is coaxial with the pilot valve seat. By means of the electromagnetic valve, the problem that in the prior art, a pilot valve seat is difficult to machine can be solved.

The utility model provides a pilot valve assembly and a switching valve with the pilot valve assembly, and the pilot valve assembly comprises a pilot valve body which is provided with a first cavity and an exhaust port, and the exhaust port is communicated with the first cavity; the first capillary tube comprises a first air inlet and a first air outlet, and the first air inlet is communicated with the exhaust port; the exhaust pipe is fixed on the outer side of the pilot valve body, the exhaust pipe comprises a second air inlet, the second air inlet is communicated with the first air outlet, and the exhaust pipe is communicated with the first cavity through a first capillary tube. By means of the technical scheme, the problems that in the prior art, a pilot valve is large in size and complex in machining can be solved.

The invention relates to a flameout control method, system and equipment for a gas heating water heater and a medium. The gas heating water heater comprises a sealed combustion system, a Venturi mixer and a pneumatic gas valve which are sequentially communicated, and a command valve of the pneumatic gas valve is connected to an air purification bin of the sealed combustion system through an air pressure pipe. The method comprises the following steps: in a whole machine debugging stage, setting the pressure of a zero-position adjusting spring of a command valve of the pneumatic gas valve to be a negative value; in the operation stage of the water heater, whether the combustion flame is out of flame or not is determined based on the ratio of the gas flow to the air flow; the pneumatic gas valve is closed by the controller in response to a combustion flame off-flame stall. When the smoke pipe is seriously blocked, the pneumatic gas valve can be closed, so that the whole machine is shut down, and the gas heating water heater is protected.

The invention relates to the technical field of hydraulic valves, and discloses an integrated safety hydraulic control one-way valve integrated with a tail beam telescopic cylinder, which comprises a valve body, a through main channel arranged in the valve body and a valve core assembly arranged in the main channel, the valve core assembly comprises a joint valve sleeve, a valve core spring, a valve core, a valve seat, a liquid inlet valve sleeve, an ejector rod spring and an ejector rod, the valve seat is arranged between the connector valve sleeve and the liquid inlet valve sleeve, the valve element is arranged in an inner cavity of the connector valve sleeve in a sliding mode, and the ejector rod is arranged on the axis extension line of the valve element. The valve element is of a primary-secondary valve structure and comprises a main valve element and a pilot valve element coaxially arranged in the main valve element, an axial guide inner cavity is formed in the center of the interior of the main valve element and comprises a damping cavity and a conical surface plugging cavity, and a pilot valve channel is formed in the wall of the damping cavity. The problem that a valve element of a traditional hydraulic control one-way valve rapidly moves at the hydraulic control opening moment to generate severe mechanical impact is solved, and the service life of a valve set is prolonged.

The present disclosure provides a frequency-sensitive shock absorber capable of implementing target performance of damping force by preventing a valve portion formed of a rubber material or a synthetic resin material constituting a pilot valve of a valve assembly from peeling in a high-pressure and high-temperature environment and securing a flow path, and a valve assembly employed therein. An upper pilot valve and a lower pilot valve each include a base portion in the form of a metal plate and a valve portion integrally molded with the base portion as an elastic material passes through a molded hole formed in a penetrating manner in the base portion, and elastically deformed vertically.

The present invention relates to a high-frequency response semi-active shock absorber with adjustable damping, which includes an oil storage cylinder, a working cylinder, a piston rod and a bypass oil passage. A conducting one-way valve is arranged between the working cylinder and the oil storage cylinder, and both ends of the conducting one-way valve are respectively communicated with the lower end of the working cylinder and the inside of the oil storage cylinder. The piston body is provided with a conducting hole and a piston one-way valve for communicating the upper chamber and the lower chamber. The bypass oil passage includes a first branch oil passage, a second branch oil passage and a third branch oil passage which are arranged in parallel. A first switching valve and a first pilot valve are connected in series on the first branch oil passage. A second switching valve is arranged on the second branch oil passage. A first overflow valve is arranged on the third branch oil passage. The purpose of the present invention is to solve or at least alleviate the problem that the traditional passive hydraulic shock absorber cannot be adjusted in real time according to the vehicle load and line conditions, and to provide a high-frequency response semi-active shock absorber with adjustable damping.

The application provides a valve module and an electromagnetic valve, wherein the valve module comprises: a valve assembly, the valve assembly having a first accommodating cavity, a piston cavity and a pilot valve port; a moving iron core movably arranged in the first accommodating cavity, the moving iron core having a valve needle total cavity; a piston assembly for opening and closing the pilot valve port; the piston assembly having a through piston channel, one end of the piston channel being a pressure relief port and the other end of the piston channel being in communication with the pilot valve port; a return spring arranged in the first accommodating cavity, the return spring exerting elastic force on the moving iron core; a small valve needle arranged in the valve needle total cavity; wherein in a state in which the pilot valve port is closed, the moving iron core can abut against the piston assembly, and the small valve needle closes the pressure relief port. The application ensures that the elastic force of the return spring can act on the piston assembly through the moving iron core, and thus the electromagnetic valve switch is reliable. The application avoids that the elastic force of the return spring directly produces a large impact on the pressure relief port, and ensures the sealing of the pressure relief port in long-term use.

The invention belongs to the field of valve control, and discloses a pressure compensation system and method of a high-performance throttle valve. The method comprises the steps of collecting system operation data in real time; the system operation data comprises pressure data, vibration data, position data and temperature data; based on system operation data, a bipolar control system is designed through a primary pilot valve and a secondary pilot valve; when a non-linear impact working condition occurs, performing supplementary control on the bipolar control system through a sliding mode control compensation strategy; carrying out calibration test on the position data; and the control effect of the throttle valve under complex working conditions is effectively improved.

The utility model provides an integrated two-way cartridge proportional valve which comprises a main valve and a pilot valve. The main valve comprises an integrated valve seat, a main valve element, a main valve end cover, a sensor connecting end cover and a sensor assembly. A pilot valve installation face is arranged on the side face of the integrated valve seat of the main valve and used for installing the pilot valve, the pilot valve is a 10-drift-diameter servo proportional reversing valve, and an amplifier assembly and a proportional electromagnet with an integrated linear displacement sensor are arranged in the pilot valve. According to the utility model, the main valve part adopts the valve body and the valve sleeve which are of an integrated structure, so that the machining precision is reduced, the mounting difficulty is reduced, and the production components are reduced; a 10-drift-diameter servo proportional reversing valve and a proportional electromagnet with an integrated displacement sensor are adopted in a pilot valve part, zero covering is conveniently achieved through the design of a valve sleeve structure, normal use can be achieved on high-frequency-response and high-precision occasions, and meanwhile through two-stage displacement feedback, the control precision is higher, and the dynamic performance is better.

The utility model provides an electromagnetic valve which comprises a valve body assembly, a first valve port and a second valve port, the valve body assembly is provided with a circulation cavity, the first valve port and the second valve port are oppositely arranged, the first valve port is connected with a first connecting pipe, and the second valve port is connected with a second connecting pipe; the piston assembly is movably arranged in the circulation cavity so as to block or open the first valve port and the second valve port, and the piston assembly is provided with a piston cavity; the pilot valve assembly is arranged on the valve body assembly and used for controlling pressure in the piston cavity, the pilot valve assembly is provided with a pilot valve seat and a pilot valve cavity, the pilot valve cavity is communicated with the piston cavity, the pilot valve seat is provided with a flow channel structure, the pilot valve assembly is further provided with a first flow channel and a second flow channel, and the flow channel structure is communicated with the first flow channel, the second flow channel and the pilot valve cavity. The side, connected with the first connecting pipe, of the pilot valve seat and the side, connected with the second connecting pipe, of the pilot valve seat are symmetrically arranged along the plane where the axis of the pilot valve seat is located. By means of the technical scheme, the problem that in the prior art, a pilot valve assembly is complex in machining can be solved.

The utility model belongs to the technical field of bathroom accessories, and discloses a waterway switching device and a shower head. The waterway switching device comprises a fixed seat, a plurality of pilot valves and a plurality of valve shafts. A plurality of independent pressure cavities are formed by the pilot valves and the fixed seat respectively, and the pressure cavities are communicated with pressure relief channels; the pressure cavity communicates with the water inlet end through the pilot valve. The valve shafts are in one-to-one correspondence with the pressure cavities and can block or open the corresponding pressure relief channels. The pressure relief channel is opened, the corresponding pressure cavity relieves pressure, and the pilot valve moves under the action of water pressure to enable the water inlet end to be communicated with the corresponding water outlet main flow channel; and water in the pressure cavity can flow out to the downstream flow channel through the corresponding pressure relief channel. According to the waterway switching device, the switching stroke of the valve shaft can be shortened, the switching mode is simplified, and the switching force of a user is saved.