Minimum requirement on a standard DCVA is 1 psi drop across each check, factory curve is usually higher but at less than 1 you have to replace the check valve, unless you are using a FP DCVA, they are allowed to go to 0.5 psi but I rarely see anyone using them
Thank You Brett Peters PFPS Ltd (780) 777 0568 Sent From My iPhone On Thu, Aug 13, 2026 at 8:09 AM Travis Mack <[email protected]> wrote: > I think the question revolves around setting of PRVs. If you have a > reduction of 4 psi static from a backflow device, that is ±9' and may be > enough to save you a PRV. I have always erred on the side of caution and > not taken the reduction in static at zero flow. But I am eager to hear > from the industry how this is out in the field. > > > > Travis Mack, SET > > *MEPCAD* | Instructor / Training > > 181 N. Arroyo Grande Blvd. #105 > <https://www.google.com/maps/search/181+N.+Arroyo+Grande+Blvd.+%23105?entry=gmail&source=g> > I Henderson, NV 89074 > > *www.mepcad.com* <http://www.mepcad.com/> | 303-923-8215 > > *Email: [email protected] <[email protected]>* > > > > *AutoSPRINK | AutoSPRINK FAB | AutoSPRINK RVT | AlarmCAD* > > > > *Academy of Fire Sprinkler Technology *| Executive Director > > 101 S Main Street, Suite 001, Decatur, IL 62523 > <https://www.google.com/maps/search/101+S+Main+Street,+Suite+001,+Decatur,+IL+62523?entry=gmail&source=g> > > ------------------------------ > *From:* Henry Leon <[email protected]> > *Sent:* Thursday, August 13, 2026 8:57 AM > *To:* Discussion list on issues relating to automatic fire sprinklers < > [email protected]> > *Subject:* [Sprinklerforum] Re: static pressure loss through backflow > > You don't often get email from [email protected]. Learn why this > is important <https://aka.ms/LearnAboutSenderIdentification> > > Hi Matt, > > Yes they typically impact the static pressure which means there is an > impact at very low flows which becomes important in 13R applications. > > > > Henry Leon > > > > *From:* Matt Grise <[email protected]> > *Sent:* Thursday, August 13, 2026 9:06 AM > *To:* Discussion list on issues relating to automatic fire sprinklers < > [email protected]> > *Subject:* [Sprinklerforum] static pressure loss through backflow > > > > > > do backflow preventers typically reduce static pressure? The charts > provided with BFP's do show a loss at 0gpm, but is loss the same when flow > is increasing and decreasing? I usually apply the pressure loss from a BFP > at a flowing condition, so I'm not sure how they affect static condition. > > > > Anyone know? > > > > Thanks! > > > > Matt Grise > > _________________________________________________________ > SprinklerForum mailing list: > https://lists.firesprinkler.org/list/sprinklerforum.lists.firesprinkler.org > To unsubscribe send an email to > [email protected]
_________________________________________________________ SprinklerForum mailing list: https://lists.firesprinkler.org/list/sprinklerforum.lists.firesprinkler.org To unsubscribe send an email to [email protected]
