| abstract |
Screw vacuum pump with a pump chamber forming housing (26), wherein the housing (26) is made of aluminum or an aluminum alloy, two screw rotors arranged in the pump chamber (46), each having at least one displacement element (10, 12) having a helical recess for forming a plurality of coils, the at least one displacement element (10, 12) being made of aluminum or an aluminum alloy, characterized in that between the region in which 5% to 20% of the outlet pressure prevail and a pressure-side rotor end (pump outlet) at least six, in particular at least eight, and particularly preferably at least ten turns are provided. |