RA-U valves can be used with all types of thermostatic elements in the Danfoss series and with thermal actuators type TWA. RA-U valves are used in two-pipe heating systems and is available with the following setting ranges for max. water flow: kv = 0.016 - 0.30 m³/h. The valve are supplied with a protective cap which can be used for manual regulation during the construction phase. To be able to distinguish between other valves of the series the protective cap is yellow.