Three-eccentric center butterfly valve

The utility model belongs to the technical field of three-eccentric center butterfly valves, and particularly relates to a three-eccentric center butterfly valve which comprises a valve body, a transmission box, a hand wheel, a valve rod, a valve plate, a sealing ring, a replacing mechanism and a limiting mechanism, the transmission box is fixedly connected to the valve body, the hand wheel is arranged on the transmission box, the valve rod is arranged in the valve body, the valve plate is fixedly connected to the valve rod, and the valve plate is fixedly connected to the sealing ring. A sealing ring is connected to the outer side of the valve plate in a sliding mode, a replacement mechanism is arranged on the valve plate, a limiting mechanism is arranged on the transmission box, and the sealing ring makes contact with the valve body. The clamping block, the pushing plate, the limiting cover and other structures are additionally arranged on the valve plate, the clamping block can be pushed to slide into the l