Low-temperature butterfly valve with manhole

A liquid inlet and a liquid outlet are formed in the two sides of a valve body correspondingly, a first connecting ring is welded to the edge of the inner wall of the liquid inlet, a second connecting ring is welded to the edge of the inner wall of the liquid outlet, and a plurality of mounting holes are formed in one side of the first connecting ring and one side of the second connecting ring correspondingly; a blocking mechanism is arranged in the valve body, sealing mechanisms are arranged on the two sides of the inner wall of the valve body, each sealing mechanism comprises a supporting ring, a fixing ring and a flexible sealing ring, the fixing rings are connected with the inner wall of the valve body through bolts, and a plurality of buffering pads are arranged between the supporting rings and the fixing rings. According to the butterfly valve, the connecting position of the butterfly valve and the pipeline can be sealed, so that liquid can be conveyed conveniently, and the situation that due to the fac