Teaching aid for demonstrating working principles of diaphragm solenoid valve

A teaching aid for demonstrating working principles of a diaphragm solenoid valve comprises a pedestal, a demonstrating frame and a demonstrating solenoid valve. The demonstrating frame is mounted onthe pedestal, the demonstrating solenoid valve is fixedly mounted in the demonstrating frame, the sidewall of the demonstrating frame is provided with a structure demonstrating window and a motion demonstrating window, and the inner wall, facing the demonstrating frame, of the motion demonstrating window is provided with an LED screen; the demonstrating solenoid valve comprises an electromagneticpower cavity, a control cavity and a diaphragm cavity, and casings of the electromagnetic power cavity, the control cavity and the diaphragm cavity are made of transparent materials; and the LED screen projects a light source to the electromagnetic power cavity, the control cavity and the diaphragm cavity and carries out demonstration for the outside of the demonstrating frame via the motion demonstrating frame. The teachi