Valve plate self-supporting type double-gate valve

The utility model relates to a valve plate self-supporting type double-gate valve which comprises a valve body, a valve rod and a valve plate assembly, the valve rod and the valve plate assembly are arranged in the valve body, and the valve plate assembly is connected with the lower end of the valve rod. The valve plate assembly comprises a main gate plate, an auxiliary gate plate, a connecting frame and a connecting block, a first inclined face is arranged on the main gate plate, and a second inclined face capable of being matched with the first inclined face is arranged on the auxiliary gate plate. The form of the self-supporting type parallel double-gate valve plate is adopted, and the main gate plate and the auxiliary gate plate can be folded inwards or expanded outwards during movement under the action of the inclined surfaces of the main gate plate and the auxiliary gate plate and are matched with the soft valve seat to realize closing and sealing of the gate valve; the main flashboard, the auxiliary fl