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Clunking noise - Desperate - Please advise.

What non return valve did they install, is it the sprung loaded or clacker type.

The later usually is more a metal to metal tinkle/rattle.

Don't know. The system (pipes and boiler) si old. There is a rattle if the CH circulator is on the lowest speed.


MickyG - If I could live with the noise I wouldn't be asking for advice.
 
If you draw the system out and follow the flows you'll work out why your getting noise when you are.
 

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