Dynamic applications

#1 What is meant by a dynamic application?

In a dynamic application, the O-ring seal moves. In a static application, the O-ring seal does not move.

The type of movement can also be divided into rotational and translational movements.

Rotatory: Rotating movement (example: shaft)

Translational: Back and forth movement (example: hydraulic cylinder)

Important: When designing a dynamic O-ring, the higher load must be taken into account. As the O-ring is constantly in motion, it is exposed to significantly higher friction.

#2 How can the service life of a dynamically installed O-ring be extended?

1. Due to the higher friction, the compression should be slightly lower than with a static seal. (approx. 5-10%)

2. Choose a material that generally does not need to be pressed so hard. (E.G. FFKM)

3. In dynamic applications, the O-ring should always be generously lubricated during assembly.

4. Use materials that naturally do not adhere well to other materials. Therefore, avoid materials such as VMQ (silicone).

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