I raschiatori sono 2 anelli inseriti uno all’interno ed uno all’esterno dei seggi.
The scrapers are 2 rings inserted one inside and one outside the seats.
The scraper rings have to:
- Clean ball surface during valve operation
- Protect the seats from abrasion by fluid solid content
- Avoid wedging in of solids between seat and ball surface cause of valve blocking
- Reduce dirt that can fill body cavities.