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x - torr ( x - mbar), while two-stage designs can achieve x - torr ( x - mbar). figure | cross-sectional view of a rotary vane pump (figure courtesy of nigel s. harris m. sc, c. phys., author " modern vacuum practice ", rd revised edition, kurt j. lesker company, ) due to the prevalence of rotary vane
pumps, it is important for designers and users of industrial vacuum equipment to have a good understanding of how these pumps function. this series of articles will cover pump principles of operation, pump designs, pump oils, single-stage versus two-stage pump designs, contamination and gas ballast...
https://vacaero.com/information-resources/vacuum-pump-technology-education-and-training/195875-oil-sealed-rotary-vane-pumps.html