By combining 3 types of valves in one assembly, Triple Duty performs all 3 functions that are normally required on discharge side of hydronic pump systems. Calibrated balance valve provides precise flow with maximum range of control (8-9 turns). Nonslam check valve assures positive shut-off free of water hammer or valve chatter. Shut-off valve includes calibrated nameplate and memory button allowing entire valve to return to its initial balanced position after shut off.