Profile: Ningbo Southern Imp. & Exp. Co., Ltd. is a manufacturer of metal bellows & vacuum parts, rubber molds & thermosetting plastic molds, and vibrating machines. Our VS series of oil rotary vacuum pump utilizes a single-stage design in the pumping system. It is coupled with a direct-drive motor. It is used in evaporation, sputtering, ion plating, gas substitution, back-filling, and vacuum heat insulation processes.