Dry screw vacuum pumps operate with two screw rotors rotating in reverse directions. This traps the medium to end up being pumped between the cylinder and the screw Screw Vacuum Pump chambers and transports it to the gas discharge. The advanced screw design results in lower electrical energy consumption compared to standard screw designs. It also results in a lower high temperature load of the compressed gas.
Cooling may be 
accomplished through a high performance air cooling method eliminating the necessity of cooling water or indirect cooling technique resulting in uniform temperatures through the entire pump body, eliminating cold spots and providing a thermally stable water coat. The advanced screw style allows for best-in-class hydrogen pumping capabilities. Water cooling may take place in form of both direct water cooling or radiator cooling with air-cooled temperature exchangers.