Solenoid valve overview:

Solenoid
valve ( solenoid valve ) is an industrial equipment controlled by
electromagnetic control, it is an automatic foundation of control fluid,
belongs to the actuator, and is not limited to hydraulic and pneumatic.
Use the direction, flow, speed, and other parameters of the media in
the industrial control system. The solenoid valve can cooperate with
different circuits to achieve the expected control, and the accuracy and
flexibility of control can be guaranteed. Solenoid valves have many
kinds, different solenoid valves in the control system of different
positions, the most commonly used is one-way valve, safety valve,
direction control valve, speed regulator valve.

Working principle:

The
solenoid is in a closed cavity, with holes in different positions, the
piston, two sides are two electromagnets will be attracted to the body
will be attracted to the body will open or close different hole,
hydraulic oil will enter different draw-off pipe, and then through the
pressure of the cylinder piston, piston rod driven mechanical device By
controlling the current on-off of the electromagnet, the mechanical
motion is controlled.