ZJVP Series Vacuum Pump System consists of a Roots pump (mechanical booster pump) as the main pump, and a rotary vane vacuum pump or liquid ring vacuum pump as the front stage pump. The unit is mainly used for vacuuming and drying various vacuum systems that require high pumping speed and obtain medium/high vacuum, especially suitable for transformer vacuuming operations. This vacuum drying and pumping unit is widely used in industries such as vacuum smelting, vacuum heat treatment, welding, chemical and pharmaceutical, vacuum coating, electronic components etc.