DF type floating seal is widely used.

DF type floating seal is an oil seal product with special-shaped ring as the second sealing element. It has the characteristics of simple structure and reliable design. It is widely used in tunnel shield machinery, agricultural machinery, mining machinery, etc.
Features:
The special-shaped ring is used as the second sealing element instead of the O-ring
The seal is composed of 2 metal seals, which are mounted face to face in separate chambers, and the elastomer element keeps the seal centered in the chamber. There is a cone in the chamber and on the outer diameter of the seal. Due to the different taper of the cone, the slope increases with the depth of the hole. The shape of the chamber is usually processed by a CNC machine tool.
product advantages:
Simple structure and reliable design
Good sealing performance, which can effectively prevent the intrusion of external dirt, dust, water and abrasives and prevent internal oil or grease leakage, high cost performance, long service life, self-centering compensation for shaft eccentricity or misalignment, maintenance-free, and easy assembly.