A Short Overview of Pneumatic Rotary Union

A rotary joint or pneumatic rotary union is a fitting that is used to enable smooth rotation between a static and a rotational part in a pneumatic system.

A pneumatic rotary union ensures that air or gaseous matter can flow easily through different parts of the pneumatic system.

Parts or Components

Pneumatic rotary unions are generally made of stainless steel to ensure the smooth mobility of the movable part. They are made of four components:

  • Housing
  • Shaft
  • Bearing
  • Seal

Function

The primary function of pneumatic rotary unions is transporting steam, gases, or any other media to different parts of the machines. 

Working Principle

Pneumatic rotary unions are generally sealing devices. They connect the gas input from the pipeline to the rotating equipment and then discharge steam or gases. These unions work by swirling compressed air through a fixed point. It ensures that the air is not leaking out. 

A rotating element is mounted on the shaft of a rotating machine called a rotor. The stationary part connected to a compressed air source is called a stator. The compressed air flows through the channels of the rotor and stator. The compressed air flows through the tracks in the stator and is then delivered to the channels in the rotor.

Types of Pneumatic Rotary Unions

There are two types of rotary unions:

  1. Simple rotary joints
  2. Combined rotary joints

Features

  • High Speed: They can operate at high speeds ranging up to 10,000 RPM.
  • Low Torque: Due to the low friction seals, they have low torque requirements.
  • Compact Design: These unions come in a compact design, and you can fit them into small spaces.
  • Low Maintenance: They are highly durable and do not require much attention for maintenance.

Applications of Pneumatic Rotary Union

Pneumatic rotary unions are applied in different industries and are widely used for the smooth rotation and transmission of gases. Hydraulic power pack uses rotary joints for air transmission. Check the list below to see their other applications:

  • Robotics 
  • Packaging
  • Textile Industry 
  • Machine tools

Conclusion

In short, Pneumatic rotary unions are inevitable machine parts of any portable machine. The Hydraulic power pack and other industries require this durable machine part.

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