NFPA 14, 2010, 7.2.4 (4) requires a bypass across a prv. Is it only when multiple smaller prv's are used instead of a larger prv, or whenever any prv is used?
My application is there is a prv at the floor control stations supplying combined sprinkler/standpipe. Would this prv need a by-pass? The other question is will every prv need control valves upstream and downstream? I know it is good engineering practice to have the valves and by-pass, but very often there is not much space inside the stairs. What is the general industry practice? Thanks, Tony
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