Patent US3698412A successfully refreshed from Google Patents.
US3698412A
Expired / Lapsed
US
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Differential pressure control
Assignee: National Aeronautics and Space Administration
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Filing: 1970-06-26
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Granted: 1972-10-17
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Expires: 1990-06-26
Abstract
Abstract A differential pressure control for activation in response to the difference in pressure between two applied pressures wherein one pressure is applied to an outer side of a first diaphragm and the other pressure is applied to an outer side of a second diaphragm. The inner sides of the diaphragms are positioned face to face within a central chamber to which is applied a reference pressure. An electrical switch is operated by the movement of one of the diaphragms in response to a difference in the applied pressures, which response is a function of the reference pressure, the ratio of diaphragm surface areas, and one of the applied pressures.
Inventors
- 👤 Harold M Smyly
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 07:46
CPC Classifications
F; F15; F15B; F15B5/00; Y; Y10; Y10T; Y10T137/00; Y10T137/1842; Y10T137/1939; Y10T137/2012; Y10T137/7722; Y10T137/7758; Y10T137/7761
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
384 words
A differential pressure control comprising: a casing; a first substantially planar diaphragm inside said casing, said first diaphragm being mounted on first mounting means for supporting the periphery of said first diaphragm on said casing, whereby the central portion of said first diaphragm is movable in a direction normal to planar surfaces thereof in response to a difference in pressure on opposite sides thereof, the outer surface of said first diaphragm and a first interior wall portion of said casing comprising a first pressure chamber; a second substantially planar diaphragm inside said casing, said second diaphragm being mounted in close proximity to said first diaphragm on second mounting means for supporting the periphery of said second diaphragm on said casing whereby the central portion of said second diaphragm is movable in a direction normal to planar surfaces thereof in response to a difference in pressure on opposite sides thereof and capable of physically touching the central portion of said first planar diaphragm, the outer surface of said second diaphragm and a second interior wall portion of said casing comprising a second pressure chamber; an enclosed central pressure chamber formed by said first and second diaphragms and by portions of the inner surface of said casing; a first pressure source; first coupling means for applying pressure from said first pressure source to the outer planar surface of said first diaphragm and to said first pressure chamber; a second pressure source; second coupling means for applying pressure from said second pressure source to the outer planar surface of said second diaphragm and to said second pressure chamber; diaphragm movement sensing means supported by said casing and responsive to movement of said first diaphragm by said second diaphragm for providing a physical output; control means responsive to said diaphragm movement sensing means for affecting the pressure in at least one of said pressure chambers whereby a difference in pressures between said first and second sources is obtained which is a selected variable function of the pressure in at least one of said pressure chambers; said control means comprising valve means responsive to said diaphragm movement sensing means for connecting said first and second pressure sources in response to a differential pressure which is a selected variable function of the pressure of one of said sources of pressure.
Claim 2
Dependent Claim
384 words
A differential pressure control comprising: a casing; a first substantially planar diaphragm inside said casing, said first diaphragm being mounted on first mounting means for supporting the periphery of said first diaphragm on said casing, whereby the central portion of said first diaphragm is movable in a direction normal to planar surfaces thereof in response to a difference in pressure on opposite sides thereof, the outer surface of said first diaphragm and a first interior wall portion of said casing comprising a first pressure chamber; a second substantially planar diaphragm inside said casing, said second diaphragm being mounted in close proximity to said first diaphragm on second mounting means for supporting the periphery of said second diaphragm on said casing whereby the central portion of said second diaphragm is movable in a direction normal to planar surfaces thereof in response to a difference in pressure on opposite sides thereof and capable of physically touching the central portion of said first planar diaphragm, the outer surface of said second diaphragm and a second interior wall portion of said casing comprising a second pressure chamber; an enclosed central pressure chamber formed by said first and second diaphragms and by portions of the inner surface of said casing; a first pressure source; first coupling means for applying pressure from said first pressure source to the outer planar surface of said first diaphragm and to said first pressure chamber; a second pressure source; second coupling means for applying pressure from said second pressure source to the outer planar surface of said second diaphragm and to said second pressure chamber; diaphragm movement sensing means supported by said casing and responsive to movement of said first diaphragm by said second diaphragm for providing a physical output; control means responsive to said diaphragm movement sensing means for affecting the pressure in at least one of said pressure chambers whereby a difference in pressures between said first and second sources is obtained which is a selected variable function of the pressure in at least one of said pressure chambers; said control means comprising valve means responsive to said diaphragm movement sensing means for connecting said first and second pressure sources in response to a differential pressure which is a selected variable function of the pressure of one of said sources of pressure.
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) | 1975-10-17 | 1976-04-17 | 1976-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-17 | 1980-04-17 | 1980-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-17 | 1984-04-17 | 1984-10-17 | $7700.00 | Window Closed / Lapsed |