Service & Repairs

Rotary Unions

Also see Rotary Unions Quick Reference Chart

Series 5000
Series 5000 photo

The Series 5000 general purpose rotating joint is 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.

Series 2500
Series 2500 photo

Features like the welded-edge metal bellows type seal, secondary lip seal, air circulated insulating sleeve and finned housing of the Series 2500 make it the best hot oil joint on the market. The Series 2500 is designed to dissipate heat and withstand shock and vibration to ensure reliable, trouble-free performance.

Series 9000

Series 9000 photo

The Series 9000 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 non-abrasive debris and suspensions. The Series 9000 is available with either flanged or threaded shaft connections for greater mounting flexibility and with ball bearings for higher speed or maintenance-free graphite bearings for higher temperature applications.

Series 8000
Series 8000 photo

Available in sizes ranging from 1/2" to 4", the Series 8000 is designed for operation in a variety of steam and hot oil applications. The special carbon graphite bearing requires no lubrication. The stainless steel sleeve insert makes this joint a favorite in the textile industry.

Series 805
Series 1700 photo

Duff-Norton is proud to introduce series 805 for use with a wide variety of process fluids including air, vacuum, chemicals, and oil.

Series 805 offers two seal options, E1 (standard) is carbon graphite against ceramic and can be used at pressures up to 435 psi (35 bar), and E2 which is stainless steel against ceramic and can be used at pressures up to 725 psi (50 bar). All models can be used at temperatures up to 320F (160C) and speeds up to 5000 rpm depending on the pressure.

Single flow models are offered in sizes from 1/4" to 1", and dual flow from 1/2" to 1".

Series 600
Series 1100 photo

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

Series 600 Rotary Unions® feature nickel treated carbon steel construction for corrosion resistance. Stainless steel models are also available. Series 600 uses a teflon encapsulated O-ring seal designed for higher pressures and easy maintenance. All sizes are offered in axial or radial flow (90) options. Series 600 standard models are backed with a one year warranty.

High Pressure Joints

high pressure joints

high pressure joints

Duff-Norton is proud to introduce a wide range of high pressure Rotary Unions® for use in hydraulic and pneumatic applications.

Series 1700 is a single ball bearing design for slow rotation at up to 5,000 psi (350 bar). Standard models are made of nickel treated carbon steel. Stainless steel models are available.

Series 1900 is used for higher pressure applications (up to 10,000 psi/ 700 bar) at speeds not exceeding 100 rpm. Series 1900 features two spaced ball bearings and Teflon encapsulated O-ring seals for minimal maintenance.

Series 6000 joints are available in eight sizes, from 1 /8" - 1 1/2". Both radial and axial flow configurations are offered as standard models. Series 6000 joints are ideal for shaft speed up to 5000 rpm and pressure up to 1500 psi (10 bar).

Multiport Joints

Duff-Norton multiport Rotary Unions® are available in both high pressure and high speed configurations.

Series HPMC Rotary Unions® are designed for higher pressure requirements, and available with up to eight ports as standard models. Special configurations are available upon request. Series HPMC 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.

Series HSMC Rotary Unions® are available with up to four ports as standard models. Series HSMC is perfect for low pressure applications, up to 175 psi (12 bar) with rotational speeds up to 3,000 rpm.

Threaded Swivel Joints

Duff-Norton's Series 1100 joints are threaded swivel joints for use in applications where complete rotation is not necessary. Series 1100 joints are available n sizes from 1/4" to 3", and can be used at pressures up to 725 psi (50 bar).

Series 1102 swivel joints are designed for higher pressure applications, for use at up to 1160 psi (80 bar). Series 1102 joints are offered in 13 sizes, from 1/4" to 6".

Series 1100 and Series 1102 models feature nickel treated carbon steel construction. Stainless steel models are also available. All sizes are offered in axial flow configurations, or with a 90° stainless steel elbow.

Flanged Swivel Joints

Duff-Norton's Series 1300 joints are flanged swivel joints ranging in size from 2" through 12". They are used in applications where slow rotation or swiveling motion is needed. Series 1300 joints are suitable for use at pressures up to 290 psi.

Series 1300 joints are 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. Series 1300 swivel joints can be used in applications with temperatures up to 392° F (200° C)


There are three basic types of Rotary Unions®:

 P: Plain

S: Stationary Siphon
RS: Rotating Siphon
P Type Single Flow Diagram S Type Dual Flow Diagram RS Type Dual Flow diagram

 Single Flow

Dual Flow
Dual Flow
There are two mounting methods for Rotary Unions®: shaft mounted, which may utilize either a threaded or quick release connection, and flange mounted in which the housing is mounted directly to the drum and rotates while the shaft remains stationary.





  • Paper Industry
  • Printing and Converting
  • Food and Pharmaceuticals
  • Clutches and Brakes
  • Automobile manufacturing
  • Chemical Industry
  • Machining Centres
  • Textiles
  • Rubber and Plastics
  • Tank Farms
  • Hydraulic Applications

Also see Rotary Unions Quick Reference Chart


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