Sleeve-type connecting tube internal-mouth open-close device for pressure container

The utility model relates to a sleeve-type opening and closing devices for the internal openings of the connecting tubes of pressure containers, which is characterized in that an opening at the bottom of a sleeve of a gland bush is connected with an internal opening of a connecting tube of a pressure container; the lower half of the circumference of the opening is provided with a medium circulation hole; a piston gland bush is sheathed in the sleeve; a sealing ring is arranged between the piston gland bush and the sleeve; the upper opening of the gland bush is covered with a spring seat; both heads of a closed spring prop up the spring seat and the inner bottom of the piston gland bush; a pull rod which is connected with the center of the piston gland bush extends out of the sleeve and is connected with a pull rope; the pull rope is connected with an adjusting screw; the adjusting screw is tightly clamped in a stuffing, the gland bush, and a nut of a clamping seat of the adjusting screw outside the shell wall on the other side of the pull rod corresponding to the pressure container. The utility model can close the connecting tube to prevent an accident from happening when the pressure container, the connecting tube with a one-time valve, and the one-time valve generate medium leakage.