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Addenda The capabilities comparison of the hydraulic metering pumps with various constructions

Type

Item

Internal
gear pumps with linear conjugate conjunction

External gear pump

Vane pump Axial plunger pump Radial plunger pump Screw pump
Working pressure
(MPa)
≤25 ≤20 ≤21 ≤32 ≤20 ≤10
Displacement
(ml/r)
5.1~500 0.3~650 0.5~480 0.2~3600 20~720 1~9200
Speed
(r/min)
600~5000 300~7000 500~4000 600~6000 700~1800 1000~18000
Volumetric efficiency
 
0.73~0.94 0.70~0.95 0.80~0.95 0.90~0.98 0.85~0.95 0.75~0.95
Overall efficiency 0.69~0.91 0.60~0.85 0.75~0.85 0.85~0.95 0.75~0.92 0.70~0.85
Pulsations of flow Very small Large Medium Medium Medium Very smally
Suction performance Good Good Worse Worse Bad Good
Sensitivity to the contamination of the medium Not sensitive Not sensitive Sensitive Sensitive Sensitive Not sensitive
Noise Very small Large Larger Large Large Vry small
Life Very long Shorter Medium Longer Longer Very long
Price per unit power High The lowest Medium High High Higher