This series pumps are with peripheral impeller containng numerous radial?bladial in its edge.Self-priming because the particular design of the pump body ensures the elimination of any air in the suction piping.The re-circulation of the pumped fluid induced by the particular shape of the pump body permits the self-priming effect,extracting and completely expelling any air in the suction piping.The fuid pressure increases progressively as it passes from the suction opening to the delivery opening,ensuring an even,non-pulsing flow and high pressures with particularly steep curves.