US3565394A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Butterfly valve
Assignee: TEXAS VALVE SPECIALTY Inc
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Filing: 1968-12-04
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Granted: 1971-02-23
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Expires: 1988-12-04
Abstract
Abstract A butterfly valve having annular flow passage and seat with disc mounted on shaft for rotation therein. Disc has lip seal at its periphery with outwardly facing convex seal surface surrounding shaft and engaging inwardly facing concave seal surface on seat with seal surfaces being in shape of segment of sphere struck on substantially same radius as radius of annular seat.
Inventors
- 👤 George W Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 07:29
CPC Classifications
F; F16; F16K; F16K1/00; F16K1/16; F16K1/18; F16K1/22; F16K1/226; F16K1/2263; F16K1/2265
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
178 words
A butterfly-type valve comprising: a. a body having a flow passage therethrough with an annular seat on the inner surface thereof; b. a valve disc mounted in said flow passage for rotation about an axis perpendicular to the axis of said flow passage and having a lip seal at its periphery engageabLe with said annular seat; c. an operating shaft extending transversely of said flow passage and through said valve disc; d. said valve disc having an outwardly facing convex seal surface surrounding said shaft with said convex seal surface being in the shape of a segment of a sphere struck on substantially the same radius as the radius of said annular seat; and e. said annular seat having an inwardly facing concave seal surface in the shape of a segment of a sphere struck on substantially the same radius as the radius of said annular seat and engageable with said convex seal surface of said valve disc with a positive fit for sealing therebetween to prevent the flow of fluids to said shaft from said flow passage.
Claim 2
Dependent Claim
178 words
A butterfly-type valve comprising: a. a body having a flow passage therethrough with an annular seat on the inner surface thereof; b. a valve disc mounted in said flow passage for rotation about an axis perpendicular to the axis of said flow passage and having a lip seal at its periphery engageabLe with said annular seat; c. an operating shaft extending transversely of said flow passage and through said valve disc; d. said valve disc having an outwardly facing convex seal surface surrounding said shaft with said convex seal surface being in the shape of a segment of a sphere struck on substantially the same radius as the radius of said annular seat; and e. said annular seat having an inwardly facing concave seal surface in the shape of a segment of a sphere struck on substantially the same radius as the radius of said annular seat and engageable with said convex seal surface of said valve disc with a positive fit for sealing therebetween to prevent the flow of fluids to said shaft from said flow passage.
Claim 3
Dependent Claim
43 words
A butterfly-type valve as defined in claim 1 in which the outer surface of said lip seal at the periphery of said valve disc, as viewed in cross section, is struck on a spherical radius substantially equal the radius of said annular seat.
Claim 4
Dependent Claim
52 words
A butterfly-type valve as defined in claim 1 in which said annular seat is provided with diametrically opposed apertures therein for receiving said operating shaft and a said concave seal surface surrounds each of said apertures with a said convex seal surface of said valve disc engaging each said concave seal surface.
Claim 5
Dependent Claim
65 words
A butterfly-type valve as defined in claim 1 in which an annular recess is provided in the inner surface of said concave seal surface of said annular seat adjacent and surrounding said operating shaft and an O-ring is mounted in said recess to define a seal between said concave seal surface and said shaft and between said concave seal surface and said convex seal surface.
Claim 6
Dependent Claim
56 words
A butterfly-type valve as defined in claim 4 in which the entire bottom of said annular recess in said concave seal surface is struck on a spherical radius which is the same distance from the axial center of said annular seat so that said annular recess is the same depth all the way around said shaft.
Claim 7
Dependent Claim
36 words
A butterfly-type valve as defined in claim 1 in which said lip seal at the periphery of said valve disc comprises a plurality of circumferential lips spaced laterally from each other as viewed in cross section.
Claim 8
Dependent Claim
41 words
A butterfly-type valve as defined in claim 1 in which said annular seat on the inner surface of said flow passage and the outer surface of said valve disc including the lip seal is in the form of a protective covering.
Claim 9
Dependent Claim
17 words
A butterfly-type valve as defined in claim 7 in which said protective covering is a fluorocarbon resin.
Claim 10
Dependent Claim
16 words
A butterfly-type valve as defined in claim 8 in which the fluorocarbon resin is polyvinylidene fluoride.
Claim 11
Dependent Claim
33 words
A butterfly-type valve as defined in claim 1 in which a slight interference fit is provided between said valve disc and said annular seat ranging from approximately .003 to .004 of an inch.
References Cited (Backward Citations)
US1977351A
Cited
US3072139A
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US3173650A
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US3325142A
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US3376015A
Cited
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Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-02-22 | 1974-08-24 | 1975-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-22 | 1978-08-24 | 1979-02-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-22 | 1982-08-24 | 1983-02-23 | $7700.00 | Window Closed / Lapsed |