Suction control valves are actually installed on the discharge of the pump between check and test tee, sensing line runs to suction.
TD Unless an applicable code supercedes NFPA 20 they're allowable in new installations. From NFPA 20 2016: 4.16.10.1 Suction pressure regulating valves that are listed for pump service and that are suction pressure sensitive shall be permitted where the authority having jurisdiction requires positive pressure to be maintained on the suction piping. My supervisor said that is for existing systems. We are installing new fire pumps. Tim I can't do the subject justice of explaining how they work. But I'm curious why you wouldn't use the industry standard solution to this concern, a low suction control valve? EG http://www.cla-val.com/fire-protection-pump-suction-control-valve-p-188-l-en .html
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