Valve internal Structure
FIGURE 1: INITIAL/CLOSED STATE OF THE VALVE
Fluid fills all chambers of the solenoid valve. The valve is closed initially.
FIGURE 2: ACTIVATING THE SOLENOID VALVE
Upon activating the solenoid, the pilot piston moves to open the bleed orifice to allow fluid that was inside the pilot piston chamber to escape to the outlet
FIGURE 3: OPEN STATE OF THE SOLENOID VALVE
Due to the pressure difference in the inner chamber and the outlet chamber that overcome the spring force, the solenoid assembly moves to open the fluid outlet.(The orifice of pilot piston open is larger than the inlet small hole).
FIGURE 4: DEACTIVATING THE SOLENOID
Upon deactivating the solenoid, the pilot piston moves to close the bleed orifice. An equilibrium of fluid pressure is reached causes the spring to push the solenoid assembly to close the flow outlet, the solenoid valve is closed, return to Figure 1
Video of operation