US3845784A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Float valve for drill strings
Assignee: Jackson Memorial Hospital
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Filing: 1971-03-30
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Granted: 1974-11-05
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Expires: 1991-03-30
Abstract
Abstract A float valve for a string of well drilling pipe, the valve being disposed in a sub above the drill bit and including a downwardly facing annular seat engageable by an upwardly closing valve head, the head having non-circular opening in its underside into which extends a correspondingly non-circular guide stem projecting upwardly from a spider support, a spring encircling the stem and acting upwardly on the valve head.
Inventors
- 👤 W Sullivan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 23:07
CPC Classifications
F; F16; F16K; F16K15/00; F16K15/02; F16K15/06; F16K15/063; E; E21; E21B; E21B21/00; E21B21/10; F16K2200/00; F16K2200/30; F16K2200/303; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7837; Y10T137/7854; Y10T137/7904; Y10T137/7922; Y10T137/7923; Y10T137/7929; Y10T137/7935
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
221 words
In a drill pipe float valve assembly having a valve body provided with portions adapted to be engaged in the bore of a drill dollar sub, an upwardly tapered valve seat in said body, a flow passage circumscribed by said seat, a valve head below said seat and having an axial cavity in one end and a valve surface on the other end complementally engageable with said valve seat, said valve head being reciprocable in said body between a closed position whereat said surface is engaged with said seat and an open position displaced downwardly from said seat, a valve stem extending into said cavity and supporting said head for slidable reciprocation thereon, a spring disposed about said stem and action on said head to bias the same into said closed position, and a spider supported in said body and retained in place therein, said spider mounting said valve stem, said valve head being movable from said closed position to said open position in response to downward flow of drilling fluid through said flow passage, the improvement wherein said stem and said cavity are of corresponding non-circular cross-section to prevent spinning of said valve head on said valve stem when said valve head is moved to said open position in response to downward flow of drilling fluid through said flow passage.
Claim 2
Dependent Claim
221 words
In a drill pipe float valve assembly having a valve body provided with portions adapted to be engaged in the bore of a drill dollar sub, an upwardly tapered valve seat in said body, a flow passage circumscribed by said seat, a valve head below said seat and having an axial cavity in one end and a valve surface on the other end complementally engageable with said valve seat, said valve head being reciprocable in said body between a closed position whereat said surface is engaged with said seat and an open position displaced downwardly from said seat, a valve stem extending into said cavity and supporting said head for slidable reciprocation thereon, a spring disposed about said stem and action on said head to bias the same into said closed position, and a spider supported in said body and retained in place therein, said spider mounting said valve stem, said valve head being movable from said closed position to said open position in response to downward flow of drilling fluid through said flow passage, the improvement wherein said stem and said cavity are of corresponding non-circular cross-section to prevent spinning of said valve head on said valve stem when said valve head is moved to said open position in response to downward flow of drilling fluid through said flow passage.
Claim 3
Dependent Claim
19 words
A drill pipe float valve assembly as defined in claim 1, wherein said stem and said spider are integral.
Claim 4
Dependent Claim
76 words
A drill pipe float valve assembly as defined in claim 1, wherein said flow passage is cylindrical, and including a hollow sleeve extending from said head into said flow passage, said sleeve having a radially opening port therein that is closed by the wall of said cylindrical flow passage when said valve head is in said closed position, and that is open for the flow of fluid therethrough when said head is in said open position.
Claim 5
Dependent Claim
21 words
A drill pipe float valve assembly as defined in claim 1, wherein said cavity and said stem are square in cross-section.
Claim 6
Dependent Claim
43 words
A drill pipe float valve assembly as defined in claim 1, wherein said head has a skirt depending therefrom and encircling said stem and said spring for the full length thereof to protect the same when said head is in said open position.
Claim 7
Dependent Claim
29 words
A drill pipe float valve assembly as defined in claim 1, wherein said stem and said spider are integral, and including means removably supporting said spider in said body.
Claim 8
Dependent Claim
63 words
A drill pipe float valve assembly as defined in claim 1 wherein said stem and said spider are integral, and including means removably supporting said spider in said body, and said head is provided with a skirt depending therefrom and encircling said stem and said spring for the full length thereof to protect the same when said head is in said open position.
References Cited (Backward Citations)
US2725076A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-11-04 | 1978-05-06 | 1978-11-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-04 | 1982-05-06 | 1982-11-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-04 | 1986-05-06 | 1986-11-05 | $7700.00 | Window Closed / Lapsed |