Control system for steam turbines
Abstract
Abstract A STEAM TURBINE CONTROL SYSTEM INCLUDING A VALVE MEANS FOR REGULATING THE FLOWRATE OF STEAM SUPPLIED TO THE TURBINE IN RESPONSE TO AN ELECTRIC SIGNAL IS FEATURED BY THE COMBINATION OF A SERVO-MOTOR FOR DRIVING THE VALVE MEANS UPON RECEPTION OF COMPARATIVELY HIGH PRESSURE OIL AS ITS OPERATIVE FLUID, A SERVO-VALVE FOR DISTRIBUTING THE OPERATIVE FLUID TO THE SERVO-MOTOR IN ACCORDANCE WITH THE ABOVE MENTIONED ELECTRIC CONTROL SIGNAL, A BY-PASS VALVE INSERTED IN THE FLUID PATH FROM THE SERVO-VALVE TO THE SERVO-MOTOR FOR THE PURPOSE OF OPERATING THE VALVE MEANS IN THE CLOSING DIRECTION IN RESPONSE TO A TRIP SIGNAL WHICH SUPERSEDES THE ELECTRIC CONTROL SIGNAL AT AN EMERGENCY, REGARDLESS OF THE DISTRIBUTION OF THE OPERATIVE FLUID FROM THE SERVO-VALVE, AND A DUMP-VALVE DRIVEN BY A COMPERATIVELY LOW PRESSURE OPERATIVE FLUID FOR DRIVING THE BY-PASS VALVE IN RESPONSE TO THE ABOVE MENTIONED TRIP SIGNAL.
Inventors
- 👤 Tetsuzo Sakamoto
- 👤 Akiomi Torii
Bibliographic Details
Claims Analysis
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-06-13 | 1975-12-13 | 1976-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-13 | 1979-12-13 | 1980-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-13 | 1983-12-13 | 1984-06-13 | $7700.00 | Window Closed / Lapsed |