Patent EP0538858A1 successfully refreshed from Google Patents.
US4223430A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for making seat assembly for butterfly valves
Assignee: Crane Co
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Filing: 1978-12-01
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Granted: 1980-09-23
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Expires: 1998-12-01
Abstract
Abstract A method of making an improved seat assembly for a butterfly valve. The seat assembly comprises a flexible, circular metal band embedded in a resilient material to form an annular seat assembly. The assembly is made by supporting the band in a fixed spatial position on movable finger members, positioning a mold about, but spaced from, the band, and molding the annular seat assembly in the mold to embed the band. The invention is also directed toward an improved seat assembly. In a preferred embodiment the circular band is made of two curved sections overlapping at the two joints and having diametrically opposite holes in the two overlapping areas.
Inventors
- 👤 Michael Sherlaw
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:46
CPC Classifications
F; F16; F16K; F16K1/00; F16K1/16; F16K1/18; F16K1/22; F16K1/226; F16K1/2263; F16K1/2265; B; B23; B23P; B23P15/00; B23P15/001; B29; B29C; B29C45/00; B29C45/14; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49405; Y10T29/49409
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
116 words
A method of making a resilient valve seat assembly having a flexible ring therein for a butterfly valve comprising, providing two substantially C-shaped circular band segments each having circumferential ends with the ends of each segment having holes therein forming a flexible circular band by overlapping the ends of the two part circular band segments with the holes in alignment and joining the overlapped ends together, therein supporting the circular band in a fixed spatial position, positioning a mold about but spaced from the band while the band is supported, and molding an annular seat member from resilient material while the mold is positioned about the band to substantially embed the band within the seat member.
Claim 2
Independent Claim
116 words
A method of making a resilient valve seat assembly having a flexible ring therein for a butterfly valve comprising, providing two substantially C-shaped circular band segments each having circumferential ends with the ends of each segment having holes therein forming a flexible circular band by overlapping the ends of the two part circular band segments with the holes in alignment and joining the overlapped ends together, therein supporting the circular band in a fixed spatial position, positioning a mold about but spaced from the band while the band is supported, and molding an annular seat member from resilient material while the mold is positioned about the band to substantially embed the band within the seat member.
Claim 3
Dependent Claim
41 words
The method as claimed in claim 1 wherein the band is supported by opposed support members, the support members moved toward each other, in a direction substantially perpendicular to the outer face of the band, to support the band between them.
Claim 4
Dependent Claim
25 words
The method as claimed in claim 2 wherein the support members hold the circular band in a horizontal plane and prevent it from moving horizontally.
Claim 5
Dependent Claim
42 words
The method as claimed in claim 3 wherein one portion of the support members are moved into notches formed in the bottom edge of the band, and another portion of the support members are moved against the outer face of the band.
Claim 6
Dependent Claim
29 words
The method as claimed in claim 2 wherein the mold comprising at least two movable mating parts is also positioned about opposed support members when they support the band.
Claim 7
Dependent Claim
14 words
The methods as claimed in claim 1 wherein the overlapped ends are spot-welded together.
Claim 8
Dependent Claim
46 words
The method as claimed in claim 1 wherein the hole in each of the ends being of the same size, and the band is assembled by inserting the holes of the ends of the two part segments over a circular rod to form two overlapped ends.
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) | 1983-09-23 | 1984-03-24 | 1984-09-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-09-23 | 1988-03-24 | 1988-09-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-09-23 | 1992-03-24 | 1992-09-23 | $7700.00 | Window Closed / Lapsed |