... the pump cavity. ISO9001:2000, ISO14001:2004, CE. Vacuum PumpImpeller of the Vacuum Pump is made of excellent alloy copper,air inlet equipped with infiltration valve if required. The Vacuum Pump ... , Plastic Industry, Vacuum Pump's Merits:simple structure, small volume, high-speed extract speed, high vacuum capacity, energy-saving, can work for a longtime without ...