
Centrifugal pump design and construction 29
With just one vane more than the impeller, it insures that one impeller passage does not
extend over several diffuser passages.
2.2.5 Diagonal diffuser vanes
Diagonal diffuser vanes are recuperators for the mixed-flow impeller pumps.
The functions of the diagonal diffuser vanes are:
• To change the direction of flow of the liquid leaving the impeller and direct it
along the axis of the pump
• To reduce the velocity of liquid and convert it to pressure.
The vanes are disposed in the axial direction forming channels with no sudden changes
in cross-section. They make it possible to use impellers of ...