Non-return valve in the suction mouth. Cooling by air and oil. Bearings at both ends of the rotor. Gas ballast valve incorporated.  Available in fine vacuum (0.5 to 100 mbar (abs.) )  or poor vacuum (10-500 mbar (abs.) ).

Protecting housing, silencer and temperature insulation. Oil filters separators, easy access and quick handling. Built-in gas ballast valve, built-in check valve in the suction nozzle. Cooling by air and oil. Above 150 m³/h models; / h incorporate mesh radiator intake.

Pumps for oil loss with condensation tank. Air cooling. Reduced working temperature. Watertight seal to protect the shaft bearings from aggressive products.