The proportional control valve is mainly used for open loop control; the output of the proportional control valve is proportional to the input signal, and the magnitude of the magnetic force generated by the electromagnetic coil in the proportional control valve is proportional to the current.
In the traditional type of hydraulic control valve, only the hydraulic pressure can be controlled. For example, the pressure valve operates at a certain set pressure, the flow valve maintains the set flow rate, and the directional valve passes through the flow direction. /Break switching. Therefore, the system functions of these control valves are subject to some restrictions. With the advancement of technology, many hydraulic systems require flow and pressure to change continuously or proportionally with the change of the control valve input signal. Hydraulic servo system Although they can meet their requirements and have high precision, for most industries, they do not require such a high quality system, and they hope that under the conditions of ensuring certain control performance, at the same time, the price is low and the work is reliable. Maintenance is simple, so proportional control valves are developed in this context.
Proportional control valves can be divided into three types: pressure control valves, flow control and directional control valves.
Pressure control valve: The manual adjustment device that replaces the pilot type relief valve with a proportional solenoid valve becomes a guided proportional relief valve whose hydraulic pressure is continuously or proportionally controlled by the input signal.
Flow control valve: replace the throttle valve or the speed control valve manual adjustment device with a proportional solenoid valve and control the throttle opening of the throttle valve or the speed control valve with the input signal, and control the output flow rate continuously or proportionally. Therefore, the opening of the orifice can be determined by the voltage of the input signal.
Directional control valve: The general solenoid valve of the proportional solenoid valve instead of the directional valve constitutes a direct-acting proportional directional valve. The sliding shaft can be changed not only, but also the stroke of the transposition can be changed continuously or proportionally, so the communication between the ports is connected. The oil area can also be changed continuously or proportionally, so the proportional directional control valve not only controls the direction of movement of the actuator but also controls its speed.
The hydraulic components that are driven by the above various proportional valves are hydraulic cylinders or hydraulic motors.
Http://news.chinawj.com.cn Editor: (Hardware Business Network Information Center) http://news.chinawj.com.cn
Rooftop Pv System,Short-Circuit Voltage,Rooftop Solar Power System,Pv Mounting Solar System
ZHONGWEI CITY YINYANG NEW ENERGY , https://www.yinyangnewenergy.com