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Cheers, I tried that already. I took of the cover at the back, it just opens into the shut off / turned on side of the valve.

Hi all. My central heating/hot water is a wolf oil burner. Been in the house since it was built (70s). My problem is the noise coming from this valve on the main heating pipe from the boiler. It kinda tinkles and rattles which then travels through the pipes making the radiators all noisy. I’d...