Patent US2418750A successfully refreshed from Google Patents.
US3783893A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pivoted weight biased valve
Assignee: Bryan Donkin Co Ltd
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Filing: 1972-11-20
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Granted: 1974-01-08
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Expires: 1992-11-20
Abstract
Abstract A non-return valve having a closure member which pivots on knife-edged bearing portions in contact with flat bearing plates. Aligning means are provided to align the closure member with the valve seat. The valve plate is biased by an upstanding balance weight and a removable domed closure cap is provided to house the balance weight and provide access to the valve.
Inventors
- 👤 G Davison
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 03:38
CPC Classifications
F; F16; F16K; F16K15/00; F16K15/02; F16K15/03; F16K15/034; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7837; Y10T137/7898; Y10T137/7903
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
167 words
A non-return valve comprising: a casing having an aperture therein; a valve seat formed within said casing; a closure member disposed within said casing for movement towards and away from said valve seat; support means connected to said closure member for movement of said closure member towards and away from said valve seat, said support means comprising a plate member having an upstanding portion and oppositely extending knife-edged portions constituting load bearing elements; metal plate members located within said casing and constituting flat bearing surfaces engaged by said knife-edged portions, said metal plate members having aligning means against which the plate member of said support means can abut for aligning said closure member with said valve seat when the valve is closed; a balance weight mounted on the upstanding portion of the plate member of said support means; and a removable cap which closes the aperture in said casing and which can be removed to reveal said flat bearing surfaces engaged by said aligned load bearing elements.
Claim 2
Dependent Claim
167 words
A non-return valve comprising: a casing having an aperture therein; a valve seat formed within said casing; a closure member disposed within said casing for movement towards and away from said valve seat; support means connected to said closure member for movement of said closure member towards and away from said valve seat, said support means comprising a plate member having an upstanding portion and oppositely extending knife-edged portions constituting load bearing elements; metal plate members located within said casing and constituting flat bearing surfaces engaged by said knife-edged portions, said metal plate members having aligning means against which the plate member of said support means can abut for aligning said closure member with said valve seat when the valve is closed; a balance weight mounted on the upstanding portion of the plate member of said support means; and a removable cap which closes the aperture in said casing and which can be removed to reveal said flat bearing surfaces engaged by said aligned load bearing elements.
Claim 3
Dependent Claim
35 words
A non-return valve according to claim 1, in which the removable cap is of domed form and the balance weight is of half round flat form, upstanding within said cap when the valve is closed.
Claim 4
Dependent Claim
75 words
A non-return valve according to claim 1, the closure member including a flexible sealing element carried by a backing plate having an aperture therein, fluid under pressure having access to a space between the backing plate and flexible sealing element through said aperture when the valve is closed, whereby the flexible sealing element is caused to mould itself to the shape of the valve seat against which the closure member has been caused to abut.
Claim 5
Dependent Claim
86 words
A non-return valve according to claim 3, in which the flexible sealing element is clamped against the backing plate by a clamping plate slightly smaller in diameter than the diameter of the flow passage so that there is formed an annular space between the periphery of said clamping plate and the internal surface of the flow passage when the valve is closed into which the flexible sealing element tends to balloon when acted upon by fluid pressure acting between the backing plate and said sealing element.
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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) | 1977-01-07 | 1977-07-09 | 1978-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-07 | 1981-07-09 | 1982-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-07 | 1985-07-09 | 1986-01-08 | $7700.00 | Window Closed / Lapsed |