o One connected to the input shaft

o One connected to the input shaft; known as the pump or impellor, primary wheel input turbine
o The other connected to the output shaft, known as the turbine, output turbine, secondary wheel or runner
The driving turbine, known as the pump, is rotated by the prime mover which is typically an internal combustion engine or electric motor. The impellor’s motion imparts both outwards linear and rotational motion to the fluid. If there is a difference between input and output angular velocities the motion has a component which is circular. If the input and output stages have identical angular velocities there is no net centripetal force – and the motion of the fluid is circular and co-axial with the axis of there is no flow of fluid from one turbine to the other.

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