Multistage pumps

Description multistage pump:
Several closed radial centrifugal impellers are put in series on a pump shaft. Each impeller is rotating in a seperate radially splitted casing part/ stage. The stages are connected where the the first stage feeds the next, thus increasing pressure with each stage.The most applied model is the long coupled model, where shaft is supported by ball bearings in a bearing housing, outside the liquid zone. A shaft seal provides for a water and air tight seal in the casing between impeller and bearings.

Applications: 
For general clean water applications, where a reliable pump is needed with minimum maintenance but with high heads.