Actuators are primarily designed to control the valve in response to the demand of a controller in District Heating/cooling, Heating, Ventilating and Air conditioning systems. Actuators AMV 655 and 658 can be controlled by electronic controllers with 3-point 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) - Self-acting flow controller AFQM 6 and AFQM.