The utility model relates to a valve technical field is a broken carbide feed bin valve formula feeding valve, and it includes valve buckle, lower valve buckle, supporting cylindrical, hopper and valve plate, upward valve buckle and lower valve buckle are square frame, the square barrel of supporting cylindrical for matching with last valve buckle and lower valve buckle, and the hopper is big -end -up's square cavity, and the valve plate is the square board that the lower port with the hopper matches. The internal and external network physical isolation data exchange device is reasonable and compact in structure, high durability and convenient use, through the switching form that changes the valve, form decurrent sealed face between the contact surface of terminal surface and valve plate under the hopper, the closed better sealed effect of arriving of the younger generation of port under valve plate and hopper, it overflows to reduce nitrogen gas, reduce the oxygen content in the feed bin, the nitrogen gas recoverable amount that increases in the feed bin can effectively reduce carbide emergence morals and manners reaction, reduce the acetylene content in the feed bin, the security of feed bin improves, the valve plate is closed from bottom to top, the jamming of carbide material piece can effectively be avoided to closed in -process.