Comparison

Air Bellow Guide

HDU Guide (Goong)

Maintenance

Replace the air bellow and support (bearing) wear parts once a year

High maintenance requirements

Replace seal of cylinder every 5 years,

and regularly lubricate and maintain it

Low maintenance requirements

Reliable

Sliding, more parts worn

Usually requires a higher working air pressure (5 bar or higher)

No protective measures to deal with sudden air stopping, low reliability

Insufficient support and holding strength for the guide roll, and vibration due to fluctuations in air pressure at both sides

Swing around the pivot shaft with little wear

Compact and sturdy structure

Air cylinder actuation with spring, higher support and holding strength for guide roll, reducing the chance of vibration

Lower operating pressure: 3.5 bar is safer

With spring protection for sudden air stop, high reliability