Rotary Unions for Driven Roll Applications

Challenge: A continuous caster at a U.S. steel mill, producing wide steel slabs, required drive rolls of certain segments to be driven from each end. The rotary unions on these rolls were experiencing continual leakage and required frequent repair.

Solution: Kadant Johnson designed the Over-the-Shaft™ (OTS) rotary union for machinery that requires cooling on the drive side of driven rolls or for rolls that cannot accept an axially-mounted rotary union for other reasons. OTS rotary unions can be applied to water, hydraulic, or air applications.

Results: The U.S. steel mill replaced its original rotary unions with OTS rotary unions and has reported no leakage and reduced maintenance.