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ROTARY UNION ® transfers media (water, steam, air, oil, hydraulic fluid, etc) from a stationary source to rotating machinery, such as a drum or an indexing table. They are used in process industries such as; paper, printing, rubber and plastics, textile and chemical. Rotary Unions are also used on cranes, machine tools and many other applications. Duff-Norton Rotary Unions are used to provide heating or cooling media like steam, hot oil, water or coolant to control the surface temperature of a drum or roll, to transfer air or hydraulic fluid to moving components or to add fluids to mixers while in motion. Rotary unions, rotary joints and rotating joints ranging up to 750 psi and up to 5,000 RPM are available.
Selection Guide
How do I choose the best Rotary Union for my process?


Tell us about your process. We need to know:

  1. Type of fluid or gas to be conveyed (Media)
  2. Pressure (PSI)
  3. Temperature (ºF)
  4. Speed (RPM)
  5. Shaft connection (Thread size and type or flange size)
  6. Flow rate of media (GPM)
  7. Flow passage - mono flow or dual flow (if dual flow: stationary or rotating siphon pipe or tube)
Rotary Union: Selection Guide Selection Chart