Pilot Operated Solenoid Valve

The pilot operated solenoid valve  uses the same pressure of the fluid to open or close the disc. The coil of the solenoid directs the pressure against the main disc to cause it to open and pass the flow to the outlet.
pilot operated solenoid valve
The pilot operation of a solenoid valve has many advantages; It can handle almost any type of pressure and flow, has low power requirements and is silent.
It works when the solenoid is energized and opens a small hole that drains the area of the spring and thus allows the flow of fluid to pass to the outlet. As long as the solenoid remains energized the spring chamber will be allowing the flow and the valve will remain open. When the solenoid is de-energized the orifice is closed and the venting path is blocked causing the spring chamber to fill again and the spring to push the disc closing the valve.
Advantages of pilot operated solenoid valves: Disadvantages of pilot assist solenoid valves:
•Reduced power consumption, typically smaller solenoid coil. •Must have minimum pressure difference between inlet and outlet port to operate.
•Available for very high pressure systems.  
•High flow rates.  
•Easily converted from normally closed to normally open at reduced cost.  
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