Wafer butterfly check valve is used for preventing the back-going of medium in pipelines and controlling medium flow in single direction. This valve possesses the characters of working reliability good seal function, simple structure, short connecting length and so on. Feature: 1) Standards: a) Manufacture: E101 JB/T3595 DL/T531 b) Face to face/end to end dimensions: E101 JB2766 GB/T15188.1 c) Pressure / Temperature: E101 JB/T3595 d) Testing and inspection: E101 JB/T9092 2) Body materials: CI, DI, WCB, SS Disc: DI, SS304, SS316, Aluminum Bronze Stem: WCB, SS416, SS304, SS316 Seat: NBR, EPDM Spring: 60Si2Mn、304、306 3) Nominal Diameter: DN40~600