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x - torr ( x - mbar), while two-stage designs can achieve x - torr ( x - mbar). 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 (manual and automatic), common accessories, applications, troubleshooting and pump maintenance. principles of operation of the various vacuum pump technologies, rotary vane pumps are considered...
https://vacaero.com/information-resources/vacuum-pump-technology-education-and-training