Excavator machinery accessories 3771417 TM94502 proportional solenoid valve

Proportional valve structure and working principle

1, proportional valve structure.
Proportional valve is a new type of hydraulic control device. The pressure, flow, or direction of the oil stream can be controlled remotely according to the input electrical signal continuously and proportionally. The proportional valve is composed of two parts: electric and mechanical proportional conversion device and hydraulic control valve body.
There are many kinds of proportional electromagnets, but the working principle is basically the same, and they are all developed according to the control needs of the proportional valve. Its function is to continuously and proportionally convert the input electrical signal into the mechanical force and displacement output, and the latter outputs the pressure and flow proportionally and continuously after accepting the mechanical force and displacement.
2. Working principle of proportional valve.
The command signal is amplified by the proportional amplifier, and the proportional output current to the proportional solenoid of the proportional valve, the proportional solenoid output force and the proportional movement of the valve core position, you can proportional control the flow of the liquid flow and change the direction of the liquid flow, so as to achieve the position or speed control of the actuator. In some applications requiring high position or speed accuracy, the closed-loop control system can also be formed by detecting the displacement or speed of the actuator.