Transmission of power through hydro kinetic energy in the stream of oil / water between the Impeller & Runner ot the coupling. Fixed quantity of oil is used in the working circuit and delivers fixed speed on the output side. Range : For power up to 1500 kW Sizes : From 8" to 41" circuit diameter Type :FCU / FP / DFC / DFP / PSS / HTC / AFC / SFC / SDFC / WDFC / SFU / STC