Introduction Hydraulic equipment includes engineering hydraulic cylinder, hydraulic cylinder for metallurgical equipment, hydraulic cylinder for industry and thin hydraulic cylinder, etc. DGR-CD250 series used in the metallurgical equipment is a double acting hydraulic cylinder, with a cylinder diameter generally ranging from 40 to 320mm and a working pressure of 25MPA. Its installation methods include: A. Cylinder bottom sliding bearing; B. Cylinder bottom ball hinge bearing; C. Cylinder head flange; D. Cylinder bottom flange; E. Middle trunnion; F. Various types such as base installation. The installation of connected dimensions shall comply with the provisions of IS06021/1-1981. The piston rod end thread also complies with the provisions of GB2350-80. Suitable for metallurgical equipment with a working temperature of-40-120℃ and a working medium of hydraulic oil and emulsion. Metallurgical hydraulic cylinders are devices use…