Duff-Norton rotary unions

4th Quarter 2015 Hydraulic systems & components

Duff-Norton’s new range of DWPA rotary unions transfer media such as water, steam, air, oil or hydraulic fluid from a stationary source to a rotating machine such as a drum or indexing table. They are used in process industries such as paper, printing, rubber, plastics, textiles and chemicals. Rotary unions are also used on cranes and machine tools and in many other applications. They deliver 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 that do not corrode aluminium and are compatible with nitrile rubber. Fitted with a stainless steel rotor, they boast 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 can safely be run dry for a short period. Replaceable cartridges facilitate maintenance. The pipe plugs at the end of the 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 bar and 1750 rpm. They are lab tested for quality and carry a one year warranty against defective materials or workmanship.

For more information contact Kevin Hoy, Yale Engineering Products, +27 (0)11 794 2910, [email protected], www.yalejhb.co.za

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