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tapping sound from radiator valves?

i changed two radiators and fitted both with danfoss valves after a while the radiators started to make a tapping sound are they fitted correctly?
A BRYANS, February 2009
you have got the flow and return wrong way round
there is a arrow on the trv this should be in the direction of the flow
if this is fitted wrong when it heats up it will make a knocking noice.

john, May 2009
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