Proportional control valve is mainly used for open loop control ( 开环控制) ; Proportional control valve of the output to the input signal is proportional to the relationship, and the proportional control valve solenoid coil in the magnetic force is proportional to the current size. In traditional types of hydraulic control valves, can only be carried out on the hydraulic constant value control, such as: pressure valve is prepared to move in a certain set pressure, flow valve to maintain through traffic, set direction valve for liquid flow direction on/off switch. So the control valve of system functions are subject to some restrictions, along with the advances in technology, many hydraulic pressure system for flow and pressure can be continuous or in proportion to changes along with the change of control valve input signal. Hydraulic servo system can meet the requirements, and the precision is high, but for most of the industry, they do not require system has such a high quality, in the hope that under the condition of guarantee of control performance, and low cost, reliable operation, simple maintenance, so the proportional control Industrial Valves is developed in this context. Proportional valve can be divided into the pressure control valve, flow control and direction control valves. Pressure control valve, proportional solenoid valve to replace heuristic overflow valve hand tuning device becomes conductive proportional relief Industrial Valves, the output of the hydraulic pressure by the input signal is continuous or proportional control. Flow control valve, proportional solenoid valve to replace the throttle or speed regulating valve hand device and the input signal control throttle or speed regulating valve throttle opening, can be continuous or in proportion to control the output flow. So the throttling mouth opening can be determined by the size of the input signal voltage. Direction control valves, proportional solenoid valve to replace the general electromagnetic directional valve valve direct-acting type proportional directional valve, the sliding shaft can not only empathy, and empathy can trip or in proportion to changes in a row, so connected between the oil outlet oil area can be continuous or changes in proportion, so the proportion direction valve not only can control the movement direction of the actuators, also can control its speed. The above various proportional valve actuation hydraulic components for hydraulic cylinder or hydraulic motor.
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