Design category for seals with a pronounced lip. The main examples are grooved ring seals with one or two lips (Figure L 23), as well as roof-shaped seals and lip seals — although the latter are not used very often now.
Lip seals are generally designed to be undersized or oversized both inside and out, which produces the required preload during installation.
![95440923d2654b0a3f7412990211855ed419a901 0001_lippendichtung.gif](/fileadmin/smc/files/95440923d2654b0a3f7412990211855ed419a901.gif)
Figure L 23: Lip seals