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gavinda, actually I did not have the valve at the first place at all and I had a problem.. whenever I switched on cold water the boiler was firing up for a second or so. This was due to an interim pressure drop on the mains inlet to the boiler and the boiler was heating up the wrong side of...

fairy works for me as well! Just give it a try and you won't regret ;)

Thanks Dan. What about the screw on top of the valve - what is it for? Can I turn it left-right :twisted: ... without shutting off mains?

Hello, I've got a new boiler installed recently. The system was converted from vented to sealed. It has also 2 double check valves - first on the mains just before pressure reducing valve for my property and the other one on mains inlet to the boiler. This overall works great, though the...