ASV valves are automatic balancing valves. Together with Danfoss presetting radiator thermostatic valves they are part of the Danfoss two-pipe solution and are perfect for creating optimal hydronic balance in residential two-pipe heating systems. One of the major challenges in heating systems is a lack of good hydronic balancing, caused by differential pressure, which is changing constantly and unpredictably in the heating system. This results in complaints from residents about poor indoor comfort, noise and high energy bills. The ASV valves can also be used in cooling applications (fan coil, chilled beam, etc) with variable flow, to secure an automatic hydronic balance (see general ASV datasheet for details).