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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.

Water, Steam, Hot Oil

250 PSI


375º F

700 RPM

1/4" to 3" NPT
BSP & ISO228 Flanged Available

Nickel Treated Carbon Steel Construction. Stainless Steel Models also Available.

Mono Flow and Dual Flow Configurations

*See performance charts for details

Features & Benefits
  • Advanced Sealing System - Bellows sealing system provides superior sealing performance throughout the wear life of the Rotary Union
  • Superior Alignment - Dual bearings available in all sizes over 1 1/4" to provide superior alignment
  • Resists Debris Build-Up - Debris in contaminated media will not be captured in the Bellows Sealing System, which reduces clogging

  • Flanged Mounted Units Available - Consult Factory