Pneumatic Rotary Unions

Pneumatic rotary unions, also known as rotary joints, are fittings used in pneumatic systems to enable rotation between parts. These rotary fittings sit between a stationary part and a moving part, allowing compressed air or gases to flow smoothly from one part to another and through the rest of the pneumatic system. For example, a rotary union might be installed between a pneumatic tube and a rotating drum.

Pneumatic rotary unions are suitable for high-pressure environments and are designed to withstand constant movement. They are generally made from stainless steel due to its corrosion resistance.

Rotary unions consist of:

• Housing
• Shaft
• Bearing
• Seal

How does a pneumatic rotary union work?

Rotary unions serve as the interface between static and moving parts. Compressed gas enters the pneumatic rotary union and is held inside the union as it rotates. When the valve openings align, the gas is released from the fitting. After the release, more gas enters the rotary union, and the cycle repeats.