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9/13/2011. 2. TYPES OF PUMPS. POSITIVE DISPLACEMENTHigh pressureLow flowFlow does not change when pressure changesCENTRIFUGALLow pressureHigh flowflow changes when pressure changes. 9/13/2011. 3. TYPES OF PD PUMPS. PistonDiaphragmFlexible diaphragm instead of pistonRelatively inexpensiveHigh degree of accuracy for chemical injection3 types:Mechanically actuatedElectronically actuatedHydraulically actuated.
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