The RF6 is a rotary flanged seal. The flanged heel helps to prevent rotation of the sealing element by being clamped down within the groove. It is an extremely low friction seal and performs very well in high viscosity applications, such as preventing leakage of drilling mud from the top drive assembly.
The RO9 is a double acting, O-ring energized, rotary seal. This low friction PTFE rotary seal is mainly used in applications with alternating pressures from one side of the seal to the other, such as in hose reels, swivel joints, rotating track rings and machine tool hydraulics. Can seal for both internal and external applications.