This type of pump is a spool - type mechanical vacuum pump, and it is one of the vacuum pumping equipment for extracting general gases or gases containing a small amount of condensable vapor (a gas ballast device should be used). The performance specifications of this type of pump: the volumetric flow rate is 150L/s, and the ultimate pressure is 1Pa. It is suitable for vacuum smelting, vacuum drying, vacuum coating, vacuum impregnation, and other vacuum operations. It can be used alone or as a fore - pump for other vacuum pumps, but it is not suitable for pumping from one container to another as a transfer pump. When extracting gases that are high in oxygen content, explosive, corrosive to ferrous metals, reactive with vacuum oil, wet, or dusty, additional equipment should be installed.