What is an Indirect Acting Solenoid Valve?

Indirect acting solenoid valves use the pressure energy of the operating fluid to open and close the valve seat and therefore needs a pressure differential to operate (minimum 0.1bar). The pilot system functions as a booster, so that even with a solenoid of lesser magnetic force (than that of a directly actuated valve), fluids flowing at higher rates under high pressures can be controlled. Both pistons and diaphragms are used as sealing elements for the main seat.