The series ZJP Roots vacuum pump can be used as boosters combined with a backing pump such as a rotary pistona rotary vane vacuum pump.a liquid ring vacuum pump. But they can not be used to exhaust gas directly to atmosphere. The series ZJP Roots pumps are high in ultimate pressure (With a double stage rotary piston pump its backing pump. A roots pump can attain an ultimate pressure of 10-4hpa )Their inherent overflow valve play auto-protective role. Lubrication is unnecessary as there is no contact between rotors,rotorhousing. The robust drive of the pumpoperating parts balanced carefully permit that the pump be stable operated continuously under the condition of high pressure differential. The series ZJP roots pump also have a feature of lower noise. It widely used for vacuum furnace, vacuum coating, vacuum packing, vacuum metallurgical, vacuum drying, aviation aerospace、high vacuum imitation experiment、solar power energy batteryother vacuum work widely used. It widely used for Titanium Sponge Magnesium metal.