This type of pump is a spool - type mechanical vacuum pump, and it is one of the vacuum equipment for extracting general gases or a small amount of condensable gases (a gas ballast device should be used).
The geometric pumping speed of this type of pump is 50 liters per second, and the ultimate pressure is 1 pascal. It is suitable for vacuum smelting, vacuum drying, vacuum impregnation, and other operations. It can be used alone or as a fore - pump for other high - 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.
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