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Banging pipes and venting mains

raemac
raemac Member Posts: 14
I have 2 gorton #2 vents on end of 100 ft mains. The seem to open when cold but close when hot even when no steam comes through. This is causing no ventilation for water to flow back into boiler and get stuck in pipes. My installer of new system separated first floor from 2nd and 3rd floor with electric valves that they use in commercial installations. Lots of banging in pipes. My first question is about set up. Does this look correct? Am a I asking for trouble having 2 zones? Should I have more vents in main at different locations?

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