This series consist of peripheral pumps, so called because the peripheral edge of the impeller contains numerous radial blades, designed to yield energy to the fluid being pumped. The particular shape of the blades rapidly transfers radial re-circulation motion to the fluid on entry to the pump between the impeller blades and the double channel, machined on each side of the pump body. Since each of the numerous blades helps transfer energy, the fluid 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.The relatively simple construction technology embodied in the series nevertheless requires particularly accurate mechanical machining during manufacture to prevent a drop in performance.