National standard bladder accumulator

Inner space of accumulator is divided into two parts by bladder: nitrogen is filled in bladder and hydraulic oil is filled the bladder. When hydraulic oil is pressed into accumulator by hydraulic valve, bladder deform by the pressure, volume of gas decreases with the increasing of pressure. Hydraulic oil is stored gradually. If hydraulic system need hydraulic oil to work, accumulator discharge the hydraulic oil and compensate the system energy.