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Danfoss Heating - Page 1
Data sheet Automatic balancing valves ASV ASV-P DN15-40 ASV-PV DN15-40 ASV-PV DN50 ASV-PV DN65-100 ASV-BD DN15-50 ASV-I DN15-50 ASV-M DN15-50 Description / Application ASV balancing valves are used for dynamic hydronic balance in heating and cooling systems. Dynamic balancing means: permanent balancing from 0 to 100 % load by controlling the pressure in systems with variable f low. At partial loads, when the f low is decreased by the control valve, pressure limitation is still performed and consequently performing dynamic balancing. By using ASV you avoid using complex and time consuming commissioning methods. Dynamic balancing of the system in all loads helps you to save energy and improves climate comfort and control. F low limitation By using combination of pressure controller ASV and settable terminal’s unit valve, f low limitation is established. F low limitation for each terminal unit prevents underf lows on distant units and overf lows on others thus allows efficient pumping. Lower noise emission Differential pressure limitation provides the pressure over the control valve not to increase at partial loads thus noise emission will be lower. (This is the reason why DIN 18380 requires control of differential pressure by partial load.) No balancing method needed F low limitation is achieved by adjusting each hydronic loop separately without inf luencing others, which consequently results in one time adjusting process. No special balancing method is needed so commisioning cost can be saved. Control valve authority Controlling differential pressure over the control valve means that authority is high – which allows an accurate and stable control as well as energy saving. Zone balancing By installing the ASV sets you can divide the piping system in pressure independent zones. This allows a gradual connection of zones to the main in new constructions or at renovation without using an additional balancing method. There is no need to perform a new commissioning every time the system is changed because the hydronic balance is done automatically. ASV-P valves have fixed setting (10 kPa). ASV-PV valves are settable in different ranges: • 5-25 kPa setting is mostly used for radiator application, • 20-40 kPa setting is used for radiator, fan coil, chilled beam and f lat station applications, • 35-75 kPa setting is used for f lat station and fan coil, chilled beam application, • 60-100 kPa setting is used for large terminal unit application (air handling units, fan coils, etc.). Using ASV valves it is possible to optimize pump head while independent pressure zones allow to keep authority of terminal unit’s valve high. DEN-SMT/SI VD.A6.E1.02 © Danfoss 06/2012 1