Wiper seal with pressure-relief function: Zurcon® Scraper DA24
An innovative hydraulic venting wiper seal is featured in this video.
Zurcon® Scraper DA24 is a double-acting scraper made of Trelleborg Sealing Solutions proprietary polyurethane. The Venting Version is a unique seal that incorporates pressure-relief through axial holes to prevent system failure. The seal gives excellent scraping performance and superior protection against ingress of external media.
This film is also available in High Definition (HD) so you may watch it in full screen mode after setting it to 720p.