The actuators for 3-point controls with or without safety function are suitable to be used with VS2, VM2, VB2 and AVQM valves. The safety function on AMV 23 SL is activated automatically in case of power failure or if the power supply is switched off by the safety thermostat. This function provides safety shut off on power failure. In addition to basic function such as manual control and position indication, the actuators are also equipped with force sensitive switch-off to ensure that actuators and valves are not exposed to overload. This function automatically ensures the self-adjustment of the end positions on the valve. Actuators are also equipped with stroke limitation that can limit flow in valves. Limitation of stroke is designed with switch that can be set in any desirable position (stroke limit from 0 to 100%).