Abstract: The present invention relates to a sealed centrifugal pump used for delivering special liquids and that overcomes the limitations of well-known canned or sealed motor pumps, including relatively short service life of the bearings and unsuitability for delivering liquids or fluids containing tiny particles or contaminents by means of a new type of structure in which the bearings, which are working in liquid phase, are isolated from the pumped fluid medium. This enables ball bearings to be used as the support of the canned motor, the use of lubricating oil and grease for the ball bearings, and the forced cooling of the lubricant and bearings other than by the pumped fluid, so that the service life of the whole pump unit has been increased, and the delivery of liquids containing tiny particles is enabled.