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. – roots, flowers and leaves call us!
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understanding of how claw and screw pumps operate. this includes the principles of operation, pump design, sealing, operating characteristics, features, purging, and ancillary devices. a dry screw pump (fig. ) is used alone when high vacuum is not required and a slower drawdown is allowable, or with a roots
blower (aka booster) when higher performance is required. for the highest system performance, both a roots booster pump and a secondary high-vacuum (e.g., diffusion) pump are utilized with the primary pump, which provides the fastest pumping speed and highest ultimate vacuum. when used in series with...
https://vacaero.com/information-resources/vacuum-pump-technology-education-and-training/191960-dry-pumps-screw-type.html