Hydraulic servo system for steam turbines

Details Hydraulic servo system for steam turbines Hydraulic servo system for steam turbines

1974-03-21

1976-04-06

Rosenthal, Arnold

Valves and valve actuation

Fluid actuated or retarded

Pilot or servo type motor

415 17, F16K 3112

Patent

active

039484785

ABSTRACT:
A hydraulic servo system for steam turbines providing rapid closing of the main valve between the turbine and the boiler to stop the operation by opening a drainage valve whereby hydraulic fluid is drained immediately from the servo motor which normally maintains the main valve in open position. Secondary valve means are actuated by the resultant pressure drop to drain hydraulic fluid from a portion of the servo system, which is throttled from the servo motor portion, after a predetermined time lapse, and to block off supply of hydraulic fluid to the system. The main valve may be reopened by closing the drainage valve and by actuating the secondary valve means to reconnect the hydraulic fluid source to the throttled portion of the system whereby pressure therein is rapidly restored to a degree sufficient to supply fluid to the servo motor.

REFERENCES:
patent: 3794292 (1974-02-01), Jaegtnes

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