Working with Turbopumps

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the fore-vacuum pressure, is the pressure on the fore-vacuum side of the turbo-pump. A turbopump cannot expel against atmosphere and requires, therefore, a vacuum on the exhaust side (the fore-vacuum) which, depending on type, must be between 0.01 and 20 mbar. Diaphragm pumps, oil-sealed rotary vane pumps, Roots pumps or other dry backing pumps

  Pumps, Evans, Vacuum, Rotary, Rotary vane pumps