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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, Air

750 PSI (water)
120 PSI (Steam)
100 PSI (Hot Oil)
300 PSI (Air)


300º F (water), 350º F (Steam)
395º F (Hot Oil)

1,000 RPM (NPT)
3,600 RPM (MT)

1/4" to 2" NPT
BSP & BSPP & Metric Threads Available

300 Grade Stainless Steel

Mono Flow and Dual Flow Configurations Available

*See performance charts for details

Features & Benefits
  • Corrosion Resistant - 300 Grade stainless steel construction
  • Long Service Life - Two precision bearings keep the 5000 Series seal faces perfectly aligned to extend the life
  • Balanced Mechanical Seal Design - Allows for optimal operation with a wide variety of media
  • Replacement Cartridge - Integrated cartridge design makes repairs fast and easy reducing maintenance cost

  • Dual Flow Optional with the addition of an elbow
  • 5000 Series Seal Design (Standard)- Carbon graphite against a ceramic coated steel seal design offers long life
  • 5000 T Series Seal Design (Consult Factory) - Carbon graphite seal ring against a tungsten carbide face ring design will offer longer wear life where dirty media is used
  • 5000 ASM Series (Consult factory) - Tungsten carbide face ring against a siliconized graphite seal ring design is used for abrasive applications