NFPA 20 Section 220.127.116.11 (2016 Edition) requires a listed OS&Y gate valve to be installed in the suction pipe, but the annex of NFPA 20 suggests it should be as far as practical from the pump suction.
Would a control valve (OS&Y) on the backflow preventer meet this control valve requirement of Section 18.104.22.168?
Assuming a city water supply, the backflow preventer control valve is listed for fire protection, there is still a valve'd bypass connected between the backflow preventer and pump suction, and the backflow is located a minimum of 10-pipe diameters from the suction flange.
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PE PREP SERIES