鸿瑞机械。 HongRui company.   Our company makes each kind of industrial used valves , Mechanical spare parts , Train fitting parts ,Railway industrial supplies and Rubber products。  Products include; Double  disc wafer swing  check  valve(Double  Door check valve)Single Door Valve, (Single disc swing  check valve)Butterfly  valve ,   Lift  check  valve 3-way ball valve, Ball  check  valve Flarye  muffing  check  valve, flanged  joint,non-slam check valve ( Wafer silent check valve)Material;( Drawgear parts,  Body castings),Stainless  steel    316 ss   304ssCasting    steel     45#      GG25