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Posted by HeatPro on September 12, 2008 at 15:05:45:
In Reply to: Re: building presure do I need a prv if i have a auto fill valve. there is a back flow in the line but no prv posted by greg large on September 12, 2008 at 13:11:25:
An autofill valve is the mistaken name for a PRV:
http://www.heatpro.us/purgeairtree/documents/822E41BCCAE594A598DF192325F4E8A0C56684C3.html
If you had no PRV, the fill pressure would be the pressure of the incoming feed water line. It is a good idea to have a PRV to prevent overpressuring a boiler; but the pressure can be regulated by watching the gauge and shutting off the cold water feed valve when the pressure is correct.