The controller is a self-acting differential pressure and flow controller primarily for use in district heating systems. Direct operated, reliable and high precise controller closes on rising differential pressure or when set max. flow is exceeded. The controller has a control valve with adjustable flow restrictor, an actuator with two control diaphragms and spring for differential pressure setting. Differential pressure control and flow control are independent. Together with Danfoss intelligent electrical actuator AMEi 6 intelligent optimization functions are available: iSET-intelligent substation efficiency optimization and iNET-intelligent network balancing