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Effective forces in a Mechanical Seal

These are the forces operating in mechanical seals:

Axial and radial forces

Closing and opening forces

Hydrostatic and hydrodynamic forces

Leakage of a liquid lubricated mechanical seal

Key point: leakage rate Q strongly depends on the gap height h

• The gap height is determinate by several factors: materials, manufacturing quality, lubrication regime, face distortions.
• The leak rate of a contacting seal is also influenced by other pump related factors such as run outs and vibration levels.