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Multi-Passage Soft Seal




A rotating union connects a stationary pressurized supply line to a rotating machine part such as a cylinder, roll, spindle, clutch, etc. It can be used to convey virtually any liquid or gas: steam for heating, water or water/glycol solutions for cooling, hydraulic fluids, cutting fluids, air, inert gas, or even vacuum. The task becomes more complicated when more than one media must be conveyed simultaneously. This is the role of a multi-passage union – to provide multiple, independent passages for the same or several different media to different rotating feed points within the same axis.

Typically, each passage is isolated from all other passages and different media are not allowed to mix. The key to reliable function of a multi-passage union thus lies in the sealing technology. Different seal types are dictated by the operating conditions – temperature, pressure, rotation speed, torque, medium chemistry and passage size.

Typical Applications for Multi-Passage Unions

  • Steel industry: ladle turrets for continuous casting operations
  • Plastics & rubber industries: injection and rotary molding operations
  • Machining operations: workholding and clamping functions 
  • Aerospace manufacturing and flight simulators
  • Industrial cranes
  • Rail transportation
  • De-scaling operations
  • ...and many more


DEUBLIN Multi-Passage Sealing Solutions

Deublin Multi-Passage Soft-Seal unions are optimized for the operating parameters of the application such as speed, torque, media pressure, operating temperature, physical size and other factors. Hardened chrome sealing surfaces are standard to ensure minimal wear and long service life.

Tandem Rotating Union With Plastomeric Seals


DEUBLIN Product Definition

Deublin Multi-Passage Soft-Seal rotating unions can be used in the widest variety of applications and media. Typical media includes the following:

  • Hydraulic Oil
  • Water
  • Water-Glycol
  • Air (dry/lubricated)
  • Nitrogen
  • Argon
  • Grease
  • Coolant
  • Cutting Oil
  • Vacuum
For media not listed above, please contact Deublin.
Deublin offers Multi-Passage Soft-Seal rotating unions that are standard, semi-custom and custom. When possible, Deublin recommends standard models, but will recommend semi-custom or custom models depending on the unique requirements of each application.
Semi-Custom unions can have different port sizes on the same union, SAE port connections and/or larger center bore (up to 50 mm). Custom unions have no limitation on dimensions, port sizes, port connection specifications and center bore dimensions.
  • Ports/Passages: 2 to 8
  • Sizes: 1/8” to 1/2”, NPT or BSP
  • Materials of Construction:
    • Flanged rotor: AISI 420 with aluminum housing
    • Bearings: dual, widely-spaced ball bearings ensure smooth running and minimize impact of potential side-loading
  • Optional center bore up to 25 mm (1”) for electrical slip ring wires


Examples of Applications

Deublin designs and manufactures a complete range of rotating unions from simple, single channel models used to prevent flex-hoses from twisting, to 12-port unions used on machine tool index tables, to massive, multi-channel unions used for ladle turrets in continuous casting machines. Deublin Multi-Passage Soft-Seal unions are used in applications that may require air, water, oil,  grease, argon and other media.




Application:  Machine Tool
Passages:  12


Application: General
Passages: 4 + 1 drain


Application:  Machine Tool index table
Passages:  8 with large center bore


Application:  Ladle Turret
Passages:  22


Application:  Index Table
Passages:  16


Application:  Steel Plant
Passages:  5 with large center bore


Application:  Coil Winding
Passages:  6


Multi-Passage Soft-Seal unions can be combined with Electrical Slip Rings



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Welcome to Deublin.com!

Since 1945, Deublin has grown from a small garage shop to the world’s largest manufacturer of rotary unions (rotating unions). Our worldwide distribution network allows OEM’s all over the world to specify Deublin rotary unions when purchasing equipment made in another country. Wherever you’re located, Deublin has a stocking distributor nearby to meet your fluid handling requirements—quickly. 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 more than 6,000 individual components to handle them.

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