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Deublin Rotary Unions, Joints, & Swivels
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| Since 1945, Deublin has grown from a small garage shop to the world’s largest manufacturer of rotary unions (rotating unions). Rotary unions must accommodate a broad range of materials, viscosities, temperatures, pressures and speeds. That’s why the Deublin rotary union product line offers over 500 standard rotary unions, over 3,000 separate models, and over 6,000 individual components. | |
Rotating Unions (also known as rotary swivels, rotary couplings, rotary joints) are precision mechanical devices used to transfer fluid from a stationary source, such as a supply pipe, into a rotating piece of machinery.
All Deublin rotary unions feature balanced seal technology for less wear and longer service life and precision lapped seal faces to assure a positive seal. All unions are self-supported with the exception of bearingless coolant unions. Learn More >
Deublin Offers:
Water and Hot Oil Unions:
- Port connection thread sizes from 3/8” to 4”
- Rotors available with thread or flange connection
- Single or two passage designs
- Multiple seal combinations to accommodate various media and operating conditions
- Water pressure ratings up to 4,000 PSI
- Saturated steam pressure ratings up to 15 PSI (intermittent)
- Hot oil pressure ratings up to 100 PSI
- Temperature ratings up to 250°F
- Speed ratings up to 3,500 RPM
- Cartridge seal models available for easy and quick on-the-machine replacement of seal components
- Stainless steel models available for applications such as food, chemical, and pharmaceutical
- Special in-the-shaft mounted models for use in continuous casting applications
Steam and Hot Oil Unions:
- Port connection thread sizes from 3/8” to 5”
- Rotors available with thread or flange connection
- Single or two passage designs
- Dual bearing models available for extended service life
- Steam pressure ratings up to 250 PSI
- Hot oil pressure ratings up to 100 PSI
- Temperature ratings up to 400°F steam, 450°F hot oil
- Speed ratings up to 750 RPM
- Models with seal wear indicator available for preventative maintenance
Air and Hydraulic Unions:
- Port connection thread sizes from 3/8” to 1.5”
- Rotors available with thread or flange connection
- In-the-shaft mounted models available for minimum overhang
- Single or up to five passage designs
- Some models can flow coolant
- Multiple seal combinations available
- Air pressure ratings up to 150 PSI
- Vacuum ratings down to 28” Hg
- Hydraulic pressure ratings up to 6,400 PSI
- Speed ratings up to 12,000 RPM
Coolant Unions:
- Port connection thread sizes from 1/4” to 3/8”
- Rotors available with thread and flange connection
- Single passage design
- Pressure ratings up to 2,000 PSI
- Temperature ratings up to 250°F
- Speed ratings up to 20,000 RPM (up to 45,000 RPM at sub-maximum pressure)
- Bearingless models available (no bearing-imposed speed limits, externally supported)
- Available with “pop-off” seals (seals separate in absence of media pressure to eliminate friction and wear during dry running)
Unions for Special Applications:
- Cool and activate clutches and brakes
- Central Tire Inflation Systems
- Around-the-shaft mounted unions for air or hydraulic service
Rotary Union information
Precision Rotating Connections for Water, Steam, Air, Hydraulic, Vacuum, Coolant & Hot Oil Service.
A rotating union is a special and unique product because it must often be capable of containing very high pressures, while rotating at very high speeds. This is only possible through the close to perfect mating of the seal faces. These micro-lapped seals must rotate smoothly and easily with minimum friction to assure long life and not leak. At Deublin these critical requirements are met by a combination of exclusive design principles, the most modern machining techniques, and a step-by-step program of inspection and testing to assure that every rotating union meets our tough quality standard.
Exclusive Deublin Design Features
There was a time before Deublin's advancements in seal design when rotating unions were referred to as "pressure joints."
This name came from the pressure seal principle used to maintain seal contact. On the surface the theory seems sound. After all, the logic was as pressure increased, so did the forces holding the seals together. More pressure should equal tighter, better sealing. However, more pressure on the rotating seal face also means more friction, higher torque and more wear. That's why Deublin developed "Balanced Sealing." This simply means the load or pressure on the seal faces is kept to a minimum regardless of media pressure, resulting in a freer turning union and longer seal life. The spring loaded floating seal is keyed so that it cannot rotate or creep as this can cause premature failure of the O-ring or TFE wedge, resulting in a leaking union.
R.M. Hoffman Company Custom Applications:
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| Plastic Rotating Union and Stainless Slip Ring | Rotating Union and Mercury Slip Ring |
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| Applied Materials CMP |