Just a guess (perhaps educated but a guess nonetheless) but I'd think any flow whatsoever from the non-flowing line would be back towards the flowing line and only momentarily until everything equalized. If the paddle moves at all it would be the wrong direction and the flow switch mechanism would remain in its resting position.
Ron Greenman [email protected] 253.576.9700 The Universe is monstrously indifferent to the presence of man. -Werner Herzog, screenwriter, film director, author, actor and opera director (1942-) On Tue, Nov 6, 2018 at 1:09 PM Fpdcdesign <[email protected]> wrote: > This is being done per the 2010 edition before that text was added. The > only requirements I see in that version for a check valve is if you are > connecting to a combination sprinkler standpipe riser (and if the zone > valves are interconnected). > > My question was more of an operational one as opposed to a Code one. Are > two flow switches on different branches in close proximity subject to > simultaneous operation? > > Todd G Williams, PE > Fire Protection Design/Consulting > Stonington, CT > 860-535-2080 (ofc) > 860-553-3553 (fax) > 860-608-4559 (cell) > > > On Nov 6, 2018 at 3:48 PM, <John Denhardt <[email protected]>> > wrote: > > I agree. Check valves are required. > > John > > John August Denhardt, P.E. > Strickland Fire Protection > > On Nov 6, 2018, at 3:41 PM, Mike Stossel <[email protected]> wrote: > > If I am understanding you question correctly, check valves are required. > > > > *8.16.1.5 Floor Control Valve Assemblies.* > > *8.16.1.5.1* *Multistory buildings exceeding two stories in height shall > be provided with a floor control valve, check valve, main drain valve, and > flow switch for isolation, control, and annunciation of water flow on each > floor level. > > > > Mike Stossel *SET* > > <image002.png> > > 36 Barren Road > > East Stroudsburg, PA 18302 > > Office: 973-670-2627 > > [email protected] > > > > *From:* Sprinklerforum <[email protected]> *On > Behalf Of *Fpdcdesign > *Sent:* Tuesday, November 6, 2018 3:38 PM > *To:* Sprinklerforum <[email protected]> > *Subject:* Back to back floor controls. > > > > I am working on an existing two story plus attic wood frame building. The > engineer is requiring zone control assemblies (butterfly valve plus riser > manifold) for every level including the attic. I have designed it so there > is a bull head tee at the top of a 4” riser with the assemblies on either > side of the tee. Given that the flow switches are going to be in close > proximity, should I install a check valve between the butterfly valve and > the manifold? > > > Todd G Williams, PE > > Fire Protection Design/Consulting > > Stonington, CT > > 860-535-2080 (ofc) > > 860-553-3553 (fax) > > 860-608-4559 (cell) > > _______________________________________________ > Sprinklerforum mailing list > [email protected] > > http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org > > _______________________________________________ Sprinklerforum mailing > list [email protected] > http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org > > _______________________________________________ > Sprinklerforum mailing list > [email protected] > > http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org >
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