US3904173A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Butterfly valve assembly
Assignee: VALV-TECH Inc P O BOX 397 OLD RT 22 WEST FOGELSVILLE PENNSYLVANIA 18051
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Filing: 1973-12-10
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Granted: 1975-09-09
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Expires: 1993-12-10
Abstract
Abstract A butterfly valve assembly includes an elastomeric liner bonded to the inside of the valve body and extending into the neck portion of the valve body. The portion of the elastomeric liner which extends into the neck portion of the valve body encircles the valve stem. A pair of integrally molded circumferential protrusions in the elastomeric liner press against the valve stem and form a leak-proof seal between the elastomeric liner and the valve stem.
Inventors
- 👤 Alexander L Naylor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 11:43
CPC Classifications
F; F16; F16K; F16K1/00; F16K1/16; F16K1/18; F16K1/22; F16K1/226; F16K1/2263; F16K1/2265; F16K1/2268; F16K41/00; F16K41/02; F16K41/08; Y; Y10; Y10T; Y10T137/00; Y10T137/6851; Y10T137/7036
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
189 words
A butterfly valve assembly comprising a valve body having a central cavity bordered by opposed outer faces and a hollow neck portion communicating with said central cavity, a valve stem pivotally mounted within said hollow neck portion, a disc disposed within said central cavity for the purpose of modifying and reversibly closing off flow through the butterfly valve assembly, attachment means for attaching said disc to said valve stem, an elastomeric liner molded and bonded on the outer faces of said valve body adjacent to said central cavity and providing a seal between said disc and said valve body, said elastomeric liner being formed with an integral cylindrical extension extending into said hollow neck portion and encircling said valve stem, said extension being molded onTo and bonded to the inner surface of said hollow neck portion and being formed with at least one integral circumferential annular bead extending inwardly into said hollow neck portion, with said bead projecting toward said valve stem and pressing firmly against the outer surface of said valve stem for the purpose of providing a seal between said elastomeric liner extension and said valve stem.
Claim 2
Dependent Claim
189 words
A butterfly valve assembly comprising a valve body having a central cavity bordered by opposed outer faces and a hollow neck portion communicating with said central cavity, a valve stem pivotally mounted within said hollow neck portion, a disc disposed within said central cavity for the purpose of modifying and reversibly closing off flow through the butterfly valve assembly, attachment means for attaching said disc to said valve stem, an elastomeric liner molded and bonded on the outer faces of said valve body adjacent to said central cavity and providing a seal between said disc and said valve body, said elastomeric liner being formed with an integral cylindrical extension extending into said hollow neck portion and encircling said valve stem, said extension being molded onTo and bonded to the inner surface of said hollow neck portion and being formed with at least one integral circumferential annular bead extending inwardly into said hollow neck portion, with said bead projecting toward said valve stem and pressing firmly against the outer surface of said valve stem for the purpose of providing a seal between said elastomeric liner extension and said valve stem.
Claim 3
Dependent Claim
30 words
A butterfly valve assembly according to claim 1 wherein said annular bead has the form of a ring of semicircular cross-section having a curved surface extending toward said valve stem.
Claim 4
Dependent Claim
54 words
A butterfly valve assembly according to claim 1 wherein said valve stem has an elongated body portion of circular cross-section and said atrtachment means include a hexagonal portion formed on an intermediate portion of said valve stem, and a hexagonal aperture formed along a diameter of said disc and receiving said hexagonal stem portion.
Claim 5
Dependent Claim
31 words
A butterfly valve assembly according to claim 1 wherein said elastomeric liner has a tapered portion located beneath said circumferential annular bead adjacent the junction between said liner and said extension.
Claim 6
Dependent Claim
26 words
A butterfly valve assembly according to claim 1 including an O-ring encircling said valve stem and disposed against the upper edge of said elastomeric liner extension.
Claim 7
Dependent Claim
27 words
A butterfly valve assembly according to claim 1 wherein a pair of spaced annular beads are molded integrally upon the inner surface of said elastomeric liner extension.
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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) | 1978-09-08 | 1979-03-10 | 1979-09-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-08 | 1983-03-10 | 1983-09-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-08 | 1987-03-10 | 1987-09-09 | $7700.00 | Window Closed / Lapsed |