These impulse turbines for the high head range (relatively small discharge with heads of more than 30 m) are manufactured by Geppert with 1 to 6 nozzles. The jet units are offered external and internal controlled.
Units with 1 and 2 nozzles are built in horizontal design and units with 1 to 6 nozzles are built in vertical design. All jets are individually controlled in order to achieve the optimized efficiency. Drinking water turbines are built drinking water safe.
With external regulated nozzles the nozzles are offered with scavenging stroke. In such an operation, the nozzles are briefly retreated behind the leadfish and so during operation deposits offloating debris(egleaves) are dissolved and rinsed.