Danfoss ASV automatic balancing valves provide a simple, reliable and cost-effective way to create hydronic balance in two-pipe heating or cooling systems. They solve the technical issue of pressure fluctuations: the root cause of system imbalances and problems such as uneven heat distribution, noise and high energy consumption. ASV consists from two components; a return-pipe mounted differential pressure controller ASV-P or ASV-PV and flow-pipe mounted partner valve ASV-BD, ASV-I or ASV-M. An impulse tube connects both valves so the differential pressure over the riser can be controlled. In combination with Danfoss RA-N or RA-UN pre-setting valves on the radiators a perfectly balanced system, in both full and partial load conditions, is achieved.
Features and benefits
Visible setting scale
Simple adjustment of the differential pressure setting, no special equipment is required. The clearly visible setting scale makes it easy to determine if the setting is adjusted correctly. The setting ring can be locked to prevent unauthorized adjustments.
Short build in height
The installation dimensions are decreased for flexible and convenient installation.
Faster and better flushing
Increase the reliability of the system by flushing it and remove before putting the system into operation. To flush and fill a system faster, the ASV-PV valve can temporarily be locked in an open position by a flushing ring accessory.
The valve body and pressure membrane are combined into one component. This design ensures optimal low flow performance and extremely ideal differential pressure sensitivity for each individual DN size valve.
Branch should be balanced with a differential pressure controller for dynamic hydronic balance, with following characteristics:
- Valve should keep stable differential pressure across the branch by membrane driven controller
- Valve should have variable Differential pressure setting.
- Minimum needed differential pressure over the valve should not be higher than 10 kPa, independently from Dp setting
- Valve should have metal to metal (valve cone and seat) sealing to ensure optimal performance of differential pressure control at low flows
- Differential pressure setting should be linear via visual scale and without tool, locking function should be integrated to prevent unauthorized change of setting
- The setting range should be adaptable via spring replacement. Spring should be exchangeable under pressure
- Valve should provide differential pressure setting range fit to application to ensure optimal system performance (such as 5-25 kPa setting range for radiator based systems)
- Valve capacity per valve size should cover flow range according to VDI 2073 Standards (with water velocity of up 0.8 m/s)
- Valve should have shut-off function separated from the setting mechanism. Shut-off service function should be possible to do by hand / without tool
- Drain function should be integrated in valve
Valves should have integrated flushing service function. Flushing can be done with flushing accessory
- Valve should be delivered with impulse tube. Inner diameter of impulse tube should not be bigger than 1.2 mm to ensure optimal performance within the system
- Valve should be delivered with thermal insulation caps, up to 120°C
- Valve should be delivered in reliable packaging for safe transport and handling
- Pressure class: PN 16
Temperature range: 0 … +120 °C
- Connection size: DN 15-50
- Connection type: Internal thread ISO 7/1 (DN 15-50),
- External thread ISO 228/1 (DN 15-50)
- Δp setting range: 5-25 kPa, 20-60 kPa
- Max differential pressure across valve:1.5 bar
Installation: differential pressure controller should be mounted on return pipe with connection via impulse tube to supply pipe.
Experts within Heating
Greg Tracy has been working in the HVAC industry for the last 15 years. Having worked at Danfoss for 10 years, Greg managed the Danfoss Underfloor Heating division in the UK. For the last 5 years he has been working and managing the Danfoss HVAC division with consultants and contractors on some of Londons most prestigious Commercial buildings.
Send Greg an email