The main working parts of the centrifugal pump impeller, the impeller has a certain number of leaves (usually 6 to 12). Centrifugal pump blades are curved backward, the impeller is fixed on the spindle, driven by the spindle rotation, the mechanical energy transmitted to the water, the first in the impeller to obtain kinetic energy. Outside the impeller is a helical pressure chamber, commonly referred to as a volute, which acts to collect water thrown from the impeller on the one hand, and to convert some of the kinetic energy to pressure energy on the other hand to the outlet pipe. Impeller is the heart of the vane pump and is the most important pump working element. Impeller by the cover and the middle of the leaves.