Multi-passage rotary unions are used when more than one media are used simultaneously. A multi-passage rotary union provides multiple seals between stationary connections and rotating equipment, such as a drum, index table, clutch, or spindle. The multiple independent passages permit the flow of the same or different media into and/or out of the rotating equipment. Power and fluid transfer media typically used with these multi-passage rotary unions include hydraulic fluids, cutting fluids, air, or inert gas. Other media could include steam, water, thermal oil, and coolant.
The multi-passage rotary union provides multiple, independent passages, each with a different rotating feed point, but all in the same axis. In most cases, each passage requires isolation from other passages especially when the different media cannot mix. The key to reliability in these cases is dependable sealing technology. The sealing technology selected is dependent on the media and operating conditions, such as temperature, pressure, speed, and passage size. From mechanical seals to the DuraSeal™ high-performance elastomeric sealing materials, Kadant Johnson designs the optimal solution for your application to ensure reliability is attained.