533 results about "Pilot valve" patented technology

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 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 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 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 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.

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 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.

The utility model relates to a pilot-operated type pressure balance pneumatic valve which comprises a valve body, a valve cover and a valve rod, and a valve seat is installed at the position of a valve shoulder of the valve body. The valve body is connected with the valve cover through a bolt; a through hole is formed in the center of the valve deck, the valve rod moves up and down along the through hole in the valve deck, and a sleeve is arranged on the upper portion of the valve seat and fixed in the valve body through the valve deck. A valve clack is arranged in the sleeve and moves up and down in the sleeve; a pilot valve core is arranged in the valve clack; a pressure balance disc is arranged on the top of the pilot valve element. The thrust requirements of the valve in the opening, closing, opening process, closing process and semi-opening state are greatly reduced, the opening process and the closing process only need to overcome friction of all parts and can be achieved without overcoming medium pressure, and meanwhile the medium auxiliary sealing effect in the full-closing state of the valve is reserved; while the good sealing performance is met, the opening and closing thrust of the valve is reduced, the operability of the valve is improved, and the requirement for an actuator is reduced.

The invention provides an online detection device and method for an electromagnetic pilot valve. The online detection device for the electromagnetic pilot valve comprises a main conveying line, a plurality of conveying line branches working in parallel and detection subsystems corresponding to the conveying line branches. The main conveying line is used for linking a plurality of detection subsystems and butting a plurality of conveying line branches working in parallel; the plurality of conveying line branches working in parallel are used for simultaneously conveying to-be-detected electromagnetic pilot valves to each detection subsystem station; the detection subsystem comprises a feeding and discharging robot and a detection assembly, and the feeding and discharging robot is used for transferring the to-be-detected electromagnetic pilot valve from the main conveying line to each conveying line branch and grabbing the to-be-detected electromagnetic pilot valve to move among different detection stations; the detection assembly is used for executing various types of tests on the to-be-detected electromagnetic pilot valve, the problem that the detection rhythm and efficiency cannot be matched with an automatic assembly line can be solved, seamless butt joint with the automatic assembly line is achieved, and the production efficiency is improved.

The present application relates to the technical field of hydraulic pressure, in particular to a multi-way valve and a hydraulic system for controlling sequential action. A multi-way valve for controlling sequential action of at least two execution elements, comprising at least two working links, the working links are arranged corresponding to the execution elements, the working links comprise: a control valve for controlling action of the corresponding execution element; a pilot valve arranged corresponding to the control valve, the pilot valve controls the pilot oil to flow into or out of the control valve; in the initial state, the pilot oil can flow into the control valve through the pilot valve, so that the control valve reverses to control the action of the corresponding execution element; after the corresponding execution element moves to the position, the oil pressure in the oil inlet cavity of the execution element rises to trigger the pilot valve to reverse, the pilot oil flows out through the reversed pilot valve, and is used as the pilot oil of the working link corresponding to the execution element for the next action. The technical problem of the prior art that the hydraulic system has many complicated hydraulic elements and oil paths, and the oil liquid through the sequence valve causes pressure loss is solved.

The invention relates to the technical field of pressure reducing valves, in particular to an anti-blocking pilot pressure reducing valve which comprises a pilot valve, a main valve body, an end cover, a pilot valve element, a main valve element and a discharging assembly, the pilot valve is fixedly installed above the main valve body, the end cover is fixedly installed below the main valve body, the main valve element is installed in the main valve body in a sliding mode, and the main valve element is fixedly installed in the main valve body. The pilot valve element is arranged in the pilot valve, an oil flowing channel is formed in the end cover, a damping hole penetrating through the upper end and the lower end is formed in the main valve element, the damping hole communicates with the oil flowing channel, and the discharging assembly is arranged in the end cover and achieves opening and closing of the oil flowing channel through pressure change. Through the pressure difference generated in the pilot-operated type pressure reducing valve, pollutants and impurities separated out by hydraulic oil are prevented from being attached to the inner wall of the oil flowing hole, the main valve element is prevented from being blocked, and normal work of the pilot-operated type pressure reducing valve is guaranteed.

The application relates to a priority control system, and discloses an action priority control system and an action priority control method. The action priority control system comprises a plurality of sequentially arranged action links, an oil inlet oil path, a pilot oil inlet oil path, a pilot oil return oil path and a controller which are connected with each other, the action link comprises a main valve connected with an actuator, a control port of the main valve is connected with the pilot oil inlet oil path and the pilot oil return oil path through a pilot valve, a priority control valve is arranged on the oil inlet oil path between adjacent action links, and under a composite action working condition, a valve port opening degree of the priority control valve is controlled by the controller according to pressure signals before and after the priority control valve, so as to control the flow distribution to the action link in the front rank. The application can adapt to the frequent change of the load in actual work, accurately distribute the flow, has good controllability, high work efficiency, small energy consumption and simple structure.

This utility model relates to a pressure reducing valve body that is easy to maintain, belonging to the technical field of pressure reducing valve bodies. It includes a main valve, a pilot valve, a first connecting seat, and a second connecting seat, with an installation structure between the main valve and the pilot valve. This easy-to-maintain pressure reducing valve body connects the main valve and the pilot valve through the first and second connecting seats. An elastic plate elastically engages a retainer inside, limiting the second connecting seat. A semi-circular seat, a limiting annular sleeve, and a rubber sleeve cooperate to connect, and friction and limiting forces limit the connection between the first and second connecting seats, thereby improving the stability of the connection between the main valve and the pilot valve. The mounting seat, friction limiting plate, and limiting side plate limit the limiting annular sleeve and the elastic plate, improving the strength and stability of the overall connection structure. Furthermore, the snap-fit ​​installation improves the ease of disassembly between the main valve and the pilot valve.

The follower-type pilot-operated water-based proportional valve according to the present invention includes: a valve body having a valve body cavity, a valve inlet, a valve outlet, a first inlet channel, a second inlet channel, and a first return channel; a main valve core defining a first control cavity, a second control cavity, and a return cavity with the valve body, the first inlet channel communicating with the first control cavity, and the second inlet channel communicating with the second control cavity, wherein the main valve core includes a blocking section and a driving section, the driving section being located on the side of the blocking section opposite to the valve body cavity in a first direction, and the driving section having a first working surface and a second working surface opposite to each other in the first direction; a pilot valve core slidably disposed in a first inner hole along the first direction; a lever located outside the valve body, the lever being rotatable relative to the valve body; and a driving device capable of driving the pilot valve core to move in the first direction. Therefore, the follower-type pilot-operated water-based proportional valve according to the present invention has the advantages of simple structure and easy proportional control.

The invention discloses a track tensioning hydraulic control system and a track tensioning hydraulic control method for a large excavator. The system comprises a hydraulic system formed by a first tensioning oil cylinder, a second tensioning oil cylinder, a first tensioning valve group, a first energy accumulator, a second tensioning valve group, a second energy accumulator, a balance valve, a pilot valve, a detection element, a first speed reducer, a first power assembly, a second power assembly, a second speed reducer, a third power assembly, a fourth power assembly and the like. The method comprises the steps that the pressure of an energy accumulator oil charging loop is monitored through a detection element; when the pressure value monitored by the detection element continuously exceeds a first preset pressure threshold value, the controller judges that the unloading tensioning is abnormal; the controller executes a corresponding fault processing program according to the abnormal state; if the pressure is abnormal, an alarm signal is sent out; and if the pressure abnormal state continuously exceeds the first preset duration, a shutdown control signal is output, and the walking system is controlled to stop working. The system is reliable, low in cost and simple in structure.

The utility model provides a remote switching combined shower head. A switching structure is switched among a first position, a second position and a third position under the action of external force; when the switching structure is located at the first position, the first inlet is communicated with the water inlet end of the handheld shower head, the second inlet is communicated with the third inlet, the pilot valve structure is opened, and the water inlet end is communicated with the water inlet end of the head shower head; when the switching structure is located at the second position, the first inlet is communicated with the water inlet end of the handheld shower head, the second inlet is disconnected from the third inlet, the pilot valve structure is disconnected, and the water inlet end is disconnected from the water inlet end of the head shower head; when the switching structure is located at the third position, the first inlet is disconnected with the water inlet end of the handheld shower head, the second inlet is communicated with the third inlet, the pilot valve structure is opened, and the water inlet end is communicated with the water inlet end of the head shower head.

Disclosed is a self-power-generating digital pressure reducing valve, comprising a main valve (1), and further comprising an electric pressure reducing pilot valve (2). A water inlet port of the electric pressure reducing pilot valve (2) is connected to a water inlet end of the main valve (1) by means of a first pipe (3); a water outlet end of the main valve (1) is connected to a water outlet port of the electric pressure reducing pilot valve (2) by means of a second pipe (4); the water outlet port of the electric pressure reducing pilot valve (2) is connected to an upper diaphragm cavity of a main valve control chamber by means of a third pipe (5); a lower diaphragm cavity is connected to the outside by means of a fourth pipe (15); a fifth pipe (6) is further connected between the water inlet end and the water outlet end of the main valve (1); and a hydroelectric generator (7) is provided on the fifth pipe (6). The digital pressure reducing valve further comprises pressure detection devices (8) arranged before and after the main valve, and a controller for receiving detection signals of the pressure detection devices (8) so as to control the opening and closing of the electric pressure reducing pilot valve (2); and the hydroelectric generator (7) is connected to the pressure detection devices (8) and the electric pressure reducing pilot valve (2). The digital pressure reducing valve can achieve self-power generation to meet power utilization requirements of electric devices, and can be remotely regulated and controlled.

Improves the opening performance of normally open pilot operated solenoid valves. [Solution] The valve comprises a sub-valve chamber 30 which includes a back pressure chamber 34 and selectively communicates with a pilot valve chamber 48, a sub-valve port 32 which communicates the pilot valve chamber 48 with the sub-valve chamber, a sub-valve element 29 which is movable relative to the pilot valve element and moves back and forth with respect to the sub-valve seat to open and close the sub-valve port, a first coil spring 36 which urges the pilot valve element in the valve opening direction via the sub-valve element and moves the pilot valve element and the sub-valve element in the valve opening direction when the drive device is not driven, a second coil spring 37 which is interposed between the pilot valve element and the sub-valve element and urges the pilot valve element in the valve closing direction and the sub-valve element in the valve opening direction, a seal member 18 which can block the flow of fluid between the pilot valve chamber and the sub-valve chamber when the pilot valve port is closed by the pilot valve element and the sub-valve port is closed by the sub-valve element, and an introduction passage 17 which communicates the sub-valve chamber with the outflow passage when the pilot valve port is closed by the pilot valve element.

The application discloses a pressure reducing valve with positive fluctuation of output pressure with output flow, comprising a pressure reducing valve and a pilot valve, wherein a pressure regulating spring and a stiffness adjustable spring are arranged in the pilot valve, the action of the valve rod of the pressure reducing valve directly pushes the stiffness adjustable spring in the pilot valve, and the stiffness of the stiffness adjustable spring is smaller than that of the pressure regulating spring; the input port of the pressure reducing valve is connected with the control cavity and the inlet of the pilot valve through a connecting pipeline and an adjustable throttle valve, and the output port is connected with the output pressure feedback interface of the pilot valve through a connecting pipeline and a stop valve. The output pressure of the pressure reducing valve positively fluctuates with the output flow, the output pressure is large when the water flow is large, and the output pressure is small when the water flow is small, so that the pressure borne by the whole pipeline system in the water low period is reduced, the pipe leakage and pipe explosion rate are reduced, the reliability of the water supply system is improved, and the maintenance cost is reduced.

The utility model relates to a chemical and automation control technical field, concretely relates to a valve air source amplifier, including main valve body, pilot valve cover and lower valve cover, being equipped with main gas channel in main valve body, and the both ends of two lower sides of main gas channel left side are respectively communicated with air inlet and pressure release port, and the right side of main gas channel is communicated with output port, and being equipped with pilot control port on pilot valve cover, still including controlling means, and controlling means includes piston, valve rod, upper valve head and lower valve head, and valve rod sliding installation is in main valve body, and is located in main gas channel, and upper valve head fixed mounting is on valve rod upper end, and lower valve head fixed mounting is on the lower extreme of valve rod, and piston fixed mounting is on upper valve head, and the opening or plugging of main gas channel through upper valve head and lower valve head on valve rod makes high pressure gas be accelerated through the ring interval passage between main gas channel and valve rod, and the pressure relief of output port through pressure release port, thereby realizes the efficient control to gas circuit, and saves the cost.

The invention discloses a pilot-operated valve internal part of a regulating valve, the regulating valve comprises a valve main body provided with a valve front cavity, a valve rear cavity and a balance cavity, the pilot-operated valve internal part comprises an upper sleeve, a lower sleeve, a valve seat, a small valve core, a spring and a valve plug, the upper sleeve, the lower sleeve and the valve seat are all fixedly arranged in the balance cavity, the upper sleeve is provided with an overflow hole, and the valve plug is provided with an overflow hole; the lower sleeve is provided with a flow characteristic control window, and the valve plug is installed in the balance cavity in a suspension installation mode. The valve plug is provided with an auxiliary fluid through hole, the small valve element is movably connected to the middle of the valve plug, and a spring is further arranged between the small valve element and the valve plug. The valve main body is also internally provided with two fluid channels, and the main fluid channel passes through the sealing surface of the valve seat from the valve front cavity to the valve rear cavity; the auxiliary fluid channel is from the valve front cavity to the balance cavity through the overflow hole and then to the valve rear cavity through the sealing surface of the small valve seat; the valve body is further connected with a valve rod used for driving the small valve element to move, and a valve position indicator is installed on the valve rod.

The application discloses a kind of intelligent toilet flushing device, belongs to the technical field of bathroom supplies, including valve body, the inside of valve body is equipped with water inlet cavity and water outlet cavity, front end cover is combined with main valve module, the rear of valve body is equipped with rear end cover, and rear end cover is installed with stepper motor, and stepper motor's output shaft is connected with water distribution pivot, the side of valve body is equipped with mounting hole, and the installation hole is installed with pilot valve module, and the pilot valve module includes pilot valve cover and pilot valve swing rod, the rear end of pilot valve swing rod is equipped with water stop rubber sleeve, and the rear of water stop rubber sleeve is equipped with pilot valve spring.The sealing performance of this flushing device is high, the volume is reduced, and it is more convenient to install.The newly invented swing rod type pilot valve and water distribution block linkage mechanism are used to control the opening and closing of the main valve and the simultaneous flushing of the two water outlets, which is simple and ingenious, reliable in sealing, can reduce the failure rate of the flushing valve, and improve the use reliability of the intelligent toilet.

The application discloses a kind of main valve core flow, displacement, hydraulic force test system and test method, comprising: two displacement sensors, the balanced valve to be measured, hydraulic test component;The main valve core of the balanced valve to be measured and the pilot valve core are coaxially arranged oppositely;Two displacement sensors are respectively fixed with main valve core, control piston coaxially;Hydraulic test component detects the pressure of return oil outlet A, load oil port B, feedback spring cavity pressure measuring port Pc, pilot oil inlet X by each pressure sensor;And by main load, pilot control, three oil circuits of return oil back pressure, load pressure, pilot pressure and return oil back pressure are controlled respectively, while return oil flow is measured by flowmeter simultaneously.The application can synchronously dynamically measure the flow, displacement and hydraulic force of main valve core under different working conditions.

This application relates to a hydraulically controlled water supply on / off device and its control method. The device includes a pressure reducing valve, a pilot valve, and a solenoid valve. The solenoid valve is disposed on the connecting pipeline between the outlet side of the pilot valve and the outlet side of the pressure reducing valve. When the solenoid valve is open, the valve plate of the pressure reducing valve separates from the valve body under the pressure of the water at the inlet side of the pressure reducing valve, and the pressure reducing valve opens. When the solenoid valve is closed, the pilot valve controls the valve plate of the pressure reducing valve to move downward, and the pressure reducing valve closes. This device controls the opening and closing of the solenoid valve by receiving the unit's operating status signal to isolate or open the pilot valve channel, thereby automatically controlling the opening and closing of the pressure reducing valve using hydraulic action. This achieves reliable on / off control of the technical water supply system, effectively avoiding the opening and closing failures caused by pressure buildup in traditional electric isolation valves. Furthermore, by replacing the high-energy-consuming electric valve with a low-power solenoid valve, the system's energy consumption is significantly reduced.

This utility model discloses a steel ball valve core type pressure regulating assembly, including a lower housing, an upper housing, and a valve seat, as well as a high-pressure safety valve assembly, a low-pressure safety valve assembly, an anti-negative pressure safety valve assembly, a high-pressure safety valve spring, and a low-pressure safety valve spring mounted on the valve seat. The lower housing, upper housing, and valve seat are connected by screws. The lower housing has ports C and D as inlets, and the upper housing has ports A and B as outlets. The low-pressure safety valve assembly integrates a steel ball, valve seat 1, ball seat, pilot valve assembly, and pilot valve spring inside its cavity. When the aircraft tilts, it rotates the assembly, causing the steel ball to roll within the ball seat, controlling the opening and closing of the pilot valve assembly, thus regulating the opening pressure of the low-pressure safety valve. The assembly prevents oil leakage during aircraft nose-down, side-tilt, or nose-up flight. It features a compact structure, high integration, small size, and light weight.