I need to balance my radiators but apart from 1 rad, all radiators are fitted with Lifestyle RT212 TRV's. All the lockshield valves are fully open, and some TRV's are fitted to the return pipe, whilst others are on the flow. Apparently a radiator can be balanced more efficiently from this model of TRV. Does anybody know how the rads are balanced from a Drayton Lifestyle RT212 TRV?