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Rotary Union

Duff-Norton (USA)

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 12″ 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.

General Purpose

Rotary Unions - 5000 Series

General Purpose Stainless Steel

5000 Series stainless steel construction for superior corrosion resistance.

  • Two precision bearing keep seals faces perfectly aligned to extend the life of the 5000 Series Rotary Union.
  • The balanced seal design of the 5000 series allows for optimal operation with a wide variety of media.
  • With the addition of an elbow the 5000 series simply converts to dual flow Rotary Union.
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DWA Rotary Unions for water applications

General Purpose

Typical applications include heating and cooling process rolls, rubber mixers, embossing rolls and calendars.

  • Silicon carbide / carbon graphite seal faces for long service life
    Short dry run capability for initial machine start up
  • Aluminium body and Stainless Steel shaft
  • High precision ball bearings
    Internal bearing protection and vented body prevents lubricant washout
    No maintenance required
  • Mono flow and dual flow models available for stationary or rotating siphon pipes
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Rotary Unions - 9000 Series

General Purpose

The Bellows sealing system provides superior sealing performance throughout the life of the wear life of the Rotary Union. This Rotary Union  is also suitable for Vacuum applications.

  • Dual bearings are available in all sizes above 1 1/4″ to provide superior alignment.
  • Debris in contaminated media will not be captured in the Bellows sealing system which reduces drag.
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Rotary Unions - 805 Series

General Purpose

Used for a wide variety of process fluids with temperatures up to 160 Deg C and speeds up to 5000 rpm.

  • Mono Flow – 1/4″ to 1″
    Dual Flow – 1/2″ to 1″
  • E1 – Standard Seal carbon graphite against ceramic for pressures up to 435 psi.
    E2 – Optional Seal stainless steel against ceramic for pressures up to 725 psi.
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Rotary Unions - 600 Series

General Purpose

All sizes are offered in axial flow (nickel plated steel) or radial flow 90 degree (aluminium housing) for maximum flexibility. Also available in Stainless Steel.

  • Available in 1/4″ to 1″ NPT, BSPP & Machine Thread
  • Suitable for speeds up to 1500 rpm.
  • The series 600 utilizes a teflon encapsulated O-Ring design for higher pressures and bi directional operation.
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Rotary Unions - 300 Series

Air Small Envelope

Ideal for high speed air and water rotary union applications.

Typically used for rotary union air supply for pneumatic clutch and brake applications. Also used in pneumatic control systems  – e.g. – rotary unions for central tyre inflation CTI for trucks and off road vehicles.

  • All steel parts are nickel plated steel for corrosion resistance.
  • Small envelope dimensions make the 300 Series Rotary Union suitable for use in applications with space constraints.
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Steam & Hot Oil

Rotary Unions - 9000G Series

High Temperature

Bellows Sealing System provides superior sealing performance throughout the wear life of the Rotary Union.

  • Debris in contaminated media will not be captured in the Bellows Sealing System, which reduces clogging
  • The 9000G is maintenance free because there is no rolling element bearing, therefore no lubrication is required.
  • Offers the same design as the standard 9000 Series, but utilizes carbon graphite bearings for high temperature applications.
  • The thrust collar allows for thermal expansion, making this an ideal union for high temperature, general purpose applications.
  • Available upon application.
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Rotary Unions - 8000G Series

Steam & Hot Oil

Designed for operation in a variety of steam applications.

  • An anti-torque lug prevents rotation of the housing while in operation
  • The special carbon graphite bearing is lubricated by the process fluid and requires no additional lubrication.
  • 8000HO offers the same design features as the standard 8000 Series but with a special high temperature seal ring for hot oil applications.
  • The stainless steel housing insert in the 8000T Series makes this joint a favourite in the textile industry.
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Rotary Unions - 2000G Series

Shock & Vibration Resistant

Designed with two ball bearings spaced to withstand radial and thrust loads.

  • Compression springs in the 2000 Series provide even loading across the seal surfaces to maintain zero leakage even in low pressure applications
  • Designed with an integral flange that allows repairs without removing the housing from the machine.
  • The flange attaches directly to the machine journal, providing inherently concentric mounting, minimizing overhang, and partially relieving bearing load to increase service life.
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Multiport

Rotary Unions - HPMC/HSMC Series

Multi Port - high pressure or high speed

Duff-Norton multi-port Rotary Unions are available in both high pressure (HPMC Series) and high speed (HSMC Series) configurations.

  • HPMC Series Multi Port 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.
  • HSMC Series Rotary Unions are available with up to 4 ports as standard.
  • HSMC Series is perfect for low pressure applications, up to 175 psi with rotational speeds up to 3,000 rpm.
  • Feel free to run dissimilar fluids through the Duff-Norton Multi-Port Rotary Unions as each port is always individually sealed eliminating cross contamination between circuits
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Rotary Unions - 1600 Series

Two Port

Features two ports for use in a wide variety of applications.
Commonly used rotary union for steel industry winder and unwinder machines.

  • Nickel plated steel body for corrosion resistance.
    Available in all stainless steel models.
  • Offers the ability to use medium speed and pressure simultaneously.
  • The 1600 Series two port rotary union can be used with two dissimilar fluids. All circuits are individually sealed eliminating cross contamination.
  • Option available with a hardened ceramic shaft for higher speeds and longer life.
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Rotary Unions - 1650 Series

Two Port - flanged rotary union

Features two circuits for use in a wide variety of applications – Hydraulic Oil, Water & Air.
Flanged design providing easy connection.

  • HPMC Series Multi Port 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.
  • HSMC Series Rotary Unions are available with up to 4 ports as standard.
  • HSMC Series is perfect for low pressure applications, up to 175 psi with rotational speeds up to 3,000 rpm.
  • Feel free to run dissimilar fluids through the Duff-Norton Multi-Port Rotary Unions as each port is always individually sealed eliminating cross contamination between circuits
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Specialty Rotary Unions

Rotary Unions - 500 Series

Hollow shaft mounted design

This unique design employs a hollow shaft rotary union configuration allowing the 500 series to be directly mounted onto the external diameter of a rotating shaft. Media transfers into the shaft from the mounted position of the rotating union.

  • Excellent load ratings; Over 90% efficient with low torque and power requirements. Long and predictable life ratings.
  • Excellent quality, all ball screws are precision rolled, heat treated, inspected and then manganese phosphate or black oxide coated. Good lead accuracy.
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Swivels

Rotary Swivels - 1100 Series

Slow Rotation, bi-directional

1100 Series rotary swivels are for applications where complete rotation is not necessary.

  • Designed for swiveling or slow rotation applications.
  • The 1100 series has the GR seal for superior sealing performance.
  • Available with axial (straight through) flow, or radial flow with the addition of a 90 degree stainless steel elbow.
  • Features nickel plated carbon steel construction. Stainless steel models are also available.
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Rotary Swivels - 1102 Series

Slow Rotation, bi-directional

1102 Series swivels are for applications where complete rotation is not necessary.

  • Designed for swiveling or slow rotation applications.
  • The 1102 series will operate at pressures up to 1650 psi.
  • The 1102 series has the GR Seal for superior sealing performance.
  • Swivels available with inline flow (straight through) or radial flow with the addition of a 90° stainless steel elbow.
  • Features nickel plated carbon steel construction. Stainless steel rotary swivel models are also available.
  • The 1102 Series slow rotation swivel offers two ball races which allow for increased pressure and speed.
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High Pressure Swivels - 1700 Series

High pressure swivel for use in hydraulic and pneumatic applications.

  • Standard models feature nickel treated carbon steel construction, but are also available in all stainless steel.
  • Equipped with a GR seal, which is suitable for most fluids.
  • A single acting thrust bearing permits slow rotation at high pressures
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High Pressure Rotary Swivels - 1900 Series

Hydraulic swivel applications

High pressure rotary swivel for use in hydraulic and pneumatic applications.

  • Designed for use in very high pressure applications up to 10,150 psi.
  • Standard models feature nickel plated carbon steel construction. Also available in all stainless steel.
  • Equipped with a GR seal for superior sealing performance.
  • Equipped with a double acting thrust bearing and a bronze bushing. The bearing permits higher pressure, while the bushing increases the guide of the shaft to allow faster rotating speeds.
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Slow Rotation Swivels - 1200 Series

Perfect for small envelope dimensions.

  • Slow or swiveling rotation.
  • Suitable for hydraulic service.
  • PTFE seals require no lubrication.
  • Precision made wrench flats on center shaft for easy installation. Custom designs available.
  • The 1200 Series swivel is nickel plated as standard. Also available in stainless steel.
  • NPT standard. SAE, JIC, DIN or ISO threads are available upon request.
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Flanged Rotary Swivels - DNRF Series

Perfect solution for use in applications where slow rotation or swiveling motion is needed for connections of pipes and hoses.

  • Designed for use in very high pressure applications up to 10,150 psi.
  • Standard models feature nickel plated carbon steel construction. Also available in all stainless steel.
  • Equipped with a GR seal for superior sealing performance.
  • Equipped with a double acting thrust bearing and a bronze bushing. The bearing permits higher pressure, while the bushing increases the guide of the shaft to allow faster rotating speeds.
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Flanged Rotary Swivels - 1300 Series

Used in applications where slow rotation or swiveling motion is needed.

  • Design features include a ball bearing for rotation, and a GR seal for superior sealing performance.
  • Allows for stability in high flow applications.
  • Can be used in applications with temperatures up to 200 Deg C.
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