Light-weight steel cylinder capable of automatic controlling internal pressure

The utility model relates to a light steel bottle capable of automatically controlling internal pressure. The utility model is characterized in that a valve core is composed of two parts, a lower valve core forms a cylindrical shape, and the upper end of the lower valve core is provided with a necking hook; an upper valve core also forms cylindrical shape, the diameter of the lower part of the upper valve core is thicker, and the lower part of the upper valve core is provided with a T-shaped slot; the hook is sheathed in the T-shaped slot, and the upper part of the upper valve core is provided with a screw thread rod which is provided with a screw thread hole; the opposite side of an externally connected bell mouth is provided with an interface of a safety valve, and the interface of a safety valve is provided with a safety valve; the safety valve comprises a rubber film, a bracket, a spring arranged in the concave slot, and a fixing sleeve, and the bracket is provided with a via hole on the center and is provided with an annular concave slot on one end, and the spring is arranged in the concave slot; the fixing sleeve which is provided with a venting hole and is butted with the other head of the spring and a valve body 11 are fixed. The utility model has the advantages of light weight, convenient transportation, and good sealing performance.