According to the size of the pumping system, working pressure and other factors, the vacuum unit can be reasonably configured.
The ratio (pumping speed ratio) between the pumps of the vacuum unit can be selected from 1:2 to 1:8.
The gas efficiency is reduced, the working pressure range is reduced, the start-up is slow, and the fore sucking time is prolonged.

Specialties
1	The Roots screw vacuum pump unit is an oil-free vacuum pump unit consisting of a ZJB Roots pump as the main pump and an intermediate pump with a FDPH screw vacuum pump as the front stage pump.
2	The roots vacuum pump and the screw vacuum pump have the advantages of the screw vacuum pump. At the same time, the Roots vacuum pump in series is used to multiply the pumping speed of the screw vacuum pump to increase the ultimate vacuum and make the pumping system better. energy saving effect.
3	The Roots screw unit has a high vacuum and high pumping efficiency in the high vacuum area.
4	Through the supporting control system, the unit realizes automatic start and stop, and has automatic protection functions such as overload, over current and water cut.
5	Through the supporting control system, the unit realizes automatic start and stop, and has automatic protection functions such as overload, over current and water cut.
6	The entire vacuum unit can be preservative treated so that it can be used to remove corrosive gases.
7	Each vacuum pump of the unit adopts vertical stacking or stepped structure. The unit has a small footprint, and each pump and intermediate pipeline are not easy to accumulate foreign matter. It has obvious advantages in removing gas containing a small amount of condensable gas or a small amount of dust.

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