Victaulic style 707C or the NIBCO equivalent must be used. I do not believe any other manufacturers make a Listed normally closed monitored butterfly valve. This is a NFPA 20 requirement.
John John August Denhardt, P.E. Strickland Fire Protection On Jun 22, 2017, at 2:34 PM, Steve Leyton <[email protected]<mailto:[email protected]>> wrote: Are you asking about valves that are described in a tech data sheet as a “normally closed butterfly valve”? Like in Nibco’s catalogue, you have to order the N suffix or something like that? Assuming yes, all that means is that it’s a regular, everyday fire protection butterfly valve but the tamper switch kit is factory-wired for NC service. So if your question is about the tamper switch, yes you want normally closed ones for a flow meter/test bypass. I think. SL From: Sprinklerforum [mailto:[email protected]] On Behalf Of Mark Phillips Sent: Thursday, June 22, 2017 11:16 AM To: '[email protected]<mailto:[email protected]>' Subject: Fire pump flow meter butterfly valves I keep going back and forth on the answer so I am asking for help Does the flowmeter bypass butterfly valves have to be normally closed monitored valves? Or can they be just be monitored butterfly valves. Thanks in advance Mark _______________________________________________ Sprinklerforum mailing list [email protected]<mailto:[email protected]> http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org
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