Patent US2035305A successfully refreshed from Google Patents.
Patent US3717176A successfully refreshed from Google Patents.
US3717176A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic valve
Assignee: EIDP Inc
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Filing: 1971-02-26
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Granted: 1973-02-20
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Expires: 1991-02-26
Abstract
Abstract The use of a plurality of small fluid tight tubes made from a polyfluorinated plastic in place of the collapsible elastomeric bladder in a hydraulically activated valve, provides a valve which can be used to shut off or control the flow of corrosive liquids in a fluid line.
Inventors
- 👤 R Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 17:10
CPC Classifications
F; F16; F16K; F16K7/00; F16K7/02; F16K7/04; F16K7/07; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/87265; Y10T137/8741; Y10T137/87434
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
154 words
In a control valve for use with corrosive liquids of the type comprising an external housing having a pair of flanged ends to connect said housing into a fluid line, a deformable conduit connected at its ends in fluid tight arrangement to the flanged ends of said housing to provide a fluid path through said housing for the liquid flowing through the fluid line, means for introducing a control fluid into the space between said external housing and said deformable conduit, and means to control the pressure of said control fluid within said housing, the improvement wherein said deformable conduit comprises a plurality of small fluid tight tubes of polyfluorinated plastic having their ends secured in fixed fluid tight relationship to the flanged ends of said housing, said tubes having an outside diameter ranging from 0.1 to about 0.55 inch and a wall thickness ranging from 5 to 20 percent of their outside diameter.
Claim 2
Dependent Claim
154 words
In a control valve for use with corrosive liquids of the type comprising an external housing having a pair of flanged ends to connect said housing into a fluid line, a deformable conduit connected at its ends in fluid tight arrangement to the flanged ends of said housing to provide a fluid path through said housing for the liquid flowing through the fluid line, means for introducing a control fluid into the space between said external housing and said deformable conduit, and means to control the pressure of said control fluid within said housing, the improvement wherein said deformable conduit comprises a plurality of small fluid tight tubes of polyfluorinated plastic having their ends secured in fixed fluid tight relationship to the flanged ends of said housing, said tubes having an outside diameter ranging from 0.1 to about 0.55 inch and a wall thickness ranging from 5 to 20 percent of their outside diameter.
Claim 3
Dependent Claim
14 words
The valve of claim 1 wherein said polyfluorinated plastic is a polymer of tetrafluoroethylene.
Claim 4
Dependent Claim
16 words
The valve of claim 1 wherein said polyfluorinated plastic is a copolymer of tetrafluoroethylene and hexafluoropropylene.
Claim 5
Dependent Claim
23 words
The valve of claim 1 wherein each of said tubes contains a central region having a cross section preformed into an elliptical shape.
Claim 6
Dependent Claim
27 words
The valve of claim 1 wherein each of said tubes has been pre-collapsed in a central region so that future collapse will occur preferentially in this region.
Claim 7
Dependent Claim
42 words
The valve of claim 1 wherein the exterior of the ends of said tubes adjacent the ends of said housing are potted in an elastomer to prevent rupture of the fluid tight connection between the ends of said tubes and said housing.
Claim 8
Dependent Claim
34 words
The valve of claim 1 comprising a plurality of small tubes each made from a polymer of tetrafluoroethylene and having outside diameters of about 0.25 inch and a wall thickness of about 0.025 inch.
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) | 1976-02-20 | 1976-08-21 | 1977-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-20 | 1980-08-21 | 1981-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-20 | 1984-08-21 | 1985-02-20 | $7700.00 | Window Closed / Lapsed |