Construction of spring return pneumatic actuator1,Website:http://www.hugo-valve.com, the extruded aluminum alloy ASTM6005 body can be ... actuator's operating modeThere are two operating modes1, when ball valve closed, pistons outwards, causing the springs to compress, The ... turns clockwise while air is being exhausted from port A.Spring return pneumatic actuator's operating condition1, medium : Dry or ...