... vacuum drying machine 2. two stage vacuum pumps ( one rotary vacuum pump + one roots vacuum pump) 3. high efficiency Use:This unit is used to vacuum ... generation plant, and transformer manufactory, and it can vacuum pump in vacuum melting, welding, drying, chemical pharmacy. ZJ operates ... S)701503006001200Vacuum Limit(Pa)≤7≤7≤7≤5≤5Operating Vacuum(Pa)≤133 Pumping Stage No.22233Net Weight (kg) ...