US3726504A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Corrosion resistant valving edge for butter-fly valve disc
Assignee: SPX Technologies Inc
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Filing: 1971-04-02
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Granted: 1973-04-10
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Expires: 1991-04-02
Abstract
Abstract The disclosure concerns a scheme for providing a corrosion resistant valving edge of the rotatable disc of a butterfly valve. The valving edge is defined by a ring of corrosion resistant material which is shrink fitted into an annular groove formed in the periphery of the disc. The ring is subjected to a substantial hoop stress which compresses it tightly against the surface of the groove and retains it in place. In some cases, however, this self-retaining action may be supplemented by tack welding the ring to the disc.
Inventors
- 👤 K Kormos
- 👤 D Szilagyi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 07:24
CPC Classifications
F; F16; F16K; F16K1/00; F16K1/16; F16K1/18; F16K1/22; F16K1/226
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
74 words
A rotatable disc for a butterfly valve characterized by a rigid corrosion resistant valving edge defined by a ring of rigid corrosion resistant material which is seated in a continuous annular groove formed in the periphery of the disc, the ring being under a substantial hoop stress and being compressed tightly against the surface of the groove, and the groove being dimensioned and locAted to permit installation of the ring by shrink fitting technique.
Claim 2
Dependent Claim
74 words
A rotatable disc for a butterfly valve characterized by a rigid corrosion resistant valving edge defined by a ring of rigid corrosion resistant material which is seated in a continuous annular groove formed in the periphery of the disc, the ring being under a substantial hoop stress and being compressed tightly against the surface of the groove, and the groove being dimensioned and locAted to permit installation of the ring by shrink fitting technique.
Claim 3
Dependent Claim
31 words
The butterfly valve disc defined in claim 1 in which the ring has a rounded outer peripheral portion and an inner peripheral portion which is shaped to conform to the groove.
Claim 4
Dependent Claim
17 words
The butterfly valve disc defined in claim 2 in which the ring has a circular cross section.
Claim 5
Dependent Claim
39 words
The butterfly valve disc defined in claim 1 in which the contact pressure between the ring and the surface of the groove is at least four times the pressure rating of the valve in which the disc is used.
Claim 6
Dependent Claim
74 words
The butterfly valve disc defined in claim 1 in which a. the surface of the groove has a medial portion of minimum diameter and end portions having greater, but unequal, diameters, the end portion of larger diameter being closer to the rotational axis of the disc than the other end portion; and b. the ring, in the unstressed state, has a smaller inside diameter than the diameter of the medial portion of the groove.
Claim 7
Dependent Claim
24 words
The butterfly valve disc defined in claim 1 in which the ring is tack welded to the disc at spaced points around its circumference.
Claim 8
Dependent Claim
33 words
The butterfly valve disc defined in claim 1 in which the surface of the groove has a depressed medial portion which is spaced radially inward from the inner peripheral surface of the ring.
Claim 9
Dependent Claim
107 words
In a butterfly valve including a body formed with a through flow passage which is encircled by an elastomeric seat and contains a rotatable disc, the improvement comprising a rigid valving edge on the disc which coacts with the seat to control flow through said passage and is defined by a ring of rigid, corrosion resistant material which is seated in a continuous annular groove formed in the periphery of the disc, the ring being under a substantial hoop stress and being compressed tightly against the surface of the groove, and the groove being dimensioned and located to permit installation of the ring by shrink fit technique.
Claim 10
Dependent Claim
107 words
In a butterfly valve including a body formed with a through flow passage which is encircled by an elastomeric seat and contains a rotatable disc, the improvement comprising a rigid valving edge on the disc which coacts with the seat to control flow through said passage and is defined by a ring of rigid, corrosion resistant material which is seated in a continuous annular groove formed in the periphery of the disc, the ring being under a substantial hoop stress and being compressed tightly against the surface of the groove, and the groove being dimensioned and located to permit installation of the ring by shrink fit technique.
Claim 11
Dependent Claim
37 words
An improved butterfly valve as defined in claim 8 in which said ring has a rounded outer peripheral portion which engages said elastomeric seat, and an inner peripheral portion which is shaped to conform to said groove.
Claim 12
Dependent Claim
18 words
An improved butterfly valve as defined in claim 9 in which said ring has a circular cross section.
Claim 13
Dependent Claim
34 words
An improved butterfly valve as defined in claim 8 in which the contact pressure between said ring and the surface of the groove is at least four times the pressure rating of the valve.
Claim 14
Dependent Claim
75 words
An improved butterfly valve as defined in claim 8 in which a. the surface of the groove has a medial portion of minimum diameter and end portions having greater, but unequal, diameters, the end portion of larger diameter being closer to the rotational axis of the disc than the other end portion; and b. the ring, in the unstressed state, has a smaller inside diameter than the diameter of the medial portion of the groove.
Claim 15
Dependent Claim
25 words
An improved butterfly valve as defined in claim 8 in which said ring is tack welded to the disc at spaced points around its circumference.
Claim 16
Dependent Claim
34 words
An improved butterfly valve as defined in claim 8 in which the surface of the groove has a depressed medial portion which is spaced radially inward from the inner peripheral surface of the ring.
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) | 1976-04-09 | 1976-10-09 | 1977-04-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-09 | 1980-10-09 | 1981-04-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-09 | 1984-10-09 | 1985-04-10 | $7700.00 | Window Closed / Lapsed |