The working principle of the solenoid valve, the solenoid valve has a closed

chamber, a through hole is opened in different positions, each hole leads to a different

tubing, the cavity is a valve, both sides are two electromagnets, which side of the

magnet coil electrified valve body will be attracted to which side, By controlling the

movement of the valve body to stop or leak different oil discharge holes, and the

oil inlet hole is usually open, the hydraulic oil will enter a different drainage pipe,

and then through the pressure of the oil to push the oil just piston, the piston and

drive the piston rod, the piston rod drives the mechanical device. In this way, mechanical

motion is controlled by controlling the current of the electromagnet. Categories:

Solenoid valves at home and abroad are divided into three categories in principle

(namely: direct acting type, step by step direct acting type, pilot type), and are divided

into six sub-categories from the difference in valve disc structure and material and

principle (direct acting diaphragm structure, step by step heavy plate structure,

pilot film structure, direct acting piston structure, step by step direct acting piston

structure, pilot piston structure), according to the number of gas path is divided

into 2 Pass, 2-bit 3-bit, 2-bit 4-bit, 2-bit 5-bit.