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Posted by Doug Criner on September 20, 2008 at 19:06:23:
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 HeatPro on September 12, 2008 at 15:05:45:
I'm not sure all this is necessary, but thlis is what my hot-water boiler system has, starting from the city water supply:
1. Watts #9 backflow preventer.
2. Bell & Gossett pressure regulating valve, set at 12 psi.
3. B&G relief valve, set at 30 psi.
4. The boiler.
5. Watts relief valve, set at 30 psi (Btu rated).
(Nos. 2 and 3 are part of a combined set.)
Doug