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@Screw pump, Rotary pump, positive displacement pump

Screw, shaft,casing,low,pressure line, high pressure line

Rotating screws create a pressure difference and push the liquid

fuel oil system, lubricating oil system ///

@Gearwheel pump, rotary pump, positive displacement pump

gearwheels, teeth, shaft, casing, low pressure line, high pressure line

Rotating gearwheels pressurize and move the medium

fuel oil system, lubricating oil system

@Jet pump, eductor, ejector.... Air driven eductors, steam driven eductors, water drive eductors.

One medium is used to move another medium... Driver line, suction line, venturi valve, diffusor/

@Piston pump, Reciprocating pump, Positive displacement pump.... pistons, cylinders, suction valves, discharge valve.

reciprocating piston pressurizes the liquid, operates suction and discharge valves... bilge systems/

@Centrifugal pump, lmpeller pump, Angular momentum pump...impeller, vanes, shaft, casing,suction in the eye

Rotating impeller transfers energy to the liquid, sucks it in the eye and discharges to the periphery...coling water system, fresh water system, sea water system