Wiper seal

The function of a wiper seal (scraper)

A scraper is mounted in a hydraulic cylinder to scrape dust, dirt, moisture and other particles from the piston rod when it is retracted into the system. The seal therefore prevents damage to the rod, cylinder wall, seals and other components. Premature failure of the hydraulic system is also prevented by the scraper.

The wiper seal is the most undervalued seal in a hydraulic cylinder, despite its important function. The selection of the right profile shape and attention to the application area and operating conditions is extremely important. 

Wiper seal

Different materials 

Scrapers can be produced in many materials. The possibilities include:

A scraper in combination with a rod seal 

The combination of the rod seal and the scraper must be correct for the best sealing result. If an aggressive scraper is used with a less aggressive rod seal, leakage may occur. During the return stroke, the scraper can scrape away the microscopically thin layer of oil left behind in unevenness on the rod. This may cause leakage.

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