Video Explains Operating Principle of Kalsi-brand Rotary Shaft Seals


This video explains the operating principle of a Kalsi-brand rotary shaft seal.

Kalsi Seals are installed in a circular housing groove. Installation of the shaft compresses the seal radially, producing seal-to-shaft interference. The resulting interfacial contact pressure between the seal and the shaft produces static sealing in the same manner as a radially compressed O-ring.

Kalsi Seals are used to retain lubricant, and the dynamic lip incorporates a wavy lubricant-side edge that is configured to lubricate the seal-to-shaft interface during rotation. The dynamic lip also includes an abrupt circular environment side corner that is configured for excluding environmental contaminants.

During rotation, the shaft drags a thin film of lubricant past the wavy edge and into the seal-to-shaft interface, causing the seal to hydroplane. This hydroplaning action prevents the direct contact, dry rubbing wear, and high friction associated with conventional non-hydrodynamic seals.

When shaft rotation stops, the hydroplaning action stops, and static sealing is reestablished by the initial interference. For available styles and sizes, see our shaft seal catalog. For additional information about our rotary shaft seal product line, contact our staff.