These medium head range turbines (range of application 5 to 300 m) are supplied as open flume turbines with lower heads and as horizontal and vertical spiral turbines with medium heads. The water flow is radial against the runner and flows off axial via the draft tube.
Spiral turbines are mostly built as compact turbines. The runner is directly fitted to the generator shaft. The size of the machine hall is so reduced to a minimum. With this 2-bearings arrangement we avoid wearing parts like coupling and minimize the running cost.