142 results about "Shuttle valve" patented technology

The invention provides an impact rotary drilling hydraulic control system of a dinting machine, which belongs to the technical field of hydraulic control systems and comprises a variable pump, a pilot oil source control valve group, a proportional multi-way valve, a shuttle valve I, a one-way pressure reducing valve, a shuttle valve II, a drilling machine pilot handle group, an impact rotary drilling machine, a bidirectional hydraulic lock and a drilling machine feeding oil cylinder. According to the hydraulic control system for percussive rotary drilling of the dinting machine, the percussive rotary drilling machine can perform stepless speed regulation between two speeds, high-frequency percussive or low-frequency percussive operation can be flexibly used according to rock stratum and geological working conditions, the application range of equipment is greatly widened, and the hydraulic control system can be used for rock stratums with high hardness, weathered rock stratums and hard and brittle geology. And during low-frequency impact operation, one-key linkage operation can be realized, namely, the functions of feeding, rotating and impacting of the drilling machine can be completed by operating the impact pilot handle.

The utility model relates to the technical field of hydraulic systems, in particular to an oil return compensation multi-way output hydraulic system for a tractor and the tractor, the input end of a main pump is communicated with a hydraulic oil tank, the output end of the main pump is connected with a port P of a multi-way output valve through a pipeline, and a plurality of valve assemblies are arranged in the multi-way output valve; the valve assembly is connected with a pressure feedback channel of the multi-way output valve through a shuttle valve, an oil return opening of the valve assembly is connected with an oil inlet of the pressure compensation valve through a pipeline, an oil return opening of the pressure compensation valve is communicated with the hydraulic oil tank through an oil return pipe, and an oil outlet of the shuttle valve conveys screened load pressure to a non-spring side control cavity of the pressure compensation valve. A load sensitive oil port of the valve assembly is connected with a spring side control cavity of the pressure compensation valve through a load feedback oil way. According to the utility model, multiple loads can work at the same time, and the opening of the pressure compensation valve is reduced through the screening of the shuttle valve, so that the balance of each load is obtained, and the adaptability, comfort and safety of the tractor and an executive component are higher.

The invention belongs to the technical field of engineering machinery, and discloses a brake hydraulic system and engineering machinery. According to the brake hydraulic system, service braking is adopted, reliable braking force can be provided, the two service brake valves and the electric proportional brake valve are connected in parallel, the path with the largest oil pressure is supplied to the service brake oil cylinder after judgment is conducted through the first shuttle valve and the second shuttle valve, and the service brake oil cylinder is connected with the electric proportional brake valve. Automatic signals and active operation of a driver can be perfectly coordinated, conflicts are avoided, and the system is simple and high in reliability.

The application discloses a multi-stage priority liquid filling valve and belongs to the technical field of hydraulic control valves of engineering vehicles.The valve adopts a modularized superposition structure, is composed of a liquid filling valve part and a steering priority valve part which are superposed upward and downward, is communicated through three internal oil channels, integrates a main overflow valve, a steering priority valve, a liquid filling priority valve, a liquid filling pressure regulating valve, a throttling check valve and a shuttle valve, realizes three-stage hydraulic oil supply control of steering highest priority, brake liquid filling secondary priority and working system lowest priority, and is provided with the main overflow valve at an oil inlet to realize system overpressure protection.The problems of complex priority control, incompatible load sensing and constant flow systems of valve parts, need of external main overflow valve, low universality, high development and use costs and the like are solved when a single pump source supplies oil to three or more systems.

The invention discloses a dual-mode redundancy brake-by-wire system, and relates to the technical field of vehicle braking and safety control. The dual-mode redundancy brake-by-wire system is characterized in that the oil outlet end of an oil supply pipeline is communicated with a first reversing valve; a control oil path of the driving pressure control mechanism comprises a first pressure control oil path and a second pressure control oil path, a proportional pressure reducing valve is arranged on the first pressure control oil path, and an oil outlet end of the first pressure control oil path is communicated to an oil inlet of a shuttle valve and is communicated to a corresponding driving brake through the shuttle valve; the second pressure control oil way is provided with an oil inlet pipeline and an oil drainage pipeline, an oil inlet switch valve is arranged on the oil inlet pipeline, an oil return switch valve is arranged on the oil drainage pipeline, and the oil inlet end of the oil drainage pipeline and the oil outlet end of the oil inlet pipeline are connected to the other oil inlet of the shuttle valve in parallel and communicated to the corresponding service brake through the shuttle valve. The device is used for braking and ABS sliding control under the working conditions of low attachment, heavy load and the like in an underground coal mine, and it is guaranteed that fault operation can be achieved, and safety and reliability are achieved.

An active compensation hydraulic system for a crane includes a controller, a hydraulic pump assembly, a high-frequency response valve control assembly, a proportional control valve assembly, a first locking valve assembly, a second locking valve assembly, a control mode switching valve assembly, and an actuator. The high-frequency response valve control assembly includes a one-way solenoid ball valve, a high-frequency response valve, and a first bidirectional solenoid ball valve. The proportional control valve assembly includes a proportional directional valve and a second bidirectional solenoid ball valve. The first locking valve assembly includes a first two-way cartridge valve and a first balancing valve. The second locking valve assembly includes a second two-way cartridge valve, a second balancing valve, a first shuttle valve, and a first hydraulically controlled directional valve. The control mode switching valve assembly includes a first solenoid directional valve and a second solenoid directional valve. This system features a high-precision active compensation control mode and a simple and reliable proportional control mode, which can be switched between each other, resulting in high system safety and reliability.

The invention provides a load self-adaptive constant tension winch control system, which comprises a PLC (Programmable Logic Controller), a hydraulic motor, a hydraulic winch, a winch steel wire rope, a fixed pulley, a working boat, a rotary encoder, a shaft pin type sensor and a constant tension loop consisting of three loops, and is characterized in that the first loop comprises a preset oil tank, a main control valve and the hydraulic motor; the second loop comprises a preset oil tank, a main control valve, a shuttle valve, a pressure reducing valve, a hydraulic control reversing valve and a hydraulic brake; the third loop comprises a shuttle valve, an electromagnetic switch valve, a hydraulic control switch valve, an electric proportional overflow valve and a hydraulic motor, the system controls the electromagnetic switch valve and the electric proportional overflow valve at the same time through the PLC according to detection data of the rotary encoder and the shaft pin type sensor, accurate control over the tension of the winch steel wire rope is achieved, and when waves rise, the winch steel wire rope is driven to rotate. The system controls the hydraulic winch to actively lift; and when the waves descend, the system controls the hydraulic winch to descend passively, so that the tension of the winch wire rope is always kept within a preset range, and stable operation of the working boat is ensured.

The application provides a hydraulic control system for impact rotary drilling of a bedding machine, and belongs to the technical field of hydraulic control systems, and comprises a variable pump, a pilot oil source control valve group, a proportional multi-way valve, a shuttle valve I, a one-way pressure reducing valve, a shuttle valve II, a drilling machine pilot handle group, an impact rotary drilling machine, a bidirectional hydraulic lock and a drilling machine feeding oil cylinder. Through the hydraulic control system for impact rotary drilling of the bedding machine, the impact rotary drilling machine can be infinitely adjusted between double speeds, high-frequency impact or low-frequency impact operation can be flexibly used according to rock strata and geological conditions, the use range of the equipment is greatly improved, and the hydraulic control system can be used for high-hardness rock strata, weathered rock strata and hard and brittle geology. When low-frequency impact operation is performed, one-key linkage operation can be realized, that is, the drilling machine feeding, rotation and impact functions can be completed by operating the impact pilot handle.

The invention belongs to the technical field of monorail crane oil temperature control, and particularly relates to a distributed oil temperature control system and method suitable for a monorail crane. An oil suction port of the variable hydraulic pump is connected with a hydraulic oil tank; an inlet of the high-pressure filter is connected with an oil outlet of the variable hydraulic pump; the heat dissipation part is connected to an outlet oil way of the high-pressure filter in series; the pilot control oil way comprises a pilot overflow valve group, a temperature control valve group and a shuttle valve; a P port of the pilot overflow valve group is connected with an oil outlet of the high-pressure filter, and an A port of the pilot overflow valve group is connected with an outlet of the heat dissipation part; a port P of the temperature control valve group is connected with a control oil outlet of the pilot overflow valve group, and a port T of the temperature control valve group is connected with a hydraulic oil tank and used for sensing system oil temperature; a port A of the shuttle valve is connected with an outlet of the temperature control valve set, and a port R of the shuttle valve is connected with a port X of the volume adjustable hydraulic pump. The temperature control valve set is arranged to adjust pilot control oil pressure according to oil temperature changes, the displacement of the volume adjustable hydraulic pump is controlled through the shuttle valve, and self-adaptive control over the rotating speed of the cooling fan is achieved.

The application relates to a multi-mode brake system of a special vehicle, which comprises an emergency relay valve, a first relay valve, a second relay valve, an ABS controller, a foot brake valve, a hand brake valve, a normally open electromagnetic valve, a normally closed electromagnetic valve, an electric control proportional valve, a first shuttle valve, a second shuttle valve, a third shuttle valve, an air compressor and a plurality of brake chambers. The application can realize various modes of braking, two-by-two interlocking, automatic switching according to the walking mode of the vehicle, satisfy the overall brake system, can not only guarantee traction braking, but also does not affect the braking work when the vehicle independently walks; and is reasonably designed, can satisfy the integrated brake system of a vehicle under various walking mode states, is complete in function and improves work efficiency.

The invention provides a redundant oil supply control valve bank, a redundant oil supply system and an underwater control module, the redundant oil supply control valve bank comprises a shuttle valve and two electro-hydraulic composite control valves, the two electro-hydraulic composite control valves are arranged at two oil inlets of the shuttle valve respectively, the two electro-hydraulic composite control valves can be conducted at the same time through a control system, and therefore the redundant oil supply control valve bank can be used for controlling the underwater control module. A hydraulic oil supply system is communicated with two oil inlets of the shuttle valve at the same time, and at the moment, hydraulic oil of one path with large pressure can be passively selected to supply oil through the shuttle valve by means of pressure difference. In addition, the control system can selectively conduct one electro-hydraulic composite control valve and close the other electro-hydraulic composite control valve, and therefore one path of hydraulic oil can be manually assigned to be supplied. According to the redundant oil supply control valve set, the problems that in the related technology, oil supply paths are passively selected only depending on the hydraulic pressure difference, long-term overload loss of one path is caused, long-term idle aging of the other path is caused, and the reliability of system redundancy design is weakened are solved.

A kind of composite brake system, including pump source, first electromagnetic valve, parking brake, brake foot valve group, second electromagnetic valve, wheel brake, shuttle valve and control switch;Pump source forms first liquid filling oil path between first electromagnetic valve and parking brake, pump source forms second liquid filling oil path between brake foot valve group and wheel brake, and third liquid filling oil path is connected between the oil input end and the oil output end of brake foot valve group, and third liquid filling oil path is also connected with a second electromagnetic valve;Second liquid filling oil path is located at the oil output end of brake foot valve group and the input end of third liquid filling oil path that flows into wheel brake forms an oil path intersection, a shuttle valve is arranged in the oil path intersection, and the oil pressure of third liquid filling oil path is greater than the oil pressure of second liquid filling oil path at the oil output end of brake foot valve group;Control switch is used to control the break-on of first electromagnetic valve and the break-off of second electromagnetic valve, so that parking brake and the oil pressure applied from third liquid filling oil path are synchronized to realize wheel brake.

The low-temperature environment hydraulic oil temperature control system comprises a pump group, a winch reversing valve group, an oil tank, a main pump group, a temperature control pump group, a two-motor and displacement adjusting oil cylinder; the oil outlet of the oil tank is communicated with the oil inlet of the main pump group, the oil outlet of the main pump group is communicated with the oil inlet of the oil tank, the oil outlet of the main pump group is communicated with the oil inlet of a filter, the oil outlet of the filter is communicated with the oil inlet of a one-way valve, the oil outlet of the one-way valve is communicated with the P port of the pump group, and the P port of the pump group is communicated with the P port of the winch reversing valve group; the winch reversing valve group comprises a pressure reducing valve, two overflow valves, a proportional reversing valve and a shuttle valve, and the oil outlet of the main pump group is communicated with the oil inlet of the pressure reducing valve. In the working phase of the actuator, the hydraulic oil temperature can be dynamically adjusted through the proportional overflow valve, the hydraulic oil is guaranteed to work at the optimal temperature, the temperature of the oil tank is accurately controlled, and the working efficiency is improved.

The utility model discloses a kind of electrical double control brake systems of remote control loader, it belongs to engineering machinery technical field.It solves the defect that human driving control cannot adapt to narrow space operation, operation under dangerous environment in the conventional loader braking of prior art.Its main structure includes air source assembly, air source assembly is connected with parking component and control component respectively, control component is also connected with the execution component for controlling vehicle brake, control component includes gas brake valve, relay valve, proportional solenoid valve and shuttle valve, the air outlet of air source assembly is connected with gas brake valve, relay valve and proportional solenoid valve respectively, gas brake valve is connected in parallel with relay valve, and the two air inlets of shuttle valve are connected with gas brake valve and relay valve respectively, the signal end of relay valve is also connected with proportional solenoid valve.The utility model is mainly used on loader and other engineering machinery.

This application relates to a redundant hydraulic braking system and control method for vehicles. The integrated parking and service brakes are located at the wheel ends and have parking brake chambers and service brake chambers. The hydraulic oil supply unit includes an oil tank, a motor pump, and an accumulator. The parking brake unit includes a handbrake solenoid valve, and the service brake unit includes a brake pedal, an angular displacement sensor, a pedal valve, an electro-hydraulic proportional valve, and a shuttle valve. The angular displacement sensor is used to collect the brake pedal travel signal. The controller is electrically connected to the angular displacement sensor and each electro-hydraulic proportional valve, and is used to control the output pressure of the electro-hydraulic proportional valve based on the brake pedal travel signal or an external braking signal. The mechanical pedal circuit and the electronically controlled proportional valve circuit are completely independent; even if one circuit fails, normal braking can still be performed, meeting the stringent safety requirements of special vehicles. The short-stroke braking system uses pure electronic control, eliminating the initial free travel of the mechanical pedal, eliminating mechanical dead zones, and is compatible with both manned and unmanned modes. One system simultaneously supports driver pedal operation and remote drive-by-wire commands.

The application relates to the technical field of digital construction equipment, in particular to a valve group for a digital construction bulldozer, which is characterized in that a valve body mounting plate is provided with a shuttle valve for automatic switching of an oil circuit, the valve body mounting plate is connected and fixed to the digital construction bulldozer through bolts, an electric proportional pressure reducing valve group is fixed on the valve body mounting plate, the electric proportional pressure reducing valve group is connected with the shuttle valve, and is used for receiving signals transmitted by the digital bulldozer and automatically adjusting hydraulic pressure. The application has the effect that the digital construction bulldozer can be conveniently controlled when being remotely controlled.

The utility model relates to a steering control system of an explosion-proof rubber-tyred vehicle, which belongs to the technical field of steering systems and particularly comprises a hydraulic oil tank connected with a variable displacement piston pump, an oil outlet of the variable displacement piston pump is connected with a high-pressure filter, an oil outlet of the high-pressure filter is connected with a proportional multi-way valve through a first pipeline, and the proportional multi-way valve is connected with a second pipeline. The proportional multi-way valve is connected with a first pipeline and is connected with a flow amplifier through a second pipeline, the flow amplifier is connected with a steering gear, an EF port of the flow amplifier is connected with a prefill valve, the flow amplifier, the steering gear, the proportional multi-way valve and the prefill valve are respectively provided with a pressure feedback port, and the pressure feedback ports are respectively connected with a shuttle valve through feedback pipelines. The hydraulic steering device has the advantages that the structural design is reasonable, and the hydraulic oil pressure of the steering device can be preferentially guaranteed when the hydraulic steering device walks.

The present application relates to a kind of tracked lifting chassis hydraulic system and its leveling method, including hydraulic oil tank, load sensing system, two-position four-way reversing valve, leveling hydraulic system and adjusting ram group;The hydraulic oil tank is connected with load sensing system, load sensing system is connected with leveling hydraulic system by two-position four-way reversing valve, and leveling hydraulic system and adjusting ram group are connected;The leveling hydraulic system includes several groups of sub-leveling hydraulic system, and sub-leveling hydraulic system includes pressure reducing valve, three-position four-way electromagnetic proportional valve, two check valves and shuttle valve.The leveling hydraulic system according to the present application changes the oil intake of each sub-leveling hydraulic system according to the load of each oil cylinder, reduces the influence of load on the oil intake of each sub-leveling system, so as to carry out preliminary synchronous adjustment to adjusting ram.

This invention discloses a liquid engine ignition device and method. The liquid engine ignition device includes a storage tank, an ignition tube, an exhaust check valve, and a shaped shuttle valve. The storage tank contains a storage tank piston, dividing the tank cavity into a storage chamber and a storage gas chamber. The ignition tube contains an ignition tube piston, dividing the ignition tube cavity into a tube body storage chamber and a compression gas chamber. The tube body storage chamber can hold the ignition propellant required for each ignition. The inlet of the tube body storage chamber is connected to the storage tank cavity, and the outlet is connected to the combustion chamber. During ignition, the shaped shuttle valve connects the compression gas source to the compression gas chamber, pushing the ignition tube piston to move and extruding the ignition propellant from the tube body storage chamber into the combustion chamber. In the non-ignition state, the compression gas chamber is connected to the storage tank cavity, pushing the storage tank piston to move and filling the tube body storage chamber with the ignition propellant from the storage tank cavity. This invention provides an engine ignition device that can automatically fill the ignition propellant and achieve multiple ignitions, and has a simple structure and good stability.

The invention discloses a rotation control system and method and an arm type aerial work platform, and relates to the technical field of engineering machinery. In the rotation control system, an oil outlet of a main pump communicates with an oil inlet P of a proportional flow valve, an oil port A1 and an oil port B1 of the proportional flow valve communicate with an oil port V1 and an oil port V2 correspondingly, and an oil return port T of the proportional flow valve communicates with an oil tank; the oil port C1 is communicated with an oil port A2 of the motor, and the oil port C2 is communicated with an oil port B2 of the motor; the oil port V1 is communicated with the oil port C1 and a first inlet of the first shuttle valve through the first balance valve; the oil port V2 is communicated with the oil port C2 and a second inlet of the first shuttle valve through a second balance valve; an outlet of the first shuttle valve is communicated with an inlet of the proportional overflow valve, and an outlet of the proportional overflow valve is communicated with the oil port V1 and the oil port V2. The rotation control system solves the problems of pressure impact and vibration in the starting and braking process of the system.

The invention provides a mining multifunctional valve group and a control method thereof, the mining multifunctional valve group is connected among a hydraulic rotary motor, a pair of execution cylinders and a pair of synchronous oil cylinders, and the mining multifunctional valve group comprises a valve body, a first pressure reducing valve, three two-position three-way electromagnetic directional valves, a pair of two-position four-way proportional valves and a synchronous flow distributing and collecting valve; the two two-position four-way proportional valves are respectively provided with a pair of pressure compensation valves, a pair of pressure limiting valves and a shuttle valve; the pressure compensation valve is used for adjusting the working oil pressure, the pressure limiting valve is used for carrying out secondary pressure setting on the pressure required by each executing mechanism and simultaneously meeting the requirement for instant high-pressure discharging, and the shuttle valve is used for enabling each two-position four-way proportional valve to output pressure outwards after a fixed pressure difference is added on the corresponding highest pressure. The mining multifunctional valve group can prevent the shaking phenomenon caused by pressure fluctuation of an oil source, improve the control precision of each executive component in a bottom cleaning device, avoid impact damage to a control valve due to action change of the executive component or encountering an external load, and avoid accidental rotation of a rotation mechanism.

The shuttle valve spool includes a substantially cylindrical spool body having a shell surface and an axial through bore defining a longitudinal axis. Hydraulic fluid can be directed to a valve chamber formed in the through bore via first and second axial ends of the spool body having different pressure levels. The valve body is housed within the valve chamber and is axially slidable from the first shoulder to the second shoulder and vice versa, such that higher pressure can be directed to the valve chamber and further to at least one collection area on the first circumferential portion of the shell surface via the radially oriented outlet aperture. The discharge region is formed as another recess on the second circumferential portion of the shell surface, which is circumferentially spaced from the collection region by the filtration region. The radial distance from the collection region, the discharge region, and the filter region to the longitudinal axis is less than half the diameter of the shell surface, and the radial distance from the filter region to the longitudinal axis is greater than the radial distance from the collection region to the longitudinal axis.

The utility model provides a brand new four-wheel drive tractor gearbox hydraulic system which comprises a gearbox, a first gear pump and a second gear pump, a PTO piston, a four-wheel drive piston and a differential piston are arranged in the gearbox, and the first gear pump and the second gear pump are both connected with the gearbox through oil pipes. The output end of the first gear pump is connected with a first electromagnetic valve, a second electromagnetic valve and a third electromagnetic valve through oil pipes, the first electromagnetic valve is connected with a PTO piston through an oil pipe, the second electromagnetic valve is connected with a four-wheel-drive piston through an oil pipe, and the third electromagnetic valve is connected with a differential piston through an oil pipe. The second electromagnetic valve is further connected with the first shuttle valve through an oil pipe, and the first shuttle valve is connected with the second shuttle valve and the first electromagnetic valve through oil pipes. According to the hydraulic system, the heat dissipation function of the gearbox can be achieved, and the heat balance requirement is met; and two-drive switching can be carried out through electric control.

The invention belongs to the field of hydraulic test equipment, and provides a shuttle-valve-free type small-diameter seamless steel pipe hydraulic test machine which comprises a water tank, a vertical plate is fixedly connected to one end of the interior of the water tank, a water outlet pipe is fixedly installed on the side face of the vertical plate, and a rotating connector is rotatably installed at one end of the water outlet pipe. A left end plate is fixedly installed on the rotating connector, and a clamping mechanism is installed at the other end of the interior of the water tank. According to the invention, the detection mechanism is arranged, and a plurality of detection assemblies are arranged on the detection mechanism, so that when the seamless steel pipe is deformed, the detection mechanism can detect a bulge on the seamless steel pipe and prompt a worker, thereby realizing the hydrostatic test detection of the seamless steel pipe, and compared with the visual inspection of the worker, the detection efficiency is improved. The device can detect tiny deformation on the seamless steel tube, so that the detection result is more accurate, missing detection and error detection are avoided, and the detection efficiency is greatly improved due to the fact that a plurality of parts on the seamless steel tube are detected at a time.

The reciprocating pump comprises two sealing deformation pieces and a cooperation assembly, one of the two sealing deformation pieces is divided into a first liquid chamber and a first air chamber in the reciprocating pump, and the other one of the two sealing deformation pieces is divided into a second liquid chamber and a second air chamber in the reciprocating pump. The reciprocating pump is characterized by further comprising an air inlet flow path, an auxiliary air path, a shuttle valve, a first pilot valve and a second pilot valve, the pilot valve of a mechanical structure is used for tracking and monitoring the deformation state of the sealing deformation part, and the pilot valve and the shuttle valve are associated through the auxiliary air path; selective communication between the air source and the first air chamber and the second air chamber is achieved through the shuttle valve of a mechanical structure, alternate liquid inlet and liquid outlet of the first liquid chamber and the second liquid chamber are achieved, the overall structure is simple, a high-precision electric control detection sensor does not need to be used, cost is low, precision is high, and the precision requirement of pneumatic control is met.

The present invention relates to a method for inspecting a shuttle valve (2) in a pneumatic system (100), wherein the shuttle valve (2) has a first shuttle valve interface (2.1), a second shuttle valve interface (2.2), and a third shuttle valve interface (2.3), wherein the higher of the pressures (p1, p2) applied at the first shuttle valve interface (2.1) and the second shuttle valve interface (2.2) is always regulated to the third shuttle valve interface (2.3), wherein the method comprises the following steps: a) regulating a first pressure (p1) to the first shuttle valve interface (2.1); b) obtaining an indication value (G1, G1T) at the first shuttle valve interface (2.1) for the first pressure (p1); and c) comparing the indication value (G1, G1T) for the first pressure (p1) with a predetermined first comparison value (GV1, GS1) set for this purpose, and if the deviation is greater than a first tolerance (T1): obtaining and / or outputting a fault (E) in the shuttle valve (2).

The present application relates to a tractor multi-stage priority system, a hydraulic system and a tractor, wherein the tractor multi-stage priority system comprises a steering priority valve, a multi-stage reversing valve, a liquid filling valve, a solenoid valve, a unloading valve and a shuttle valve group, the steering priority valve being connected to the shuttle valve group; the multi-stage reversing valve is connected to the liquid filling valve; the liquid filling valve can be switched to be connected to the shuttle valve group; the shuttle valve group can be switched to be connected to the steering priority valve, or be switched to be connected to the liquid filling valve, or be switched to be connected to the liquid filling valve and the outlet of the liquid filling valve at the same time. By using the technical scheme of the present application, the priority can be dynamically adjusted by optimizing the flow distribution and the unloading control in the starting stage during the working process of the tractor, and the priority of the steering system is ensured to be the highest, and the load starting is avoided when the engine starts, thereby providing reliable guarantee for the stable operation of the tractor.

This utility model discloses a universal rotary joint installation structure, including a rotary joint, a hose, a shuttle valve, and a hose limiting mechanism. The rotary joint is vertically fixed to the tail end of a machine tool spindle via a threaded connection. The hose is horizontally positioned, with one end connected to the rotary joint via a right-angle connector and a straight connector, and the other end connected to the shuttle valve via a transition connector. A spindle box is located on the outer side of the machine tool spindle, and a mounting base is fixed to the upper side of the spindle box. The hose limiting mechanism is located on the mounting base and has a limiting channel. Anti-collision rubber blocks are provided on both sides of the limiting channel. The height of the limiting channel is less than the outer diameter of the hose, and the width of the limiting channel is greater than the outer diameter of the hose. The hose passes through the limiting channel. This installation structure facilitates the installation and use of the rotary joint, avoids damage to the rotary joint, and gives the rotary joint a longer service life and a lower failure rate. It is adaptable to complex working conditions and is applicable to both mechanical and electric spindles.

A closed, gravity-fed measured volume burette for intravenous (IV) fluid delivery and flush system supporting multiple input combinations for simplicity and standardization. Able to handle both hazardous and non-hazardous drugs, this system may incorporate plastic and elastomeric materials that are resistant to the effects of antineoplastic materials in conjunction with a hazardous air filter module while still integration compatible with electronic peristaltic pumps for finer control of flow rate and when the IV infusion recipient's physical position is not compatible with a gravity-fed flow. The buoyant-activated shuttle valve enables the AutoStart function providing steady flush of the IV line to the patient for optimized vein patency from the Primary IV fluid feed. This Primary line works in conjunction with a Secondary IV fluid feed and a needleless connector Drug Port for multiple feed and flush conditions directed by way of a monoblock design supporting combinations of rotary, toggle, and check valves.

The utility model discloses a hot oil flushing valve group, and relates to a hot oil valve group, in particular to a hot oil flushing valve group. Comprising a valve block, a low-pressure end hot oil shuttle valve and a direct-acting overflow valve. A communicating oil way is arranged in the valve block, and the valve block is further provided with a working cavity C1, a working cavity C2 and an oil port T; the low-pressure end hot oil shuttle valve is mounted in the valve block, the C1 working cavity is communicated with a fourth port of the low-pressure end hot oil shuttle valve, and the C2 working cavity is communicated with a second port of the low-pressure end hot oil shuttle valve; the direct-acting overflow valve is installed in the valve block, a fifth oil inlet of the direct-acting overflow valve is communicated with a third port of the low-end and low-pressure-end hot oil shuttle valve, and a damper is arranged above a sixth oil outlet of the direct-acting overflow valve. Automatic switching of high-temperature oil liquid, pressure stabilization and system protection are achieved; the modular and integrated design is adopted, the structure is compact, maintenance is convenient, and the device is suitable for engineering vehicles and other harsh working conditions.