951 results about "Directional Valve" patented technology

A pump system includes a housing defining a first internal volume and a second internal volume, a first piston positioned to separate the first internal volume into a first chamber and a second chamber, a second piston positioned to separate the second internal volume into a third chamber and a fourth chamber, a first inlet check valve configured to permit fluid flow into the first chamber, a second inlet check valve configured to permit fluid flow into the third chamber, a directional control valve (DCV) repositionable between (a) a first position where the DCV is configured to fluidly couple the second chamber to a high pressure fluid source and (b) a second position where the DCV is configured to fluidly couple the fourth chamber to the high pressure fluid source, and a relief valve configured to supply a fluid to the DCV through an orifice to move the DCV.

Disclosed is a hydraulic control system for safe rapid opening or closing of a valve. The hydraulic control system comprises a hydraulic cylinder (71), a pressure oil line (141), an oil return line (151), an oil drain line (161), a quick oil return line (171) and a valve manifold (181), wherein the inside of the valve manifold is provided with a three-position four-way directional control valve (51), a bidirectional hydraulic lock (31), a first two-position four-way directional control valve (61) and an energy accumulator (191); a first cartridge valve (101) is connected between the oil drain line and a rod cavity of the hydraulic cylinder, and a pilot port of the first cartridge valve is connected to a port A of the first two-position four-way valve; an oil inlet of the energy accumulator is connected to each of the pressure oil line and the oil return line, a first check valve (81) is connected between the oil inlet of the energy accumulator and the pressure oil line, and a second cartridge valve (102) is connected between the first check valve and the energy accumulator; and the second cartridge valve is connected to a rodless cavity of the hydraulic cylinder, and a pilot port of the second cartridge valve is connected to the port A of the first two-position four-way directional control valve. The hydraulic control system for safe rapid opening or closing of a valve allows for safe rapid opening or closing of a valve.

The invention discloses an unmanned mining dump truck hydraulic braking system and a control method. The unmanned mining dump truck hydraulic braking system comprises a service brake valve set and a parking brake valve set. The service brake valve group comprises a first hydraulic proportional pressure reducing valve, a second hydraulic proportional pressure reducing valve, a first shuttle valve and a first pressure sensor; the first hydraulic proportional pressure reducing valve and the second hydraulic proportional pressure reducing valve are connected in parallel; oil outlets of the first hydraulic proportional pressure reducing valve and the second hydraulic proportional pressure reducing valve are communicated with an oil inlet of a first shuttle valve; an oil outlet of the first shuttle valve is connected with a first pressure sensor; the parking brake valve group comprises an electromagnetic directional valve, a redundant electromagnetic directional valve and a pressure switch; the electromagnetic directional valve is a normally closed valve, and the redundant electromagnetic directional valve is a normally open valve; the electromagnetic directional valve and the redundant electromagnetic directional valve are connected in series, the electromagnetic directional valve is connected with an oil inlet pipeline, the redundant electromagnetic directional valve is connected with an oil outlet pipeline and a parking brake caliper, and a pressure switch is arranged on the oil outlet pipeline.

The invention relates to a hydraulic system for an iron roughneck. The hydraulic system comprises a hydraulic pump station, an electromagnetic directional valve group, a pilot pressure-reducing overflow valve and two upper shackle oil cylinders which are arranged in parallel, an oil supply port and an oil return port of the hydraulic pump station are communicated with corresponding oil ports of the electromagnetic directional valve set in a one-to-one correspondence mode, the electromagnetic directional valve set comprises a first working unit, the first working unit is provided with a first working oil port and a second working oil port, the first working oil port is communicated with rodless cavities of the two upper shackle oil cylinders, and the second working oil port is communicated with rodless cavities of the two lower shackle oil cylinders. Rod cavities of the two upper shackle oil cylinders are communicated with a port B of the pilot pressure reducing overflow valve, a port T of the pilot pressure reducing overflow valve is communicated with an oil tank of the hydraulic pump station, and a port A of the pilot pressure reducing overflow valve is communicated with the second working oil port. According to the iron roughneck hydraulic system, after the screwing pressure reaches the set pressure, low-pressure overflow is carried out through the pilot pressure reduction overflow valve, and therefore it can be guaranteed that a screw thread is screwed, and the screw thread can be prevented from being damaged.

The invention discloses a safety braking hydraulic system for a main elevator of a ship lift and a control method. The hydraulic system comprises an oil tank, a first motor pump set, a second motor pump set, a first high-pressure filter, a second high-pressure filter, a first one-way valve, a second one-way valve, a pressure gauge, a first pressure sensor, an energy accumulator, a stop valve, an oil return filter, a safety brake module and a working brake module. A safety brake loop is provided with a two-way cartridge valve and an electromagnetic directional valve, quick response and brake loosening and locking synchronization are achieved, a working brake loop is provided with an overflow valve and a proportional overflow valve, the proportional overflow valve, a PLC, a third pressure sensor and a speed encoder form a closed-loop system, the voltage of the proportional overflow valve is accurately adjusted according to oil pressure and speed, and the safety brake loop is controlled. The braking torque is timely controlled, stable braking is guaranteed, potential safety hazards such as poor synchronism and uncontrollable braking of a traditional hydraulic system can be eliminated, and safe operation of the main elevator is guaranteed.

The invention relates to a hydraulic system, method, and integrated valve block for a slewing mechanism, comprising a first and second cylinder. The rod cavity of the first cylinder connects to the rodless cavity of the second cylinder through the first oil circuit, first hydraulic control check valve, and fourth oil circuit. The rodless cavity of the first cylinder connects to the rod cavity of the second cylinder through the second oil circuit, second hydraulic control check valve, and third oil circuit. The first oil circuit is connected to the directional valve through the sixth oil circuit, and the second oil circuit is connected to the directional valve through the fifth oil circuit. The directional valve is connected to the hydraulic pump and oil tank. The first hydraulic control check valve is installed between the first and fourth oil circuits, and the second hydraulic control check valve is between the second and third oil circuits. The check valves' control circuits connect to the sixth oil circuit, ensuring braking stability of the slewing mechanism.

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.

A dynamic testing system includes a test station and at least one controller. The test station includes a hydraulic actuator configured to drive an actuation of a test subject using a hydraulic fluid flow, and a control valve that includes a housing, a valve body contained within the housing having a position that controls a flow rate and direction of the hydraulic fluid flow, a valve body driver configured to adjust the position of the valve body based on a reference signal, and a valve position sensor configured to output a position signal that is indicative of the position of the valve body. The at least one controller is configured to obtain a current position of the valve body using the position signal, obtain a diagnostic reference, detect a diagnostic condition based on a difference between the current position and the diagnostic reference, and generate a diagnostic signal.

A bi-directional valve with valve elements having compliant features biasing them together to maintain a sealing interface that defines a fluid communication barrier within the valve. Parting the valve elements from one another removes the sealing interface allow fluid communication across the valve elements. The valve includes a side port and a choke member that selectively blocks fluid flow through the valve when moved adjacent the side port and selectively opens the valve to fluid communication when moved away from the side port. The choke member remains adjacent the side port until the valve elements are spaced a distance apart greater than that at which valve erosion or fluid cavitation occurs. Also included with the valve are systems for counterbalancing forces exerted onto the valve from differential pressures.

The invention discloses a radial plunger hydraulic device and method for controlling flow distribution based on pilot reversing valves. The radial plunger hydraulic device comprises a shell, plunger assemblies arranged around the shell, an eccentric main shaft rotationally arranged on the shell, a high-pressure total port, a low-pressure total port and the pilot two-position three-way reversing valves, wherein the high-pressure total port and the low-pressure total port are formed in one side of the shell, and the pilot two-position three-way reversing valves correspond to the plunger assemblies one to one. A plunger cavity, an eccentric main shaft cavity, a shell high-pressure oil way, a shell low-pressure oil way and a shell working oil way are arranged in the shell; plunger assemblies are arranged in the plunger cavities, and the plunger assemblies are arranged in the corresponding plunger cavities in an up-down sliding mode; the eccentric main shaft is rotationally mounted in the eccentric main shaft cavity and is in transmission connection with all the plunger assemblies; the high-pressure oil paths in the shell are communicated with one another and are communicated with the high-pressure main port; the low-pressure oil way of the shell is communicated with each other in the shell and is communicated with the low-pressure main port, and the two-position three-way reversing valve is matched with the conduction of the high-pressure oil way and the low-pressure oil way in the shell to realize the bidirectional rotation of the radial plunger hydraulic device.

The invention relates to the technical field of electromagnetic directional valve control, and discloses an electromagnetic directional valve remote control system and a data processing method, and the system comprises a control instruction receiving and analyzing module, a dynamic response parameter determining module, a state data collecting and uploading module, a state data analyzing module and a control signal executing module. The method comprises the following steps: receiving a remote terminal reversing control instruction, and analyzing the instruction into adjustment parameters such as action times, switching directions and pressure thresholds; determining dynamic response parameters of a control node based on the parameters, executing adjustment, and collecting state data such as current and magnetic flux; uploading the data to an edge calculation unit, and generating a pulse width modulation correction value of the first control node through data fusion, frequency domain correlation analysis, wavelet domain dynamic compensation aggregation and other processing; and the parameters are transmitted to the fuzzy controller to calibrate the driving circuit parameters. The method improves the remote control precision and stability, and is suitable for industrial automatic intelligent control.

The utility model discloses an isostatic press lower end cover four oil cylinder synchronous lifting device, four corners of a tool platform are respectively provided with an oil cylinder, four corners of the tool platform are respectively provided with an installation groove, an installation adjusting seat is installed in the installation groove, and one end of each oil cylinder extends into the installation groove and is connected with the installation adjusting seat. The mounting adjusting seat comprises a lifting table, a spring and an electromagnetic mechanism which are sequentially arranged from top to bottom, a magnet layer is arranged on the side, close to the electromagnetic mechanism, of the lifting table, the other side of the lifting table is connected with an oil cylinder, and the lifting table is slidably connected with the mounting groove; a rod cavity and a rodless cavity of the oil cylinder are connected with an oil inlet way and an oil return way respectively, the oil inlet way and the oil return way are connected with the proportional directional valve through hydraulic control one-way valves respectively, and a one-way balance valve is arranged at the end, close to the oil cylinder, of the oil return way. In an initial state, the displacement values of the four oil cylinders are corrected and adjusted by installing the adjusting seat; in the lifting process, the moving speed of the four oil cylinders is adjusted through the proportional reversing valves, synchronous and stable lifting of the lower end cover is achieved, and good practicability is achieved.

The utility model relates to the field of hydraulic servo systems, and discloses a safety valve group for a hydraulic servo system, which comprises a valve block and is characterized in that a servo valve is mounted on the upper surface of the valve block, and a first fully-adjustable throttle valve is mounted on the upper surface of the valve block close to the left end of the servo valve. A second full-adjustment type throttling valve is installed at the position, close to the right end of the servo valve, of the upper surface of the valve block, an electromagnetic direction valve is installed on the upper surface of the valve block, a first balance type normally-open logic valve is installed on the left surface of the valve block, and a first balance type normally-closed logic valve is installed on the left surface of the valve block. And a second balance type normally-closed logic valve is mounted on the right surface of the valve block. According to the utility model, by adopting a new oil way design, the whole device has the advantages of simple structure, small valve body size, safety, reliability and the like, and meanwhile, the whole device can take pressure relief protection measures on a system in time according to working conditions, so that the safety of system equipment and operators is guaranteed.

The utility model discloses a hydraulic control system, which relates to the technical field of hydraulic control and comprises an oil tank, a hydraulic pump, a main cylinder, a first electromagnetic plug-in mounting direction valve, a second electromagnetic plug-in mounting direction valve and a third electromagnetic plug-in mounting direction valve. The main oil supply path is communicated with a rapid cavity of the main cylinder through a first electromagnetic plug-in mounting direction valve, the main oil supply path is communicated with a lower cavity of the main cylinder through a second electromagnetic plug-in mounting direction valve, the main oil supply path is communicated with an upper cavity of the main cylinder through a third electromagnetic plug-in mounting direction valve, and the upper cavity, the lower cavity and the rapid cavity of the main cylinder are all communicated with an oil tank through an oil return path; sliding valve control of a conventional hydraulic machine is replaced by cartridge valve control, the hydraulic machine is simple in structure and stable in performance, can be widely applied to the fields of game coins, souvenir medal, medal and the like, brings considerable benefits, and can adjust the drift diameter of corresponding cartridge valve combination parts according to actual conditions so as to improve the application range.

The invention discloses an unmanned mine car front and rear wheel synchronous steering system which comprises a car frame, a front steering axle and a rear steering axle, and the front steering axle and the rear steering axle are installed on a car and control steering through a steering system. The steering system comprises a front axle working cylinder, a front axle driven cylinder, a rear axle working cylinder and a rear axle driven cylinder, the front axle working cylinder and the front axle driven cylinder control front wheels of a vehicle to rotate, the rear axle working cylinder and the rear axle driven cylinder control rear wheels of the vehicle to rotate, and cavities of the front axle working cylinder and the rear axle working cylinder are communicated with a working port A and a working port B of a three-position four-way reversing valve through pipelines respectively. Cavities of the front axle driven cylinder and the rear axle driven cylinder are communicated through a valveless rigid connecting pipeline to form a rigid series oil way, and in the rigid series oil way, the amount of oil discharged by the front wheel working cylinder and the front axle driven cylinder is equal to the amount of oil received by the rear wheel working cylinder and the rear axle driven cylinder. Mechanical hydraulic synchronization of steering angles of front and rear wheels of the vehicle is realized, delay and fault risks of dependence on sensors are eliminated, and high-reliability rigid synchronization is realized.

The invention relates to the technical field of valves, and discloses a two-position four-way reversing valve which comprises a double-spliced valve body and a hydraulic pushing device. Two hydraulic cavities which are communicated with each other are formed in the double-spliced valve body, a valve element is arranged in each hydraulic cavity, and a through hole which extends axially is formed in each valve element; a liquid inlet, a liquid return opening and a liquid outlet which are communicated with the hydraulic cavity are formed in the double-spliced valve body; the valve element is sleeved with a valve sleeve, a first flow channel is formed in the position, opposite to the liquid inlet, of the valve sleeve, and a second flow channel is formed in the position, opposite to the liquid return opening, of the valve sleeve. By arranging the valve sleeve outside the valve element, inlet and outlet liquid can flow through the first flow channel or the second flow channel firstly, so that the effective flow area of high-pressure liquid entering the cavity of the double-spliced valve body from the liquid inlet is remarkably increased, and the flow of the inlet and outlet liquid is remarkably increased; and the reliability and the response speed of position switching of the valve element in the valve cavity are ensured.

The application provides a two-position five-way pneumatic reversing valve, and relates to the technical field of hydraulic control valves.The valve body is provided with a first air outlet hole, an air hole and a second air outlet hole from left to right on the lower side, and the inner cavity of the valve body is provided with a valve core.The left end of the valve body is provided with a front baffle, and the right side of the valve body is provided with a piston assembly, which is in contact with the right end surface of the valve core.The valve body is provided with a first annular protrusion, a second annular protrusion, a third annular protrusion, a fourth annular protrusion and a fifth annular protrusion corresponding to each hole.The outer side of the air hole is provided with a plug A, and the air hole is connected with the piston assembly through a pipeline arranged in the valve body.The pipeline is internally provided with a plug B.The electromagnetic structure of the application is integrated, and the parts have better coaxiality during production and assembly, effectively ensuring the service life of the product and the extremely low product failure rate.Compared with the existing split structure, the application has higher electromagnetic conversion efficiency and can effectively reduce the power consumption of the product.

The invention discloses a shallow sea self-sinking and floating type section buoy based on a flexible solar material and a method thereof. The shallow sea self-sinking and floating type section buoy comprises a detection unit, and the detection unit comprises a shell assembly, a sensing assembly arranged at the top of the shell assembly, a hydraulic system arranged in the shell assembly and a control assembly arranged in the shell assembly; the hydraulic system comprises an inner oil bag, an outer oil bag, a first two-position two-way electromagnetic directional valve connected with the inner oil bag through a pipeline and a second two-position two-way electromagnetic directional valve connected with the inner oil bag through a pipeline, and the first two-position two-way electromagnetic directional valve is connected with a third two-position two-way electromagnetic directional valve. Efficient collection of solar energy is achieved, the gravity center of the buoy is adjusted by rotating the position of the mass block, so that the posture of the buoy is changed, the buoy body of the buoy rotates by 90 degrees and transversely floats on the sea surface, the influence of sea surface stormy waves on the buoy body is reduced, and the service life of the buoy is prolonged. And the daylighting area of the buoy body exposed out of the water surface is larger.

The utility model discloses a double-coil two-position four-way electromagnetic directional valve which comprises a valve element, a limiting sleeve, a first coil control part, a second coil control part and a valve body. The valve element is arranged in a valve sleeve hole in the valve body in a left-right sliding mode, the limiting sleeve is arranged in the valve sleeve hole and attached to the inner surface of the valve sleeve hole so as to limit the valve element to be located at the first position or the second position, and then the valve element and a corresponding oil hole in the valve body are communicated or blocked. The first coil control part is arranged at the end of the valve body and is in driving connection with the valve element. The second coil control part and the first coil control part are arranged at the end of the valve body in series and are in driving connection with the valve element. When the first coil control part or the second coil control part is powered on, the valve element is driven to move to the corresponding first position or the second position so as to conduct oil way switching. The service life of the reversing valve can be prolonged, and the use energy consumption can be reduced.

The utility model discloses a control system of a transverse skin stretching pitching mechanism, which belongs to the technical field of skin stretching hydraulic machines and comprises a proportional servo valve, one end of the proportional servo valve is communicated with an oil tank, and the other end of the proportional servo valve is communicated with a counterbalance element. A check element is arranged between the proportional servo valve and the counterbalance element, one side of the check element is communicated with an electromagnetic reversing valve, the electromagnetic reversing valve is communicated with an oil tank, the counterbalance element is respectively communicated with a safety valve and a leak-free valve, one side of the leak-free valve is communicated with a supporting valve, and the supporting valve is communicated with the oil tank. A pressure sensing element and a shock-proof sensing element are further installed on one side of the counterbalance element, three stretch forming processes are provided for a pitching mechanism of the transverse skin stretch hydraulic press, and the use requirements of users for high efficiency and high quality are met.

A directional control valve provided with a plurality of external flow channel ports for fluid entry and exit. A flow channel switching assembly is further arranged inside the directional control valve and configured to provide different internal flow channels in different switching positions, so as to connect different external flow channel ports. The flow channel switching assembly comprises: a movable valve member (121), which is provided with a plurality of movable valve member flow channels (1211), wherein at least one movable valve member flow channel penetrates the body of the movable valve member and connects different external flow channel ports located on two sides of the movable valve member; and a fixed valve member (122), which is provided with a plurality of fixed valve member flow channels, wherein the movable valve member abuts against the fixed valve member; the movable valve member can be driven to rotate around a first axis to switch positions; and in the different switching positions, different movable valve member flow channels and fixed valve member flow channels form different internal flow channels so as to connect different external flow channel ports.

The utility model relates to the technical field of hydraulic pressure, in particular to a reversing valve. A reversing valve comprises a valve body, and a pressure oil duct, two working oil ducts and an oil return duct are arranged in the valve body; the valve core is assembled in the valve body in a sliding manner; the load holding valve is arranged aiming at the working oil duct, the load holding valve comprises a load holding cavity, and the load holding cavity is communicated with a valve core through an internal oil duct; the valve element controls connection and disconnection between the oil channels, and when the valve element is located at the middle position, the oil channels are not communicated with one another. When the valve element is located at the two working positions, the valve element controls one working oil duct to be communicated with the pressure oil duct, and the other working oil duct to be communicated with the oil return oil duct. When the valve element is located at the floating position, the valve element controls the two working oil channels, and the inner oil channel is communicated with the oil return channel. The technical problems that in the prior art, a reversing valve cannot give consideration to the load keeping function and the floating function, and use is limited are solved.

A controller of a work machine computes a requested velocity of a hydraulic actuator based on an operation signal, computes a first estimated velocity of the hydraulic actuator based on a sensed value of a first sensing device that senses motion information of a driven member, computes a second estimated velocity of the hydraulic actuator based on a sensed value of a second sensing device that senses a flow rate of a directional control valve, computes an arbitrated velocity by arbitrating the first estimated velocity and the second estimated velocity according to a driving state of the hydraulic actuator, and controls the directional control valve based on a deviation between the requested velocity and the arbitrated velocity. The computation of the arbitrated velocity is to perform an arbitration such that a degree of effect on the second estimated velocity is larger than a degree of effect on the first estimated velocity when the hydraulic actuator starts to move, and to perform an arbitration such that the degree of effect on the first estimated velocity is larger than the degree of effect on the second estimated velocity when the driving of the hydraulic actuator is approaching a steady state.

The invention provides a hydraulic system based on a CFA working condition and an operation method thereof.The hydraulic system comprises a pilot pump, a control valve, a first electromagnetic reversing valve, a second electromagnetic reversing valve, a first hydraulic control proportional valve and a second hydraulic control proportional valve; the other end of the control valve is connected with a first electromagnetic directional valve and a second electromagnetic directional valve, the first electromagnetic directional valve is connected with a first hydraulic control proportional valve through a first pipeline, and the second electromagnetic directional valve is connected with a second hydraulic control proportional valve through a second pipeline. The first pipeline and the second pipeline are respectively communicated with the control valve, and pilot oil passing through the control valve can simultaneously control the first hydraulic control proportional valve and the second hydraulic control proportional valve. The hydraulic system is simple in program, the drill rod and the power head can synchronously ascend through a common hydraulic valve, feedback control is prevented from being added, the hydraulic system is simple and reliable, and the operation difficulty is reduced. The invention further relates to the rotary drilling rig.

The utility model discloses a control device capable of adjusting hanging height through flow. The control device comprises a posture controller, a hanging control box, a flow meter, a stop valve and a hanging executing mechanism. The suspension actuating mechanism comprises a pneumoelectric valve, an electromagnetic directional valve, a power cylinder and a pressure accumulator, the high-pressure air source is connected with the power cylinder through the pneumoelectric valve, the hydraulic source is connected with the power cylinder after sequentially passing through the electromagnetic directional valve, the stop valve, the flowmeter and the pressure accumulator, and the posture controller is electrically connected with the pneumoelectric valve, the electromagnetic directional valve and the suspension control box. The suspension control box is electrically connected with the stop valve and the flow valve. The suspension device of the special vehicle solves the problem that a driver is inconvenient to operate when the vehicle normally lands ashore or lands a naval vessel due to the fact that the suspension device of the existing special vehicle cannot feed back position information during adjustment, and the use safety is improved; meanwhile, preset height adjustment of the vehicle suspension device is achieved, then preset adjustment of the distance between the vehicle bottom and the ground is achieved, and the operation difficulty of a driver is lowered.

The invention provides a coal mill oil way plate and a reversing control device thereof, and relates to the technical field of coal mill oil way plates, the coal mill oil way plate comprises a valve block body, a proportional overflow valve, a duplex electromagnetic reversing valve group, a working oil way group, two hydraulic control one-way valve groups, two energy accumulators, a safety overflow valve, an online particle counter and a spiral cooling flow channel. The redundancy design of the duplex electromagnetic directional valve group improves the reliability of the system, so that the system can still be operated when a single valve fails, the hydraulic control one-way valve group realizes mechanical locking of an oil cylinder and can prevent a grinding roller from falling off during power failure, and the energy accumulator is connected with a working oil duct through a connector to absorb pressure impact and compensate leakage, so that the stability of loading pressure is maintained, and the reliability of the system is improved. The on-line particle counter gives an early warning of oil pollution in real time, hydraulic faults can be reduced, the spiral cooling flow channel is matched with the semiconductor temperature control piece to adjust the oil temperature, and the problem of pressure drift caused by oil viscosity fluctuation under high and low temperature working conditions is solved.

The utility model relates to the technical field of fluid control, in particular to a reversing valve. The reversing valve comprises a valve body and a valve element, the valve body is provided with a valve cavity and a plurality of valve holes, the valve holes are distributed along the circumferential side of the valve cavity at intervals and communicated with the valve cavity, and the valve element is rotatably installed in the valve cavity and used for being communicated with the different valve holes. In the radial direction of the valve element, the side wall of the valve element and the inner wall of the valve cavity are arranged at intervals to form impurity discharging gaps. In addition, in the axial direction of the valve element, the end face of the valve element and the inner wall of the valve cavity are arranged at intervals to form impurity containing spaces, and the impurity containing spaces communicate with the impurity discharging gap. According to the reversing valve, the problem that after an existing reversing valve is used for a long time, impurities easily enter the space between the valve element and the valve body, and consequently the valve element is stuck is solved.

The present invention discloses a control valve and hydraulic system for distributed drive, wherein the control valve includes: a plurality of valve plates connected in sequence, each valve plate includes a three-position six-way directional valve, a first one-way valve, a second one-way valve, a pressure compensating valve, a series-parallel selection valve, a PA oil circuit, a PB oil circuit, and an LS oil circuit. The first working oil port of the series-parallel selection valve is connected to the oil port B of the three-position six-way directional valve, the second working oil port is connected to the three-position six-way directional valve of the adjacent valve plate, the third working oil port is connected to the second oil port, and the fourth working oil port is connected to the first oil port of the adjacent valve plate. The PA oil circuit and PB oil circuit of the control valve can withstand high-pressure alternating oil inlet and return, and the oil flows in both directions. The pressure compensating valve in the valve plate can perform post-valve pressure compensation control on any oil inlet. In addition, the control valve is also equipped with a series-parallel selection valve, which can realize the series, parallel, and mixed switching of the motor as needed.

The invention discloses a winch hydraulic system based on moment balance and a crane. The system comprises an energy accumulator pressure supplementing system, and the energy accumulator pressure supplementing system comprises a hydraulic control one-way valve, an energy accumulator, a two-position two-way electromagnetic reversing valve, a force limiter and a pressure sensor; an outlet of the hydraulic control one-way valve is connected with the energy accumulator, and an inlet of the hydraulic control one-way valve is connected to an oil channel of the motor starting opening containing cavity between the motor starting opening B and the winch balance valve. The pressure sensor is connected with the pilot handle and the force limiter. The pressure sensor is used for collecting the pressure of the pilot handle and sending the pressure to the force limiter. The force limiter is connected with an electromagnetic coil of the two-position two-way electromagnetic directional valve, and the two-position two-way electromagnetic directional valve is connected with a control oil port of the hydraulic control one-way valve. The problems of pressure impact, vibration, abnormal sound and the like occurring in the heavy-load starting working condition of the hoisting mechanism can be solved, the heavy-load starting action smoothness of a hoisting system is improved, and the operation comfort is improved.