positive-displacement pump


Also found in: Dictionary, Thesaurus, Medical.

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.
References in periodicals archive ?
There are many manufacturers but there are two main classes of positive-displacement pump: piston pumps and piston-diaphragm pumps.
The Patriot from Magnum Venus Products, Clearwater, Fla., is a positive-displacement pump for open and closed-mold processes that reportedly delivers [+ or -] 0.1% ratio control and [+ or -] 1% or better resin flow control.
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.
Progressive-cavity, positive-displacement pump produces accurate and constant flow of liquids with only one moving part.
Twin screws are typically fully intermeshing and can act like a positive-displacement pump for sticky materials or like a valve to stem flooding of aerated materials.

Full browser ?