This type of shaft sealing is used mainly in vertical pumps in order to protect the anti-friction bearings from water splashes. Different lip rings made of various materials can be used. Thus for example friction optimised shaft seals are used and also pretensioned PTFE lips which then rotate on hardened shaft sleeves. Depending on the application several lip rings can also be fitted one behind the other.
The intermediate spaces can then also be furnished with a grease lock. ith horizontal pumps the quench chambers are usually sealed by single acting mechanical seals with a lip ring. This sealing principle is also put to use as a station which seal for hydro-dynamic shaft seals.
