Patent US3591133A successfully refreshed from Google Patents.
US3591133A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Butterfly valve
Assignee: Neles Jamesbury Inc
•
Filing: 1968-08-23
•
Granted: 1971-07-06
•
Expires: 1988-08-23
Abstract
Abstract An improved butterfly valve of the type wherein a disc mounted for rotation about a nondiametric axis and having a continuously convergent circumferential sealing surface which cooperates with a wall-mounted annular flexible seat is disclosed. The inwardly projecting nature of the flexible seat subjects it to highly erosive forces when fluid is throttled between it and the disc when the disc is opened to a throttling position, i.e. approximately 15* from the closed position or greater. To protect the seat from such erosive forces, the rigid wall of the fluid flow channel is projected inwardly on both sides of the seat to provide a far more erosion-resistant surface for throttling operation. These same inward projections can also be employed to provide a scraping lip which will remove solids buildup from the sealing surface of the disc as it is rotated toward the seat. A manner of affixing the disc to the shaft without providing a leak path across the disc and whereby the forces imposed by fluid pressure upon the disc are transmitted directly to the shaft is also disclosed. This entails passing the shaft through a shaft bore in an integrally formed gudgeon in said disc and passing tapered pins parallel to the surfaces of the disc through the gudgeon and shaft in such a manner that a majority of, but not the entire circumference of, the tapered pin lies within the circumference of the shaft. Rotation of the disc beyond the desired one-quarter turn from the fully closed to the fully open position and displacement of the disc along the direction of the axis of the shaft are prevented by lugs extending into the fluid flow channel from the valve body.
Inventors
- 👤 Michael E Miles
- 👤 James F Donnelly
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:11
CPC Classifications
F; F16; F16K; F16K1/00; F16K1/16; F16K1/18; F16K1/22
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
466 words
A butterfly valve comprising a valve body of rigid material defining a circular cross-sectional fluid flow channel therethrough, an annular seat affixed by the radially outwardly portion thereof in said valve body to circumscribe said flow channel, said seat having a flexible radially inwardly portion protruding into said flow channel, a shaft aligned nondiametrically across said flow channel at a point axially displaced along said flow channel from said annular flexible seat, a valve disc mounted for rotation about the axis of said shaft, the circumferential surface of said disc constituting a segment of a continuous geometric surface converging at a point on the axis of said flow channel, said surface constituting a sealing surface adapted to cooperate with said annular seat, the radially inwardly portion of said annular flexible seat having an annular sealing surface adapted to cooperate with said circumferential sealing surface on said disc to block flow through said channel when said disc is rotated into the closed position perpendicular to the axis of said flow channel, another annular surface of said inwardly portion of said annular flexible seat, disposed noncolinearly to said annular sealing surface thereof, exposed to the fluid in said flow channel and adapted to augment the sealing effectiveness of said seat against said disc by the action of fluid pressure, said valve effectively controlling the flow of fluid therethrough at any desired proportion not greater than unity of the fluid pressure prevailing upstream thereof by rotation of said disc about the nondiametric axis to any flowcontrolling position at least about 15* from said closed position, an annular rigid-surfaced ring element axially displaced along said flow channel from said shaft and from said annular seat, but proximate to the latter, the annular opening thereof projecting radially inward to an extent short of intersecting with the locus of rotation of said disc but sufficient to assure that, when said disc is in said flow-controlling position, every point on said circumferential sealing surface on that portion of the disc rotated in, the axial direction toward said ring element is closer to said ring element than to any portion of said flexible seat, and another said ring element being positioned on the opposite side of said seat from the first said ring element, the respective extremities of said shaft being mounted in narrow-walled sleeve bearings inserted into cavities in said valve body, the materials from which said sleeve bearings and said flexible portion of said annular seat are formed having a heat-destruction temperature considerably lower than that of said valve body and said disc, the wall tHickness of said sleeve bearings being substantially the same as the clearance between the locus of rotation of said disc and said ring elements, whereby substantial sealing effectiveness is retained by said valve despite heat damage thereto.
Claim 2
Dependent Claim
466 words
A butterfly valve comprising a valve body of rigid material defining a circular cross-sectional fluid flow channel therethrough, an annular seat affixed by the radially outwardly portion thereof in said valve body to circumscribe said flow channel, said seat having a flexible radially inwardly portion protruding into said flow channel, a shaft aligned nondiametrically across said flow channel at a point axially displaced along said flow channel from said annular flexible seat, a valve disc mounted for rotation about the axis of said shaft, the circumferential surface of said disc constituting a segment of a continuous geometric surface converging at a point on the axis of said flow channel, said surface constituting a sealing surface adapted to cooperate with said annular seat, the radially inwardly portion of said annular flexible seat having an annular sealing surface adapted to cooperate with said circumferential sealing surface on said disc to block flow through said channel when said disc is rotated into the closed position perpendicular to the axis of said flow channel, another annular surface of said inwardly portion of said annular flexible seat, disposed noncolinearly to said annular sealing surface thereof, exposed to the fluid in said flow channel and adapted to augment the sealing effectiveness of said seat against said disc by the action of fluid pressure, said valve effectively controlling the flow of fluid therethrough at any desired proportion not greater than unity of the fluid pressure prevailing upstream thereof by rotation of said disc about the nondiametric axis to any flowcontrolling position at least about 15* from said closed position, an annular rigid-surfaced ring element axially displaced along said flow channel from said shaft and from said annular seat, but proximate to the latter, the annular opening thereof projecting radially inward to an extent short of intersecting with the locus of rotation of said disc but sufficient to assure that, when said disc is in said flow-controlling position, every point on said circumferential sealing surface on that portion of the disc rotated in, the axial direction toward said ring element is closer to said ring element than to any portion of said flexible seat, and another said ring element being positioned on the opposite side of said seat from the first said ring element, the respective extremities of said shaft being mounted in narrow-walled sleeve bearings inserted into cavities in said valve body, the materials from which said sleeve bearings and said flexible portion of said annular seat are formed having a heat-destruction temperature considerably lower than that of said valve body and said disc, the wall tHickness of said sleeve bearings being substantially the same as the clearance between the locus of rotation of said disc and said ring elements, whereby substantial sealing effectiveness is retained by said valve despite heat damage thereto.
Claim 3
Dependent Claim
458 words
A butterfly valve comprising a valve body of rigid material defining a circular cross-sectional fluid flow channel therethrough, an annular seat affixed by the radially outwardly portion thereof in said valve body to circumscribe said flow channel, said seat having a flexible radially inwardly portion protruding into said flow channel, a shaft aligned nondiametrically across said flow channel at a point axially displaced along said flow channel from said annular flexible seat, a valve disc mounted for rotation about the axis of said shaft, the circumferential surface of said disc constituting a segment of a continuous geometric surface converging at a point on the axis of said flow channel, said surface constituting a sealing surface adapted to cooperate with said annular seat, the radially inwardly portion of said annular flexible seat having an annular sealing surface adapted to cooperate with said circumferential sealing surface on said disc to block flow through said channel when said disc is rotated into the closed position perpendicular to the axis of said flow channel, another annular surface of said inwardly portion of said annular flexible seat, disposed noncolinearly to said annular sealing surface thereof, exposed to the fluid in said flow channel and adapted to augment the sealing effectiveness of said seat against said disc by the action of fluid pressure, said valve effectively controlling the flow of fluid therethrough at any desired proportion not greater than unity of the fluid pressure prevailing upstream thereof by rotation of said disc about the nondiametric axis to any flow-controlling position at least about 15* from said closed position, an annular rigid-surfaced ring element axially displaced along said flow channel from said shaft and from said annular seat, but proximate to the latter, the annular opening thereof projecting radially inward to an extent short of intersecting with the locus of rotation of said disc but sufficient to assure that, when said disc is in said flow-controlling position, every point on said circumferential sealing surface on that portion of the disc rotated in the axial direction toward said ring element is closer to said ring element than to any portion of said flexible seat, a plurality of lugs, projecting into said fluid channel from said valve body, to prevent the rotation of said disc substantially beyond a quarter-turn rotation from the fully closed position to the fully open position, whereby avoidance of damage to the flexible annular seat caused by rotation of the nondiametrically mounted disc in the wrong direction is assured, said lugs being positioned to interfere with the displacement of said disc along the direction of the axis of said shaft, thereby assuring avoidance of damage to the annular flexible seat caused by seating of the disc when improperly positioned along the said direction.
Claim 4
Dependent Claim
458 words
A butterfly valve comprising a valve body of rigid material defining a circular cross-sectional fluid flow channel therethrough, an annular seat affixed by the radially outwardly portion thereof in said valve body to circumscribe said flow channel, said seat having a flexible radially inwardly portion protruding into said flow channel, a shaft aligned nondiametrically across said flow channel at a point axially displaced along said flow channel from said annular flexible seat, a valve disc mounted for rotation about the axis of said shaft, the circumferential surface of said disc constituting a segment of a continuous geometric surface converging at a point on the axis of said flow channel, said surface constituting a sealing surface adapted to cooperate with said annular seat, the radially inwardly portion of said annular flexible seat having an annular sealing surface adapted to cooperate with said circumferential sealing surface on said disc to block flow through said channel when said disc is rotated into the closed position perpendicular to the axis of said flow channel, another annular surface of said inwardly portion of said annular flexible seat, disposed noncolinearly to said annular sealing surface thereof, exposed to the fluid in said flow channel and adapted to augment the sealing effectiveness of said seat against said disc by the action of fluid pressure, said valve effectively controlling the flow of fluid therethrough at any desired proportion not greater than unity of the fluid pressure prevailing upstream thereof by rotation of said disc about the nondiametric axis to any flow-controlling position at least about 15* from said closed position, an annular rigid-surfaced ring element axially displaced along said flow channel from said shaft and from said annular seat, but proximate to the latter, the annular opening thereof projecting radially inward to an extent short of intersecting with the locus of rotation of said disc but sufficient to assure that, when said disc is in said flow-controlling position, every point on said circumferential sealing surface on that portion of the disc rotated in the axial direction toward said ring element is closer to said ring element than to any portion of said flexible seat, a plurality of lugs, projecting into said fluid channel from said valve body, to prevent the rotation of said disc substantially beyond a quarter-turn rotation from the fully closed position to the fully open position, whereby avoidance of damage to the flexible annular seat caused by rotation of the nondiametrically mounted disc in the wrong direction is assured, said lugs being positioned to interfere with the displacement of said disc along the direction of the axis of said shaft, thereby assuring avoidance of damage to the annular flexible seat caused by seating of the disc when improperly positioned along the said direction.
References Cited (Backward Citations)
US688860A
Cited
US1905684A
Cited
US2586927A
Cited
US2893682A
Cited
US2980388A
Cited
US3304050A
Cited
US3288163A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-07-05 | 1975-01-04 | 1975-07-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-05 | 1979-01-04 | 1979-07-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-05 | 1983-01-04 | 1983-07-06 | $7700.00 | Window Closed / Lapsed |