The gas spring 1372540 is an elastic element with gas and liquid as the working medium. It is composed of a pressure tube, a piston, a piston rod and a number of connectors. Its interior is filled with high-pressure nitrogen. Since there is no through hole in the piston, the gas pressure is equal at both ends. The cross-sectional area on both sides of the piston is different, one end is connected with the piston rod and the other end is not, under the action of gas pressure, the pressure to the side of the small cross-sectional area is generated, that is, the elasticity of the gas spring, the size of the elasticity can be set by setting different nitrogen pressure or different diameter of the piston rod. Unlike mechanical springs, gas springs have an almost linear elastic curve. There are also universal gas spring , mainly for support.