Floating double disc flat gate valve

The utility model provides a floating double disc flat gate valve which comprises a valve body, a valve seat, a valve plate assembly, a valve plate anti-fouling ring, a valve rod, a valve deck and padding. The valve body is fixedly connected with the valve deck, a valve cavity is formed inside the valve body, the valve seat is fixedly arranged on the valve body, the upper end of the valve plate assembly is fixedly connected with the valve rod, a through hole is formed in the lower portion of he valve plate assembly, the bore diameter of the through hole is the same as the bore diameter of the valve seat, a groove is formed in the inner wall of the middle position of the through hole, and the valve plate anti-fouling ring is embedded in the groove of the valve plate assembly. According to the floating double disc flat gate valve, due to the fact that the valve plate anti-fouling ring is additionally arranged, impurities in a pipe are prevented from entering the space between two valve plates and the valve cavi