Self-acting, medium-operated proportional controller, which through automatic opening of the valve prevents exceeding pressure before the valve (SAVA) and behind the valve (SAVD). The actuator features two diaphragms, which enable the valve to open in case of a defect at the control diaphragm. The controller is mainly used in district heating systems.
Function of the SAVA controller: the high upstream pressure in front of the valve is led to the lower part (high pressure connection) of the diaphragm inside the controller. Through a channel in the controller, the medium pressure is led from the valve to the upper side (low pressure connection) of the diaphragm.
The spring power of the control valve now affects the diaphragm, thus determining the effective differential pressure.
Function of the SAVD controller: the valve outlet pressure of the valve is led to the lower part (high pressure connection) of the diaphragm inside the controller. The upper side (low pressure connection) of the diaphragm is connected to the atmosphere. The spring power of the control valve now affects the diaphragm, thus determining the closing pressure.
Features and benefits
Eliminates pressure variations and provide optimum operating conditions with improved temperature control quality
Made for demanding systems, resistant to corrosion, cavitation and dirt
Connected system is protected against pressure surges, fluctuations, cavitation and noise

Differential pressure and flow controllers in district heating or cooling systems (variable flow)
Balance your network, save energy and improve end user comfort by hydronic balancing and control of district energy networks.
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Case studies
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Solar heating plant reduces CO2 emissions by 15,700 tonnes annuallyThe world’s largest solar heating plant in Silkeborg, Denmark harnesses energy to heat the homes and workplaces of 40,000 citizens. It supplies 18-20% of the annual heat consumption in the city of Silkeborg, Denmark, which has an ambitious target of CO2 neutrality in heat production by the year 2030.
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District energy as the heating and cooling solution in Teknopark Istanbul, TurkeyBuilding: Office Application: Production of heating, cooling and domestic hot water Challenge: Design and construct customized district energy solutions for all buildings on the park Solution: Danfoss designed and constructed 3 pre-assembled DSE substations containing control valves for the heating, cooling and domestic hot water, heat meters, self-acting controllers and electronic controllers connected to a central Building Management System.
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First ever district heating system with substations in Turkey600 residents in the town of Soma in Western Turkey now enjoy the comforts of a reliable and cheap heat supply from the town’s brand new district heating system. In the coming years, more than 8,000 households will be joining the system that exploits the excess heat from the municipal power plant – a great improvement from the charcoal boilers of the past, and much less expensive.