Hydraulic Wear Rings & Guide Rings

Wear rings or guide rings provide a bearing surface to center the piston and rod dynamic surfaces in a reciprocating cylinder application. The guide ring prevents metal-to-metal contact and improves seal life performance. 

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Hydraulic Wear Rings & Guide Ring Applications

• Packaging Filling Machine 
• Hydraulic and Pneumatic Cylinders 
• Medical Pumps / Compressors
• Aerospace Pumps / Compressors 
• Industrial Booster Pumps
• Cryogenic Pumping Systems

Hydraulic Wear Ring Benefits

 What Are Guide Rings?

Non-cut Wear / Guide Ring Used primarily in piston and rod application under .500 inches in diameter. RFQ Angled Wear / Guide Ring Standard design for most guide ring applications for Piston and Shaft guidance.
Used for improving bearing stress at the gap RFQ Butt Wear / Guide Ring Used in applications not requiring an angle cut design. RFQ Step Joint Wear / Guide Ring Use to help provide piston guidance and help reduce pressure pluses on the piston seal RFQ

Hydraulic cylinders are designed to generate longitudinal force and handle the longitudinal load. But many of these cylinders are also impacted severely by the transverse load. The engineering rule of thumb says that about 10-15% of the hydraulic force is always applied as transverse load, even in the most ideal situation.

The mechanical impact of this load can be reduced by using a variety of techniques but radial load still exists and occurs, causing excessive wear of internal guide components (bearing components) in the glands and on the piston heads of the cylinders.

Enter: Hydraulic Wear Rings

The use of internal guiding components or 'wear rings' can dramatically reduce the impact of radial load, especially in horizontal and long-stroke applications. These rings can ensure that sliding components of the cylinders are properly supported against radial loads and move properly guided in a longitudinal direction.
A correctly designed bearing system in combination with the proper non-metallic wear ring material can prolong the lifetime of the seal components, improving both the reliability and service life of the cylinders.

For more information, please visit Piston Wear Ring.

The functions of guide components in hydraulic cylinders include:

1. Act as a linear (longitudinal) guide for the moving metallic components in the cylinders
2. Provide radial support of the metallic components
3. Protect seal components against excessive mechanical radial force/load and deformation
4. Protect seal components against uneven wear out
5. Position moving metallic components in a concentric location, maintaining clearances/radial gaps
6. Protect seal components against the radial load-caused momentum

Wear Ring Choices

Traditionally ferrous and non-ferrous metallic guide components were used as bushings for rods/rams and piston heads. The typical ferrous bearing material was gray cast iron (various grades), while non-ferrous was bearing bronze (various grades). However, these guide types have been found to be problematic and costly over the long term.

High-performance non-metallic wear rings such as Chesterton 16K and 17K are the best choice to protect seal components against excessive radial force, mechanical damage, and transverse load momentum in the cylinders.

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