1. Choose the hardness of the hydraulic cylinder seal from 92 to 97 degrees. The higher the hydraulic cylinder pressure, the greater the hardness of the seal.
2. The linear velocity of the lip of the seal must meet 0.5 m/s.
3. The temperature resistance of the sealing parts should meet the temperature of -30℃～110℃. Because the temperature of the contact surface of the seal lip is higher than the temperature of the hydraulic oil, the seal should be resistant to a high temperature of 110°C; and the temperature in some places is around -30°C, so the choice of seal should be resistant to low temperature of -30°C.
4. To choose special seals, such as shaft seals, you can only choose special seals for shafts. For the piston seal, only special seals for the piston can be selected, not dual-purpose seals for shaft and piston. Because the bottom width of the dual-purpose seal is smaller than the bottom width of the special seal. When the hydraulic cylinder is under high pressure, the bottom of the dual-purpose seal has a large deformation, and the special seal has a wider bottom at the same pressure, and the compression deformation is small, and the possibility of being squeezed out by the piston rod becomes less. The press cylinder gasket should be added to the bottom of the hydraulic cylinder seal. Why add a gasket and what is the hardness of the gasket? Since the oil hydraulic cylinder pressure is above 25Mpa, the height of the seal determines the amount of deformation at the bottom of the seal, that is, the size of the extrusion gap, because the gasket also has hardness and deformation. Adding the gasket is equivalent to reducing the deformation of the seal. When the hydraulic cylinder makes the seal at high pressure, the bottom of the hydraulic cylinder reduces the possibility of friction with the piston rod or the inner wall of the hydraulic cylinder, thereby reducing the root of the seal from being pulled out by extrusion And the chance of damage. The relationship between gasket hardness and pressure is that the greater the pressure, the greater the hardness.