Patent US3620944A successfully refreshed from Google Patents.
Patent US3794288A successfully refreshed from Google Patents.
US3794288A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Butterfly valve
Assignee: Sulzer Escher Wyss AG
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Filing: 1973-03-08
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Granted: 1974-02-26
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Expires: 1993-03-08
Abstract
Abstract Butterfly valve for ducts of hydroelectric power stations, with a web in said duct, extending transversely of said duct and being rigidly secured to said duct, and a flap pivotably mounted on said web; a drive mechanism comprising a servo-motor and first connecting means between said flap and said servomotor and second connecting means between said servo-motor and said web; said connecting means being arranged in a plane crossing said duct and being perpendicular to the pivoting axis of said flap.
Inventors
- 👤 G Dolder
- 👤 A Schmalzi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 13:39
CPC Classifications
F; F16; F16K; F16K1/00; F16K1/16; F16K1/18; F16K1/22; F16K1/221
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
117 words
In a butterfly valve having a duct which is closed on all sides, and a flap situated within said duct, for regulating the flow of a fluid medium through said duct, more especially for pressure conduits of hydroelectric power stations; a web extending transversely of said duct and being rigidly secured to two opposite wall portions of said duct; said flap being supported pivotably on said web; a drive mechanism for said flap, including a servo-motor, first connecting means between said flap and said servo-motor, and second connecting means between said servo-motor and said web; said connecting means being situated substantially in a plane crossing said duct and being perpendicular to the pivoting axis of said flap.
Claim 2
Dependent Claim
117 words
In a butterfly valve having a duct which is closed on all sides, and a flap situated within said duct, for regulating the flow of a fluid medium through said duct, more especially for pressure conduits of hydroelectric power stations; a web extending transversely of said duct and being rigidly secured to two opposite wall portions of said duct; said flap being supported pivotably on said web; a drive mechanism for said flap, including a servo-motor, first connecting means between said flap and said servo-motor, and second connecting means between said servo-motor and said web; said connecting means being situated substantially in a plane crossing said duct and being perpendicular to the pivoting axis of said flap.
Claim 3
Dependent Claim
45 words
Butterfly valve according to claim 1, in which the cross-section of said web comprises an edge, said flap bearing pivotably on said edge; and at least two bearings for centering the flap on the pivoting axis, said bearings carrying the dead weight of said flap.
Claim 4
Dependent Claim
18 words
Butterfly valve according to claim 1, in which said servo-motor is situated in the interior of said duct.
Claim 5
Dependent Claim
27 words
BUtterfly valve according to claim 3, in which the main axis of said servo-motor extends at least approximately in the direction of flow of the fluid medium.
Claim 6
Dependent Claim
15 words
Butterfly valve according to claim 3, in which said servo-motor abuts directly on said web.
Claim 7
Dependent Claim
46 words
Butterfly valve according to claim 1, in which said second connecting means between said servo-motor and said web comprise a support which is arranged at right angles to said web and is secured to said web as well as to a wall portion of said duct.
Claim 8
Dependent Claim
29 words
Butterfly valve according to claim 6, in which said support is a twin support having two halves, at least part of said connecting means being situated between said halves.
Claim 9
Dependent Claim
41 words
Butterfly valve according to claim 7, in which said twin support is constructed as a hollow rib, and said first connecting means between said flap and said servo-motor are, in the fully open position of said flap, situated in said rib.
Claim 10
Dependent Claim
12 words
Butterfly valve according to claim 2, in which said edge is rounded.
Claim 11
Dependent Claim
25 words
Butterfly valve according to claim 2, in which said edge extends over more than half the width of said flap, measured in the pivoting axis.
Claim 12
Dependent Claim
24 words
Butterfly valve according to claim 2, in which said edge extends substantially over the entire width of said flap, measured in the pivoting axis.
Claim 13
Dependent Claim
21 words
Butterfly valve according to claim 2, in which a round-section rod forms said edge, said rod being secured to said web.
Claim 14
Dependent Claim
31 words
Butterfly valve according to claim 12, in which said web comprises apertures which are bridged by said rod; and bearing stirrups secured on said flap, said stirrups extending through said apertures.
Claim 15
Dependent Claim
14 words
Butterfly valve according to claim 12, in which said rod consists of non-rusting material.
Claim 16
Dependent Claim
18 words
Butterfly valve according to claim 2, in which a strip secured on said flap bears on said edge.
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) | 1977-02-25 | 1977-08-27 | 1978-02-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-25 | 1981-08-27 | 1982-02-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-25 | 1985-08-27 | 1986-02-26 | $7700.00 | Window Closed / Lapsed |