Air Compressor, Screw Air Compressor, Screw Vacuum Pump manufacturer / supplier in China, offering China Factory Oil-Injected Screw Low Vacuum Vacuum Pump 37kw 45kw 55kw, China Factory 30kw 45HP 1800m³ /Hr (-0.05) - (-0.098) MPa Pressure Permanent Magnet VFD/VSD Screw Air Vacuum Pump for Chemical Industry, China Factory Direct Selling Variable-Frequency Drive Air Cooled Oil Electrical Screw Air Pump for Vacuum Industry and so on.