US3818929A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reduced pressure backflow preventer valve
Assignee: Individual
•
Filing: 1973-04-23
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Granted: 1974-06-25
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Expires: 1993-04-23
Abstract
Abstract A backflow preventer valve has a body with a vent chamber, the inner end of which forms a relief valve seat; the base of a cup member, supported on the inner edge of an annular flexible diaphragm with the outer edge secured to the valve body, engages with the relief valve seat to close off the vent chamber. The cup member has an internal check valve seat and contains a check valve biased against the check valve seat.
Inventors
- 👤 H Braukmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 03:35
CPC Classifications
F; F16; F16K; F16K24/00; F16K24/04; E; E03; E03C; E03C1/00; E03C1/02; E03C1/10; E03C1/104; E03C1/108; F16K15/00; Y; Y10; Y10T; Y10T137/00; Y10T137/3149; Y10T137/3185; Y10T137/3294; Y10T137/3331
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
195 words
A back flow preventer valve comprising a valve body, an inlet chamber in said valve body connected to a liquid source, a wall in said valve body defining an intermediate chamber leading exteriorly thereof, the inner end of said wall forming a relief valve seat, a cup like member in said valve body having a base engageable with said relief valve seat to seal off said intermediate chamber, said cup like member having a first opening communicating with said inlet chamber, an outlet chamber in said valve body in part surrounding said intermediate chamber, a second opening in said cup like member communicating with said outlet chamber, a flexible annular membrane secured at its outward edge to said valve body and at its inward edge to said cup like member, a check valve seat in said cup like member, an inlet check valve in said cup like member biased against said check valve seat and movable away therefrom at a predetermined pressure exerted in said inlet chamber, said cup like member being movable from said relief valve seat when back pressure is exerted on said flexible membrane to permit fluid to enter said intermediate chamber.
Claim 2
Dependent Claim
195 words
A back flow preventer valve comprising a valve body, an inlet chamber in said valve body connected to a liquid source, a wall in said valve body defining an intermediate chamber leading exteriorly thereof, the inner end of said wall forming a relief valve seat, a cup like member in said valve body having a base engageable with said relief valve seat to seal off said intermediate chamber, said cup like member having a first opening communicating with said inlet chamber, an outlet chamber in said valve body in part surrounding said intermediate chamber, a second opening in said cup like member communicating with said outlet chamber, a flexible annular membrane secured at its outward edge to said valve body and at its inward edge to said cup like member, a check valve seat in said cup like member, an inlet check valve in said cup like member biased against said check valve seat and movable away therefrom at a predetermined pressure exerted in said inlet chamber, said cup like member being movable from said relief valve seat when back pressure is exerted on said flexible membrane to permit fluid to enter said intermediate chamber.
Claim 3
Dependent Claim
29 words
A valve according to claim 1 having spring means in said intermediate chamber to bear against said cup like member and assist the relieving action of said flexible diaphragm.
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) | 1977-06-24 | 1977-12-24 | 1978-06-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-24 | 1981-12-24 | 1982-06-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-24 | 1985-12-24 | 1986-06-25 | $7700.00 | Window Closed / Lapsed |