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]' 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
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