high vacuum 10-7 ÷ 10-3 hPa medium vacuum 10-3÷ 1 hPa rough vacuum 1 ÷ 1000 hPa overpressure 0 ÷ 0,1 MPa Oil-free compressors A range       _______  Oil-free pumps A...P range         ___________   Rotary vane oil sealed pumps AT / A range     _____________   Rotary vane oil sealed pumps AL, AW range   ___ ___ _ _ _ _ _ _   Rotary vane oil sealed pumps BL,BW,BWC range   ____________ _ _ _ _ _ _ _ _ _   Roots pumps PR range   ____________ __   Diffusion pumps PDO range ____________       __________ solid line denotes continous operation without any limits _ _ _ _ _ _ _ doted line denotes intermittent operation limited to a few minutes

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