For water, steam, hot oil medium; Normal maximum speed: 100RPM; maximum pressure: 2.0Mpa. Normal maximum temperature: 220 ℃; high temperature maximum temperature: 250 ℃. Maximum speed: 220RPM; maximum pressure: 2.5Mpa using sphere of non-equilibrium structure, the concentricity without required equipment that can automatically adjust the concentricity. Directly connected to the outer tube or roller dryer on the main rotating parts; precision processed after plating treated spherical outer tube, cover the bottom plane and spherical graphite impregnated sealing ring, together form a reliable dynamic seal friction . When the medium flows through the sealing ring and oil-free bearings, to form a thin film to enhance the sealing and lubrication, thus reducing wear and extending the service life (the normal type of product shelf life of 180 days, high temperature protection Shelf life 365 days).