Gas springs are gases and liquids as the working medium of a flexible component, the pressure tube, piston, piston rod and a number of connected pieces of composition, its internal filled with high-pressure nitrogen, due to the internal piston has holes in the piston ends of Gas pressure equal to, but different cross-sectional area on both sides of the piston, a piston rod and the other end of the termination are not, in the gas under pressure, resulting in small cross-sectional area to the side of the pressur