Sealing device for pressure vessel

The utility model discloses a sealing device for a pressure vessel. Pressure tank, the upper end of the pressure tank is fixedly connected with a sealing pipe; a closing cover is arranged at the upperend of the sealing pipe; a communicating opening is formed in the upper end of the sealing pipe; the left portion and the right portion of the upper end of the closing cover are each connected with an auxiliary rod in an inserted mode, a piston plate is arranged at the lower end of the closing cover, a piston ring is movably connected to the middle of the outer surface of the piston plate, the lower portions of the auxiliary rods are jointly connected with a sealing cover, and a rubber ring is arranged in the middle of the inner wall of the sealing pipe. According to the sealing device for the pressure vessel, due to the fact that the closing cover, the piston plate, the sealing cover and other structures are arranged in the sealing pipe, the sealing pipe can be effectively closed in theusing process, the sealing