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Over-the-Shaft Rotary Unions

Over-the-Shaft Rotary Unions
Over-the-shaft (OTS) rotary unions are used with roll journals that contain internal passages and require fluid conveyance through the journal into the roll.

An OTS rotary union seals around the journal and transfers fluid in and out of the passages as the journal rotates.

OTS rotary joints are most common in applications where the fluid conveyance occurs at the same end as the drive system. The number of inlet and outlet ports on an OTS rotary joint and the seal technologies used are matched to the roll journal and application. OTS rotary unions can be custom-engineered for any journal size and performance requirements to supply water, steam, air, or other fluids.

DuraSeal™ Seal

  • Applications: Medium-pressure, low-speed

  • Pressure: 150 psig (10 bar)

  • Temperature: 200°F (93°C)

  • Rotation speed: Up to 4 rpm

  • Elastomeric seals
  • Advanced surface treatments/coatings

Mechanical seal

  • Applications: Low-pressure, high-speed

  • Pressure: 60 psig (4 bar)

  • Temperature: 150ºF (66°C)

  • Rotation speed: Up to 200 rpm

  • Mechanical seals
  • Advanced surface treatments / coatings

Pressure seal

  • Applications: Steam heating

  • Pressure: 150 psig (10 bar)

  • Temperature: 400ºF (200°C)

  • Rotation speed: Up to 50 rpm

  • Mechanical seal technology

Custom Solutions

Have an application that requires a specialized solution? Kadant Johnson’s product innovation team focuses on making the best solution in the shortest time possible. Kadant Johnson’s engineering team is committed to providing technology that meets customers’ application demands. Our goal is to work closely with our customers to develop reliable, efficient, and technically advanced products that add value by improving the process and the quality of the end product.

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FAQ

What fluids can OTS rotary unions handle?

OTS rotary unions can be designed for water, steam, condensate, oil, glycol, and other industrial fluids depending on the application requirements.

What is the difference between elastomeric and mechanical seals?

Elastomeric seals are commonly used in lower-speed applications, while mechanical seals are designed for higher speeds, higher temperatures, or more demanding operating conditions.

When are pressure mechanical seals used?

Pressure mechanical seals are typically used in steam and condensate applications where elevated temperatures and pressures require more robust sealing technology.

What industries use OTS rotary unions?

OTS rotary unions are widely used in metals processing, pulp and paper, converting, rubber, plastics, and other industrial manufacturing applications involving heated or cooled rolls.

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OTS Rotary Union Brochure
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