Palette pumps fixed the DFP pumps and the DFDPs are fixed -displacement palette pumps, made of four different sizes, in turn divided into five nominal sizes of displacement. They are available as a single pump or double pump. The pompante group consists of a cartridge that contains the rotor, the palettes, the State Ring and the head discs. The cartridge is easily removable without the need to disconnect the pump from the hydraulic circuit, thus simplifying maintenance operations. The particular elliptical profile of the State ring, with double suction chambers and opposite delivery, cancels the radial thrusts on the rotor, definitely reducing the wear of the pump. The 12 palette rotor reduces the pressure pulses in the delivery, containing the vibrations and the noise of the pump.