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Duff-Norton Rotary Unions for long-lasting versatility

Duff-Norton Rotary Unions for long-lasting versatility

Posted On: 24 April 2015

For more than 122 years, Duff-Norton, a Columbus McKinnon company, has earned a reputation for reliable, high quality products, in both standard and custom designed configurations. These meet the industrial lifting, positioning and transfer needs of its customers worldwide.

Duff-Norton is proud to announce the introduction of its range of DWPA rotary unions. Rotary unions are intended to transfer media such as water, steam, air, oil, hydraulic fluid, etc. from a stationary source to a rotating machine, such as a drum or an indexing table. They are used in process industries such as paper, printing, rubber and plastics, textile and chemical manufacture. Rotary unions are also used on cranes, machine tools and in many other applications.

Duff-Norton rotary unions are used to provide moderate heating or cooling media such as 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.

DWPA rotary unions can be used with media (aqueous fluids, oils, steam) that do not corrode aluminium and are compatible with nitrile rubber. Fitted with a stainless steel rotor, the DWPA rotary union boasts silicon carbide/carbon graphite seal faces to give extended service life. High precision ball bearings ensure smooth running and long life, even at high operating speeds. The internal bearing protection and vented body prevent lubricant wash-out.

To ease starting, the DWPA rotary union can safely be run dry for a short period. Replaceable cartridges facilitate maintenance.

The pipe plugs in the end of the DWPA rotary unions can be replaced with special elbows available from Duff Norton. This allows for the installation of either stationary or rotating siphon pipes for dual flow applications.

Duff Norton supplies rotary unions in operational ranges to handle up to 14 bars and up to 1,750 rpm. DWPA rotary unions are lab tested for quality and carry a one-year warranty against defective materials or workmanship.

Duff Norton DWPA rotary unions are available in South Africa from Yale Engineering Products (Pty) Ltd, a subsidiary of Columbus McKinnon.