Marine bronze ball valve

The utility model discloses a bronze ball valve for a ship. The bronze ball valve comprises a ball valve middle connecting body and a left flange plate connecting assembly at the left end of the ball valve middle connecting body. A right flange plate at the right end of the ball valve middle connector is connected with the main body; the outer side of the right flange plate connecting body is sleeved with a sleeving sealing ring, a rubber built-in air bag ring is arranged in the middle of the sleeving sealing ring, and the rubber built-in air bag ring can bulge after being inflated. When the size of the rubber built-in air bag ring is increased, the gaps between the left flange plate connecting assembly and the right flange plate connecting assembly and the connecting pipe flange plate are extruded, attached and sealed; by adding the sleeving sealing ring with the inflatable rubber built-in air bag ring, the left flange plate connecting assembly and the right flange plate connecting assembly can be connected