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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, Water

250 PSI (Water)
175 PSI (Steam)
100 PSI (Hot Oil)


600º F(Hot Oil)
378º F(Steam)

700 RPM

1/4" to 3" NPT
BSP Threads Available

Cast Iron Housing with Stainless Steel or Plated Sleeve
Steel Shaft

Mono Flow and Dual Flow  Configurations Available

*See performance charts for details

Features & Benefits
  • Superior Sealing Performance - Bellows Sealing System provides superior sealing performance throughout the wear life of the Rotary Union
  • Designed For Dirty Media Applications - Debris in contaminated media will not be captured in the Bellows Sealing System, which reduces clogging
  • Maintenance Free - 9000G is maintenance free because there is no rolling element bearing, therefore no lubrication is required
  • High Temperature Applications - Offers the same design as the standard 9000 Series, but utilizes carbon graphite bearings for high temperature applications
  • Ideal For High Temperatures - The thrust collar allows for thermal expansion, making this an ideal union for high temperature, general purpose applications

  • Flanged mounted units available - Consult the factory