US3669562A
Expired / Lapsed
US
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Extraction turbine with a servo actuated balanced grid valve for extraction control
Assignee: Westinghouse Electric Corp
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Filing: 1971-01-12
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Granted: 1972-06-13
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Expires: 1991-01-12
Abstract
Abstract IN AN EXTRACTION TURBINE PROVIDED WITH A GID VALVE HAVING A STATIONARY PORT RING AND A ROTATABLE PORT RING ACTUATED BY A SERVOMOTOR FOR CONTROLLING THE FLOW OF A HIGHLY PRESSURIZED ELASTIC FLUID, SUCH AS STEAM, PRESSURE FORCES ON THE CONTACTING INTERFACES OF THE TWO RINGS ARE MINIMIZED BY PROVIDING AN ANNULAR BALANCING MEMBER SECURED DIRECTLY TO THE ROTATABLE RING AND ACTED UPON BY THE HIGH PRESSURE ELASTIC FLUID IN A MANNER TO SUBSTANTIALLY BALANCE THE PRESSURE FORCES ON THE ROTATABLE RING, THEREBY ENABLING THE GRID VALVE TO BE UTILIZED IN HIGHER PRESSURE SYSTEM WITHOUT INCREASING THE EFFORT REQUIRED TO OPERATE THE VALVE.
Inventors
- 👤 John M Mcnally
- 👤 Albert H Molette Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 13:07
CPC Classifications
F; F01; F01K; F01K7/00; F01K7/34; F01D; F01D17/00; F01D17/10; F01D17/12; F01D17/14; F01D17/141; F01K7/345
Claims Analysis
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References Cited (Backward Citations)
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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 |