The double flap valve is an ideal ash discharge valve in metallurgical, nonferrous metal and environmental protection dust removal equipment. Double-deck heavy hammer dump valve is a chain conveyor driven by the transmission rod through the crank, cam and connecting rod drive up and down drive shaft rotation, interactive open, through the equipped lever system or stretching springs, ensure that the feeder valve reliable reset, double-deck electric air-lock dump valve to prevent wild wind blowing, double-deck electric power