Actuators with safety function (AME 13, AME 23 or AME 33) and actuators without safety function (AME 10, AME 20 or AME 30) are mainly used with VS, VM, VB, AVQM and VMV (only with AME 10) valves. Safety version is activated automatically in case of power failure or if the power supply is switched off by the safety thermostat. Actuators automatically adapt stroke to valve end positions which reduces commissioning time.