US3552716A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Plug valve with a flexible port plate
Assignee: Walworth Co
•
Filing: 1969-06-03
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Granted: 1971-01-05
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Expires: 1989-06-03
Abstract
Abstract A tapered plug valve with thin flexible plates of metal or the like to seal against the plug, the plates being restrained against lateral or circumferential movement in the valve body by means of axial extensions inserted in the flow ports. A backing liner of elastomeric material seals the flexible port plates to the body and enables them to conform to the curvature of the tapered plug. A top closure with self-adjusting plug loading comprises a Belleville spring which is pressed by a loading ring against the top shoulder of the plug. Any leakage past the upstream port plate seal causes a pressure buildup in the valve housing which exerts an additional torsional force on the Belleville spring about the load ring to increase axial plug load until the upstream port is again sealed.
Inventors
- 👤 Pieter F Hoos
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 13:21
CPC Classifications
F; F16; F16K; F16K5/00; F16K5/02; F16K5/0257; F16K5/0271; F16K5/08; F16K5/14; F16K5/16; F16K5/162; F16K5/163
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
197 words
A plug valve comprising: a valve body having inlet and outlet flow ports and a body cavity disposed transversely of said ports; a plug in said body cavity having a flow passageway therethrough; at least one arcuate flexible seal plate of thin, strength material mounted in said body with an opening therein aligned with one of said flow ports to seal against said plug around said one flow port; a closed axial extension from the outer surface of said seal plate completely around the opening therein extending outward into said one flow port to restrain said plate against lateral motion; an axially extending recess in the wall of said body cavity around said one flow port accommodating said axial extension, the sides of said recess being tapered outward away from said body cavity; a thin sheet of elastomeric material interposed to seal between said seal plate and the wall of said body cavity and to accommodate flexural movements of said seal plate; portions of said thin sheet around said flow port extending into said axial recess and around the edge of said axial seal plate extension to seal between said extension and the wall of said recess.
Claim 2
Dependent Claim
197 words
A plug valve comprising: a valve body having inlet and outlet flow ports and a body cavity disposed transversely of said ports; a plug in said body cavity having a flow passageway therethrough; at least one arcuate flexible seal plate of thin, strength material mounted in said body with an opening therein aligned with one of said flow ports to seal against said plug around said one flow port; a closed axial extension from the outer surface of said seal plate completely around the opening therein extending outward into said one flow port to restrain said plate against lateral motion; an axially extending recess in the wall of said body cavity around said one flow port accommodating said axial extension, the sides of said recess being tapered outward away from said body cavity; a thin sheet of elastomeric material interposed to seal between said seal plate and the wall of said body cavity and to accommodate flexural movements of said seal plate; portions of said thin sheet around said flow port extending into said axial recess and around the edge of said axial seal plate extension to seal between said extension and the wall of said recess.
Claim 3
Dependent Claim
53 words
The plug valve defined by claim 1, wherein; said plug is free to move a limited amount in the direction of fluid flow in absence of said thin sheet, the edge of said axial extension being adapted to engage and seal around the bottom of said recess in the event of said movement.
Claim 4
Dependent Claim
27 words
The plug valve defined by claim 1, wherein; the lateral edges of said seal plate are curled radially outward into firm locking engagement with said resilient sheet.
Claim 5
Dependent Claim
27 words
The plug valve defined by claim 1, including; a thin coating of resilient material sprayed on the inner surface of said port plate around the port therein.
Claim 6
Dependent Claim
30 words
The plug valve defined by claim 1, including; a thin coating on areas of the inner surface of said seal plate of a material having a low coefficient of friction.
Claim 7
Dependent Claim
126 words
The plug valve defined by claim 1, wherein said plug and body cavity are of complementary Tapered configuration and including: a closure member secured to said valve body to cover said body cavity; a resilient diaphragm covered by said closure member and sealed around its outer edges to said valve body; a Belleville spring interposed between said diaphragm and said closure member; a loading ring acting approximately coaxial with and against said Belleville spring on a circle approximately midway between the inner and outer diameter thereof; and means connecting said loading ring and said closure member to force said loading ring against said Belleville spring and adjust the axial load on said plug with the inner circumferential edge of said Belleville spring firmly engaging said diaphragm.
Claim 8
Dependent Claim
64 words
The valve plug defined by claim 1 wherein: said plug and said body cavity are of complementary frustoconical configuration; and said seal plate when undeformed is on a conical surface of greater radii than radii of said plug at corresponding axial locations, whereby placement of said plate and plug deforms said plate to smaller radii and deforms lateral portions of said axial extension outward.
Claim 9
Dependent Claim
15 words
The plug valve defined by claim 1 including: lateral winglike extensions on said seal plate.
Claim 10
Dependent Claim
147 words
A plug valve comprising: a valve body having inlet and outlet flow ports; a tapered body cavity in said valve body transverse of said flow ports, a complementary tapered plug received in said body cavity; complementary sealing surfaces on said plug and on the wall of said body cavity; a closure member secured to said valve body to cover said body cavity; means sealing between said closure member and said valve body; a Belleville spring disposed between said closure member and said plug; a loading ring acting approximately coaxial with and against said Belleville spring on a circle approximately midway between the inner and outer diameter thereof; and means connecting said loading ring and said closure member to force said loading ring against said Belleville spring and adjust the axial load on said plug with the inner circumferential edge of said Belleville spring firmly pressing said plug.
Claim 11
Dependent Claim
147 words
A plug valve comprising: a valve body having inlet and outlet flow ports; a tapered body cavity in said valve body transverse of said flow ports, a complementary tapered plug received in said body cavity; complementary sealing surfaces on said plug and on the wall of said body cavity; a closure member secured to said valve body to cover said body cavity; means sealing between said closure member and said valve body; a Belleville spring disposed between said closure member and said plug; a loading ring acting approximately coaxial with and against said Belleville spring on a circle approximately midway between the inner and outer diameter thereof; and means connecting said loading ring and said closure member to force said loading ring against said Belleville spring and adjust the axial load on said plug with the inner circumferential edge of said Belleville spring firmly pressing said plug.
Claim 12
Dependent Claim
46 words
The plug valve defined by claim 9, wherein said sealing means comprises: a resilient diaphragm sealing around its outer edges between said closure member and said valve body; and inner portions of said diaphragm being interposed between said Belleville spring and said plug to seal therebetween.
Claim 13
Dependent Claim
29 words
The plug valve defined by claim 10, wherein; said Belleville spring provides full support for that portion of the resilient diaphragm which is not supported by 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) | 1974-01-04 | 1974-07-06 | 1975-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-04 | 1978-07-06 | 1979-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-04 | 1982-07-06 | 1983-01-05 | $7700.00 | Window Closed / Lapsed |