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designers and users of vacuum furnaces must have a good 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
high-vacuum pump, the primary pump is referred to as a "backing" pump. figure | typical dry screw pump (courtesy of edwards vacuum) principle of operation of the various vacuum pump technologies, screw pumps are considered dry, positive displacement pumps. dry, because the gas being transferred is not...
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