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The Kadant Blog

Are Your Current Water, Oil, or Air Rotary Unions Being Discontinued?

Do you know that DP and DX rotary joints are being discontinued by their manufacturer? You can replace them in your industrial machinery with Kadant Johnson R and RX rotary unions.

We Have a Solution

R™ and RX® rotary unions (joints) are known for their adaptability to other rotary joint applications. R and RX rotary joints are compatible with DP and DX/DXS rotary joints and offer a pin-to-pin replacement solution.*

If you are looking for a simple and reliable rotary joint to transfer heating or cooling fluid through the cylinders of your industrial process, you should consider Kadant Johnson's R or RX rotary joints.

r rx 2


R & RX rotary joints bring many benefits. Here are five:

1. Adaptability

R and RX rotary joints can handle different fluids for many applications. They are versatile and perfectly compatible with the DP and DX Series rotary unions.

2. Available Immediately

Choose from a wide range of R and RX rotary unions, available directly from stock or with extremely short lead times.

3. Ease of Maintenance

The special design of the R and RX unions allows you to perform maintenance without removing the rotary union from the machine. This saves valuable time and resources.

4. Quality Construction

A characteristic feature of R and RX unions is that the seal-loading springs do not contact the process fluid, lowering the risk of leakage and extending the life of the union.

5. Performance

R and RX rotary unions can operate in environments with temperatures up to 260°C (500°F), handling pressures up to 50 barg (725 psi) and achieving rotational speeds up to 3,500 rpm.


R and RX rotary unions are designed to provide outstanding performance for a wide range of applications in different industries including:

  • Chemicals/Pharmaceuticals
  • Rubber and Plastics
  • Food and Beverage
  • Printing/Converting/Flexo
  • Textiles

The R and RX rotary unions use a balanced seal with special ball bearings or optional tapered roller bearings to support the rotor. These rotary unions also incorporate 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 make the R and RX rotary unions run longer and with fewer maintenance requirements than other ball-bearing designs.


  • The RX rotary union is capable of operating up to 500°F (260°C), 360 psi (25 bar), and 3,500 rpm
  • The R rotary union is capable of operating up to 355°F (180°C), 725 psi (50 bar), and 3,000 rpm
  • Sizes available from 3/8" to 6"
  • Single and double passage
  • Rotating or fixed syphon
  • Threaded or flanged connections

Kadant Johnson's rotary unions are the ideal solution for fluid handling in your industrial applications.

For more information, please contact us atThis email address is being protected from spambots. You need JavaScript enabled to view it.

* Compatibility for each rotary union must be checked with our experts depending on the stationary or rotating syphon

  • Written by:
    Victor Caronni

    Victor Caronni

    Marketing Manager, Kadant Johnson Europe

© Kadant Inc.