US3960177A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low torque and low noise butterfly valve disc
Assignee: Individual
•
Filing: 1975-03-12
•
Granted: 1976-06-01
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Expires: 1995-03-12
Abstract
Abstract A butterfly valve disc with generally oval plane surface, tiltingly arranged so that the outer periphery forms a perfect circle intersecting with the inner bore of a butterfly valve, and where the outer rim of the disc further supports a row of ribs arranged generally parallel to the circular bore of said butterfly valve and pointing in opposite directions below and above the disc's horizontal axis and forming between themselves a number of flow passages, the trapezoidal cross-section of which gradually constricts the fluid towards its discharge side.
Inventors
- 👤 Hans D. Baumann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:32
CPC Classifications
F; F16; F16K; F16K1/00; F16K1/16; F16K1/18; F16K1/22; F16K1/222; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/86493; Y10T137/86718; Y10T137/86743
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
213 words
A low torque and low noise butterfly valve disc comprising: a. an oval shaped disc, the outer periphery being angularly off-set from the perpendicular axis of a straight, cylindrical bore of a butterfly valve and fitting closely within said cylindrical bore when in the closed valve position, one side of said disc facing up-stream, the other to the downstream side of said butterfly valve; b. a central, perpendicular hub section straddling the shortest width of said oval shaped disc and containing within a bore to receive a supporting valve shaft; c. a series of ribs protruding out of each side of said disc near the outer periphery of said disc and extending generally parallel to the longitudinal axis of said cylindrical bore of a butterfly valve, when viewed in the closed valve position, and forming two semi-circular rows, the protruding lenght of said ribs diminishing towards said hub section, one of said rows of ribs being located on the upstream side of said disc, while the other is located on the downstream side; said series of ribs forming substantial fluid impediments by extending into the path of fluid passing parallel to each side of said disc when in the open valve position; d. a number of fluid conducting passages formed between adjoining ribs.
Claim 2
Dependent Claim
213 words
A low torque and low noise butterfly valve disc comprising: a. an oval shaped disc, the outer periphery being angularly off-set from the perpendicular axis of a straight, cylindrical bore of a butterfly valve and fitting closely within said cylindrical bore when in the closed valve position, one side of said disc facing up-stream, the other to the downstream side of said butterfly valve; b. a central, perpendicular hub section straddling the shortest width of said oval shaped disc and containing within a bore to receive a supporting valve shaft; c. a series of ribs protruding out of each side of said disc near the outer periphery of said disc and extending generally parallel to the longitudinal axis of said cylindrical bore of a butterfly valve, when viewed in the closed valve position, and forming two semi-circular rows, the protruding lenght of said ribs diminishing towards said hub section, one of said rows of ribs being located on the upstream side of said disc, while the other is located on the downstream side; said series of ribs forming substantial fluid impediments by extending into the path of fluid passing parallel to each side of said disc when in the open valve position; d. a number of fluid conducting passages formed between adjoining ribs.
Claim 3
Dependent Claim
39 words
A low torque and low noise butterfly valve disc as described in claim 1, wherein one half of said oval shaped disc is curved concavely, while the other half is curved convexly towards the upstream side of said disc.
Claim 4
Dependent Claim
35 words
A low torque and low noise butterfly valve disc as described in claim 1, wherein said fluid conducting passages consist of slots of trapezoidal cross-section whose larger width provides smooth entrance ways for passing fluids.
Claim 5
Dependent Claim
43 words
A low torque and low noise butterfly valve disc as described in claim 1, wherein said rows of ribs are arranged inside a diameter slightly smaller than that of the bore of a butterfly valve to avoid interference during rotation of said disc.
References Cited (Backward Citations)
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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) | 1979-06-01 | 1979-12-01 | 1980-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-06-01 | 1983-12-01 | 1984-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-06-01 | 1987-12-01 | 1988-06-01 | $7700.00 | Window Closed / Lapsed |