Sealing mechanism

Calculating the sealing gap height 

Key:      A/E: Reversal points      dp/dx: Compression      gradient (over the length      of the sealing gap)      pa: Pressure/working pressure      ua: Velocity      h: Sealing gap height      wa: dp/dx max

The rod seal is tight, if the oil film dragged outside is dragged in again.

Lubricating film heights when driving the rod in and out:

      

Leakage per double stroke (= rod driven in and out, H = stroke length)

Principle and terminology
relating to a rod seal prior to installation

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