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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, non-corrosive fluids
and oils
  200 PSI, (1.38 MPa)
180 PSI - 2” size only
(1.24 MPa)
158ºF (70ºC)
159ºF-212ºF (71ºC-100ºC)
(Reduce pressure rating 15%)
  1750 RPM,
1750 - 3500 RPM
(Reduce pressure rating 20%)
1/2" to 2" NPT    
    *See performance charts for details


Features & Benefits
  • Silicon carbide / carbon graphite seal faces provide long service life
  • Short dry run capability for initial machine start up
  • High precision ball bearings for smooth running and long life, even at high speeds
  • Internal bearing protection and vented body to prevent lubricant washout
  • Aluminum housing with stainless steel shaft
  • No maintenance required