Kaplan turbine

Claim 1

IN A KAPLAN TYPE TURBINE HAVING RUNNER BLADES WHICH TEND TO MOVE TO OPEN POSITION IN RESPONSE TO HYDRODYNAMIC FORCES THEREON AND INCLUDING ADJUSTABLE WICKET GATES AND WICKET GATE OPERATING MECHANISM FOR CHANGING THE SETTING OF THE WICKET GATES TO CONTROL THE FLOW OF WATER TO TURBINE RUNNER BLADES, A ROTATING ASSEMBLY INCLUDING A ROTATABLE SHAFT, A CASING RIGIDLY SECURED TO SAID SHAFT, A LIQUID RESERVOIR DISPOSED WITHIN SAID CASING, RUNNER BLADES JOURNALLED IN SAID CASING FOR ROTATION ABOUT AXES RADIAL TO THE CASING, AND MEANS FOR SHIFTING THE POSITION OF SAID RUNNER BLADES IN RESPONSE TO CHANGE IN THE POSITION OF SAID WICKET GATES, SAID MEANS BEING DISPOSED IN SAID CASING AND COMPRISING A PUMP AND HYDRAULIC SERVO MOTOR MEANS INCLUDING A PISTON AND CYLINDER ASSEMBLY, MEANS CONECTING SAID PISTON WITH SAID RUNNER BLADES, CONTROL VALVE MEANS FOR CONNECTING ONE SIDE ONLY OF SAID PISTON SELECTIVELY WITH THE RESERVOIR AND THE OUTPUT OF SAID PUMP, THE OTHER SIDE OF SAID PISTON BEING VENTED TO ATMOSPHERE, SAID SERVO MOTOR DRIVING SAID RUNNER BLADES TO CLOSED POSITION WHEN SAID CONTROL VALVE MEANS CONNECTS THE ONE SIDE OF SAID PISTON WITH THE OUTPUT OF SAID PUMP AND HYDRODYNAMIC FORCE MOVING SAID RUNNER BLADES TO OPEN POSITION WHEN SAID CONTROL VALVE MEANS CONNECTS THE ONE SIDE OF SADE PISTON WITH THE RESERVOIR.