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So, given the valve that I currently have, should it be completely open or somewhere in between open and closed?

Here's my situation: I have a Weil Mclain boiler (installed in 95) in my house that feeds baseboard radiators through three zones. It's a closed loop system and the boiler is cast iron and natural gas fired. The system has a smaller pipe (3/4 or an inch) that goes between the main incoming...