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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, Air, Hydraulic Fluid
Non-Toxic Gasses, Oil
  435 psi
(725 psi with seal option E2)
320º F   5,000 RPM
1/4" to 1" NPT
MT & Metric
BSP & BSPP Available
  Aluminum Housing with A Stainless Steel Shaft. Also Available in All Stainless Steel Construction.
Mono Flow and Dual Flow Configurations available   *See performance charts for details
Features & Benefits
  • Suitable for a wide range of applications.
  • Mono flow models available in sizes from 1/4" to 1".
  • Dual flow models available in sizes from 1/2" to 1".
  • Seal Option E1 (Comes Standard) The carbon graphite seal ring against ceramic face ring design can be used at pressures up to 435 psi.
  • Seal Option E2 (Optional) The stainless steel seal ring against ceramic face ring design can be used at pressures up to 725 psi.