US3726503A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pressure seal for butterfly valves
Assignee: Henry Pratt Co LLC
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Filing: 1971-10-20
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Granted: 1973-04-10
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Expires: 1991-10-20
Abstract
Abstract A butterfly valve embodying an improved pressure seal. The valve includes a valve body having a fluid passage in which is a valve disc journaled for rotation between open and closed positions. A two member seal is arranged to contact the valve disc when the latter is in the closed position and the two members of the seal are constructed so that fluid under pressure may pass between an interface of the two members to the radially outermost side thereof to drive disc engaging, sealing noses of each of the members into firm sealing engagement with the disc.
Inventors
- 👤 D Fawkes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 01:03
CPC Classifications
F; F16; F16K; F16K1/00; F16K1/16; F16K1/18; F16K1/22; F16K1/226; F16K1/228; F16K1/2285
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
213 words
A butterfly valve construction comprising: a valve body having a fluid passage extending therethrough; a valve disc journaled within said passage for rotation between open and closed positions; and sealing means within said body about the periphery of said passage for sealingly engaging the periphery of said disc when said disc is in said closed position, said sealing means comprising a pair of flexible members disposed in side-by-side relationship and each including a nose portion located inwardly of the periphery of said passage for sealingly engaging the periphery of said disc, a body of set plastic material at least partially radially outwardly of said flexible members firmly locating said members in a position to sealingly engage said disc when said disc is in said closed position, at least a portion of the outermost peripheral surface of said members being free to move inwardly and away from said body of set plastic whereby fluid under pressure may flow through the interface between said members to the interface of said outermost peripheral surfaces and said body of set plastic material to exert pressure against said members to urge the nose of at least one of said members into firm sealing engagement with the periphery of said disc when said disc is in said closed position.
Claim 2
Dependent Claim
213 words
A butterfly valve construction comprising: a valve body having a fluid passage extending therethrough; a valve disc journaled within said passage for rotation between open and closed positions; and sealing means within said body about the periphery of said passage for sealingly engaging the periphery of said disc when said disc is in said closed position, said sealing means comprising a pair of flexible members disposed in side-by-side relationship and each including a nose portion located inwardly of the periphery of said passage for sealingly engaging the periphery of said disc, a body of set plastic material at least partially radially outwardly of said flexible members firmly locating said members in a position to sealingly engage said disc when said disc is in said closed position, at least a portion of the outermost peripheral surface of said members being free to move inwardly and away from said body of set plastic whereby fluid under pressure may flow through the interface between said members to the interface of said outermost peripheral surfaces and said body of set plastic material to exert pressure against said members to urge the nose of at least one of said members into firm sealing engagement with the periphery of said disc when said disc is in said closed position.
Claim 3
Dependent Claim
33 words
The valve of claim 1 wherein said body of set plastic material is formed of an epoxy resin cast in situ, and said outermost peripheral surfaces are coated with a mold release agent.
Claim 4
Dependent Claim
54 words
The valve of claim 1 wherein each of said members includes a peripheral groove in the side thereof remote from the other of said members, said valve body includes an annular groove radially outwardly of said passage and opening on said passage, said annular groove receiving said members and said set body of plastic.
Claim 5
Dependent Claim
27 words
The valve of claim 3 wherein said set body of plastic is cast in situ and said outermost peripheral surfaces are coated with a mold release agent.
Claim 6
Dependent Claim
168 words
A butterfly valve construction comprising: a valve body having a fluid passage extending therethrough; an annular groove within said valve body and opening about said fluid passage; a valve disc journaled within said passage for rotation between open and closed positions; and sealing means within said annular groove about the periphery of said passage for sealingly engaging the periphery of said disc when said disc is in said closed position, said sealing means comprising a pair of abutting flexible members, both within said groove, each having a portion extending from the groove inwardly into said passage to sealingly engage the periphery of said disc when said disc is in said closed position, and each further having a pressure responsive surface opposite said portion and adapted to be subjected to fluid under pressure in a conduit with which said valve may be used, said fluid under pressure flowing through the interface of said flexible members to said pressure responsive surfaces; and means retaining said flexible members within said groove.
Claim 7
Dependent Claim
168 words
A butterfly valve construction comprising: a valve body having a fluid passage extending therethrough; an annular groove within said valve body and opening about said fluid passage; a valve disc journaled within said passage for rotation between open and closed positions; and sealing means within said annular groove about the periphery of said passage for sealingly engaging the periphery of said disc when said disc is in said closed position, said sealing means comprising a pair of abutting flexible members, both within said groove, each having a portion extending from the groove inwardly into said passage to sealingly engage the periphery of said disc when said disc is in said closed position, and each further having a pressure responsive surface opposite said portion and adapted to be subjected to fluid under pressure in a conduit with which said valve may be used, said fluid under pressure flowing through the interface of said flexible members to said pressure responsive surfaces; and means retaining said flexible members within said groove.
Claim 8
Dependent Claim
67 words
A butterfly valve according to claim 5 wherein each of said flexible members includes a groove on a side thereof intermediate said pressure responsive surface and said portion, said flexible members being located within said annular groove such that said side grooves are oppositely located from each other, said retaining means including means fixed to said valve body and within the side grooves of the flexible members.
Claim 9
Dependent Claim
37 words
A butterfly valve construction according to claim 5 wherein said retaining means comprises a body of set plastic within said annular groove, said pressure responsive surfaces being free for movement relative to said set body of plastic.
Claim 10
Dependent Claim
21 words
A butterfly valve construction according to claim 7 wherein said pressure responsive surfaces include a coating of a mold release agent.
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 |