Applications for Dry Screw Vacuum Pumps

Inside the casing of the NES Company Inc. NSP Series dry screw vacuum pump are two screw rotors. These screws are placed next to each other so that there are spaces of tight tolerance between them. The space between them is larger next to the inlet and smaller next to the outlet because of the variable pitch of the screws. As the process gas enters, it is displaced forward by the rotation of the screws and continuously compressed by the decreasing available space. The rapid displacement and compression create the pressure differential by which high vacuum levels can be achieved.