What Is a Mechanical Seal?
A mechanical seal is a device used to seal rotating shafts in pumps, mixers, and compressors. It consists of two precision-lapped flat faces -- one rotating with the shaft, one stationary in the housing -- with a thin lubricating fluid film between them that prevents bulk leakage while minimizing friction.
Applications
Centrifugal pumps, chemical reactors, water treatment, and any rotating equipment handling liquids. Available from SMS Bearings through our Sealing Solutions product range.
Frequently Asked Questions
How does a mechanical seal differ from a packing gland?
Packing glands use braided material compressed around the shaft, requiring deliberate leakage for cooling. Mechanical seals use precision-lapped flat faces (one rotating, one stationary) with a thin fluid film between them, achieving near-zero leakage, less shaft wear, and lower friction.