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Pfeiffer <strong>Vacuum</strong><br />
Page 4<br />
<strong>Vacuum</strong> <strong>Technology</strong><br />
<strong>Vacuum</strong> <strong>Technology</strong><br />
Page<br />
2 <strong>Vacuum</strong> Generation 26<br />
2.1 Pump principles and vacuum pump performance data 26<br />
2.1.1 Classification of vacuum pumps 26<br />
2.1.2 Pumping speed and throughput 26<br />
2.1.3 Ultimate pressure and base pressure 27<br />
2.1.4 Compression ratio 27<br />
2.1.5 Pumping speed of pumping stages connected in series 27<br />
2.1.6 Gas ballast 28<br />
2.1.7 Water vapor tolerance / water vapor capacity 28<br />
2.1.8 Sealing gas 29<br />
2.2 Rotary vane vacuum pumps 29<br />
2.2.1 Design / Operating principle 30<br />
2.2.2 Application notes 30<br />
2.2.3 Portfolio overview 31<br />
2.2.3.1 Single-stage rotary vane vacuum pumps 32<br />
2.2.3.2 Two-stage rotary vane vacuum pumps 33<br />
2.2.3.3 Operating fluid selection 34<br />
2.2.3.4 Accessories 35<br />
2.3 Diaphragm vacuum pumps 38<br />
2.3.1 Design / Operating principle 38<br />
2.3.2 Application notes 38<br />
2.3.3 Portfolio overview 39<br />
2.4 Piston vacuum pumps 40<br />
2.4.1 Design / Operating principle 40<br />
2.4.2 Applications 41<br />
2.4.3 Portfolio overview 41<br />
2.5 Screw vacuum pumps 41<br />
2.5.1 Design / Operating principle 41<br />
2.5.2 Application notes 43<br />
2.5.3 Portfolio overview 44<br />
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