Double-decker heavy hammer flap valve adopts steel plate welding structure, with heavy rod self-resetting mechanism, tight structure, smooth and reliable work, double-decker heavy town plate ash unloading valve is based on the mushroom head type, conical valve and other structural ash unloading between the existence of the “large volume, high leakage rate, the valve head is easy to wear and jamming, easy to burn out the heart of the machine, in the industrial production process can not be entered into the automatic control, and so on, and other shortcomings of research and development. A simple structure, novel design of the updated products.