US3742968A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Differential pressure relief valve
Assignee: United States Department of the Navy
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Filing: 1971-03-22
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Granted: 1973-07-03
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Expires: 1991-03-22
Abstract
Abstract A differential pressure relief valve wherein a diaphragm piercing device is actuated by differential pressure through a bellows. The device is self-contained and is installed in the bulkhead of a sealed container. As the pressure inside the container becomes greater than the pressure outside, the bellows compresses to a fixed compressed height of the bellows, and a spring loaded hollow plunger is released and is driven through a diaphragm on the bellows end, thus venting the container to the outside atmosphere. In one embodiment the bellows and spring biased plunger are interlocked so that the diaphragm is moved against the combined resistance of the bellows and spring. In another embodiment the bellows is compressed independently of the spring.
Inventors
- 👤 R Kennedy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 03:39
CPC Classifications
F; F16; F16K; F16K17/00; F16K17/02; F16K17/14; Y; Y10; Y10T; Y10T137/00; Y10T137/1624; Y10T137/1632; Y10T137/1692; Y10T137/1759; Y10T137/1767
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
155 words
A differential pressure relief valve for a receptacle having an external ambient air pressure greater than the internal air pressure comprising in combination: a. a vented casing body positioned in said receptacle, said vented casing body providing an air path to the ambient external air; b. a compressing means positioned in said vented casing body and responsive to a differential of said ambient-internal pressure for movement within said body; c. a rupturable diaphragm positioned in said vented casing body and located within and operatively coupled to said compressing means for movement therewith; said diaphragm closing said air path; d. a diaphragm piercing means positioned in said vented casing body and including means biasing said piercing means towards said diaphragm; and e. retaining means holding said piercing means in a retracted position and responsive to movement of said compressing means upon a predetermined pressure differential being present to rlease said piercing means for rupturing said diaphragm.
Claim 2
Dependent Claim
155 words
A differential pressure relief valve for a receptacle having an external ambient air pressure greater than the internal air pressure comprising in combination: a. a vented casing body positioned in said receptacle, said vented casing body providing an air path to the ambient external air; b. a compressing means positioned in said vented casing body and responsive to a differential of said ambient-internal pressure for movement within said body; c. a rupturable diaphragm positioned in said vented casing body and located within and operatively coupled to said compressing means for movement therewith; said diaphragm closing said air path; d. a diaphragm piercing means positioned in said vented casing body and including means biasing said piercing means towards said diaphragm; and e. retaining means holding said piercing means in a retracted position and responsive to movement of said compressing means upon a predetermined pressure differential being present to rlease said piercing means for rupturing said diaphragm.
Claim 3
Dependent Claim
58 words
The device recited in claim 1 wherein said vented casing body comprises a first chamber, second chamber, and ventng ports wherein said compressing means is positioned in said first chamber and said piercing means is positioned in said second chamber, said diaphragm being operatively positioned within said compressing means whereby said diaphragm moves while said compressing means compresses.
Claim 4
Dependent Claim
37 words
The device recited in claim 2 wherein said compressing means is operatively connected to said piercing means whereby movement of said diaphragm is resisted by the combined actuating force at said compressing means and said piercing means.
Claim 5
Dependent Claim
21 words
The device recited in claim 3 wherein said compressing means is a bellows and is operatively connected to said piercing means.
Claim 6
Dependent Claim
21 words
The device recited in claim 4 wherein said piercing means comprises a cutter and a biased plunger located interjacent said bellows.
Claim 7
Dependent Claim
21 words
The device recited in claim 5 wherein said piercing means includes an adjusting means which is vented to ambient air pressure.
Claim 8
Dependent Claim
62 words
The device recited in claim 2 wherein said venting ports comprise an internal venting port and an external venting port wherein said interal port is in communication with said first chamber whereby the internal air pressure impinges on said compressing means and said diaphragm, said external port opening onto said piercing means and said diaphragm and in communication with ambient air pressure.
Claim 9
Dependent Claim
34 words
The device recited in claim 7 wherein said compressing means is operatively connected to said piercing means whereby said internal air pressure equals said ambient air pressure after said piercing means pierces said diaphragm.
Claim 10
Dependent Claim
17 words
The device recited in claim 8 wherein said compressing means is compressed independently of said piercing means.
Claim 11
Dependent Claim
21 words
The device recited in claim 9 wherein said compressing means is a bellows and said piercing means comprises a 4-blade cutter.
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) | 1976-07-02 | 1977-01-01 | 1977-07-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-02 | 1981-01-01 | 1981-07-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-02 | 1985-01-01 | 1985-07-03 | $7700.00 | Window Closed / Lapsed |