Three-screw pumps of FAC, FAD, FAG, FAH, FACV and FADV. Series are intended for clean viscous liquids forced pumping. Their main application may be found in high-pressure hydraulic oil systems of all kinds, e.g. with presses, machine-tools and forming and/or shearing machines, lifts and further lifting gears, boiler house auxilliary systems, turbine governors, turbo-compressors, paper and/or printing machines, etc. Those pumps are also available for hydraulic drives, provided that there only unidirectional rotary motion is required. They are intended for delivering standard sorts of lubricating and/or engine oils and even viscous stuffs having lubricating capacity but without mechanical impurities and corrosive effects, neither congealing nor crystalizing. Max. temperature of a pumped liquid 180 °C, kinematic viscosity of a pumped liquid ranging from 2.5 to 1,500 mm^2/s.