Rotary unions and hybrid joints
Deublin 2600 multi-passage series (2620–2650, 2606–2608) rotary unions and hybrid joint
Multi-passage rotary unions with balanced mechanical seals carrying 2 to 8 separate media, such as coolant, dry air, cooling oil and hydraulic oil, for machine tool rotary tables and spindles; the 2606 is rated at 1,000+ rpm.
Key specifications
| Speed (max) | 1,000 rpm |
|---|---|
| Passages max | 8 |
| Media | coolant, dry air, cooling oil, hydraulic oil |
Summarised in our own words from HOERBIGER Group's published data; series maxima, individual models vary. Last checked 2026-10-30. Source 1 · Source 2
Notes on this data
Pressure and temperature not published.
Specify Motion is not affiliated with HOERBIGER Group. Deublin and 2600 multi-passage series (2620–2650, 2606–2608) are used only to identify the product. Comparisons use published figures; always confirm against the current datasheet.
Typical applications
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Our experienced engineers are on hand, ready to help with your project. Whether you need the Deublin 2600 multi-passage series (2620–2650, 2606–2608) itself, help sourcing it, or a modified or custom design built around your load, speed and space, tell us what the machine has to do and we'll come back with the right option.
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What a rotary unions and hybrid joint is
A rotary union, also called a rotary joint or swivel, transfers fluids such as compressed air, vacuum, hydraulic oil, water or coolant from a fixed supply into a rotating shaft or table. A rotating shaft runs inside a stationary housing, and each fluid passage is isolated by seals between grooves, so several media can pass through one unit. Many designs combine with an electrical slip ring into one assembly, providing both fluid and electrical paths through continuous rotation.
When engineers choose a rotary unions and hybrid joint
Choose a rotary union when pneumatic grippers, vacuum cups, hydraulic clamps or cooling circuits sit on a rotating part. The alternative of hoses limits rotation to a few turns. The trade-offs are seal friction, leakage and wear: seal choice sets pressure, speed and media compatibility, and dry running damages some seals. Mixing vacuum and pressure in one unit needs suitable seals. Combining the union with a slip ring saves space but makes the assembly larger and more application-specific.
How to specify the Deublin 2600 multi-passage series (2620–2650, 2606–2608)
Send these with your enquiry and an engineer can confirm the right 2600 multi-passage series (2620–2650, 2606–2608) variant or an equivalent:
- Number of passages and the medium in each
- Pressure and vacuum levels (bar)
- Flow rate or port size (l/min, mm or BSP)
- Fluid temperature (°C) and compatibility
- Speed (rpm)
- Permitted leakage and drain or vent provision
- Electrical circuits if combined with a slip ring
Common mistakes to avoid
- Running a union designed for lubricated media on dry air or without flow
- Not providing a leak drain between media and the electrical section of a combined unit
- Applying side load from rigid pipework instead of using flexible hoses and a torque arm
- Ignoring pressure spikes from valve switching when choosing seals
Deublin 2600 multi-passage series (2620–2650, 2606–2608): frequently asked questions
What is the Deublin 2600 multi-passage series (2620–2650, 2606–2608)?
Multi-passage rotary unions with balanced mechanical seals carrying 2 to 8 separate media, such as coolant, dry air, cooling oil and hydraulic oil, for machine tool rotary tables and spindles; the 2606 is rated at 1,000+ rpm. Published series figures include speed 1,000 rpm. It is made by HOERBIGER Group; Specify Motion can help source it or propose an equivalent.
Who makes the Deublin 2600 multi-passage series (2620–2650, 2606–2608)?
The Deublin 2600 multi-passage series (2620–2650, 2606–2608) is made by Deublin (HOERBIGER Group) and is listed here for engineers comparing options. Specify Motion is not affiliated with HOERBIGER Group; brand names are used only to identify the product.
What is the speed of the Deublin 2600 multi-passage series (2620–2650, 2606–2608)?
The published series maximum speed is 1,000 rpm. Individual models and sizes in the 2600 multi-passage series (2620–2650, 2606–2608) range vary, so check the exact variant against your duty cycle, mounting and environment, or ask our engineers to confirm the right size for you.
Is there an alternative to the Deublin 2600 multi-passage series (2620–2650, 2606–2608)?
Yes. Our engineers can propose an equivalent built around your load, speed and environment. An engineer confirms the fit against your application before recommending anything.
Can one rotary union pass air, vacuum and water at the same time?
Yes, multi-passage rotary unions isolate each medium in its own groove with seals between them. Each passage must be specified with its medium, pressure and flow, because seals that suit air may not suit water or vacuum. Leakage paths between passages and a drain for any seepage should be agreed with the supplier.
How is a rotary union combined with a slip ring?
A common layout puts the rotary union on the axis and the electrical slip ring around or beside it in a single assembly, so both fluids and electrical circuits pass through one rotating connection. The design must keep fluid away from the electrical rings, often with a drain chamber. Specify both parts together so the supplier can manage sealing, length and bearing loads.
Further reading: How to select a rotary union · How to select a slip ring · Slip rings
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