External gear pumps The GPs are external cylinder gears pumps, with compensation of axial games. They allow to obtain high volumetric returns even at high operating pressure, low level of noise and characterized by a high duration thanks to the loading of load balancing on driving bushings. The pumps are divided into three dimensional groups, with displacement of up to 9.1 - 27.9 and 87.6 cm3/lap respectively and with operating pressure up to 250 bar, up to 310 bar in the version for high pressure H. are available with an hourly direction of right rotation, left or reversible, with a conical tree with a key, cylindrical with key and groove, single or coupled.