Expert Advice & News

The new RAS-B2 Danfoss Dynamic Valve

The new RAS-B2 Danfoss Dynamic Valve makes balancing a domestic heating systems a breeze.

Unlike most other TRVs, which only act as flow limiters, this latest addition to the Danfoss TRV family features a differential pressure controller. This ensures that pressure drops over the valve remain at a constant level, so flow through the valve is maintained at both full and partial loads. Also the pre-setting of the desired flow is done on the valve, rather than on the separate lock shield valve, which it is estimated could save heating engineers up to two hours of valuable working time. Thanks to this innovative product, heating engineers can now make sure a system is correctly balanced in a fraction of the time it would normally take.

The new Danfoss RAS-B2 enables fast and simple hydronic dynamic balancing. It is also featured on the Danfoss Installer App. By using this time-saving App, heating engineers can calculate, record and document the correct flow and subsequent setting for each radiator on their smartphone or tablet.

Currently the RAS-B2 is the only 100% pressure independent valve demonstrating a constant flow in all conditions, It ensures each radiator receives an equal flow of hot water. As well as optimising end-user comfort, this means that the return temperature is lower (modern condensing boiler efficiency is best at below a return temperature of 55°C) and the pump can run at a lower speed.

Industry research suggests that between 80 and 90% of heating systems in Europe are unbalanced – which, as any heating engineer knows, can result in the common complaints of noisy radiators and uneven heating.

To address unbalanced systems in the uk, updates to building regulation Part L in 2021 are expected to include an increased legal requirement to prove that domestic heating systems are well balanced. Modern, high efficiency controls that meet the new standards will also be required as part of a boiler replacement, so fitting simple valves will no longer be an option for heating engineers.

Forthcoming regulations will aim to make existing UK homes more energy efficient as we move towards the ultimate goal of Net Zero in 2050.”