US3402734A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Balanced piston relief valve
Assignee: United States Department of the Navy
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Filing: 1966-05-26
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Granted: 1968-09-24
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Expires: 1986-05-26
Abstract
No abstract record available.
Inventors
- 👤 Jr Roland W Robbins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 20:08
CPC Classifications
F; F16; F16K; F16K17/00; F16K17/02; F16K17/04; F16K17/0433; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7758; Y10T137/7762; Y10T137/7764; Y10T137/7766
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
202 words
A PRESSURE RELIEF VALVE FOR HYDRAULIC SYSTEMS, COMPRISING; (A) A VALVE BODY HAVING A BORE THEREIN, TERMINATING AT ONE END THEREOF IN AN INWARDLY TAPERING VALVE SEAT; (B) A CYLINDRICAL POPPET VALVE, HAVING A CENTRAL BORE EXTENDING THERETHROUGH, AND HAVING A FORWARD INWARDLY TAPERING END SURFACE OF A SHAPE TO CONFORM TO SAID VALVE SEAT, SAID POPPET VALVE ALSO HAVING AN ANNULAR FORWARD SURFACE DISPOSED INWARDLY ADJACENT ITS TAPERING END SURFACE AND EXPOSED TO SYSTEM PRESSURE, SAID POPPET VALVE ALSO HAVING A METERING APERTURE EXTENDING BETWEEN ITS OPPOSITE ENDS, PERMITTING APPLICATION OF SYSTEM PRESSURE TO ITS ANNULAR REAR SURFACE; (C) AT LEAST ONE OUTLET PRESSURE RELIEF PASSAGE COMMUNICATING WITH THE BORE OF THE VALVE BODY, BLOCKED BY THE POPPET VALVE, WHEN IN CLOSED POSITION, AND COMMUNICATING WITH SYSTEM PRESSURE WHEN THE POPPET VALVE MOVES A PREDETERMINED DISTANCE AWAY FROM ITS SEAT; (D) A CYLINDRICAL PILOT VALVE SLIDEABLY DISPOSED WITHIN THE BORE THE POPPET VALVE, SAID PILOT VALVE HAVING A CIRCULAR END SURFACE EXPOSED TO SYSTEM PRESSURE, SAID PILOT VALVE HAVING A PORTION DISPOSED REARWARDLY OF THE REAR FACE OF THE POPPET VALVE IN SEALING ENGAGEMENT WITH THE VALVE BODY, AND PROVIDING A CLOSED CHAMBER ADJACENT THE REAR FACE OF THE POPPET VALVE
Claim 2
Dependent Claim
202 words
A PRESSURE RELIEF VALVE FOR HYDRAULIC SYSTEMS, COMPRISING; (A) A VALVE BODY HAVING A BORE THEREIN, TERMINATING AT ONE END THEREOF IN AN INWARDLY TAPERING VALVE SEAT; (B) A CYLINDRICAL POPPET VALVE, HAVING A CENTRAL BORE EXTENDING THERETHROUGH, AND HAVING A FORWARD INWARDLY TAPERING END SURFACE OF A SHAPE TO CONFORM TO SAID VALVE SEAT, SAID POPPET VALVE ALSO HAVING AN ANNULAR FORWARD SURFACE DISPOSED INWARDLY ADJACENT ITS TAPERING END SURFACE AND EXPOSED TO SYSTEM PRESSURE, SAID POPPET VALVE ALSO HAVING A METERING APERTURE EXTENDING BETWEEN ITS OPPOSITE ENDS, PERMITTING APPLICATION OF SYSTEM PRESSURE TO ITS ANNULAR REAR SURFACE; (C) AT LEAST ONE OUTLET PRESSURE RELIEF PASSAGE COMMUNICATING WITH THE BORE OF THE VALVE BODY, BLOCKED BY THE POPPET VALVE, WHEN IN CLOSED POSITION, AND COMMUNICATING WITH SYSTEM PRESSURE WHEN THE POPPET VALVE MOVES A PREDETERMINED DISTANCE AWAY FROM ITS SEAT; (D) A CYLINDRICAL PILOT VALVE SLIDEABLY DISPOSED WITHIN THE BORE THE POPPET VALVE, SAID PILOT VALVE HAVING A CIRCULAR END SURFACE EXPOSED TO SYSTEM PRESSURE, SAID PILOT VALVE HAVING A PORTION DISPOSED REARWARDLY OF THE REAR FACE OF THE POPPET VALVE IN SEALING ENGAGEMENT WITH THE VALVE BODY, AND PROVIDING A CLOSED CHAMBER ADJACENT THE REAR FACE OF THE POPPET VALVE
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-09-24 | 1972-03-25 | 1972-09-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-09-24 | 1976-03-25 | 1976-09-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-09-24 | 1980-03-25 | 1980-09-24 | $7700.00 | Window Closed / Lapsed |