Patent US3787026A successfully refreshed from Google Patents.
US3787026A
Expired / Lapsed
US
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Chromatography valve
Assignee: DANIEL ELECTRONICS INSTRUMENTATION Corp
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Filing: 1972-11-24
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Granted: 1974-01-22
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Expires: 1992-11-24
Abstract
Abstract A valve using a valve body having a plurality of valving elements, each valving element including three fluid ports located on a flat face of the valve body. Fluid passages are provided in the valve body to communicate with the fluid ports. A corresponding resilient member covers each valving element and is selectively urged toward the flat face to seal the fluid ports in the respective valving elements from each other. A pair of concentric fluid actuated plungers are slidably supported in a plunger body located on the other side of the resilient member from the valving element and having operative ends arranged to bear on the resilient member. The concentric plungers are selectively urged against the resilient member by either a fluid pressure supplied to a closed volume defined by the other ends of the concentric plungers, by the fluid pressure of a fluid being controlled by the valve or by a stationary spring means arranged to apply axial pressure to one of the plungers.
Inventors
- 👤 J Lazar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 03:44
CPC Classifications
F; F16; F16K; F16K31/00; F16K31/12; F16K31/126; F16K7/00; F16K7/12; G; G01; G01N; G01N30/00; G01N30/02; G01N30/04; G01N30/16; G01N30/22; G01N30/20; G01N2030/205
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
190 words
A valve comprising a valve body having a plurality of fluid passages therein extending between fluid ports in a face and a side of said valve body, a first resilient member covering said face of said valve body and encompassing the locations of said ports, a pair of plungers positioned on the other side of said resilient member from said valve body, a valve block arranged to slidably support said pair of plungers, a first one of said plungers having an operative end adjacent to said resilient member and encompassing an area including a port of one of said fluid passages in said face and a second one of said plungers having an operative end adjacent to said resilient member and encompassing an area including another one of said ports of said fluid passages in said face, second resilient means forming a closed volume between the other end of said first plunger and the other end of said second plunger, means for introducing a control fluid into said closed volume, and means for exerting a pressure against said first plunger to urge said first plunger against said first resilient member.
Claim 2
Dependent Claim
190 words
A valve comprising a valve body having a plurality of fluid passages therein extending between fluid ports in a face and a side of said valve body, a first resilient member covering said face of said valve body and encompassing the locations of said ports, a pair of plungers positioned on the other side of said resilient member from said valve body, a valve block arranged to slidably support said pair of plungers, a first one of said plungers having an operative end adjacent to said resilient member and encompassing an area including a port of one of said fluid passages in said face and a second one of said plungers having an operative end adjacent to said resilient member and encompassing an area including another one of said ports of said fluid passages in said face, second resilient means forming a closed volume between the other end of said first plunger and the other end of said second plunger, means for introducing a control fluid into said closed volume, and means for exerting a pressure against said first plunger to urge said first plunger against said first resilient member.
Claim 3
Dependent Claim
30 words
A valve as set forth in claim 1 wherein said means for forming said closed volume includes a second and a third resilient member having fluid-tight seals with said plungers.
Claim 4
Dependent Claim
44 words
A valve as set forth in claim 1 wherein said first and second plungers are concentric plungers and said area encompassed by said operative end of said second plunger includes said port encompassed by said area of said operative end of said first plunger.
Claim 5
Dependent Claim
35 words
A valve as set forth in claim 3 wherein said means for forming said closed volume includes a second and a third resilient member having fluid-tight seals with an inner one of said concentric plungers.
Claim 6
Dependent Claim
49 words
A valve as set forth in claim 4 wherein said means for exerting a pressure includes a cover over said other end of first one of said concentric plungers and a spring means positioned between said cover and said other end of said first one of said concentric plungers.
Claim 7
Dependent Claim
34 words
A valve as set forth in claim 4 and including a fluid passage having a port lying outside of the area encompassed by said annular ridge of said second one of said concentric plungers.
Claim 8
Dependent Claim
43 words
A valve as set forth in claim 1 wherein said operative end of said first plunger includes an annular ridge encompassing an area including two of said ports of said fluid passages and including said port of said one of said fluid passages.
References Cited (Backward Citations)
US3080887A
Cited
US3601155A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-01-21 | 1977-07-23 | 1978-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-21 | 1981-07-23 | 1982-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-21 | 1985-07-23 | 1986-01-22 | $7700.00 | Window Closed / Lapsed |