1. Product name:vacuum pump 2. Delivery:10days 3. Phase:3 4. Certificate: CE ... special cultivation, paper cutter,screen printer,injection molding machine,vacuum packaging,delivery of paper,fluid delivery, dry washing of ... etc.Working Principal:Vane wheel is roatted in the pump chamber by principle is side channel, with air inhaled ... vane wheel and finally discharged through exhaust groove. vacuum pump