This type of shaft seal is used mainly on vertical pumps, to protect the anti-friction bearings from water splashes. Different lip rings made of different materials can be used.
So for example a friction optimised shaft seals are used, and also pretensioned PTFE lips, which rotate on hardened shaft sleeves. For horizontal pumps the quench chambers are usually sealed by single acting mechanical seals with a lip ring. This sealing principle is also applied as stationary sealing for hydrodynamic shaft seals.
