1564 results about "Pilot valve" patented technology

The invention discloses a pipeline pressure relief structure and a pressure relief valve with the pressure relief structure, and relates to the field of pressure relief valves, the pipeline pressure relief structure comprises a main valve, a tower-shaped valve core, a pressure gauge, an amplification gear and a labor-saving lever, and changes the situation that in the prior art, precision of a pilot valve is adjusted through a needle valve, and the needle valve and the pilot valve need to continuously play a sensing role through similar structures such as springs; a tower-shaped valve element is arranged in a main valve to conduct multi-section control over flow, then driving force on the tower-shaped valve element is amplified in a multiplied mode through a hinge rod, an amplification gear and a labor-saving lever, accurate adjustment of the tower-shaped valve element is guaranteed, and the control precision of equipment is guaranteed. In addition, the pressure gauge is connected in the pilot valve through the oil bag, and the carry block facilitating adjustment of the elastic force of the piston by the spring is arranged, so that the pilot valve can be calibrated according to the display of the pressure gauge and the flow change of the main valve, the service life of the pressure relief valve structure is prolonged, and more accurate adjustment and use of the pressure relief structure are ensured.

The invention relates to the technical field of temperature and pressure reduction, and provides a temperature and pressure reducer provided with a rapid limiting structure and convenient to install, which comprises a valve body, a temperature and pressure reducing mechanism, a temperature and pressure reducing mechanism, a pressure reducing mechanism and a pressure reducing mechanism, and is characterized in that the valve body comprises a main valve module and a pilot valve module; the main valve clack rotates and moves up and down according to the pressure, the number of the throttling holes facing the steam inlet is changed, the size of the throttling holes facing the steam inlet is adjusted, and output steam is more stable and more accurate; desuperheating water is input into the main valve clack through the flow guide pipe through the booster pump and sprayed into high-pressure steam flowing in from the steam inlet through the spray head, so that the desuperheating water and the high-pressure steam are mixed more evenly, and the atomization effect is improved. The sliding sleeve is driven by the main valve clack to move downwards, the nozzle area of the spray head is reduced, and therefore the amount of attemperation water is rapidly reduced, rapid limiting is achieved, and the situation that due to excessive attemperation water, evaporation is incomplete, temperature adjustment is inaccurate, and the attemperation effect is affected is prevented.

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

The invention 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 utility model provides a combined hydraulic valve of a high-lift system. The combined hydraulic valve is composed of an electric connector unit, a shell assembly unit, a pilot control unit and a main valve unit. Wherein an oil filter assembly is arranged at an oil inlet of the pilot control unit; according to the pilot control unit of the combined hydraulic valve, the oil filter assembly is arranged at the oil inlet, foreign matter can be prevented from entering an inner cavity of the pilot valve, and therefore abnormal opening or closing of the pilot valve is avoided; the guide rod and the guide sleeve of the main valve unit are sealed in a sliding ring combination mode, oil leakage is avoided, therefore, the fit clearance of the main valve unit can be properly increased, after the fit clearance is increased, the situation that normal reversing action cannot be achieved due to valve clamping stagnation caused by oil pollution can be avoided, and the anti-pollution capacity of a product is improved.

The invention discloses a trencher based on improvement of excavating equipment, which is characterized in that an original excavating working device is detached from an upper body of an original excavator, and a trenching device is additionally arranged on the upper body of the original excavator; the ditching device comprises a supporting arm frame and a ditching chain. The supporting arm frame is connected with the original upper machine body and rotationally provided with a driving wheel set and a tensioning wheel set. The trenching chain is arranged on the driving wheel set and the tensioning wheel set in a sleeving mode so as to conduct continuous trenching operation; the original engine-hydraulic power system is additionally provided with a ditching driving motor, and the ditching driving motor is connected with a driving wheel set; the ditching driving motor realizes rotary driving and stopping actions of the ditching chain through an original movable arm oil cylinder confluence oil way in the original engine-hydraulic power system and is additionally connected with a pilot valve for control; the original left and right track driving oil ways are respectively connected with the small-flow proportional valves, the small-flow proportional valves are respectively connected with the original left and right track driving oil ways in parallel, a small part of hydraulic power is shunted from the original main pump oil way, the trencher is driven to crawl at a low speed during trenching operation, and the trencher can move while trenching during operation.

The utility model relates to the technical field of valves, in particular to a pressure holding and releasing valve with a shock absorption function, which comprises a valve body, a valve cover, a pressure releasing guide valve, a valve rod, a main valve clack, a reset spring and a buffer mechanism, and adopts a mode of buffering rebound of the valve rod to effectively relieve impact force of the main valve clack on the valve body, reduce vibration frequency of the valve and peripheral pipelines and improve safety of the valve. The service life of the valve and the pipeline is prolonged, the sealing performance of the valve body is guaranteed, and the technical problem that the service life of the pressure maintaining and releasing valve and the peripheral pipeline is easily affected by vibration generated by frequent opening and closing conversion of the valve in the prior art is effectively solved.

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.

The utility model provides a main valve and a switching valve, the main valve comprises a valve pipe, the side wall of the valve pipe is provided with a plurality of assembling holes used for installing connecting pipes, the side wall of the valve pipe is further provided with an installing hole, and the installing hole is used for installing a guide valve; and the mounting hole and one assembly hole are coaxially arranged. According to the scheme, the mounting hole and the assembly hole are coaxially arranged, machining of the two holes is facilitated, the mounting hole can be punched and formed through a punch penetrating through the corresponding assembly hole, in this way, after the assembly hole is machined, the mounting hole can be machined continuously without clamping the main valve again, the clamping frequency is reduced, and the machining efficiency is improved; and the mounting hole is formed by punching outwards from the inside of the valve pipe, so that the formed hole is a hole with an outer flange, and after the valve pipe is connected with the pilot valve, compared with an existing hole without a flange, the connecting area is longer, and the connecting strength is improved. According to the scheme, the machining efficiency of the main valve and the connecting strength of the main valve and the pilot valve are improved.

Apparatus for regulating gas pressure suitable for use in systems and / or networks for transport and / or distribution of gas, the apparatus configured to be connected upstream with an inlet duct for the gas and downstream with an outlet duct, and includes:a main regulator including:an inlet area fluidically connectable with the inlet,an outlet area fluidically connectable with the outlet,a shutter which acts between the inlet area and the outlet area,means configured to push the shutter towards a closed position,a motorization chamber in which a movable element is housed,a pilot regulator including:an inlet which is fluidically connected with a first sub-chamber, to thus allow the passage of gas from the first sub-chamber towards an inlet of the pilot regulator,an outlet which is fluidically connected to said second sub-chamber, andat least one pilot valve.

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 discloses an energy-saving type electromagnetic pulse valve which comprises a valve body, a valve cover arranged on the valve body, a first diaphragm assembly installed between the valve body and the valve cover and a pilot valve assembly installed at the upper end of the valve cover, and the valve body is provided with an air inlet, an air outlet and a first valve port communicated with the air inlet and the air outlet. The pilot valve assembly controls the first diaphragm assembly to open and close the first valve port, the inner wall of an air outlet of the valve body is provided with a concave-convex section so that compressed air can be sprayed out in a pulse mode after passing through the concave-convex section, the inner wall of the air outlet is in a concave-convex arc design so that the compressed air can be sprayed out in a pulse mode after passing through the concave-convex section, and the ash removal effect is improved. Meanwhile, consumption of compressed gas is reduced, and energy waste is reduced.

The invention relates to the technical field of hydraulic control, and provides a hydraulic cylinder control system and method. The water-based proportional directional valve comprises a first proportional pilot valve group, a first proportional directional valve, a second proportional pilot valve group and a second proportional directional valve, the first proportional pilot valve group and the second proportional pilot valve group are respectively connected with the hydraulic support controller, the first proportional pilot valve group is connected with the first proportional directional valve, and the second proportional directional valve is connected with the second proportional directional valve. The second proportional pilot valve group is connected with the second proportional reversing valve; the hydraulic cylinder comprises a first cavity and a second cavity, the first cavity is connected with the first proportional directional valve, and the second cavity is connected with the second proportional directional valve. The stroke of the hydraulic cylinder can be accurately controlled, and accurate control over the hydraulic support and the whole working face is achieved; the water-based proportional reversing valve is simple in structure and high in response speed, and the control accuracy of the hydraulic cylinder is further improved.

The self-power-generation digital pressure reducing valve comprises a main valve and further comprises an electric pressure reducing guide valve, a water inlet of the electric pressure reducing guide valve is connected with a water inlet end of the main valve through a first pipeline, and a water outlet end of the main valve is connected with a water outlet of the electric pressure reducing guide valve through a second pipeline. A water outlet of the electric pressure reduction pilot valve is connected with a diaphragm upper cavity of the main valve control chamber through a third pipeline; the diaphragm lower cavity is connected with the outside through a fourth pipeline, a fifth pipeline is further connected between the water inlet end and the water outlet end of the main valve, and a hydroelectric generator is arranged on the fifth pipeline; the pressure detection devices are arranged in front of and behind the main valve; the controller is used for receiving detection signals of the pressure detection devices so as to control opening and closing of the electric pressure reduction pilot valve; and the hydroelectric generator is connected with the pressure detection device and the electric pressure reduction pilot valve. According to the digital pressure reducing valve, self power generation can be achieved, the power utilization requirement of electric equipment is met, and remote regulation and control can be achieved.

The utility model provides a valve structure and a shock absorber. The valve structure comprises a valve sleeve; the valve armature is located in the valve sleeve and is configured to do reciprocating motion in the axis direction of the valve armature; the valve rod penetrates through the valve armature and is fixedly connected with the valve armature, and the valve rod comprises a first part and a second part which are arranged at the two ends in the axis direction; the second part is exposed from the valve armature; the pilot valve is connected with the second part so as to drive the pilot valve to reciprocate in the axis direction through the second part; at least part of the valve armature is guided in the valve sleeve. In the valve structure, the valve armature is guided by the valve sleeve, so that the valve armature and the valve rod can reliably move in the axial direction without deviation.

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.