The impeller is the most important rotating parts of the pump that imparts the centrifugal acceleration to the fluid. Impellers may be classified in many ways. For example:
- taking in account the direction of flow in reference to the axis of rotation of the shaft:
a ) axial flow,
b ) radial flow
c ) mixed flow
- taking in account suction type
a ) single suction
b ) double suction
- taking in account mechanical construction of vanes
a ) closed vane type
b ) open vane type
c ) semi open type.
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