The function of a NAMUR solenoid valve is to control media flow: the valve itself is controlled by an electric solenoid, which opens or closes the valve, by controlling the amount of air–via a pilot–to the pneumatic actuator. A pneumatic actuator converts energy–compressed air–into motion. The solenoid and actuator work in tandem to control flow speed, flow amount, and flow direction. Likewise, the valve is operated in either the normally closed, or normally open position.