Summary: direction control valves, this kind of valve, such as one-way valve and directional control valve, used to control the oil flow direction, in order to realize the actuators of start, stop, forward and backward. No separate cartridge, this kind of valve body, composed of valve core and valve set of instrumentation components instrumentation in instrumentation block preformed hole, instrumentation block body and piping effect, through the block channel will insert a few components together, then into a loop. There are usually switch valve, proportional valve, servo valves and digital valve. After the switch valve setting can only work in setting state. Proportional valve and servo valve can be according to the input signal connection or in proportion to the parameters of the control system. Side of the digital valve control valve directly with digital signal. Execute component in a hydraulic system ( Such as hydraulic cylinder, hydraulic oil motor) At work, need to start motor, brake, and often adjust speed and adapt to the change of external load, therefore must have a mechanism to control and adjust the hydraulic components, usually use control valve to complete. Foreign don't work, it is only used to control actuators, make it meet the requirements of the host performance. 1, the control valve according to its function classification ( 1) Direction control valves, this kind of valve, such as one-way valve and directional control valve, used to control the oil flow direction, in order to realize the actuators of start, stop, forward and backward. ( 2) Pressure control valve, the valve, such as relief valve, pressure reducing valve and sequence Industrial Valves, etc. , are used to control the pressure in the hydraulic system, in order to meet the needs of the components of the work force, torque, or program control. ( 3) Flow control valve, the valve, such as throttle valve and control valve, used to control the size of the oil flow in hydraulic system, in order to realize the movement speed of executive element needed. 2, control valves according to the connection methods of classification ( 1) Pipe connection, pipe valve adopts screw connection, it directly in series in the pipeline system, don't need a dedicated connection plate. ( 2) Plate connection, plate valves need a dedicated connection plate, valve with screw connection plate in the pipe connected to the connecting plate and plate in the front of the valve installation, connect the tubing at the back of the plate. ( 3) Flange connection, the flow is greater than 300 l/min, use flange connection. At the end of pipe welding, flange plate with screw connection to the valve body. ( 4) Integrated block, integrated block is a generalization of hexahedron, surrounded by side are connected to the actuators with pipe joint, the rest of the three sides install valve components. Integrated piece inside the hole and the valve are interlinked, basic circuit. Under the integrated block to block and block, the junction surface between the several integrated block with long bolt pile up, already formed the whole hydraulic system. Its features are: compact structure, less tubing, easy handling and maintenance. ( 5) type, superposition valve are standardized hydraulic components, through the bolt body spliced together, superposition valve hydraulic system can be connected directly to each other. Each stack valve control valve of the role, and ACTS as the channel body. Its features are: compact structure, less tubing, small volume, light weight, don't need to pipe connection, small pressure loss, save a lot of tubing and connectors. ( 6) No separate cartridge, this kind of valve body, composed of valve core and valve set of instrumentation components instrumentation in instrumentation block preformed hole, instrumentation block body and piping effect, through the block channel will insert a few components together, then into a loop. Its characteristic is: very suitable occasions with large flow. 3, the classification of the control valve according to the manipulation methods of general with hand, foot, mechanical, pneumatic, electric and hydraulic, sometimes in the form of several combinations. 4, according to the working pressure classification according to the working pressure of the control valve in the hydraulic system can be divided into: the low pressure valve, medium pressure and high pressure valves. 5, according to the control principle of classification is usually switch valve, proportional valve, servo valves and digital valve. After the switch valve setting can only work in setting state. Proportional valve and servo valve can be according to the input signal connection or in proportion to the parameters of the control system. Side of the digital valve control valve directly with digital signal.
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