2 way Indirect acting solenoid valve - pilot solenoid valve

2 way Indirect solenoid valve is called Pilot-Operated Valves, also called servo operated solenoid valve. It multiples this small pilot flow, by using it to control the flow through a much larger orifice. Pilot valve needs at least 0.5 bar pressure differentinalto open. When the solenoid is energized, the pilot orifice is opened, which causes the pressure above the membrane to drop. Because of the pressure difference on both sides of the membrane, the membrane will be lifted and the medium can flow from inlet port to outlet port. The extra pressure chamber above the membrane acts like an amplifier, so with a small solenoid still a large flow rate can be controlled.