Energy-saving cast iron flap valve

The utility model discloses an energy-saving cast iron flap valve which comprises a valve seat, the top of the valve seat is fixedly connected with a movable structure, the bottom of the movable structure is movably connected with a sealing structure, the interior of the valve seat comprises a base layer, an acid-resisting layer and an anti-corrosion layer, the base layer is located at the top ofthe acid-resisting layer, and the acid-resisting layer is located at the top of the anti-corrosion layer. According to the utility model, the valve seat, the movable structure, the sealing structure,the base layer, the acid-resistant layer and the anticorrosive layer are arranged; the cast iron flap valve has the advantages of being good in sealing effect and long in service life. Side leakage ofwater flow and garbage is prevented; circulation of sundries such as garbage is facilitated; the service life of the cast iron flap valve is prolonged, meanwhile, the problems that an existing cast iron flap valve is poor in s