Duff-Norton Rotary Unions
We offer 3 options for Rotary Unions:
- General Purpose
- Multi-Port
- Steam & Hot Oil
General Purpose Rotary Unions
MEDIA: Air, Water
PRESSURE: 117 PSI
TEMPERATURE: 250ºF (122ºC)
SPEED: 3500 RPM
MATERIAL: Nickel Plated Steel
THREADS: 1/8 inch to 1/4 inch NPT, Machine thread, BSP and BSPP available
- Ideal for high speed air and water applications with space constraints.
- All steel parts are nickel plated steel for corrosion resistance.
- Small envelope dimensions make the 300 Series suitable for use in applications with space constraints.
General Purpose Rotary Unions
MEDIA: Water, Non-Corrosive Fluids, and Oil
PRESSURE: 200 psi (1.38 MPa), 180 psi - 2 inch size only (1.24 MPa)
TEMPERATURE: 158°F (70°C), 159°F (71°C - 100°C): Reduce pressure rating 15%
SPEED: 1750 RPM, 1750 - 3500 RPM: Reduce pressure rating 20%
MATERIAL: Silicon carbide with carbon graphite seal faces
THREADS: 1/2 Inch to 2 Inch NPT, BSP & BSPP Available
- Silicon carbide / carbon graphite seal faces provide long service life.
- High precision ball bearings for smooth running and long life, even at high speeds.
- Internal bearing protection and vented body to prevent lubricant washout.
- Aluminum housing with stainless steel shaft.
- No maintenance required.
- Cost effective for general purpose applications.
General Purpose Rotary Unions
MEDIA: Water, Steam, Hot Oil, and Air
PRESSURE: 750 / 120 / 300 PSI
TEMPERATURE: 300ºF (149ºC) / 350ºF (177ºC) / 395ºF (202ºC)
SPEED: 1000 RPM
MATERIAL: 300 grade stainless steel
- Corrosion Resistant - 300 grade stainless steel construction for superior corrosion resistance.
- Long Service Life - Two precision bearings keep the seal faces perfectly aligned for long service life.
- Dual Flow Option - With the addition of an elbow, the 5000 Series can become dual flow.
- Balanced Mechanical Seal Design - The balanced mechanical seal design allows for optimal operation with a wide variety of media.
- Replaceable Cartridge - Integrated cartridge design makes repairs fast and easy, reducing maintenance costs.
Multiple Seal Design Options
5000 Series (Standard)
Carbon graphite against a ceramic coated steel seal design offers long life
5000 ASM Series
Duff-Norton’s Advanced Seal Materials (ASM) seal for abrasive applications, where softer sealing faces are subject to grooving. The ASM seal is a tungsten carbide face ring against a siliconized graphite seal ring, offering unsurpassed protection against grooving in applications where other materials fail.
General Purpose Rotary Unions
MEDIA: Water, Steam, Hot Oil
PRESSURE: 250psi (Water), 175 psi (Steam), 100 psi (Hot Oil)
TEMPERATURE: 375ºF (190ºC)
SPEED: 700 RPM
MATERIAL: Cast iron housing with stainless steel or plated sleeve
THREADS: 1/4 Inch to 3 Inch NPT, MT, BSP, and flanged connection available
FEATURES & BENEFITS
ADVANCED SEALING SYSTEM
The Bellows Sealing System provides superior sealing performance throughout the wear life of the Rotary Union.
SUPERIOR ALIGNMENT
Dual bearings available in all sizes over 1-1/4 inch to provide superior alignment.
RESISTS DEBRIS BUILD-UP
Compared to seals utilizing springs, the 9000 series bellows sealing system is more resistant to debris in contaminated media, which reduces clogging.
EASY MOUNTING
The flange attaches directly to the machine journal, providing inherently concentric mounting, minimizing overhang, and partially relieving bearing load to increase service life.
General Purpose Rotary Unions
MEDIA: Water, Air and Hydraulic Fluid
PRESSURE: 3625 PSI
TEMPERATURE: 250ºF (122ºC)
SPEED: 1500 RPM
MATERIAL: Nickel treated carbon steel construction or stainless steel
THREADS: 1/4 inch to 1 inch NPT or MT, BSP & BSPP Available
FEATURES & BENEFITS
TWO CONFIGURATIONS OFFERED
Either axial (straight through) nickel plated housing or radial (90 degree) inlet with aluminum housing for maximum flexibility.
HIGH SPEEDS
Suitable for speeds up to 1,500 RPM.
WIDE RANGE OF SIZES
Available in sizes from 1/4 in. to 1 in. NPT and MT.
BI-DIRECTIONAL ROTATION
The 600 Series is equipped with a GR seal design that allows bi-directional rotation.
Multi-Port Rotary Unions
MEDIA: Water, Air and Hydraulic Fluid
PRESSURE: 170 psi (HSMC), 5,880 psi (HPMC)
TEMPERATURE: 248ºF (120ºC)
SPEED: 3,000 RPM (HSMC), 180 RPM (HPMC)
MATERIAL: Nickel plated steel
THREADS: 3/8 Inch to 3/4 Inch NPT or BSP
FEATURES & BENEFITS
HIGH PRESSURE OR HIGH SPEED APPLICATIONS
Duff-Norton multi-port rotary unions are available in both high pressure (HPMC Series) and high speed (HSMC Series) configurations.
PRESSURES UP TO 5,880 PSI
HPMC Series 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.
AVAILABLE UP TO 8 PORTS
HSMC Series rotary unions are available with up to four ports as standard. HPMC Series Rotary Unions offer up to eight ports as standard.
SPEEDS UP TO 3,000 RPM
HSMC Series is perfect for low pressure applications, up to 170 psi with rotational speeds up to 3,000 RPM.
NO CROSS CONTAMINATION
All circuits are individually sealed eliminating cross contamination. A variety of fluids can be used simultaneously.
Multi-Port Rotary Unions
MEDIA: Water, Air and Hydraulic Fluid
PRESSURE: 2900 PSI
TEMPERATURE: 250ºF (122ºC)
SPEED: 1500 RPM
MATERIAL: Nickel plated steel (Also available in stainless with a hardened ceramic shaft for higher speed and longer life.)
THREADS: 1/4 Inch to 1 Inch NPT, BSP & BSPP Available
FEATURES & BENEFITS
TWO PORT DESIGN
The 1600 Series rotary union features two ports and is ideal for use in a wide variety of applications.
CORROSION RESISTANT
Nickel plated steel for corrosion resistance. Also available in all stainless steel and with a hardened ceramic shaft for higher speeds and longer life.
MEDIUM SPEED & MEDIUM PRESSURE CAPABLE
This design provides the ability to use medium speed and pressure simultaneously.
NO CROSS CONTAMINATION
All circuits are individually sealed eliminating cross contamination. A variety of fluids can be used simultaneously.
Multi-Port Rotary Unions
MEDIA: Water, Air and Hydraulic Fluid
PRESSURE: 2900 PSI
TEMPERATURE: 250ºC
SPEED: 1500 RPM
MATERIAL: Nickel plated steel (Also available in stainless with a hardened ceramic shaft for higher speed and longer life.)
THREADS: 1/4 Inch to 1 Inch NPT, BSP & BSPP Available
FEATURES & BENEFITS
TWO PORT DESIGN
The 1650 Series rotary union features two ports and is ideal for use in a wide variety of applications.
CORROSION RESISTANT
Nickel plated steel for corrosion resistance. Also available in all stainless steel and with a hardened ceramic shaft for higher speeds and longer life.
MEDIUM SPEED & MEDIUM PRESSURE CAPABLE
This design provides the ability to use medium speed and pressure simultaneously.
NO CROSS CONTAMINATION
All circuits are individually sealed eliminating cross contamination. A variety of fluids can be used simultaneously.
Steam & Hot Oil Rotary Unions
MEDIA: Water, Hot Oil and Air
PRESSURE: 150 psi (Water), 100 psi (Air & Hot Oil)
TEMPERATURE: 375ºF (190ºC) / 550ºF (288ºC)
SPEED: 500 RPM
MATERIAL: Cast iron housing, steel shaft
CONNECTIONS: 2 Inch to 4 Inch ASA Flange
FEATURES & BENEFITS
HEAVY DUTY DESIGN
Designed with two ball bearings spaced to withstand radial and thrust loads.
NO LEAKAGE IN TOUGH APPLICATIONS
Compression springs in the 2000 Series provide even loading across the seal surfaces to maintain zero leakage even in low pressure applications.
EASY MAINTENANCE
Designed with an integral flange that allows repairs without removing the housing from the machine.
EASY MOUNTING
The flange attaches directly to the machine journal, providing inherently concentric mounting, minimizing overhang, and partially relieving bearing load to increase service life.
Steam & Hot Oil Rotary Unions
MEDIA: Steam and Hot Oil
PRESSURE: 175 psi (Steam), 100 psi (Hot Oil)
TEMPERATURE: 450ºF (232ºC) Steam / 600ºF (316ºC) Hot Oil
SPEED: 600 RPM
MATERIAL: Cast Iron Housing with Stainless Steel Sleeve, Steel Shaft with Hardened Nickel Plating
THREADS: 2 Inch to 4 Inch NPT, BSP or ISO228 Available, Quick Release
FEATURES & BENEFITS
IDEAL FOR STEAM APPLICATIONS
Designed for operation in a variety of steam applications.
SAFETY
An anti-torque lug prevents rotation of the housing while in operation.
NO LUBRICATION NEEDED
The special carbon graphite bearing is lubricated by the process fluid and requires no additional lubrication.
HOT OIL APPLICATIONS
8000HO offers the same design features as the standard 8000 Series but with a special high temperature seal ring for hot oil applications.
STAINLESS STEEL INSERT
The stainless steel housing insert in the 8000T Series makes this joint a favorite in the textile industry
Steam & Hot Oil Rotary Unions
MEDIA: Water, Steam and Hot Oil
PRESSURE: 250 psi (Water), 175 psi (Steam), 100 psi (Hot Oil)
TEMPERATURE: 600ºF (Hot Oil) / 378ºF (Steam)
SPEED: 700 RPM
MATERIAL: Cast iron housing with stainless steel or plated sleeve
THREADS: 1/4 Inch to 3 Inch NPT, BSP Threads Available, Flange
FEATURES & BENEFITS
SUPERIOR SEALING PERFORMANCE
Bellows Sealing System provides superior sealing performance throughout the wear life of the Rotary Union.
DESIGNED FOR DIRTY MEDIA APPLICATIONS
Debris in contaminated media will not be captured in the Bellows Sealing System, which reduces clogging.
MAINTENANCE FREE
The 9000G is maintenance free because there is no rolling element bearing, therefore no lubrication is required.
HIGH TEMPERATURE APPLICATIONS
Offers the same design as the standard 9000 Series, but utilizes carbon graphite bearings for high temperature applications.
IDEAL FOR HIGH TEMPERATURES
The thrust collar allows for thermal expansion, making this an ideal union for high temperature, general purpose applications.
FLANGED MOUNTED UNITS AVAILABLE
Consult Factory.