877 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 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 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.

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 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 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 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 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 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.

The invention relates to a pilot-operated bacteria valve. The pilot-operated type fungus valve comprises a main valve mechanism, the main valve mechanism comprises a main valve shell and a main valve element, the main valve shell is provided with a main valve cavity, a feeding channel, a discharging channel and a pilot channel, and the main valve element is configured to cut off the feeding channel and the discharging channel and conduct the feeding channel and the pilot channel in a closed state and conduct the feeding channel and the discharging channel in an open state; the pilot valve mechanism is connected with the main valve shell, the pilot valve mechanism is provided with a pilot valve cavity, and the pilot valve cavity communicates with the pilot channel; the flow guide mechanism comprises a flow guide pipeline, and the flow guide pipeline communicates with the guide valve cavity and the discharging channel; the pilot valve mechanism is configured to be used for separating the pilot channel and the flow guide pipeline or communicating the pilot channel and the flow guide pipeline. The pilot-operated mushroom valve controls the opening and closing of the main valve core through the pilot valve mechanism, so that the driving force required by the action of the main valve core can be reduced, the structural size of the pilot-operated mushroom valve is reduced, and the weight is reduced.

The invention relates to the technical field of electromagnetic valves, and discloses a low-turbulence electromagnetic valve with a conical flow guide valve element structure, which comprises a valve body, pilot valve components are mounted at the left end and the right end of the valve body, direct-acting iron core components are mounted at the opposite ends of the pilot valve components on the left side and the right side, and a main valve element is arranged in a main runner of the valve body. The valve body and the main valve element are jointly provided with a protection part, and the valve body is provided with a lubricating part corresponding to the main valve element. The low-turbulence electromagnetic valve provided with the conical flow guide valve element structure can effectively solve the problems that in the prior art, severe turbulence is generated when a medium flows through, pressure loss is increased, energy consumption is increased, pipeline vibration and cavitation phenomena are induced, and the stability of a high-purity fluid system is seriously restricted; the problems that abrasion is caused by frequent reciprocating motion of the valve element in the valve body, the fit clearance is gradually increased, inner leakage and response delay occur, even clamping stagnation and failure of the valve element are caused by excessive abrasion, and the mechanical service life is directly influenced are solved.

The breathing integrated pilot external breather valve comprises a main valve body, the main valve body is installed on a storage tank, a main valve seat and a main valve disc are arranged in the main valve body, and an inlet and an outlet are formed in the side face of the main valve body; the pilot valve is arranged at the outer part of the main valve body; the interior of the main valve body is divided into a first cavity located below the main valve seat, a second cavity located above the main valve seat and a third cavity located above the second cavity. The first cavity is communicated with a storage tank, and the second cavity is connected with a gas treatment device through the inlet / outlet; the third cavity is connected with the upper end of the main valve rod; the pilot valve is respectively connected with the first cavity and the third cavity; when the positive pressure in the storage tank exceeds a positive pressure value or a negative pressure value, the pilot valve acts to form a pressure difference between the first cavity and the third cavity, so that the main valve disc jumps, the first cavity and the second cavity are communicated, and the breathing action of the main valve body is completed.

The invention belongs to the technical field of valves, and discloses a single-action pneumatic actuator control system which comprises a gas supply gas circuit, a pneumatic pilot valve, a first electromagnetic valve, a pilot loop and a delayed discharge loop. And the delayed discharge loop is configured to discharge the air pressure in the control air cavity, and after a preset time, the air pressure is gradually reduced to be below a set value so as to cut off the pneumatic pilot valve. During power failure in a whole platform range, the time-delay discharge loop can enable the whole control system to automatically switch into a pure pneumatic time-delay mode, so that the situation that the BDV immediately enters an open state due to power loss of the first electromagnetic valve is avoided, and the environmental adaptability and long-term operation reliability of the control system under extremely severe environments such as an ocean platform and flammable and explosive environments are remarkably improved; the safety performance is improved.

The utility model provides a three-way valve which comprises a valve body provided with a valve cavity, a first connecting pipe and a second connecting pipe are arranged on the side wall of the valve body, and the first connecting pipe and the second connecting pipe are both communicated with the valve cavity; the valve element is movably arranged in the valve cavity and provided with a first sealing end and a second sealing end which are oppositely arranged, the first connecting pipe and the second connecting pipe are both located between the first sealing end and the second sealing end, the first sealing end is matched with the valve cavity to form a first cavity, the second sealing end is matched with the valve cavity to form a second cavity, and a plugging piece is arranged on the valve element. The plugging piece is used for plugging the first connecting pipe or the second connecting pipe; the pilot valve communicates with the valve cavity and is used for controlling the pressure difference between the first cavity and the second cavity so as to drive the valve element to move. According to the technical scheme, the problem that in the prior art, a three-way valve product is large in size and complex in structure, and consequently the manufacturing cost is increased can be solved.

The invention relates to a hybrid optimization method for dynamic response of a valve element of a CDC electromagnetic valve, and belongs to the technical field of automobile suspensions. The method comprises the following steps: (1) establishing a three-dimensional equivalent model of the CDC electromagnetic valve; (2) building a CDC electromagnetic valve system throttling principle model, determining an oil path, building the valve system throttling principle model by using fluid mechanics, and determining a pressure flow relation of each valve system; (3) building a stress model of the pilot valve and the main valve core; (4) selecting target optimization structure parameters; (5) constructing hypercube mapping and generating an initial population; (6) carrying out dual-core coevolution to carry out main circulation; (7) judging whether a termination condition is met or not; and (8) outputting a result. According to the method, through a dual-core collaborative architecture and an adaptive search mechanism, the inherent defect that the exploration breadth and the development depth are difficult to consider in a traditional method is effectively overcome, and the optimal solution is quickly and accurately searched in a global range.

An electromagnetic valve for a variable-damping shock absorber belongs to the technical field of variable-damping shock absorbers and comprises a coil portion, a hydraulic portion and an electromagnetic portion connected between the coil portion and the hydraulic portion, the hydraulic portion comprises a hydraulic shell, a main valve component, a pilot valve component and an oil liquid communication component connected between the main valve component and the pilot valve component are arranged in the hydraulic shell, and the main valve component and the pilot valve component are connected through the oil liquid communication component. The electromagnetic valve has the advantages that the internal structure of the electromagnetic valve is optimally designed, so that the movement relevance of the main valve and the pilot valve is higher, the pressure output of the electromagnetic valve can be more stably controlled, the fluctuation of the damping force of the shock absorber is reduced, and the working reliability of the shock absorber can be improved.

According to the pilot valve, the vacuum valve, the vacuum valve system and the method for recovering the initial condition of the vacuum valve, different from an existing pilot valve which is only used for controlling negative pressure to enter a main valve so that the main valve can open or close a drainage channel, after improvement, related cavities of the pilot valve are communicated, the negative pressure is introduced into the main valve, and meanwhile the negative pressure enters the main valve; the liquid level difference is also introduced into the related cavity of the pilot valve, so that the pilot valve can still keep the state in the water pumping process of the vacuum valve even if the liquid level difference is lower than a preset value, and the vacuum valve continuously pumps water until the liquid level in the facility is lower than the bottom of the water suction pipe, and air is sucked into the related cavity of the pilot valve to dilute the negative pressure amount of the related cavity; therefore, the pilot valve can restore to the initial position, the vacuum valve is triggered again, and the initial liquid level of the vacuum valve can restore to be consistent.

The disclosure relates to a method for operating an electropneumatic parking brake module for an electronically controllable pneumatic brake system for a vehicle, in particular a commercial vehicle, having a supply port for receiving a supply pressure, at least one parking brake port for the connection of at least one parking brake cylinder, a main valve assembly which receives the supply pressure and is configured to output a spring brake pressure at the parking brake port in dependence on a control pressure, and a pilot valve assembly which receives the supply pressure and is to provide the control pressure, wherein the pilot valve assembly has a bistable valve which can be switched between a first air admission position and a second air release position, and a control unit for providing first and second switch signals to the pilot valve assembly.

A hydraulic retarder pneumatic control system based on an electromagnetic valve comprises an air source and an oil pool shell, the air source is sequentially connected with a pilot valve and a first inlet of a pneumatic valve in series, and the air source is further communicated with a second inlet of the pneumatic valve; an outlet of the pneumatic valve is connected in series with at least two parallel solenoid valves, outlets of the solenoid valves are connected in series with a quick discharge valve, and a first outlet of the quick discharge valve is communicated with the oil pool shell. Through reasonable arrangement of component structures and design of a pilot valve, no back pressure resistance exists during starting, the reversing resistance is small, and the system response time is greatly prolonged; and meanwhile, the electromagnetic valve is located behind the pneumatic valve, so that the starting backpressure is small, the starting power is small, quick response of work of the retarder is integrally achieved, the work response time is shortened, the cost is reduced, the overall stability of the system is improved, and the service life is prolonged.

The invention relates to the field of valve structures, in particular to a fluid control system integrating a gate valve and a pressure reducing valve. The control system comprises a pressure reducing valve, a gate valve, a pilot valve device and a brake separating device. The brake separating device is linked and synchronously prevents upstream fluid from entering a flow guide cavity of the pilot valve device before the pilot valve device is adjusted, the high-pressure impact risk is eliminated, and a zero-pressure calibration environment is established. The pilot valve device serves as a pressure adjusting center, the swing piece of the pilot valve device swings around the rotating shaft under driving of fluid pressure, the first plunger and the second plunger are synchronously driven by the connecting rods on the two sides to axially and reversely move, and when high-pressure fluid pushes the first plunger to move into the flow guide cavity to open a high-pressure port, the high-pressure port is opened. And the second plunger is linked to move to synchronously open the low-pressure port to form a pressure relief channel. When the output pressure is increased abnormally, the fluid drives the second plunger in the reverse direction to press the sealing face tightly, the high-pressure port is locked in a linkage mode through the swing piece, the action is in linkage with the diaphragm of the pressure reducing valve to drive the valve clack to close the valve port, and overpressure cutting-off and dynamic pressure balance are achieved.

The invention provides a pilot operated safety valve with a double-corrugated-pipe sealing structure and a runner system.The pilot operated safety valve comprises a main valve body, a pilot valve and a corrugated pipe assembly, the main valve body is provided with a main cavity, and the main cavity is provided with a main valve inlet and a main valve outlet; the corrugated pipe assembly comprises a connecting seat, a first corrugated pipe, a second corrugated pipe and a valve seat, the connecting seat is connected with the main valve body, the first corrugated pipe is arranged on the outer side of the second corrugated pipe in a sleeving mode, and the two ends of the first corrugated pipe and the two ends of the second corrugated pipe are correspondingly connected with the connecting seat and the valve seat to define an adjusting cavity; and the connecting seat is provided with a connecting flow channel for communicating the adjusting cavity with the first outlet of the pilot valve. The valve seat is movable within the main chamber to open and close the main valve inlet and outlet. When the main valve inlet pressure is larger than the adjusting cavity pressure, the two corrugated pipes drive the valve seat to move so as to communicate the main valve inlet with the main valve outlet. The axial sealing performance is improved, opening and closing of the safety valve are adjusted and controlled, and the stability of the safety valve is improved.

The invention discloses an automatic backwash return liquid filter station which comprises a frame, a backwash control valve, an electromagnetic pilot valve, a control substation, a filter cartridge, a liquid inlet pipeline and a liquid outlet pipeline are fixedly connected to the frame, a backwash high-pressure liquid inlet is formed in the backwash control valve, and the backwash control valve is connected with a high-pressure liquid pipeline through the backwash high-pressure liquid inlet; a pilot control liquid outlet and a backwashing liquid outlet are formed in the backwashing control valve and are respectively connected with a pilot control liquid inlet and a backwashing liquid inlet pipeline on the filter cartridge through the pilot control liquid outlet and the backwashing liquid outlet; the filter cartridge is arranged between the liquid inlet pipeline and the liquid outlet pipeline and filters emulsion in the liquid inlet pipeline and then enables the emulsion to flow out of the liquid outlet pipeline, pressure sensors are arranged on the liquid inlet pipeline and the liquid outlet pipeline, the pressure sensors are in circuit connection with the control substation, the control substation is in circuit connection with the electromagnetic pilot valve, and the electromagnetic pilot valve is in circuit connection with the electromagnetic pilot valve. The electromagnetic pilot valve is fixedly connected to the backwashing control valve and is used for controlling the opening and closing states of the backwashing control valve.