3437 results about "Directional Valve" patented technology

Heart valve attachment apparatus and methods that significantly reduce attachment times are provided. The apparatus and methods utilize a connector band to form an interface between a uni-directional valve and a tissue annulus. The connector band is secured to the tissue annulus by retention fingers.

A drip emitter is provided for delivering irrigation water from a supply tube to an emitter outlet at a reduced and relatively constant flow rate. Water enters the emitter through a first inlet and proceeds into a first chamber. When the water pressure is above a predetermined level, a one-directional valve opens to allow fluid flow past the first chamber, through a tortuous path flow channel, and through an emitter outlet. A second inlet is used to compensate for water pressure fluctuations in the supply tube to maintain output flow at a relatively constant rate. Water enters the second inlet and presses a flexible diaphragm toward a water metering surface to provide pressure-dependent control of the output flow. A copper member is mounted to the emitter over the emitter outlet to prevent plant root intrusion into the emitter outlet.

A hydraulic intensifier with a piston and cylinder assembly (1) having a first piston (3) in a chamber (4) of low pressure cylinder and a second piston (7) in a chamber (8) of a high pressure cylinder. The first and second pistons are coupled together and the first piston has a larger cross-sectional area than the second piston. A high pressure output (19) is coupled to the chamber of the high pressure cylinder, there being; means (13) for supplying low pressure hydraulic fluid to the chamber of the low pressure cylinder; an electrically operated directional control valve (11) for controlling the supply of low pressure hydraulic fluid to the chamber of the low pressure cylinder; and electronic means (14) for controlling operation of the directional control valve.

The invention provides an intelligent photovoltaic array washing car used for washing photovoltaic arrays of a large-scale ground photovoltaic power station. A washing head supporting and locating unit and a power unit are arranged on the head portion and the tail portion of a crawler base respectively, a water storage unit is arranged adjacent to the power unit, and a washing head unit is provided with range finder sensors used for measuring the distance between the washing head unit and solar cell panels; the washing head supporting and locating unit comprises a movable base capable of rotating and transversely moving and a working arm set provided with a main arm and an end arm, wherein the main arm and the end arm can pitch respectively; a water pump of a water supply unit is driven by a hydraulic motor; a computer is used as a control kernel of a main control module of an operation control unit; a pair of proportional directional valves of the hydraulic control unit controls two base crawler traveling motors, and other directional valves are electromagnetic directional valves controlled by the main control module. According to the intelligent photovoltaic array washing car, the position and the posture of the washing head unit relative to photovoltaic array panels and the position and the posture of a car body relative to the photovoltaic arrays can be automatically controlled, and the intelligent photovoltaic array washing car is intelligent, efficient, flexible in operation, high in adaptability, easy and convenient to operate, concise in structure and good in washing effect.

The present invention relates to compressed air engine, and is especially one kind of variable air valve driving system for compressed air engine. The system includes one air valve spring, one shaft coupler, one piston rod and one piston inside a cylinder, connected successively to the air valve. There are two communication states between the air passage and the air exhaust electromagnetic directional valve based on the final position of the valve. The valve opening time may be controlled by means of controlling the power-on pulse duration. The present invention has the advantages of capacity of decoupling air valve motion and the crankshaft rotation speed of the pneumatic engine to optimize the air distributing phase, capacity of recovering the vehicle braking energy, convenient braking strength regulation, etc.

A hydrostatic driveline for a vehicle, a method for minimizing a fuel consumption rate of the vehicle, and a method for tracking an optimal state of charge function for a hydrostatic accumulator are provided. The driveline includes a power source, a drive axle, a first fluid accumulator, a second fluid accumulator, an auxiliary circuit including a first pump drivingly engaged with the power source, and a drive circuit including a second pump drivingly engaged with the power source, a motor drivingly engaged with the drive axle, and a directional valve. The second pump is in fluid communication with the directional valve and the directional valve in fluid communication with the first fluid accumulator and the second fluid accumulator. The directional valve may be selectively controlled to direct fluid from the second pump and the motor to the first fluid accumulator and the second fluid accumulator.

In a closed level control system for vehicles, a vehicle body is suspended relative to at least one vehicle axle. The level control system includes pressurized medium chambers, a compressor, an air dryer and a pressurized medium supply vessel which is partitioned into first and second pressurized medium spaces. The two pressurized medium spaces have no direct connection. Either the first pressurized medium space or the second pressurized medium space can be connected to the compressor input or the compressor output via at least one common controllable directional valve so that the pressurized medium from the pressurized medium chambers can be transferred into the first or into the second pressurized medium space or pressurized medium can be transferred from the first or the second pressurized medium space into the pressurized medium chambers.

A choke actuator having an integrated choke control system enabling fast closure and opening of the choke. The choke control system includes integral electronics to receive signals from a surface or subsea control module and control directional control valves to regulate the flow of hydraulic fluid from a local hydraulic supply to the choke actuator. Response times for choke actuation are greatly reduced by locating the electronic control system and directional control valves in an integrated package with the choke actuator and providing a local hydraulic supply. Additional embodiments may also include other electronic sensing and instrumentation enabling the choke control system to monitor and adjust the choke to maintain selected flow characteristics or in accordance with a predetermined production scheme. Any or all of the components of the choke, the choke control system, or the choke actuator may also be retrievable separately from the other components so as to allow maintenance and replacement.

A swing control circuit is provided separately from a hydraulic actuator control circuit. The swing control circuit includes a swing pump motor connected to closed circuits of a swing motor through a solenoid valve that serves as a directional control valve. A swing motor generator is connected to the swing pump motor. The swing motor generator is connected to an electric power storage device of a hybrid type drive system. An exterior-connecting passage for feeding hydraulic fluid to hydraulic actuators of a lower structure and a work equipment is drawn from a pipeline between the swing pump motor and the solenoid valve. A connecting passage solenoid valve is disposed in the exterior-connecting passage. The invention enables hydraulic energy generated in the swing system to be directly fed to the outside of the swing system.

A mud pump is provided with two cylinders for pumping mud in connection with water well drilling, and two sets of hydraulic oil cylinders with pistons connected to and driving the pistons of the mud pump by piston rod connecting plates. A flow divider located downstream from a hydraulic oil power supply pump applies hydraulic power evenly to two sets of mud pump driving cylinders, but the flow divider accommodates re-routing of hydraulic oil to one driving cylinder during a directional valve shift for the other driving cylinder. Rod position sensing switches coupled to an electro-hydraulic control system coordinates the action of the sets of pump driving cylinders and thereby of the mud pumping cylinders, to control and phase the mud driving pistons produce a steady mud pump output simulating the effect of constant velocity pistons.

The invention relates to an experimental device and an experimental method for multi-source information fusion for fault diagnosis of a hydraulic device. The device comprises the following elements: a variable plunger pump, a gear pump, two motors, two suction filters, five throttle and stop valves, two electromagnetic relief valves, an electromagnetic proportional relief valve, two pressure meters, an energy accumulator, two sets of combined sensors, a three-position four-way electromagnet directional valve, a hydraulic motor and a cooler. The experimental device can simulate eight typical running states (faults) of the hydraulic device, including low efficiency, oil and liquid pollution, air suction, leakage, oil pump fault, relief valve failure, motor failure and mechanical failure and can perform cluster analysis and fusion diagnosis to characteristics of the eight faults through a self organizing maps neural network.

A valve assembly has (1) a riser pipe including a valve cup housing and portals blockable, and (2) a central tower which communicates with blockable pathways that pass both liquid and gas, and (3) a bi-directional valve member which controls separation of gas and liquid and directional flow in the chamber. A retainer assembly is provided on the outer peripheral surface of the valve cup so as to facilitate insertion of the valve cup into the container but so as to prevent the unintended removal of the valve cup from the container while still permitting selective valve cup removal when it is desired to do so. The retainer assembly preferably includes a protrusion and a pair of centering skids spaced about the outer periphery of the valve cup. The protrusion includes a radially tapered, vertical extending detent portion and a radially tapered, circumferentially extending ramp portion. The centering skids taper radially inwardly from vertically central portions thereof to the vertical end portions thereof. Upon simultaneous twisting and tilting of the valve cup relative to an annular member on the container such as the shoulder of a stub, the centering skids engage the annular member so as to take up the clearance between the valve cup and the annular member, and the protrusion ramps onto the annular member in a self-threading manner so as to circumferentially distort the valve cup and to permit the valve cup to be turned out of the container.

The invention discloses a control system of a telescopic boom bolt mechanism, which comprises an oil tank, a hydraulic pump, a motor and a second directional control valve which are arranged on a telescopic boom, wherein the oil tank is used for storing hydraulic oil; the hydraulic pump is used for outputting the hydraulic oil in the oil tank into a hydraulic circuit; the motor is used for driving the hydraulic pump; and the second directional control valve is used for controlling the route between the hydraulic circuit and the hydraulic pump or the oil tank to be turned on. Preferably, the control system also comprises a third one-way valve, an energy accumulator and a pressure relay; when a pressure value detected by the pressure relay is more than a preset maximum pressure value, the pressure relay outputs control signals to the motor, and the motor is switched off; and when a pressure value detected by the pressure relay is less than the maximum pressure value, the pressure relay outputs control signals to the motor, and motor is switched on. The system has simple and reasonable design, and can effectively avoid the problem that hydraulic volume in a large chamber influences the control response speed, so as to ensure the sensitive and reliable motions of an arm pin hydro cylinder and a cylinder pin hydro cylinder.

In addition to the consumers of a closed loop, known air supply systems also can supply an external consumer with fresh pressurized air. These systems are very complex with respect to apparatus and furthermore have the disadvantage that already improved pressurized air can escape from the pressurized air store during the supply of the external consumer. A switchable 3/2-directional valve (31) is arranged in the first consumer pressure line (19) of the drive unit (1) and a switchable 3/2-directional valve (32) is mounted in the store pressure line (11) of the drive unit (1) and a switchable check valve is mounted in the bypass line (16) of the store pressure line (11). This check valve disables the throttle function of the bypass throttle (17).

The invention relates to the technical field of jackdrill and discloses a hydraulic control loop used for jackdrill and control system thereof. The hydraulic control loop used for jackdrill includes a hydraulic pump, a drill rod thrust cylinder, a drill rod spin motor, a solenoid directional valve, a directional valve, an unloading valve and a sequence valve. In the hydraulic control loop used for jackdrill provided by the invention, control valves needing controlling all adopt solenoid valves, and the reversing or flux control of the control valves can be realized by transmitting solenoid control signals to the solenoid valves, and the operation staff do not heed to directly operate the control valves; therefore, the work intensity of the operation staff is smaller, the control performance is good and the defect of inaccurate locating and punching of manual operation can be overcome. One hydraulic pump can simultaneously supply oil to the drill rod thrust cylinder and the jackdrill, can simultaneously implement two motions including boosting and drilling, thus reducing the manufacture cost of the jackdrill. The invention also provides a control system for hydraulic control loop used for jackdrill.