US3670760A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Backflow preventer
Assignee: A W Cash Valve Manufacturing Corp
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Filing: 1970-08-13
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Granted: 1972-06-20
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Expires: 1990-08-13
Abstract
Abstract A backflow preventer for preventing reverse water flow having as a part thereof a transverse wall between inlet and outlet water passages and with a valve disc in the form of an annular member mounted to be resiliently urged against said transverse wall and block a series of circularly disposed flow passages at all times except when normal water flow occurs through the backflow preventer. The valve disc is simply constructed of a resilient material in planar form and is mounted to be dished and urged against said transverse wall for seating engagement therewith.
Inventors
- 👤 James Butcher
- 👤 Richard G Gyllstrom
- 👤 William Doyle Lamb
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:36
CPC Classifications
F; F16; F16K; F16K24/00; F16K24/06; F16K15/00; F16K15/14; F16K15/141; F16K15/142; Y; Y10; Y10T; Y10T137/00; Y10T137/3149; Y10T137/3185; Y10T137/3294; Y10T137/3331
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
171 words
A backflow preventer comprising a body having a central passage with an externally threaded section for connection to a hose and an annular raised rim surrounding a recess, a series of air relief holes connecting said recess with the exterior of the body, an adapter having an internally threaded section to fit onto a water supply line, a reduced portion of said adapter including a transverse wall fitted into said recess, a series of circularly disposed flow openings in said transverse wall arranged to leave a solid central portion of said wall, an annular disc between the adapter and body, and means on said body engaging the underside of said disc at the outer periphery thereof to urge the disc upwardly to be pressed against said transverse wall and close off communication between said flow openings and said central passage whereby normal flow of water will press the disc away from the flow openings to permit flow to said central passage and cause the disc to block the air relief holes.
Claim 2
Dependent Claim
171 words
A backflow preventer comprising a body having a central passage with an externally threaded section for connection to a hose and an annular raised rim surrounding a recess, a series of air relief holes connecting said recess with the exterior of the body, an adapter having an internally threaded section to fit onto a water supply line, a reduced portion of said adapter including a transverse wall fitted into said recess, a series of circularly disposed flow openings in said transverse wall arranged to leave a solid central portion of said wall, an annular disc between the adapter and body, and means on said body engaging the underside of said disc at the outer periphery thereof to urge the disc upwardly to be pressed against said transverse wall and close off communication between said flow openings and said central passage whereby normal flow of water will press the disc away from the flow openings to permit flow to said central passage and cause the disc to block the air relief holes.
Claim 3
Dependent Claim
67 words
A backflow preventer as defined in claim 1 wherein said means engaging the underside of the annular disc includes an upwardly inclined seating flange on said body and a ring on the opposite side of the disc with said ring pressed against the disc by assembly of the adapter and body with the reduced portion of the adapter fitted into the annular raised rim of the body.
Claim 4
Dependent Claim
17 words
A backflow preventer as defined in claim 2 wherein said annular disc is of rubber-like resilient material.
Claim 5
Dependent Claim
17 words
A backflow preventer as defined in claim 3 wherein said disc is of neoprene or the like.
Claim 6
Dependent Claim
39 words
A backflow preventer as defined in claim 2 including means integral with said disc and extending into said central passage for manual engagement to flex said disc and uncover said flow openings for drainage of water from said adapter.
Claim 7
Dependent Claim
169 words
A baCkflow preventer having inlet and outlet water passages in line and separated from each other by a transverse wall, said transverse wall having a series of circularly disposed flow openings surrounding a central solid portion of said wall, an annular valve disc of resilient material coacting with said flow openings to permit water flow from the inlet water passage to the water outlet passage but preventing reverse flow, said valve disc being formed as a planar member, and means on said body engaging the underside of said disc at the outer periphery thereof to urge the disc upwardly to press against said transverse wall with the inner periphery of the disc engaging the wall internally of the circularly disposed flow openings to seal off said flow openings, whereby normal water flow will move the disc away from the transverse wall and the water can flow through the central opening of the disc to the outlet water passage with the disc returning to its seat upon termination of flow.
Claim 8
Dependent Claim
169 words
A baCkflow preventer having inlet and outlet water passages in line and separated from each other by a transverse wall, said transverse wall having a series of circularly disposed flow openings surrounding a central solid portion of said wall, an annular valve disc of resilient material coacting with said flow openings to permit water flow from the inlet water passage to the water outlet passage but preventing reverse flow, said valve disc being formed as a planar member, and means on said body engaging the underside of said disc at the outer periphery thereof to urge the disc upwardly to press against said transverse wall with the inner periphery of the disc engaging the wall internally of the circularly disposed flow openings to seal off said flow openings, whereby normal water flow will move the disc away from the transverse wall and the water can flow through the central opening of the disc to the outlet water passage with the disc returning to its seat upon termination of flow.
Claim 9
Dependent Claim
52 words
A backflow preventer as defined in claim 6 wherein a series of air relief holes are provided at the opposite side of the valve disc with the disc closing off said holes during normal water flow conditions, said holes being open to atmosphere when the disc is pressed against the transverse wall.
Claim 10
Dependent Claim
46 words
A backflow preventer as defined in claim 6 wherein said disc is of a resilient rubber-like material and said means on the body includes a sloped annular surface at a distance from said transverse wall which causes the dishing of the disc toward the transverse wall.
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) | 1975-06-20 | 1975-12-20 | 1976-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-20 | 1979-12-20 | 1980-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-20 | 1983-12-20 | 1984-06-20 | $7700.00 | Window Closed / Lapsed |