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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, Hot Oil, Air

150 PSI(Water)
100 PSI(Air & Hot Oil)


375º F(Water)
550º F(Hot Oil) - consult factory for applications exceeding 375ºF

500 RPM

2" to 4" ASA Flange

Cast Iron Housing, Steel Shaft

Mono Flow and Dual Flow Configurations Available

*See performance charts for details

Features & Benefits
  • Heavy Duty Design - Designed with two ball bearings spaced to withstand radial and thrust loads
  • Easy Maintenance - Designed with an integral flange that allows repairs without removing the housing from the machine
  • No Leakage in Tough Applications - Compression springs in the 2000 Series provide even loading across the seal surfaces to maintain zero leakage even in low pressure applications
  • Easy Mounting - The flange attaches directly to the machine journal, providing inherently concentric mounting, minimizing overhang, and partially relieving bearing load to increase service life