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Posted by HeatPro on May 15, 2006 at 20:30:09:
In Reply to: Re: The steps to Design a Radiator System posted by HeatPro on May 15, 2006 at 20:28:40:
(thus the name of the thread
The steps to Design a Radiator System )
Zone valves are not check valves, they shut off water flow in either direction when they are in the branch circuit to the radiators, so they will shut water off either on the supply or the return
(thus the previous instruction saying that.)
Where you put the zone valve in the 1/2-inch lines going to the radiator is just convenience for you wherever you can get to them easily.