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Roller Screws
Rotary Union - Duff-Norton manufactures rotary unions, rotary joints, rotating joints and offers a line of 32 series ranging up to 10,000 psi and up to 5000 RPM. Rotary Union® is Duff-Norton’s registered trademark for rotating joints. Rotating joints are used to transfer fluids from a stationary supply to a rotating component, i.e., a drum or roll. They are used in process industries like paper, printing, rubber and plastics, textile and chemical; on cranes, on machine tools and in a host of other applications. They are used to provide heating or cooling media like 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. Duff-Norton has traditionally served the markets where it supplies its general purpose joints, such as the rubber and plastics industries, and in the textile market it supplies its 8000T, a joint designed especially for the textile industry. The single largest user industry of rotating joints worldwide is the pulp and paper industry, which requires large quantities of joints for steam, water and hot oil. The steam applications (i.e., dryer cans) are most prevalent in paper mills.
General Purpose Joints Steam & Hot Oil Joints MultiPort Joints Swivel Joints Specialty Joints
5000 Series
9000 Series
600 Series
4000 Series
300 Series
805 Series		 8000 Series
8100 Series
9000G Series
2000 Series		 HPMC/HSMC
1600 Series
1650 Series		 1100 Series
1102 Series
1200/1400 Series
1300 Series
1700 Series
1900 Series		 500 Series
1500 Series

GENERAL PURPOSE JOINTS
5000 Series General Purpose Stainless Steel Rotary Union®
 Series 5000 photo
  • Designed to handle water, steam, hot oil and air.
  • Features all stainless steel construction and hardware for superior corrosion resistance.
  • Fluorocarbon o-rings and two precision bearings keep the 5000 Series seal faces perfectly aligned.
  • All sizes are available with three seal options and with the addition of an elbow, become dual flow.
  • The balanced mechanical seal design of the 5000 series allows for optimal operation with a wide variety of media.
  • Integrated cartridge design makes refurbishment fast and easy.

Operating Parameters
Max Water Pressure 750 psi 52 bar
Max Water Temp 300ºF 150ºC
Max Steam Pressure 120 psi 8.2 bar
Max Temp Steam 350 ºF 175 ºC
Max Hot Oil Pressure 100 psi 6.8 bar
Max Hot Oil Temp 395 ºF 200 ºC
Max RPM NPT 1000 1000
Max RPM MT 3600 3600
Max RPM Air 550 550
 

9000 Series General Purpose Rotary Union®
Series 9000 photo
  • 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.
  • All sizes over 1-1/4” have dual bearings for additional load support.
  • Available with either flanged or threaded shaft connections for greater mounting flexibility.
  • Available with ball bearings for higher speed or maintenance-free graphite bearings for higher temperature applications. (See 9000G under “Steam & Hot Oil” section)
  • Integrated cartridge design makes refurbishment fast and easy.
  • Models with BSP or ISO 288 threads are also available.

Operating Parameters
Max Water Pressure 250 psi 17 bar
Max Water Temp 375ºF 190ºC
Max Steam Pressure 150 psi 10.2 bar
Max Temp Steam 375 ºF 190 ºC
Max Hot Oil Pressure 100 psi 6.8 bar
Max Hot Oil Temp 375 ºF 190 ºC
Max RPM NPT 700 700
Max RPM MT 1500 1500

600 Series General Purpose Rotary Union®
Series 1100 photo
  • Offered with either axial (straight through) nickel plated housing or radial (90 degree) inlet with aluminum housing for maximum flexibility in hydraulic, pneumatic, or water applications.
  • Features nickel treated carbon steel construction for corrosion resistance. Stainless steel models are also available.
  • Available in sizes from 1/4" to 1" and suitable for speeds up to 1500 RPM.
  • This 600 Series is equipped with a GR seal that also allows bi-directional or swivel rotation.
Operating Parameters
Max Temp 250ºF 120ºC
Max RPM 1500 1500
Max Pressure
Axial Inlet Models Radial Inlet Models
Size psi bar psi bar
1/4" 3625 250 1450 100
3/8" 3625 250 1450 100
1/2" 2175 150 1015 70
3/4" 1450 100 725 50
1" 1450 100 725 50

4000 Series Low Torque Rotary Union®
  • Perfect choice for high speed applications.
  • Features a unique balanced seal for long life and low torque, and a double row ball bearing to absorb radial and thrust loads.
  • Features a stainless steel shaft, bronze housing and a primary seal of carbon graphite against ceramic to offer maximum life and durability.
  • Available in single or dual flow models.

Operating Parameters
Max Water Pressure 1000 psi 68 bar
Max Water Temp 200ºF 93ºC
Max Air Pressure 300 psi 20.4 bar
Max Hot Oil Pressure 1000 psi 68 bar
Max Hot Oil Temp 200 ºF 93 ºC
Max RPM NPT 700 700
Max RPM MT 1500 1500

300 Series Small Envelope Rotary Union®
  • Ideal for higher speed air applications.
  • All steel parts are nickel treated for corrosion resistance in a wide variety of process fluids.
  • Small envelope dimensions make the 300 Series suitable for use in applications with space constraints.
Operating Parameters
Max Temp. 250ºF 120ºC
Max RPM 3500 3500
Max Air Pressure 117 psi 8 bar
Max Water Pressure 117 psi 8 bar

805 Series General Purpose Rotary Union®
  • Suitable for a wide range of applications including air, hydraulic fluid, water, non-toxic gases and oil.
  • Offered standard with an aluminum housing and stainless steel shaft, but is also available in all stainless steel construction.
  • Single flow models are offered in sizes from 1/4" to 1", and dual flow from 1/2" to 1".
  • Two seal options are offered: 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).
Operating Parameters
Max Pressure 435 psi 30 bar
Max Temp 320ºF 160ºC
Max RPM 5000 5000

STEAM & HOT OIL JOINTS
8000 Series Steam & Series Hot Oil Rotary Union®
Series 8000 photo
  • Designed for operation in a variety of steam applications.
  • Available in sizes ranging from 1/2" to 4."
  • 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 offer the same design features as the standard 8000 Series with a special high temperature seal ring for hot oil applications.
  • The stainless steel housing insert in the 8000T Series makes this joint a favorite in the textile industry.
  • Models with BSP or ISO 288 threads are also available.

Operating Parameters
Max Steam Pressure 175 psi 12 bar
Max Temp Steam 450ºF 232ºC
Max Hot Oil Pressure 100 psi 6.8 bar
Max Hot Oil Temp 600ºF 316ºC
Max RPM 600 600

8100 Series Rod Supported Rotary Union®
  • Specially developed for pulp & paper dryer can applications.
  • Offers decades of proven technology in a simple, dependable design.
  • The 8100-RSQ is a great choice for other applications that utilize a rotating siphon such as calendars, chill rolls and rubber and plastic mills.
  • Compatible for use with many types of media including steam, condensate, brine, heat transfer oils and water.
  • The weight of the 8100 Series Rotary Union® is supported externally, eliminating wear and lubrication requirements to bearing elements.
  • Dimensionally compatible with other rod-supported joints, there won’t be any need to modify your plumbing.

Operating Parameters
Compatible Media: Steam, Condensate, Brine, Heat Transfer Oils, Water
Speed 300 RPM
Tempreture 650ºF 343ºC
Pressure 250 psi 17.2 bar

9000G Series High Temperature Rotary Union®
  • The unique design of the bellows type Rotary Union® permits them to be used to introduce heating agents into rolls or cylinders in various types of machinery.
  • Offers the same design as the standard 9000 Series, but utilizes a carbon graphite bearing for high temperature applications.
  • Because there is no rolling element bearing, no lubrication is required, making the 9000G maintenance free.
  • The thrust collar allows for thermal expansion, making this an ideal union for high temperature, general purpose applications.
Operating Parameters
Max Water Pressure 250 psi 17 bar
Max Steam Pressure 175 psi 11.9 bar
Max Temp Steam 378ºF 192ºC
Max Hot Oil Pressure 100 psi 6.8 bar
Max Hot Oil Temp 600ºF 315ºC
Max RPM NPT 700 700

2000 Series Shock & Vibration Resistant Rotary Union®
 
  • 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.

Operating Parameters
Max Water Pressure 150 psi 10.2 bar
Max Water Temp 375ºF 190ºC
Max Hot Oil Pressure 100 psi 6.8 bar
Max Hot Oil Temp* 550 ºF 290 ºC
Max Air Pressure 100 psi 6.8 bar
Max RPM 500 500
*Consult our factory for applications exceeding 375ºF

MULTIPORT JOINTS
HPMC & HSMC Series MultiPort Rotary Unions®
 Multiport Rotary Union photo
  • Duff-Norton multi-circuit Rotary Unions® are available in both high pressure (HPMC Series) and high speed (HSMC Series) configurations.
  • Series HPMC Rotary Unions® are designed for higher pressure requirements, available with up to eight ports as standard and 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. Special configurations are available upon request
  • Series HSMC Rotary Unions® are available with up to four ports as standard.
  • Series HSMC is perfect for low pressure applications, up to 175 psi (12 bar) with rotational speeds up to 3,000 rpm.
  • Feel free to run dissimilar fluids through Duff-Norton Multiport Rotary Unions® as each port is always individually sealed eliminating “crosstalk” between circuits.

Operating Parameters
HSMC
Max Pressure 435 psi 30 bar
Max Temp 320ºF 160ºC
Max RPM 5000 5000
Standard Ports 2 to 4
HPMC
Max Pressure 435 psi 30 bar
Max Temp 320ºF 160ºC
Max RPM 5000 5000
Standard Ports 2 to 8

1600 Series Two Port Rotary Union®
  • Features two circuits for use in a wide variety of applications.
  • Offers the ability to use medium speed and pressure simultaneously.
  • Comes standard with nickel plating, but is also available in all stainless steel and with a hardened ceramic shaft for higher speed and longer life.
  • Available in sizes from ¼ ” to 1,” our 1600 Series offers a threaded connection.
  • Feel free to use two dissimilar fluids, as all circuits are individually sealed eliminating “crosstalk.”
Operating Parameters
Max Pressure 2900 psi 200 bar
Max Temp 250ºF 120ºC
Max RPM 1500 1500

1650 Series Two Port Rotary Union®
 
  • Features two circuits for use in a wide variety of applications.
  • Offers the ability to use medium speed and pressure simultaneously.
  • Comes standard with nickel plating, but is also available in all stainless steel and with a hardened ceramic shaft.
  • Available in sizes from ¼ ” to 1,” our 1650 Series offers a flanged connection.
  • Feel free to use two dissimilar fluids, as all circuits are individually sealed eliminating “crosstalk.”
Operating Parameters
Max Pressure 2900 psi 200 bar
Max Temp 250ºF 120ºC
Max RPM 1500 1500

SWIVEL JOINTS
1100 Series Slow Rotation/Swivel Rotary Union®
  • Threaded swivel joints for use in applications where complete rotation is not necessary. Designed for swiveling or slow rotation applications.
  • Available in sizes from 1/4" to 3" and can be used at pressures up to 725 psi (50 bar).
  • This series has a GR seal and is available with axial (straight through) flow, or radial flow with the addition of a 90° stainless steel elbow.
  • Features nickel treated carbon steel construction. Stainless steel models are also available.

Operating Parameters
Max Temp 392ºF 200ºC
Max RPM 60 60
Standard Materials Stainless Steel
Size psi bar psi bar
1/4" 725 50 290 20
3/8" 725 50 290 20
1/2" 725 50 290 20
3/4" 725 50 290 20
1" 435