FEATURE1.Reduced Pressure Principle Backflow Preventer,Its Standard’s Release Pressure Is 14kpa.Completely Accord With AWWA C511-1997 & GB/T 25178-2010.2.Dual Independent & Quick-Closed by Spring Check Valves+Reduced Pressure Chamber+Release Valve+Testable Holes.3.Prevent  Backflow From Siphon & Back Pressure.4.Use In Continuous Water Flow.5.Prevent Backflow From Poison.6.Maintainance On Line.7.Spring Pre-tightening Force Of The First Check Valve Can Keep Un-leaking From 2m H2O Column.8. Spring Pre-tightening Force Of The Second Check Valve Can Keep Un-leaking From 0.7m H2O Column.9.The Dynamical Headloss Is Approx.2.7m-3.5m.

BACKFLOW PREVENTER