... vacuum-pump of the electrical vacuum device in transformer substation, administration of power supply, power generation plant, and transformer manufactory, and it can vacuum ... pump in vacuum melting, welding, drying, chemical pharmacy. ZJ ... 701503006001200Vacuum Limit(Pa)≤7≤7≤7≤5≤5Operating Vacuum(Pa)≤133 Pumping Stage No.22233Net Weight ...