Rotary Unions

Rotary Unions

Duff Norton Rotary Unions or Rotating Unions are devices used to provide a rotating seal for transfer of fluids and gases from from a stationary inlet to rotating equipment often under high pressure. Duff Norton specializes in the design, manufacture & integration of rotary unions & swivel joints for today's industry.

Years of service in tough field applications prove these rotating joints give long service and minimise production downtime.

Duff Norton manufactures Rotary Unions, rotary joints, rotating joints and swivels in 32 different series for pressures ranging up to 10,000 psi and speeds up to 5000 RPM. Sizes range from 1/8" to 6" nominal pipe sizes in single and dual flow designs including multi-port hydraulic models .In most styles, optically flat seal faces and ball bearings reduce torque and friction drag.

At Duff Norton Australia we offer a full line of standard products for a wide variety of applications including - dryer drums, cooling rolls, extruders, calendars, laminators, press rolls, embossers and similar applications.

Custom engineered models are available by special order.


Rotary Union Quick Selection Table


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Rotary Unions - 300 Series Small Envelope

Rotary Unions for Air applications required to operate at high speeds combined with space constraints makes the Duff Norton 300 Series Small Envelope Rotary Union an ideal choice.

Rotary Unions 600 Series General Purpose

Duff-Norton Series 600 Rotary Unions® are general purpose Rotary Unions designed for hydraulic, pneumatic and water applications. Series 600 Rotary Unions are available in sizes from 1/4" to 1" and can be used at pressures up to 3625 psi (250 bar).

Rotary Unions - 5000 Series General Purpose Stainless Steel

5000 Series stainless steel rotary union is a general purpose rotating joint suitable for hot oil, steam, water, air and chemical use. It features all stainless steel hardware for superior corrosion resistance. The fluorocarbon o-rings and bearing seals in the Series 5000 allow it to run at higher temperatures and ensure longer life with minimal maintenance. The integrated cartridge design makes refurbishment fast and easy.

Rotary Unions - 9000 Series General Purpose

The 9000 Series General Purpose Rotary Union features a bellows type seal to provide greater flexibility where equipment misalignment is inherent, and to resist seal hang-up in media contaminated with debris and suspensions. All sizes over 1-1/4˝ have dual bearings for additional load support. The 9000 Series is available with either flanged or threaded shaft connections for greater mounting flexibility. Models with BSP or ISO228 threads are available.

General Purpose Rotary Unions - 805 Series

805 Series Rotary Union is used with a wide variety of process fluids including air, vacuum, chemicals, and oil. All models can be used at temperatures up to 320F (160C) and speeds up to 5000 rpm depending on the pressure.

DWA Rotary Unions for Water Applications

Duff Norton DWA Rotary Union for water is used in applications where water reaches a maximum temperature of 100 Deg C. The maximum speed of this unit is 3500 RPM and the maximum pressure is 200 psi. Typical applications include heating or cooling process rolls, rubber mixers, embossing rolls and calendars. The NEW DWA Series Water Rotary Union is an economical way to solve your process heating and cooling solutions.

Two Port Rotary Unions - 1650 Series

Two port rotary union - 1650 Series featuring individually sealed circuits can be used with dissimilar fluids without cross contamination. Used for medium speed and pressure applications with flanged connection. Available in nickel plates steel and stainless steel with hardened ceramic shaft for higher speeds and longer life.

Two Port Rotary Unions - 1600 Series

Two port rotary union - 1600 series features individually sealed circuits which can be used with dissimilar fluids without cross contamination. Used for medium speed and pressure applications with threaded connection. Available in nickel plates steel and stainless steel with hardened ceramic shaft for higher speeds and longer life.

Multi Port Rotary Unions - HPMC/HSMC Series

Duff Norton multiport Rotary Unions are available in both high pressure and high speed configurations. Duff Norton multi-port HPMC series joints are suitable for use in low speed applications for pressures up to 5880 psi (400 bar). Each passage is sealed to restrict leakage between ports. Multi Port HSMC Series Rotary Unions® are available with up to four ports as standard models. HSMC series is perfect for low pressure applications, up to 175 psi (12 bar) with rotational speeds up to 3,000 rpm.

Around The Shaft Rotary Unions - 500 Series

Around the Shaft Rotary Unions - 500 Series, allows media to be transferred in a rotating shaft by mounting the rotating joint onto or around the shaft. This special design is a unique solution for low speed high pressure rotary union applications or high speed low pressure applications. 500 series rotary union is available in nickel plated steel or stainless steel.

2000 Series Shock and Vibration Resistant Rotary Unions

The 2000 Series Rotary Union is designed for introducing heat and cooling agents into rolls or cylinders in machinery. This shock and vibration resistant rotating joint is perfect for tough applications.

Rotary Unions Steam and Hot Oil 8000 Series

8000 Series is designed for operation in a wide variety of steam rotary union and hot oil rotary union applications. Sizes available range from 1/2" to 4". The special carbon graphite bearing avoids the need for lubrication. A stainless steel sleeve insert makes this rotary joint a favorite within the textile industry.

9000G Series High Temperature Rotary Unions

The 9000 Series General Purpose Rotary Union® features a bellows type seal providing superior sealing perfomance throughout the wear life. The 9000G rotating joint employs no rolling element carbon graphite bearings making them ideal for high temperature rotating union applications and maintenance free service.

Rotary Swivels 1100 Series Slow Rotation

Duff-Norton Series 1100 Rotary Swivels are threaded for use in applications where complete rotation is not necessary. Series 1100 rotary swivels are available n sizes from 1/4" to 3", and can be used at pressures up to 725 psi (50 bar). 1100 series feature nickel treated carbon steel construction. Stainless steel rotary swivels are also available. All sizes are offered in axial flow configurations, or with a 90° stainless steel elbow.

Slow Rotation Swivels - 1102 Series

Duff Norton slow rotation swivels 1102 series are designed for swiveling or slow rotation applications only. The 1102 Series is offered in sizes from 1/4˝ to 6˝ and can be used at pressures up to 1160 psi (80 bar). This series has a GR Seal and is available with axial (straight through) flow, or radial flow with the addition of a stainless steel elbow. Standard models feature nickel treated carbon steel construction, but are also available in all stainless steel. Series 1102 offers two ball bearings which allow for increased pressure and speed.

Slow Rotation Swivel - 1200 Series

1200 Series Small Envelope Swivel offer easy installation and no lubrication required. This Duff Norton Swivel comes standard in nickel plated steel and is also available as a stainless steel swivel. Sizes range from 1/4" to 2" thread size.

DNRF Series Flanged Rotary Swivels

Flanged Rotary Swivel Stainless Steel or Nickel Plated that allows easy connection to pipes and hoses.

1300 Series Flanged Rotary Swivels

1300 Series swivels are flanged swivel joints ranging in size from 2" through 12". They are used in applications where slow rotation or swiveling motion is needed. 1300 series flanged rotary swivels are suitable for use with pressures up to 290 psi. Available in nickel treated carbon steel construction as standard or with a stainless steel shaft. Design features include a ball bearing for rotation and a Teflon-encapsulated o-ring seal. 1300 Series Duff Norton Swivel can be used in applications with temperatures up to 200 Deg C.

High Pressure Swivels - 1700 Series

1700 Series High Pressure Rotary Swivel is a single ball bearing design for slow rotation at up to 5,075 psi (350 bar).Duff Norton offers a wide range of swivels suitable of hydraulic and pneumatic applications. Standard models are made of nickel treated carbon steel. Stainless steel models are available.

High Pressure Rotary Swivel - 1900 Series

High Pressure Rotary Swivel - 1900 Series is used for higher pressure applications up to 10,150 psi/ 700 bar at speeds not exceeding 100 rpm. Duff Norton 1900 Series Rotary Swivel features two spaced ball bearings and Teflon encapsulated O-ring seals for minimal maintenance.