Loader excavator accessories XKCH-00022 solenoid valve Hydraulic valve

What is the difference between proportional valve and ordinary solenoid valve?

    Proportional valve is a new type of hydraulic control device. In the ordinary pressure valve, flow valve and direction valve, the proportional electromagnet is used to replace the original control part, according to the input electricity
The gas signal continuously and proportionally controls the pressure, flow, or direction of the oil stream remotely. Proportional valves generally have pressure compensation performance, and the output pressure and flow rate can be unaffected by load changes

1, the ordinary valve is not proportional to the continuous step control, is a pure single action type switch valve, the valve opening direction, opening amount or spring setting force is certain
Cannot be changed according to actual circumstances.

2, proportional valve is proportional to the continuous step control, according to the actual situation changes in the information collected to the target automatic compensation control, the valve opening direction, opening amount or the spring set force is followed, to achieve a series of continuous controlled changes in the movement. Valve control of flow can be divided into two kinds: one is switch control: either fully open, or fully closed, flow is either, or small, no intermediate state, such as ordinary electromagnetic through valve, electromagnetic reversing valve, electro-hydraulic reversing valve. The other is continuous control: the valve port can be opened according to the need of any degree of opening, thereby controlling the size of the flow through, such valves have manual control, such as throttle valves, but also electronically controlled, such as proportional valves, servo valves.

The 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.
The proportional valve is composed of DC proportional electromagnet and hydraulic valve. The core of the proportional valve to realize continuous control is the ratio
There are many kinds of proportional electromagnets, but the working principle is basically the same, they are all developed according to the control needs of the proportional valve