Oil Free Vacuum Pump, Screw Vacuum Pump, Dry Vacuum Pump manufacturer / supplier in China, offering Low Noise Screw Vacuum Pump LG-90 90m³ /H 1.1kw Air-Cooled Dynamic Balance ≤ 70dB, Pollution-Free Screw Pump for Oil & Gas Recovery Auto-Drain Limit Vacuum ≤ 5PA Eco-Certified, High-End Screw Pump Bearings Grade-5 Gears Optional Explosion-Proof Motor and so on.