OVERVIEW

Duff Norton Rotary Unions

The Duff Norton Rotary Union® (sometimes referred to as Rotating Joints) is a sealing device that connects rotating equipment to fixed piping for the transfer of steam, water, hot oil, coolant, hydraulic oil, air, and other media – or just about any other type of transfer application from a stationary source to a rotating source. Duff-Norton's single, dual and multi-passage Rotary Unions® can be found in a variety of industries and applications including oil and gas, construction, off-road machinery, food and beverage, aerospace, robotics, and medical devices.

Features and benefits (options vary by product)

While rotary unions / rotating joints come in many shapes, sizes, and configurations, they typically have the same four basic components: housing, a shaft, a bearing (or bearings) and a seal.

• Mechanical Seal

  The seal inside the Duff Norton rotary union prevents the medium (water, oil, air, etc.) from leaking outside the rotary union while in operation.

• Bearing

  Duff Norton rotary unions may have only one or multiple bearings. The bearings are always used to allow a part of the joint, either the shaft or the housing, to rotate.

• Shaft

  The shaft is the component that carries the medium through the rotary union into the drum or roll. In many cases, the shaft will turn with the drum or roll. In some cases, like in larger flanged rotary unions, the shaft may be stationary while the housing rotates. The bearings and seal are typically assembled around the shaft.

• Housing

  The housing is the component that holds all of the other elements of the rotary union together. The housing may have one or more inlet / outlet ports depending on the application.

• Left hand / right hand thread option on the end of the shaft

  These options should be selected based on the direction of the rotating drum or vessel, or both may be used if on opposing sides of the same drum or vessel.

• Single or Dual flow configurations

  Either can be used for any type of Duff Norton rotary union pending the application demands.

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