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Check Valve on " Air out " and extrol tank ??
Hey guys, I just had a boiler installed and they put 2 check valves on the extrol tank and on the air vent " to be able to quick change them out ".. Is this a common practice ? The thing that worries me is I didn't hear any air come out of that vent at all and my system still has air in it even after purging several days ago. The tank doesn't seem to be expanding with the heat pressure as I can feel no heat on it like before they did this. In my mind, in order to make the check valve work there must be something pressing against it to open the valve but there isn't so how can it work ??