Editing Pump (section)

====Axial-flow pump====
{{Main article|Axial-flow pump}}

These are also referred to as ''all-fluid pumps''. The fluid is pushed outward or inward to move fluid axially.  They operate at much lower pressures and higher flow rates than radial-flow (centrifugal) pumps. Axial-flow pumps cannot be run up to speed without special precaution. If at a low flow rate, the total head rise and high torque associated with this pipe would mean that the starting torque would have to become a function of acceleration for the whole mass of liquid in the pipe system.<ref>{{Cite web|url=http://www.idmeb.org/contents/resource/80030b_15_23.pdf|title=Radial, mixed and axial flow pumps|date=June 2003|website=Institution of Diploma Marine Engineers, Bangladesh|access-date=2017-08-18|archive-date=2014-03-08|archive-url=https://web.archive.org/web/20140308210404/http://www.idmeb.org/contents/resource/80030b_15_23.pdf|url-status=dead}}</ref>

Mixed-flow pumps function as a compromise between radial and axial-flow pumps. The fluid experiences both radial acceleration and lift and exits the impeller somewhere between 0 and 90 degrees from the axial direction.  As a consequence mixed-flow pumps operate at higher pressures than axial-flow pumps while delivering higher discharges than radial-flow pumps. The exit angle of the flow dictates the pressure head-discharge characteristic in relation to radial and mixed-flow.