US3556138A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Nonreturn valves
Assignee: AMIS
•
Filing: 1968-07-30
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Granted: 1971-01-19
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Expires: 1988-07-30
Abstract
Abstract A nonreturn valve for liquids has a tapered end formed by flexible inclined walls terminating in a slit which is defined between two flexible lips. A continuous raised rib is formed on the internal surface of one of the lips and makes linear sealing contact with a corresponding force of the other lip inwardly of the slit effectively to cut off flow through the slit upon closure of the valve.
Inventors
- 👤 Nicola D Urso
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:16
CPC Classifications
F; F16; F16K; F16K15/00; F16K15/14; F16K15/144; F16K15/147; F16K15/1402; F16K15/1441; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7837; Y10T137/7838; Y10T137/7839; Y10T137/784; Y10T137/7843; Y10T137/7866; Y10T137/7879; Y10T137/788; Y10T137/7882; Y10T137/7883
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
141 words
In a nonreturn valve for liquids of the type comprising a hollow valve member of flexible material adapted to be fitted in a flow duct and having a tapering outlet end in the flow path comprising a pair of flexible lips defining a slit which is closed or open in accordance with the relative fluid pressures internally and externally of the valve member, the improvement which comprises a raised rib of substantially wedge-shaped cross section with a sharp edge formed on the internal surface of one of the lips and extending completely across the flexible lip perpendicular to the flow path and a smooth face, adapted to contact said rib, on the internal surface of the other lip, inwardly of the slit-defining edges of the lips, whereby substantially linear sealing contact is established at said rib when the valve is closed.
Claim 2
Dependent Claim
141 words
In a nonreturn valve for liquids of the type comprising a hollow valve member of flexible material adapted to be fitted in a flow duct and having a tapering outlet end in the flow path comprising a pair of flexible lips defining a slit which is closed or open in accordance with the relative fluid pressures internally and externally of the valve member, the improvement which comprises a raised rib of substantially wedge-shaped cross section with a sharp edge formed on the internal surface of one of the lips and extending completely across the flexible lip perpendicular to the flow path and a smooth face, adapted to contact said rib, on the internal surface of the other lip, inwardly of the slit-defining edges of the lips, whereby substantially linear sealing contact is established at said rib when the valve is closed.
Claim 3
Dependent Claim
133 words
A nonreturn valve for liquids as claimed in claim 1, wherein the valve member includes a tubular inlet portion and flexible wall portions formed integrally with the tubular inlet portion, the flexible lips being provided on the wall portions, and a flexible web portion integral with each wall portion at the edge of the wall portion, the web portions that abut each other along each edge of the wall portions being sealingly interconnected, outlet means being formed between the outer edges of the web portions near the inlet end of the valve member and communicate with the interior thereof, such outlet means being closed resiliently when the valve is closed and being open to afford a slit bypass path in response to the pressure within the valve member when the slit is clogged.
Claim 4
Dependent Claim
25 words
Valve according to claim 2, in which the said outlet means comprise respective slit incisions along parts of the interconnected edges of the web portions.
Claim 5
Dependent Claim
34 words
A nonreturn valve for liquids as claimed in claim 1 wherein the smooth face of the other lip is provided at its opposite ends with two shaped notches accommodating the ends of the rib.
Claim 6
Dependent Claim
136 words
A nonreturn valve is claimed in claim 4 wherein the valve member includes a tubular inlet portion and flexible wall portions formed integrally with the tubular inlet portion, a rigid tubular member is disposed coaxially within the tubular inlet portion of the valve member, the tubular member having a tapered end with end surfaces against which the flexible wall portions are adapted, under the influence of back pressure which tend to close the slit, to bear, each wall portion including a rigid reinforcement in the zone in which it is adapted to bear on the end surface of the rigid tubular member, whereby cooperation between the rigid reinforcement of the wall portions and the tapered end of the tubular member resists deformation of the nonreturn valve when that valve is under the influence of back pressure.
Claim 7
Dependent Claim
134 words
A nonreturn valve according to claim 1 wherein the valve member includes a tubular inlet portion and flexible wall portions formed integrally with the tubular inlet portion, a rigid tubular member disposed coaxially within the tubular inlet portion of the valve member, the tubular member having a tapered end with end surfaces against which the flexible wall portions are adapted, under the influenCe of back pressure which tend to close the slit, to bear, each wall portion including a rigid reinforcement in the zone in which it is adapted to bear on the end surfaces of the rigid tubular member, whereby cooperation between the rigid reinforcement of the wall portions and the tapered end of the tubular member resists deformation of the nonreturn valve when that valve is under the influence of back pressure.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-01-18 | 1974-07-20 | 1975-01-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-18 | 1978-07-20 | 1979-01-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-18 | 1982-07-20 | 1983-01-19 | $7700.00 | Window Closed / Lapsed |