Single-vane impeller
Single-vane impellers can be classified in radial, open diagonal and closed single-vane impellers.

Fig. 1 Single-vane impeller: Closed single-vane impeller (shown with shroud removed)
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Fig. 2 Single-vane impeller: Open single-vane impeller
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Fig. 3 Single-vane impeller: Open, diagonal single-vane impeller (D impeller)