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| 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.
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| GENERAL
PURPOSE JOINTS |
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Designed to handle water, steam, hot oil and air.
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Features all stainless steel construction and hardware for superior
corrosion resistance.
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Fluorocarbon o-rings and two precision bearings keep the 5000
Series seal faces perfectly aligned.
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All sizes are available with three seal options and with the
addition of an elbow, become dual flow.
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The balanced mechanical seal design of the 5000 series allows for
optimal operation with a wide variety of media.
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Integrated cartridge design makes refurbishment fast and easy.
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Operating Parameters
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| Max Water Pressure |
750 psi |
52 bar |
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Max Water Temp |
300ºF |
150ºC |
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Max Steam Pressure |
120 psi |
8.2 bar |
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Max Temp Steam |
350 ºF |
175 ºC |
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Max Hot Oil Pressure |
100 psi |
6.8 bar |
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Max Hot Oil Temp |
395 ºF |
200 ºC |
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Max RPM NPT |
1000 |
1000 |
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Max RPM MT |
3600 |
3600 |
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Max RPM Air |
550 |
550 |
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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.
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All sizes over 1-1/4” have dual bearings for additional load
support.
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Available with either flanged or threaded shaft connections for
greater mounting flexibility.
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Available with ball bearings for higher speed or maintenance-free
graphite bearings for higher temperature applications. (See 9000G under “Steam
& Hot Oil” section)
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Integrated cartridge design makes refurbishment fast and easy.
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Models with BSP or ISO 288 threads are also available.
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Operating Parameters
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Max Water Pressure |
250 psi |
17 bar |
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Max Water Temp |
375ºF |
190ºC |
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Max Steam Pressure |
150 psi |
10.2 bar |
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Max Temp Steam |
375 ºF |
190 ºC |
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Max Hot Oil Pressure |
100 psi |
6.8 bar |
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Max Hot Oil Temp |
375 ºF |
190 ºC |
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Max RPM NPT |
700 |
700 |
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Max RPM MT |
1500 |
1500 |
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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.
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Features nickel treated carbon steel construction for corrosion
resistance. Stainless steel models are also available.
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Available in sizes from 1/4" to 1" and suitable for speeds up to
1500 RPM.
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This 600 Series is equipped with a GR seal that also allows
bi-directional or swivel rotation.
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| Operating Parameters |
| Max Temp |
250ºF |
120ºC |
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Max RPM |
1500 |
1500 |
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Max Pressure |
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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 |
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Perfect choice for high speed applications.
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Features a unique balanced seal for long life and low torque, and a
double row ball bearing to absorb radial and thrust loads.
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Features a stainless steel shaft, bronze housing and a primary seal
of carbon graphite against ceramic to offer maximum life and durability.
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Available in single or dual flow models.
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Operating Parameters
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Max Water Pressure |
1000 psi |
68 bar |
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Max Water Temp |
200ºF |
93ºC |
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Max Air Pressure |
300 psi |
20.4 bar |
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Max Hot Oil Pressure |
1000 psi |
68 bar |
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Max Hot Oil Temp |
200 ºF |
93 ºC |
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Max RPM NPT |
700 |
700 |
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Max RPM MT |
1500 |
1500 |
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Ideal for higher speed air applications.
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All steel parts are nickel treated for corrosion resistance in a
wide variety of process fluids.
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Small envelope dimensions make the 300 Series suitable for use in
applications with space constraints.
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| Operating Parameters |
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Max Temp. |
250ºF |
120ºC |
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Max RPM |
3500 |
3500 |
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Max Air Pressure |
117 psi |
8 bar |
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Max Water Pressure |
117 psi |
8 bar |
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Suitable for a wide range of applications including air, hydraulic
fluid, water, non-toxic gases and oil.
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Offered standard with an aluminum housing and stainless steel shaft,
but is also available in all stainless steel construction.
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Single flow models are offered in sizes from 1/4" to 1", and dual
flow from 1/2" to 1".
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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).
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| Operating Parameters |
| Max Pressure |
435 psi |
30 bar |
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Max Temp |
320ºF |
160ºC |
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Max RPM |
5000 |
5000 |
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| STEAM
& HOT OIL JOINTS |
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Designed for operation in a variety of steam applications.
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Available in sizes ranging from 1/2" to 4."
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An anti-torque lug prevents rotation of the housing while in
operation.
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The special carbon graphite bearing is lubricated by the process
fluid and requires no additional lubrication.
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8000HO offer the same design features as the standard 8000 Series
with a special high temperature seal ring for hot oil applications.
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The stainless steel housing insert in the 8000T Series makes this
joint a favorite in the textile industry.
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Models with BSP or ISO 288 threads are also available.
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Operating Parameters
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Max Steam Pressure |
175 psi |
12 bar |
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Max Temp Steam |
450ºF |
232ºC |
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Max Hot Oil Pressure |
100 psi |
6.8 bar |
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Max Hot Oil Temp |
600ºF |
316ºC |
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Max RPM |
600 |
600 |
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Specially developed for pulp & paper dryer can applications.
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Offers decades of proven technology in a simple, dependable design.
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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.
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Compatible for use with many types of media including steam,
condensate, brine, heat transfer oils and water.
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The weight of the 8100 Series Rotary Union® is supported
externally, eliminating wear and lubrication requirements to bearing elements.
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Dimensionally compatible with other rod-supported joints, there
won’t be any need to modify your plumbing.
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Operating Parameters
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| Compatible Media: Steam,
Condensate, Brine, Heat Transfer Oils, Water |
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Speed |
300 RPM |
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Tempreture |
650ºF |
343ºC |
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Pressure |
250 psi |
17.2 bar |
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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.
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Offers the same design as the standard 9000 Series, but utilizes a
carbon graphite bearing for high temperature applications.
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Because there is no rolling element bearing, no lubrication is
required, making the 9000G maintenance free.
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The thrust collar allows for thermal expansion, making this an ideal
union for high temperature, general purpose applications.
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| Operating Parameters |
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Max Water Pressure |
250 psi |
17 bar |
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Max Steam Pressure |
175 psi |
11.9 bar |
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Max Temp Steam |
378ºF |
192ºC |
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Max Hot Oil Pressure |
100 psi |
6.8 bar |
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Max Hot Oil Temp |
600ºF |
315ºC |
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Max RPM NPT |
700 |
700 |
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Designed with two ball bearings spaced to withstand radial and
thrust loads
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Compression springs in the 2000 Series provide even loading across
the seal surfaces to maintain zero leakage even in low pressure applications.
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Designed with an integral flange that allows repairs without
removing the housing from the machine.
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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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Operating Parameters
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| Max Water Pressure |
150 psi |
10.2 bar |
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Max Water Temp |
375ºF |
190ºC |
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Max Hot Oil Pressure |
100 psi |
6.8 bar |
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Max Hot Oil Temp* |
550 ºF |
290 ºC |
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Max Air Pressure |
100 psi |
6.8 bar |
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Max RPM |
500 |
500 |
| *Consult
our factory for applications exceeding 375ºF
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| MULTIPORT
JOINTS |
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Duff-Norton multi-circuit Rotary Unions® are available in both high
pressure (HPMC Series) and high speed (HSMC Series) configurations.
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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
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Series HSMC Rotary Unions® are available with up to four ports as
standard.
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Series HSMC is perfect for low pressure
applications, up to 175 psi (12 bar) with rotational speeds up to 3,000 rpm.
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Feel free to run dissimilar fluids through Duff-Norton Multiport
Rotary Unions® as each port is always individually sealed eliminating
“crosstalk” between circuits.
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Operating Parameters
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| HSMC |
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Max Pressure |
170 psi |
12 bar |
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Max Temp |
248ºF |
120ºC |
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Max RPM |
3000 |
3000 |
| Standard Ports |
2 to 4 Ports |
| HPMC |
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Max Pressure |
5880 psi |
400 bar |
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Max Temp |
248ºF |
120ºC |
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Max RPM |
180 |
180 |
| Standard Ports |
2 to 8 Ports |
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Features two circuits for use in a wide variety of applications.
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Offers the ability to use medium speed and pressure simultaneously.
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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.
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Available in sizes from ¼ ” to 1,” our 1600 Series offers a threaded
connection.
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Feel free to use two dissimilar fluids, as all circuits are
individually sealed eliminating “crosstalk.”
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| Operating Parameters |
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Max Pressure |
2900 psi |
200 bar |
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Max Temp |
250ºF |
120ºC |
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Max RPM |
1500 |
1500 |
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Features two circuits for use in a wide variety of applications.
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Offers the ability to use medium speed and pressure simultaneously.
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Comes standard with nickel plating, but is also available in all
stainless steel and with a hardened ceramic shaft.
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Available in sizes from ¼ ” to 1,” our 1650 Series offers a flanged
connection.
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Feel free to use two dissimilar fluids, as all circuits are
individually sealed eliminating “crosstalk.”
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| Operating Parameters |
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Max Pressure |
2900 psi |
200 bar |
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Max Temp |
250ºF |
120ºC |
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Max RPM |
1500 |
1500 |
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| SWIVEL
JOINTS |
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Threaded swivel joints for use in applications where complete
rotation is not necessary. Designed for swiveling or slow
rotation applications.
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Available in sizes from 1/4" to 3" and can be used at pressures up
to 725 psi (50 bar).
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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.
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Features nickel treated carbon steel construction. Stainless steel
models are also available.
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Operating Parameters
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| Max Temp |
392ºF |
200ºC |
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Max RPM |
60 |
60 |
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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 |
30 |
218 |
15 |
| 1 1/4" |
435 |
30 |
218 |
15 |
| 1 1/2" |
435 |
30 |
218 |
15 |
| 2" |
290 |
20 |
145 |
10 |
| 2 1/2" |
290 |
20 |
145 |
10 |
| 3" |
290 |
20 |
145 |
10 |
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Threaded swivel joints for use in applications where complete
rotation is not necessary. Designed for swiveling or slow rotation
applications.
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Available in sizes from 1/4" to 6," and can be used at pressures up
to 1160 psi (80 bar).
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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.
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Features nickel treated carbon steel construction. Stainless steel
models are also available.
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Our 1102 Series offers two ball bearings which allow for increased
pressure and speed.
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Operating Parameters
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| Max Temp |
392ºF |
200ºC |
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Max RPM |
90 |
90 |
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Standard Materials |
Stainless Steel |
| Size |
psi |
bar |
psi |
bar |
| 1/4" |
1160 |
80 |
435 |
30 |
| 3/8" |
1160 |
80 |
435 |
30 |
| 1/2" |
1160 |
80 |
435 |
30 |
| 3/4" |
870 |
60 |
360 |
25 |
| 1" |
870 |
60 |
360 |
25 |
| 1 1/4" |
580 |
40 |
290 |
20 |
| 1 1/2" |
580 |
40 |
290 |
20 |
| 2" |
435 |
30 |
215 |
15 |
| 2 1/2" |
435 |
30 |
215 |
15 |
| 3" |
435 |
30 |
215 |
15 |
| 4" |
290 |
20 |
145 |
10 |
| 5" |
290 |
20 |
145 |
10 |
| 6" |
215 |
15 |
115 |
8 |
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Perfect for very small envelope dimensions and slow or swiveling
rotation.
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Our 1200 Series features a female NPT inlet and a male NPT shaft at
90 degrees in a compact form.
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Our 1400 Series is available with a male shaft and either a male or
female inlet.
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Our 1400 Series is available in commonly used straight or tapered
thread forms, including SAE, NPT, JIC, DIN or ISO
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Both the 1200 & 1400 Series are nickel treated as standard and
are also available in stainless steel.
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| Operating Parameters |
| Max Temp |
392ºF |
200ºC |
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Std. Materials |
Stainless Steel |
| Size |
psi |
bar |
psi |
bar |
| 1/4" |
5075 |
350 |
2530 |
175 |
| 3/8" |
5075 |
350 |
2530 |
175 |
| 1/2" |
4350 |
300 |
2175 |
150 |
| 3/4" |
4350 |
300 |
2175 |
150 |
| 1" |
3625 |
250 |
1810 |
125 |
| 1 1/4" |
3625 |
250 |
1810 |
125 |
| 1 1/2" |
2900 |
200 |
1450 |
100 |
| 2 |
2900 |
200 |
1450 |
100 |
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Range in size from 2" through 12".
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Used in applications where slow rotation or swiveling motion is
needed.
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Suitable for use at pressures up to 290 psi.
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Standard models feature nickel treated carbon steel construction,
but are also available with a stainless steel shaft.
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Design features include a ball bearing for rotation, and a GR seal.
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Can be used in applications with temperatures up to 392° F (200° C)
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Operating Parameters
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| Max Pressure |
290 psi |
20 bar |
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Max Temp |
392ºF |
200ºC |
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Max Speed |
12 |
12 |
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High pressure Rotary Union® for use in hydraulic and
pneumatic applications.
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Equipped with a GR seal suitable for most transfer fluids.
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Designed for use in medium to high pressure applications (to 5075
psi)
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The high pressure capability of this series is obtained with the use
of a Single Acting Thrust Bearing which permits slow rotation.
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Operating Parameters
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| Max Pressure |
5075 psi |
350 bar |
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Max Temp |
248ºF |
120ºC |
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Max RPM |
80 |
80 |
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High pressure Rotary Union® for use in hydraulic and
pneumatic applications.
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Equipped with a GR seal suitable for most transfer fluids.
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Standard models feature nickel treated carbon steel construction,
but are also available in all stainless steel.
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Designed for use in very high pressure applications (to 10,150 psi)
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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 than our 1700 Series.
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Operating Parameters
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| Max Pressure |
10,150 psi |
700 bar |
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Max Temp |
248ºF |
120ºC |
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Max RPM |
100 |
100 |
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| SPECIALTY
JOINTS |
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Used in conjunction with the customer’s shaft and retaining sleeve.
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Available in two configurations for high speed, low pressure
applications, or high pressure, low speed applications.
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Standard models feature nickel treated carbon steel construction in
sizes from 20 mm to 100 mm.
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Also available in stainless steel.
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High pressure, low speed units can be used at pressures to 5800 psi
and speeds less than 100 RPM. The high speed, low pressure models can be used
at speeds to 3000 RPM, and pressures to 175 psi.
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Designed for use on continuous casting machines in steel mills.
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Can operate at speeds of 100 rpm and pressures of 148 psi
simultaneously
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Available in both single or dual flow, with a bronze or nickel
plated housing.
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Each series is equipped with a brass bushing to ensure smooth shaft
rotation at high temperatures.
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Offered in four basic types, as described in detail in our product
specifications.
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