The DFP and the DFDP are fixed displacement vane pumps made in four different sizes, each with five nominal displacements sizes. They are available with a single pumping element, or with a double pumping element.

The pumping unit consists of a compact cartridge element that contains the rotor, vanes, the strator ring and the head disks. The cartridge is easily removable without the need to disconnect the hydraulic circuit pump, thus simplifying maintenance operation. The particolar elliptical profile of the stator ring with double opposing suction and delivery chambers, cancels the radial thrusts on the rotor, significantly reducing pump wear. Furthermore, the use of a 12 vane rotor reduces the pulsations of the delivery pressure, limiting the vibrations and noise of the pump.