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RX® Rotary Unions

RX Rotary Union
The RX rotary union uses a balanced seal with special ball bearing or optional tapered roller bearings to support the rotor.

This rotary union incorporates the latest technology in mechanical seal design for water and thermal oil service. The high thrust load capability and carbon-to-silicon (or Tungsten) carbide seal package makes the RX rotary union run longer and with less maintenance requirements that other ball bearing designs. All O-rings are fully captured in glands and seal-loading springs do not contact the process fluid. The RX rotary union features a barrier in the seal chamber to extend bearing life and a nipple and assembly plate made of stainless steel. Available in single- and dual-flow configurations and sizes from 3/8” to 6”, the RX rotary union is capable of operating up to 500°F (260°C), 360 psi (25 bar), and 3,500 rpm.


  • Balanced seal
  • Deep-groove ball bearings
  • Full flow area
  • External loaded springs
  • Matched seal faces
  • Integral nipple flange mounting
  • On-machine seal replacement


  • Long running life, dry running capability
  • High capacity for conventional applications
  • Low pressure drop

  • Uniform seal loading
  • Materials selected for specified service
  • Rigid mounting and accurate alignment
  • Reduced maintenance

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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Complete Solutions

From products and services to training and support, we can design, manufacture, install, and maintain your fluid handling systems. Partnering with us ensures your operations are fully integrated for maximum performance.