Whistling TRVs

DursleyDonkey · 15 Apr 2018

I have a sealed central heating system with TRVs on all but one radiator. Radiators are on 10mm plumbing. When the room temp is getting close to the TRV setting, the radiators make a really high-pitched whistle, sometimes for many minutes before the TRV shuts off the radiator. It's definitely the TRV causing this, as I can stop it by adjusting it either up or down a small amount.
Is this symptomatic of any problem? Is there a way to stop it?
Thanks

muggles · 15 Apr 2018

Your pump speed is too high, turn it down a bit. May also be cheap TRVs that are vibrating, in which case better TRVs will help

FiremanT · 15 Apr 2018

As far as I know, all modern TRVs are bi directional. it is worth checking for an arrow on the valve body. There should be 2 arrows. If only one, then they have to be fitted on the flow.

I have had noisy TRVs which benefit from being switched over to the flow.

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Whistling TRVs

DursleyDonkey

muggles

FiremanT

DIYnot Local

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