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I've just had Drayton TRVs on my radiators replaced by Mistral 10 NP bi-directional valves (made by Yorkshire Fittings). I now have mistral blowing through my valves 8). Seriously, they are noisy and I would like to hear from anybody who has or has had the same make of valves and...

:( :( I have had recently the controls on my radiators (Drayton TRV2) replaced by Mistral 10 NP bi-directional valves on all my radiators (11)in the house since 4 of the Drayton controls were faulty. Since then there is a noise of swishing water (water flow) when the controls are operating...