MULTI-STAGE VACUUM PUMP OF THE DRY PUMP TYPE
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United States of America Patent
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Issued Date -
Jul 24, 2014
app pub date -
Jan 14, 2014
filing date -
Jan 18, 2013
priority date (Note) -
Abandoned
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Abstract
A multi-stage vacuum pump of the dry pump type is disclosed. The multi-stage vacuum pump includes a plurality of pumping stages each respectively having an inlet and an outlet, the pumping stages being mounted in series between a suction port and a discharge port of the vacuum pump, characterized in that the vacuum pump also includes at least one valve configured to dump pressure from a pumping stage, said valve being arranged in the upper part of the vacuum pump, on the same side as the inlet of the pumping stage.
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