US3131718A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pressure relief valve
Assignee: Robertshaw Controls Co
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Filing: 1960-09-14
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Granted: 1964-05-05
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Expires: 1980-09-14
Abstract
No abstract record available.
Inventors
- 👤 Frank V Mingrone
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:11
CPC Classifications
F; F16; F16K; F16K17/00; F16K17/02; F16K15/00; F16K15/02; F16K15/06; F16K15/063; F16K15/065; F16K17/04; F16K17/0466; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7837; Y10T137/7838; Y10T137/7839; Y10T137/7866; Y10T137/7867; Y10T137/7868; Y10T137/7904; Y10T137/7922; Y10T137/7929; Y10T137/7931; Y10T137/7932; Y10T137/7933
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
195 words
A PRESSURE RELIEF VALVE COMPRISING A VALVE SEAT MEMBER HAVING A PASSAGE THERETHROUGH FOR FLUID FLOW, AN ANNULAR GROOVE IN THE WALL OF SAID PASSAGE, APERTURES IN SAID GROOVE COMMUNICATING WITH THE DOWNSTREAM SIDE OF SAID VALVE SEAT MEMBER, A RESILIENT SEAL IN SAID GROOVE HAVING AN INNER DIAMETER LESS THAN THE DIAMETER OF SAID PASSAGE AND A CROSS-SECTIONAL AREA LESS THAN THE CROSS-SECTIONAL AREA OF SAID GROOVE, A VALVE HAVING A CYLINDRICAL PORTION SLIDABLE IN SAID PASSAGE AND OF A DIAMETER GREATER THAN THE INNER DIAMETER OF SAID SEAL AND A FLANGE ENGAGEABLE WITH THE DOWNSTREAM SIDE OF SAID VALVE SEAT MEMBER AND OF A DIAMETER SUFFICIENT TO CLOSE SAID APERATURES, MEANS BIASING SAID VALVE TO A CLOSED POSITION IN WHICH THE CYLINDRICAL PORTION ENCLOSES THE GROOVE AND COMPRESSES THE SEAL INTO SAID GROOVE AND THE FLANGE CLOSES SAID APERTURES, SAID VALVE BEING MOVABLE TO AN INITIAL POSITION IN RESPONSE TO A PREDETERMINED INCREASE IN UPSTREAM PRESSURE IN WHICH THE EDGE OF SAID CYLINDRICAL PORTION ENGAGES SAID SEAL AND SAID GROOVE IS EXPOSED TO UPSTREAM PRESSURE PERMITTING FLOW THROUGH SAID APERTURES ONLY, AND MOVABLE UPON FURTHER INCREASES IN UPSTREAM PRESSURE TO OPEN SAID PASSAGE.
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) | 1967-05-05 | 1967-11-04 | 1968-05-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-05-05 | 1971-11-04 | 1972-05-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-05-05 | 1975-11-04 | 1976-05-05 | $7700.00 | Window Closed / Lapsed |