Patent US3850191A successfully refreshed from Google Patents.
US3850191A
Expired / Lapsed
US
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Check valve assembly
Assignee: Baker Hughes Holdings LLC
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Filing: 1973-01-09
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Granted: 1974-11-26
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Expires: 1993-01-09
Abstract
Abstract A check valve assembly for use in a drill string to prevent reverse flow of drilling fluid through the string while permitting such fluid to be pumped downwardly through the well under normal conditions. The assembly includes: a valve body; a ball valve member, normally located out of the flow path in a side recess; a valve seat located above the valve member and means for controlling the rate of reverse flow of fluid required to move the valve member out of the side recess and against the valve seat.
Inventors
- 👤 C Brown
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 06:48
CPC Classifications
F; F16; F16K; F16K17/00; F16K17/20; F16K17/22; F16K17/24; F16K17/28; F16K17/285; E; E21; E21B; E21B21/00; E21B21/10; F16K15/00; F16K15/02; F16K15/04; Y; Y10; Y10T; Y10T137/00; Y10T137/5109; Y10T137/5283; Y10T137/7722; Y10T137/7723; Y10T137/7726; Y10T137/7727; Y10T137/7837; Y10T137/7869; Y10T137/7871; Y10T137/7873
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
205 words
A check valve assembly for permitting unrestricted flow in one direction and limited flow in the reverse direction comprising: a. a valve body, having walls the exterior of which are cylindrical and substantially uniform in diameter throughout the length of said valve body, said walls surrounding a longitudinal flowbore comprising first and third concentric sections connected by a second concentric section of restricted diameter; b. seat means carried by said valve body at one end of said third flowbore section; c. recess means in said valve body walls communicating with said flowbore near the junction of said second and third flowbore sections; d. ball closure means carried in said recess means out of said flowbore but movable into said flowbore for sealing engagement with said seat means, in response to a predetermined rate of reverse flow through said check valve assembly, to block reverse flow of fluids through said check valve assembly; and e. equalizing passage means in said valve providing fluid communication between said recess means and said first flowbore section, said equalizing passage being provided with replaceable orifice means, changing of which regulates the reverse flow rate to which said ball closure member is responsive for blocking flow through said check valve assembly.
Claim 2
Dependent Claim
205 words
A check valve assembly for permitting unrestricted flow in one direction and limited flow in the reverse direction comprising: a. a valve body, having walls the exterior of which are cylindrical and substantially uniform in diameter throughout the length of said valve body, said walls surrounding a longitudinal flowbore comprising first and third concentric sections connected by a second concentric section of restricted diameter; b. seat means carried by said valve body at one end of said third flowbore section; c. recess means in said valve body walls communicating with said flowbore near the junction of said second and third flowbore sections; d. ball closure means carried in said recess means out of said flowbore but movable into said flowbore for sealing engagement with said seat means, in response to a predetermined rate of reverse flow through said check valve assembly, to block reverse flow of fluids through said check valve assembly; and e. equalizing passage means in said valve providing fluid communication between said recess means and said first flowbore section, said equalizing passage being provided with replaceable orifice means, changing of which regulates the reverse flow rate to which said ball closure member is responsive for blocking flow through said check valve assembly.
Claim 3
Dependent Claim
28 words
A check valve assembly as set forth in claim 1 in which said first flowbore section is frusto-conical, converging toward said second and third sections, which are cylindrical.
Claim 4
Dependent Claim
57 words
A check valve assembly as set forth in claim 1 in which said recess means is a cylindrical hole of a diameter slightly larger than the diameter of said ball closure member and whose axis intersects the axis of said flowbore at an inclined angle so that said cylindrical hole is inclined toward said third flowbore section.
Claim 5
Dependent Claim
48 words
A check valve assembly as set forth in claim 1 in which said first, second and third flowbore sections are carried in a tubular insert disposed in a surrounding cylindrical section of said flowbore for removal through the end of said valve body adjacent said first flowbore section.
Claim 6
Dependent Claim
39 words
A check valve assembly as set forth in claim 4 in which said seat means is attached to said tubular insert permitting replacement of said seat means on removal of said insert from said surrounding section of said flowbore.
Claim 7
Dependent Claim
47 words
A check valve assembly as set forth in claim 1 in which said valve body is provided with an access port through which said orifice means may be externally removed from said check valve assembly, said access port communicating with said equalizing passage through said recess means.
Claim 8
Dependent Claim
42 words
A check valve assembly as set forth in claim 6 in which said access port is sealingly closed by plug means, said plug means projecting into said recess means for limiting the movement of said ball closure means in said recess means.
Claim 9
Dependent Claim
42 words
A check valve assembly as set forth in claim 1 comprising a sleeve member surrounding said valve body and retained thereon by retainer means, said sleeve member being removable on removal of said retainer means to permit access to said recess means.
Claim 10
Dependent Claim
51 words
A check valve assembly as set forth in claim 8 in which said orifice means is replaceable through said recess means on the removal of said sleeve member, for controlling the reverse flow rate to which said ball closure member is responsive for blocking reverse flow through said check valve assembly.
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) | 1977-11-25 | 1978-05-27 | 1978-11-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-25 | 1982-05-27 | 1982-11-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-25 | 1986-05-27 | 1986-11-26 | $7700.00 | Window Closed / Lapsed |