Apparatus for closing guide vanes of a hydraulic machine

Details Apparatus for closing guide vanes of a hydraulic machine Apparatus for closing guide vanes of a hydraulic machine

1977-03-25

1978-09-05

Geoghegan, Edgar W.

Motors: expansible chamber type

Working member position responsive motive fluid control

Exhaust control

60325, 60394, 60461, F15B 1522

Patent

active

041111010

ABSTRACT:
An apparatus for closing the guide vanes of a water turbine, for example, by means of a servo-motor controlled by a distributing valve responsive to the variation in the speed of the water turbine. The closing speed of the servo-motor is controlled to vary stepwisely by controlling the flow of the operating oil discharged from the servo-motor by a throttle control valve. The throttle transfer valve is controlled by first and second fluid actuators which are controlled by a first transfer valve operated by the closing operation of the servo-motor, a second transfer valve, and a time delay means.

REFERENCES:
patent: 1103891 (1914-07-01), Pfau
patent: 2157707 (1939-05-01), Keel
patent: 2500797 (1950-03-01), Bullard

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