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positive-displacement pump

   Also found in: Medical, Wikipedia, Hutchinson 0.01 sec.
positive-displacement pump [′päz·əd·iv dis¦plās·mənt ‚pəmp]
(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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is a positive-displacement pump for open and closed-mold processes that reportedly delivers [+ or -] 0.
A positive-displacement pump delivers liquid additive to a nozzle, which sprays the additive over the solids as they pass through the cascade chamber just above the extruder throat.
passages will pass a maximum of only 5 to 8 gpm, positive-displacement pumps will lift the relief valve, causing most of the flow to recirculate back to the pump suction.
 
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