US3734457A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pressure biased butterfly valve seal
Assignee: Dezurik Corp
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Filing: 1972-02-22
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Granted: 1973-05-22
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Expires: 1992-02-22
Abstract
Abstract A resilient seal ring is located in a stepped, annular groove in a valve body with a portion of the ring extending radially inwardly into the flow passageway and a peripheral web of the ring extending radially outwardly into the deeper portion of the groove. One or more metal hoops encircle axially extending shoulders on the ring to take up the primary hoop stresses imparted to the ring by the valve closure member. In the preferred embodiment the ring is made of a fluorinated hydrocarbon polymer and an annular spring engages one side of the web portion of the ring to provide a secondary seal with the groove. Pressure entering the groove urges the spring and the web portion axially into more positive engagement with one another and urges the ring radially into more positive engagement with the closure member.
Inventors
- 👤 W Roos
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 16:10
CPC Classifications
F; F16; F16K; F16K1/00; F16K1/16; F16K1/18; F16K1/22; F16K1/226; F16K1/228; F16K1/2285
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
320 words
A valve seal comprising, in combination, a valve body defining an axial flow passageway, a closure member pivotally mounted in the valve body to selectively block and unblock the passageway, said closure member having a peripheral sealing surface, annular groove means in the valve body communicating with the passageway and disposed in radial alignment with the peripheral sealing surface of the closure member when it is positioned to block the passageway, said groove means having a radially inner portion substantially wider than the radially outer portion thereof, a resilient sealing ring disposed in said groove means and projecting radially inwardly therefrom into the passageway with a primary sealing surface formed on the inner periphery thereof engageable by the peripheral sealing surface of the closure member when it is positioned to block the passageway, said sealing ring forming axially extending shoulder means and a circumferential web extending substantially radially outwardly from said axially extending shoulder means and into the radially outer portion of said groove means, said peripheral sealing surface of said closure member being in the form of a circular sector in axial cross-section with the radius of said sector decreasing from the axial center of said sealing surface to the edges thereof so as to provide a non-interfering lead-in to said primary sealing surface on the inner periphery of said sealing ring, and metal hoop means located on and engaging at least a portion of said shoulder means, said hoop means and sealing ring being dimensioned relative to each other and relative to the closure member so as to be circumferentially stretched when the primary sealing surface of the sealing ring is substantially coMpletely engaged by the peripheral sealing surface of the closure member and such that said hoop means returns said sealing ring to a substantially unstretched condition when the primary sealing surface thereof is not substantially completely engaged by the peripheral sealing surface of the closure member.
Claim 2
Dependent Claim
320 words
A valve seal comprising, in combination, a valve body defining an axial flow passageway, a closure member pivotally mounted in the valve body to selectively block and unblock the passageway, said closure member having a peripheral sealing surface, annular groove means in the valve body communicating with the passageway and disposed in radial alignment with the peripheral sealing surface of the closure member when it is positioned to block the passageway, said groove means having a radially inner portion substantially wider than the radially outer portion thereof, a resilient sealing ring disposed in said groove means and projecting radially inwardly therefrom into the passageway with a primary sealing surface formed on the inner periphery thereof engageable by the peripheral sealing surface of the closure member when it is positioned to block the passageway, said sealing ring forming axially extending shoulder means and a circumferential web extending substantially radially outwardly from said axially extending shoulder means and into the radially outer portion of said groove means, said peripheral sealing surface of said closure member being in the form of a circular sector in axial cross-section with the radius of said sector decreasing from the axial center of said sealing surface to the edges thereof so as to provide a non-interfering lead-in to said primary sealing surface on the inner periphery of said sealing ring, and metal hoop means located on and engaging at least a portion of said shoulder means, said hoop means and sealing ring being dimensioned relative to each other and relative to the closure member so as to be circumferentially stretched when the primary sealing surface of the sealing ring is substantially coMpletely engaged by the peripheral sealing surface of the closure member and such that said hoop means returns said sealing ring to a substantially unstretched condition when the primary sealing surface thereof is not substantially completely engaged by the peripheral sealing surface of the closure member.
Claim 3
Dependent Claim
44 words
A valve seal as defined in claim 1 wherein said hoop means is dimensioned to normally maintain said sealing ring in light hoop compression when the primary sealing surface thereof is not substantially completely engaged by the peripheral sealing surface of the closure member.
Claim 4
Dependent Claim
24 words
A valve seal as defined in claim 1 wherein said sealing ring is made of a fluorinated hydrocarbon polymer principally comprised of polymerized tetrafluoroethylene.
Claim 5
Dependent Claim
37 words
A valve seal as defined in claim 1 wherein said hoop means includes a pair of metal hoops each located on and engaging respective axially extending shoulder means formed on the outer periphery of said sealing ring.
Claim 6
Dependent Claim
23 words
A valve seal as defined in claim 4 wherein said circumferential web extends substantially radially outwardly from between said axially extending shoulder means.
Claim 7
Dependent Claim
26 words
A valve seal as defined in claim 4 wherein one of said axially extending shoulder means is formed on the outer periphery of said circumferential web.
Claim 8
Dependent Claim
63 words
A valve seal as defined in claim 1 wherein said hoop means and said sealing ring are dimensioned to have moving clearance in the radially inner portion of said groove means and said circumferential web is slidably received in the radially outer portion of said groove means whereby said sealing ring and hoop means are substantially self-centering with respect to said closure member.
Claim 9
Dependent Claim
77 words
A valve seal as defined in claim 1 wherein said resilient seal ring is formed relative to said groove means such that system pressure is introduced into said groove means from the high pressure side of said closure member and said pressure exerts a force between said hoop means and said groove means to urge said resilient seal ring radially inwardly into more firm engagement with said closure member when it is positioned to block said passageway.
Claim 10
Dependent Claim
49 words
A valve seal as defined in claim 1 wherein an annular spring means is disposed in the radially outer portion of said groove means between one side wall thereof and one face of said web for biasing said web axially against the other side wall of said groove means.
Claim 11
Dependent Claim
69 words
A valve seal as defined in claim 9 wherein said resilient seal ring is formed relative to said groove means such that system pressure is introduced into said groove means from the high pressure side of said closure member and said pressure urges said circumferential web and said annular spring means axially into more firm engagement with one another when said closure member is positioned to block said passageway.
Claim 12
Dependent Claim
38 words
A valve seal as defined in claim 9 wherein said annular spring means includes an outer circumferential portion substantially radially disposed and an inner circumferential portion inwardly inclined from the radial toward said one face of said web.
Claim 13
Dependent Claim
35 words
A valve seal as defined in claim 9 wherein the other face of said web is provided with channel means for communicating system pressure to and from the radially outermost portion of said groove means.
Claim 14
Dependent Claim
56 words
A valve seat as defined in claim 1 wherein said sealing ring forms at least one axially extending retaining shoulder on the side thereof, and said groove means includes a corresponding shoulder overlapping the retaining shoulder on the sealing ring on the radially inward side thereof so as to block inward radial movement of said ring.
Claim 15
Dependent Claim
59 words
A valve seat as defined in claim 1 wherein said sealing ring forms a pair of axially extending retaining shoulders on opposite sides thereof, and said groove means includes a corresponding pair of axially extending shoulders overlapping the shoulders on said sealing ring on the radially inward side thereof so as to block inward radial movement of said ring.
Claim 16
Dependent Claim
49 words
A valve seat as defineD in claim 1 wherein said shoulder means is formed by a groove extending around the entire circumference of said sealing ring and extending axially through a major portion of the axial thickness of said sealing ring, said hoop means being inserted within said groove.
Claim 17
Dependent Claim
72 words
A valve seat as defined in claim 15 wherein the radial width of the groove in said ring is substantially greater than the radial thickness of said hoop means, said ring being dimensioned to permit fluid passage between the open end of said groove and one side of said closure member so as to expose said shoulder means and hoop to the fluid pressure on said one side of said closure member.
Claim 18
Dependent Claim
113 words
A valve seat as defined in claim 15 wherein said radially outer portion of said groove means is offset in the axial direction to one side of the groove means, and the adjacent radially outermost surface of the wider inner portion of said groove means is spaced away from the adjacent surface of said sealing ring, said ring being dimensioned to permit fluid passage from the other side of said closure member to the space between said outermost surface of the inner portion of said groove means and the adjacent surface of said sealing ring so as to expose said ring to the fluid pressure on said other side of said closure member.
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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) | 1976-05-21 | 1976-11-20 | 1977-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-21 | 1980-11-20 | 1981-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-21 | 1984-11-20 | 1985-05-22 | $7700.00 | Window Closed / Lapsed |