VDP Series adopts patented three-stage variable pitch rotor profile, which saves 30% of power, has low exhaust temperature rise, high vacuum degree and stable process. It is widely used in vacuum drying, vacuum concentration, vacuum distillation, solvent recovery and other processes in the pharmaceutical, chemical, food and electronic semiconductor industries; vacuum extrusion and vacuum forming in the plastic and tire industries; vacuum degassing in the steel and metallurgical industries; centralized vacuum system in the semiconductor and electronic industries, etc. It has incomparable advantages due to its high vacuum cleanliness, no water, no oil, low noise, safe and reliable performance, high stability, small footprint, high corrosion resistance and other characteristics of the coating.