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* Please start editing this page after the /noinclude | * Please start editing this page after the /noinclude | ||
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[[Image:Lysholm_screw_rotors.jpg|thumb|upright|Screw pump]] | [[Image:Lysholm_screw_rotors.jpg|thumb|upright|Screw pump]] | ||
A '''pump''' displaces a volume by physical or mechanical action. Pumps fall into three major groups: direct lift, displacement, and gravity pumps. | A '''pump''' displaces a volume by physical or mechanical action. Pumps fall into three major groups: direct lift, displacement, and gravity pumps. |