Consist of two basic parts called faces. One face rotates with the shaft, while a second is held stationary in the pump housing. The primary seal is created between these two seal faces. https://youtu.be/xeKfFxNQCr0?feature=shared">Click here to view the Pump Report on this topic.

Mechanical seals prevent liquid leakage by creating a hydrodynamic liquid film between two highly finished surfaces.