Actuators are primarily designed to regulate valve in the respond to the demand of a controller in District Heating/cooling, Heating, Ventilating and Air conditioning systems. Actuators AME 655, 658 and 659 can be controlled by electronic controllers with modulating or 3-point control output. Actuators can be used without any adapter in combination with: valve types VFM, VFS (DN 65-100), VF (DN 100-150) and VL (DN 100) and self-acting flow controller AFQM 6 and AFQM.