A four-inch standpipe riser connects to a horizontal manifold featuring a grooved butterfly valve followed by a grooved pressure reducing valve set to 165 PSI, which serves as the source point for all hydraulic calculations. A grooved check valve precedes a grooved-by-grooved riser manifold equipped with a flow switch and pressure gauge before feeding the sprinkler system. A pipe test and drain assembly branches off the manifold to route toward the drain riser.
GROOVED BUTTERFLY VALVE GROOVED PRESSURE REDUCING VALVE SET TO 165 PSI (NOTE ALL HYDRAULIC CALCULATIONS USE PRV AS SOURCE POIINT) GROOVED CHECK VALVE GxG RISER MANIFOLD W/ FLOW SWITCH & GAUGE TO SPRINKLER SYSTEM PIPE TEST & DRAIN TO DRAIN RISER 4" STANDPIPE RISER
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