Principle of diaphragm electromagnetic valve: When energized, the electromagnetic coil generates electromagnetic force, lifts the closing part from the valve seat, and opens the valve; When the power is cut off, the electromagnetic force disappears, and the tension spring presses the closing part against the valve seat, causing the valve to close.

The diaphragm type solenoid valve has a closed chamber with through holes in different directions, each hole leading to different oil pipes. There is a valve in the center of the chamber and two electromagnets on both sides. When the electromagnetic coil on which side is energized, the valve body will be attracted to which side. By manipulating the movement of the valve body, different oil discharge holes will be blocked or leaked. The oil inlet hole is normally open, so hydraulic oil enters different oil discharge pipes, and then hydraulic pressure pushes the piston, which in turn drives the piston rod and piston rod. In this way, mechanical motion is controlled by manipulating the current of the electromagnet.

Article source: Jiangmen Pneumatic Equipment Manufacturer www.jh-hydraulic.com