Multi-Passage Rotary Unions
Multi-passage (MP) rotary unions are used when more than one media are used simultaneously. An MP 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 or out of the rotating equipment. Power and fluid transfer media typically used with multi-passage rotary unions include hydraulic fluids, cutting fluids, air, or inert gas. Other media include steam, water, thermal oil, and coolant. When electrical power, signal, or data transfer is combined with
Standard MP rotary unions are available in 2-, 4-, 6-, and 8-passage configurations and are suitable for vacuum and bidirectional pressures. MP rotary unions can be designed with up to 36 passages. Media types typically include oil, air, water, and coolant.
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Over-the-shaft (OTS) rotary unions are used with roll journals that contain internal passages and require fluid conveyance through the journal into the roll. An OTS rotary union seals around the rotating journal and transfers fluid into and out of the passages.