Patent US3606980A successfully refreshed from Google Patents.
US3606980A
Expired / Lapsed
US
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Modified butterfly trip valve
Assignee: Westinghouse Canada Inc
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Filing: 1969-12-01
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Granted: 1971-09-21
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Expires: 1989-12-01
Abstract
Abstract THE INVENTION IS A BUTTERFLY VALVE FOR USE IN TURBINE EMERGENCY SHUTDOWN. CONVENTIONAL BUTTERFLY VALVES WOULD JAM AT THE TEMPERATURES AND PRESSURES INVOLVED. THIS VALVE IS ARRANGED TO REMAIN PARTIALLY OPEN IN THE SHUT-OFF POSITION, THE VALVE DISC IS SLIDABLE ON THE VALVE SHAFT TO PREVENT GALLING WITH THE VALVE PASSAGE AND THE DISC IS RELIVED ADJACENT THE SHAFT BUSHINGS. THESE FEATURES, COMBINED WITH AND ANTI-THRUST BEARING FOR THE SHAFT ENSURE RELIABLE OPERATION.
Inventors
- 👤 James Simpson
- 👤 Wesley F Reeder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:08
CPC Classifications
F; F16; F16K; F16K1/00; F16K1/16; F16K1/18; F16K1/22; F16K1/221
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-09-20 | 1975-03-22 | 1975-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-20 | 1979-03-22 | 1979-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-20 | 1983-03-22 | 1983-09-21 | $7700.00 | Window Closed / Lapsed |