Pressure balance type gas cylinder

The utility model discloses a pressure balance type gas cylinder, relating to disposable gas cylinders and the field of medical asepsis oxygenation pressure transfusion; the utility model aims at the technical problem that gas inflation in a pressure balance can not be obtained in known oxygen cylinder which can realize releasing gas flow quantity by regulating the flow quantity of an airway. The utility model has the technical proposal that the lower part of a handwheel is provided with a preforming and a valve core; a movable cabin is arranged between the preforming and the valve core, and one side of the movable cabin is provided with a gas discharge duct. When the utility model is used, the handwheel is rotated in a clockwise direction, and a thimble is driven by the handwheel to push downwards; a hole is penetrated on a top cap by the thimble, and gas in the cylinder can be discharged; the gas flows to the valve core and the gas discharge duct of the preforming via a liner and a pad, and the gas is transported to a gas needing part via a gas supply connecting port of the handwheel. When pressure in a container of the gas needing party is increased, the valve core is bulged, and accordingly, a gas passage can be blocked; the gas in a cylinder body can be in a cut-off state. When pressure of the gas needing party is dropped, the valve core is reset to an original state. The pressure balance type gas cylinder is also suitable for cylinders of other gases.