CONTROL DEVICE FOR HYDRAULIC TURBINE RUNNER BLADES Russian patent published in 1998 - IPC

FIELD: Kaplan turbines with electrohydraulic speed governor. SUBSTANCE: device has electrohydraulic converter, main control valve, servomotor electrically connected to converter, shut-off valve installed in water channel between main control valve and servomotor, mode selecting valve, manual control valve whose control lines are connected to water channel between shutoff valve and servomotor, and servomotor position indicator. Three-position shut-off valve has two end control cavities and additional ports. At least one of these ports joins shut-off valve in one of its positions corresponding to emergency condition to drain line to make it communicate with servomotor interior. Mode selecting valve is also three-position device joined through one of its control lines corresponding to emergency condition with one of end control cavities of shut-off valve. During emergency situations involving sudden pressure rise in servomotor closing cavity, bursts are eliminated in servomotor-to-piping joints by means of device. EFFECT: reduced space requirement, improved reliability of device. 5 cl, 1 dwg