单词 | positive-displacement pump |
释义 | positive-displacement pump [`päz·ǝd·iv dis¦plās·mǝnt ´pǝmp] MECHANICAL ENGINEERING A pump in which a measured quantity of liquid is entrapped in a space, its pressure is raised, and then it is delivered; for example, a reciprocating piston-cylinder or rotary-vane, gear, or lobe mechanism. |
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