The hardness and pressure of the sealing ring are related to the smoothness of the sealing surface. Simply speaking, the higher the hardness of the sealing ring, the stronger the compression resistance and the better the wear resistance. The surface finish is low, and the hardness of the sealing ring is low, but it should be noted that the hardness of the sealing material will decrease with the increase of temperature.
The hydropneumatic seal obtains the sealing ability by the resilience generated by itself in the sealing groove, so the permanent deformation of the sealing material should be small and the resilience should be high. The permanent deformation of the material is related to temperature, and both low temperature and high temperature will increase the possibility of permanent deformation.