The valve actuator TriVax combines technology from the fields of hydraulics, mechanics and electronics in a single, compact casing, thus reducing the complexity of earlier solutions. The flanges for explosion protection have been integrated completely into the casing for the first time, and the actuator is extendable on a modular basis. Innovative details like the switch, which can be locked in any position, increase the safety of operation. All controls found in the user interface are coloured blue.