Dried out screw 
vacuum pumps operate with two screw rotors rotating in opposite Screw Vacuum Pump directions. This traps the medium to become pumped between your cylinder and the screw chambers and transports it to the gas discharge. The advanced screw style results in lower electrical energy consumption in comparison to standard screw designs. In addition, it results in a lower high temperature load of the compressed gas.
Cooling can be achieved through a higher performance air cooling method eliminating the necessity of cooling water or indirect cooling technique leading to uniform temperatures through the entire pump body, eliminating frosty spots and offering a thermally stable water jacket. The advanced screw style permits best-in-class hydrogen pumping features. Water cooling can take place in type of both direct water cooling or radiator cooling with air-cooled high temperature exchangers.