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) - Self-acting flow controller AFQM 6* and AFQM 2. * With adapter 065B3527 for AFQM 6 or AFQM PN 25, if produced before March 2015. Used with adapter 065B3527 in combination with: - Valve types VFG(S) and VFU.