Product Type: Check ValveProduct Name:Tiny Drag Slow Shut Check ValveProduct Details:Place of Origin: ChinaCertification: ISO9001-CEProduct DescriptionDN100 Slow Opening Fast Shut Check Valve:1. Product Introduction:(1). Model: DY30BX(2). Nominal Diameter: DN40 mm - DN800 mm(3). Pressure: 1.0 Mpa to 2.5 Mpa(4). Media: Water(5). Application: Water System, Dirt Water System.2. Material Introduction Chart:Valve Body, Valve Bonnet : Cast Iron, Cast Steel, Stainless Steel :Valve Stem  :Chromium Stainless SteelValve Disc :  Carbon Steel, Stainless Steel, Buna-N RubberO Type Ring : Buna-N RubberO Spring  :Stainless Steel