Double Seals

Some articles on double seals, seals, seal:

End Face Mechanical Seal - Tandem and Double Seals
... Since almost all seals utilize the process liquid or gas to lubricate the seal faces, they are designed to leak ... In these applications a second "containment" seal is placed after the primary seal along the pump shaft ... The space in between these two seals is filled with a neutral or compatible liquid or gas (generally nitrogen) called a buffer seal (unpressurized) or barrier ...

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