Proportional control valve is mainly used for open loop control; the output of proportional control valve is proportional to the input signal, and the magnetic force generated by the electromagnetic coil in the proportional control valve is proportional to the current. In the traditional type of hydraulic For example, the pressure valve operates under a certain set pressure, the flow valve keeps passing the set flow and the on / off switching of the directional valve to the flow direction. Therefore, these control valve system functions are subject to some limitations, as the technology advances, many hydraulic systems require flow and pressure can be continuous or proportional to the control valve input signal changes.Although the hydraulic servo system to meet their requirements , But also high precision, but for most industries, they do not require the system has such a high quality, and hope that under certain conditions of control performance, while low price, reliable, easy to maintain, so the ratio Control valve is developed in this context. Proportional control valve can be divided into pressure control valve, flow control and direction control valve three types. Pressure control valve: the proportion of electricity The magnetic valve instead of the pilot relief valve hand control device will become a pilot-scale proportional relief valve, the hydraulic pressure output by the input signal continuous or proportional control. Flow control valve: proportional solenoid valve to replace the throttle or speed The valve hand adjustment device and the input signal to control the throttle or throttle valve throttle opening, continuous or proportional control of its output flow, so the throttle opening can be determined by the size of the input signal voltage Direction Control Valves: Proportional Solenoid Instead of a directional valve, the general solenoid valve forms a direct acting proportional directional valve whose slide shaft not only transposes but also translates the stroke continuously or proportionally, thus connecting between ports The oil flow area can also be changed continuously or proportionally, so the proportional directional control valve can not only control the movement direction of the actuator, but also control its speed.The hydraulic components actuated by the above various proportional valves are hydraulic cylinders or hydraulic motors.
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