The system consists of a relatively small-capacity dry screw vacuum pump as the backing pump and a large-capacity Roots-type mechanical booster connected in series on the suction side. This configuration is ideal for applications where a standalone dry screw pump (2.5–13 m³/min) cannot provide sufficient pumping capacity or when a higher vacuum level than that achievable by the dry pump alone is required. By directly coupling the mechanical booster to the inlet side of the dry screw pump, the system delivers stable and efficient operation over a suction pressure range of approximately 30 Torr to 5 × 10⁻³ Torr. Compared with operating a larger standalone vacuum pump, this arrangement offers lower operating costs while improving process stability.
With pumping capacities ranging from 600 to 20,000 m³/h, the system can accommodate a wide variety of industrial applications while maintaining a consistent vacuum level throughout operation. In addition, as a completely oil-free and water-free vacuum solution, the system generates no waste oil or wastewater, eliminating disposal costs and minimizing environmental impact.