Page "Cross-flow turbine" Paragraph 9
from
Wikipedia
The regulating device controls the flow based on the power needed, and the available water.
The ratio is that ( 0 – 100 %) of the water is admitted to 0-100 %× 30 / 4 blades.
Water admission to the two nozzles is throttled by two shaped guide vanes.
These divide and direct the flow so that the water enters the runner smoothly for any width of opening.
The guide vanes should seal to the edges of the turbine casing so that when the water is low, they can shut off the water supply.
The guide vanes therefore act as the valves between the penstock and turbine.
Both guide vanes can be set by control levers, to which an automatic or manual control may be connected.
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