US3747633A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic choke
Assignee: Baker Hughes Holdings LLC
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Filing: 1971-08-20
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Granted: 1973-07-24
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Expires: 1991-08-20
Abstract
Abstract A valving means for automatically restricting the flow of fluids through a flow conductor until undesirably high pressures occurring in the upstream end of the conductor return to normal. A primary valve stem closes with the advent of high pressure to force all flow through a small orifice choke. The primary valve stem is formed by a piston and is spring biased toward its seated position. Under normal conditions, the upstream pressure which acts on the front end of the piston is greater than the pressure communicated to the piston''s back end and the resulting pressure differential holds the valve open against the spring force. A second pressure differential acting across a bellows disposed between the piston''s back end and an external pressure area moves a control valve stem which regulates opening of a pressure outlet line extending between the back end of the piston and the downstream pressure area. When the pressure outlet line closes, a pressure inlet line extending between the upstream pressure area and the piston''s back end permits pressure at the latter location to increase until it equals the upstream pressure which then permits the spring to drive the piston against the valve seat to close the primary valve opening. The small choke orifice is included as a part of a removable insert so that it may be replaced without disassembly of the entire valve. Incompressible fluid is trapped within the area confined by the bellows when bellows foreshortening exceeds a predetermined amount to prevent further foreshortening which might otherwise cause bellows damage.
Inventors
- 👤 H Garrett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:27
CPC Classifications
F; F16; F16K; F16K17/00; F16K17/02; F16K17/04; F16K17/10; F16K17/105; F16K17/20; F16K17/22; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7758; Y10T137/7762; Y10T137/7764; Y10T137/7766; Y10T137/7767; Y10T137/7768
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
133 words
An automatic valve means for regulating the flow of fluids flowing in an upstream to a downstream direction through a fluid flow conduit comprising: a. primary valving means movable between open and closed positions for permitting fluid flow through a first flow passage means when said primary valving means is in open position and for terminating such flow when said primary valving means is in closed position; b. operator means connected with said primary valving means for automatically moving said primary valving means to closed position when the pressure in a first pressure area in said first flow passage means upstream of said valving means exceeds a predetermined maximum value; and c. second flow passage means for permitting fluid flow through said valve means when said primary valving means is in closed position.
Claim 2
Dependent Claim
133 words
An automatic valve means for regulating the flow of fluids flowing in an upstream to a downstream direction through a fluid flow conduit comprising: a. primary valving means movable between open and closed positions for permitting fluid flow through a first flow passage means when said primary valving means is in open position and for terminating such flow when said primary valving means is in closed position; b. operator means connected with said primary valving means for automatically moving said primary valving means to closed position when the pressure in a first pressure area in said first flow passage means upstream of said valving means exceeds a predetermined maximum value; and c. second flow passage means for permitting fluid flow through said valve means when said primary valving means is in closed position.
Claim 3
Dependent Claim
34 words
An automatic valve means as defined in claim 1 further including insert means removably carried in said valve means for forming a replaceable, wear resistant flow passage opening for said second flow passage means.
Claim 4
Dependent Claim
111 words
An automatic valve means as defined in claim 1 further including: a. biasing means tending to urge said primary valving means to closed position; and b. first pressure responsive control means operable in response to the pressure differential existing between said first pressure area and a second pressure area for maintaining said closure means in opened position against the force of said biasing means when the pressure in said second area is lower than the pressure in said first pressure area and for permitting said biasing means to move said closure means to closed position when the pressures in said first and second pressure areas are substantially equal to each other.
Claim 5
Dependent Claim
188 words
An automatic valve means as defined in claim 3 wherein: a. inlet pressure passage means connect between said second pressure area and said first pressure area for conveying pressure fluid between said first and second areas; b. outlet pressure passage means connect between said second pressure area and a third pressure area for conveying pressure fluid between said second and third areas whereby the pressure value within said second pressure area is determined by the pressure value of the fluid moving through said inlet and outlet pressure passage means; and including c. second pressure responsive control means operable in response to a control pressure differential between said second pressure area and a fourth pressure area to close said outlet pressure passage means when said control pressure diFferential exceeds a predetermined maximum value and for opening said outlet pressure passage means when said control pressure differential is below said predetermined maximum value whereby when said outlet pressure passage means is closed, the pressure in said second pressure area may increase to substantially the same value as the pressure in said first pressure area to close said primary valving means.
Claim 6
Dependent Claim
30 words
An automatic valve as defined in claim 4 further including adjustment means for adjusting the maximum valve of said control pressure differential at which said outlet pressure passage is closed.
Claim 7
Dependent Claim
35 words
An automatic valve as defined in claim 4 wherein: a. said third pressure area is within said flow conduit downstream of said valve means; and b. said fourth pressure area is opened to the atmosphere.
Claim 8
Dependent Claim
23 words
An automatic valve as defined in claim 4 wherein said second and fourth pressure areas are sealed from each other by bellows means.
Claim 9
Dependent Claim
133 words
An automatic valve as defined in claim 7 wherein: a. said bellows means partially enclose a bellows area having a bellows opening through which fluids may be moved into and out of said bellows area with movement of said bellows means; b. said bellows means includes bellows valve means operable on movement of said bellows means to open or close said bellows opening whereby fluids are confined in said bellows area when said bellows opening is closed; c. an incompressible fluid occupies all of the fluid containable space within said bellows area; and d. said bellows valve means is closed by movement of said bellows means beyond a predetermined maximum value in a given direction to confine said imcompressible fluid within said bellows area to prevent further bellows movement in the same direction.
Claim 10
Dependent Claim
524 words
An automatic valve means for regulating the flow of fluids flowing in an upstream to a downstream direction through a fluid flow conduit comprising: a. primary valving means movable between open and closed positions for permitting fluid flow through a first flow passage means when said primary valving means is in open position and for terminating such flow when said primary valving means is in closed position; b. operator means connected with said primary valving means for automatically moving said primary valving means to closed position when the pressure in a first pressure area in said first flow passage means upstream of said valving means exceeds a predetermined maximum value; c. biasing means tending to urge said primary valving means to closed position; d. first pressure responsive control means operable in response to the pressure differential existing between said first pressure area and a second pressure area for maintaining said closure means in opened position against the force of said biasing means when the pressure in said second pressure area is lower than the pressure in said first pressure area and for permitting said biasing means to move said closure means to closed position when the pressures in said first and second pressure areas are substantially equal to each other; e. inlet pressure passage means connecting between said second pressure area and said first pressure area for conveying pressure fluid between said first and second areas; f. outlet pressure passage means connecting between said second pressure area and a third pressure area for conveying pressure fluid between said second and third areas whereby the pressure value within said second pressure area is determined by the pressure value of the fluid moving through said inlet and outlet pressure passage means; g. second pressure responsive control means operable in response to a control pressure differential between said second pressure area and a fourth pressure area to close said outlet pressure passage means when said control pressure differential exceeds a predetermined maximum value and for opening said outlet pressure passage means when said control pressure differential is below said preDetermined maximum value whereby when said outlet pressure passage means is closed, the pressure in said second pressure area may increase substantially to the same value as the pressure in said first pressure area to close said primary valving means; h. bellows means sealing said second and fourth pressure areas from each other with said bellows means partially enclosing a bellows area having a bellows opening through which fluids may be moved into and out of said bellows area with movement of said bellows means; i. bellows valve means included with said bellows means and operable on movement of said bellows means to open or close said bellows opening whereby fluids are confined in said bellows area when said bellows opening is closed; and j. an incompressible fluid occupying all of the fluid containable space within said bellows area with said bellows valve means closed by movement of said bellows means beyond a predetermined maximum value in a given direction to confine said incompressible fluid within said bellows area to prevent further bellows movement in the same direction.
Claim 11
Dependent Claim
524 words
An automatic valve means for regulating the flow of fluids flowing in an upstream to a downstream direction through a fluid flow conduit comprising: a. primary valving means movable between open and closed positions for permitting fluid flow through a first flow passage means when said primary valving means is in open position and for terminating such flow when said primary valving means is in closed position; b. operator means connected with said primary valving means for automatically moving said primary valving means to closed position when the pressure in a first pressure area in said first flow passage means upstream of said valving means exceeds a predetermined maximum value; c. biasing means tending to urge said primary valving means to closed position; d. first pressure responsive control means operable in response to the pressure differential existing between said first pressure area and a second pressure area for maintaining said closure means in opened position against the force of said biasing means when the pressure in said second pressure area is lower than the pressure in said first pressure area and for permitting said biasing means to move said closure means to closed position when the pressures in said first and second pressure areas are substantially equal to each other; e. inlet pressure passage means connecting between said second pressure area and said first pressure area for conveying pressure fluid between said first and second areas; f. outlet pressure passage means connecting between said second pressure area and a third pressure area for conveying pressure fluid between said second and third areas whereby the pressure value within said second pressure area is determined by the pressure value of the fluid moving through said inlet and outlet pressure passage means; g. second pressure responsive control means operable in response to a control pressure differential between said second pressure area and a fourth pressure area to close said outlet pressure passage means when said control pressure differential exceeds a predetermined maximum value and for opening said outlet pressure passage means when said control pressure differential is below said preDetermined maximum value whereby when said outlet pressure passage means is closed, the pressure in said second pressure area may increase substantially to the same value as the pressure in said first pressure area to close said primary valving means; h. bellows means sealing said second and fourth pressure areas from each other with said bellows means partially enclosing a bellows area having a bellows opening through which fluids may be moved into and out of said bellows area with movement of said bellows means; i. bellows valve means included with said bellows means and operable on movement of said bellows means to open or close said bellows opening whereby fluids are confined in said bellows area when said bellows opening is closed; and j. an incompressible fluid occupying all of the fluid containable space within said bellows area with said bellows valve means closed by movement of said bellows means beyond a predetermined maximum value in a given direction to confine said incompressible fluid within said bellows area to prevent further bellows movement in the same direction.
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) | 1976-07-23 | 1977-01-22 | 1977-07-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-23 | 1981-01-22 | 1981-07-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-23 | 1985-01-22 | 1985-07-24 | $7700.00 | Window Closed / Lapsed |