The Most common design of Mechanical Face Seals is the FO design, also
called as ‘O’
Ring design, where ‘O’ Ring acts as the secondary sealing element. FO Type
Mechanical
Face Seal consist of 2 identical metallic sealing rings which seal against each
other on a
lapped seal face. The metallic Seal rings are precisely lapped to seal perfectly.
The seal is
designed so one of the two seal rings rotates while the other is stationary.