Gene Vogel 
EASA Pump and Vibration Specialist 

For most centrifugal pumps, the shaft has packing or a mechanical seal where the shaft enters the wet end. Fundamentally, a sealless pump sub­stitutes a magnetic drive for the shaft seal. The impeller shaft is fitted with a magnetic rotor which is contained in a thin metal cover. The shaft, impel­ler, the rotor and the bearings are all “wet” components; that is, they are completely submersed in whatever liquid is being pumped. Over the out­side of the magnetic rotor and cover is a magnetic drum which is driven by the power source, usually an elec­tric motor. The magnetic coupling between the rotor and drum delivers torque to the shaft and impeller. 

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