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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.

Steam, Hot Oil

175 PSI (Steam)
100 PSI (Hot Oil)


450º F(Steam)
600º F(Hot Oil)

600 RPM

1/2" to 4" NPT
BSP & ISO228 Available
Quick Release

Cast Iron Housing with Stainless Steel Sleeve
Steel Shaft with Hardened Nickel Plating

Mono Flow and Dual Flow  Configurations Available

*See performance charts for details

Features & Benefits
  • Ideal For Steam Applications - Designed for operation in a variety of steam applications
  • Safety - An anti-torque lug prevents rotation of the housing while in operation
  • No Lubrication Needed - The special carbon graphite bearing is lubricated by the process fluid and requires no additional lubrication
  • Hot Oil Applications - 8000HO offers the same design features as the standard 8000 Series but with a special high temperature seal ring for hot oil applications
  • Stainless Steel Insert - The stainless steel housing insert in the 8000T Series makes this joint a favorite in the textile industry