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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

170 PSI (HSMC)
5,880 PSI (HPMC)


248º F(HSMC & HPMC)

3,000 RPM (HSMC)
180 RPM (HPMC)

3/8" to 3/4" NPT or BSP

Nickel Plated Steel


2 to 8

*See performance charts for details

Features & Benefits
  • High Pressure or High Speed Applications - Duff-Norton multi-port Rotary Unions are available in both high pressure (HPMC Series) and high speed (HSMC Series) configurations
  • Pressures Up to 5,880 psi - HPMC Series Rotary Unions are designed for higher pressure, available with up to eight ports as standard and are suitable for use in low speed applications for pressures up to 5,880 psi
  • Available up to 4 Ports - HSMC Series Rotary Unions are available with up to four ports as standard
  • Speeds up to 3,000 RPM - HSMC Series is perfect for low pressure applications, up to 175 psi with rotational speeds up to 3,000 RPM
  • No Cross Contamination - Feel free to run dissimilar fluids through Duff-Norton Multi-Port Rotary Unions as each port is always individually sealed eliminating cross contamination between circuits