US3826309A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Well safety valve
Assignee: CAMCO INC US
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Filing: 1973-05-11
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Granted: 1974-07-30
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Expires: 1993-05-11
Abstract
Abstract A well safety valve for use in a well tubing having a valve for engaging an annular valve seat for opening and closing the valve and operated by a sliding tube telescopically movable in the body and positioned below the valve means. Upward movement of the tube opens the valve and downward movement of the tube closes the valve. Means normally biasing said tube upwardly for holding the valve open and piston means connected to the tube and in communication with the exterior of the valve for moving the tube downwardly for closing the valve on increase in pressure exteriorly of the valve. A flapper valve pivotally connected to the body below the valve seat and movable upwardly into engagement with the seat for closing the valve and movable downwardly away from the seat for opening the valve. The biasing means including a gas chamber having a seal on each side of the chamber between the chamber and the interior of the tubing, and a bleed port leading from the side of each seal remote from the chamber to exteriorly of the body for preventing tubing pressure entering the chamber and providing a fail safe operation of the biasing chamber.
Inventors
- 👤 G Tausch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 19:37
CPC Classifications
E; E21; E21B; E21B34/00; E21B34/06; E21B34/08; E21B2200/00; E21B2200/05; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7723; Y10T137/7728; Y10T137/773
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
156 words
A well safety valve for use in a well tube comprising, a body having an annular valve seat, valve means for engaging said seat for opening and closing said valve, a sliding tube telescopically movable in the body positioned below said valve means and movable through the valve for holding the valve open when the tube is in the upward position and downward movement of the tube closes said valve, means for biasing said tube upwardly for opening said valve, said biasing means includes a gas chamber, and including, a seal on each side of the chamber between the chamber and the interior of the tubing, and a bleed port leading from the side of each seal remote from said chamber and to the exterior of the body, piston means connected to the tube, and passageway means in communication between the piston and exteriorly of the body for moving the tube downwardly for closing said valve.
Claim 2
Dependent Claim
156 words
A well safety valve for use in a well tube comprising, a body having an annular valve seat, valve means for engaging said seat for opening and closing said valve, a sliding tube telescopically movable in the body positioned below said valve means and movable through the valve for holding the valve open when the tube is in the upward position and downward movement of the tube closes said valve, means for biasing said tube upwardly for opening said valve, said biasing means includes a gas chamber, and including, a seal on each side of the chamber between the chamber and the interior of the tubing, and a bleed port leading from the side of each seal remote from said chamber and to the exterior of the body, piston means connected to the tube, and passageway means in communication between the piston and exteriorly of the body for moving the tube downwardly for closing said valve.
Claim 3
Dependent Claim
183 words
A well safety valve for use in a well tubing positioned in a well casing comprising, a body having an annular valve seat, said body including connections for attachment in the well tubing, a flapper valve pivotally connected to the body below the seat and movable upwardly into engagement with the seat for closing the valve and movable downwardly away from the seat for opening the valve, a sliding tube telescopically movable in the body and through the seat and positioned below the valve, biasing means for moving the tube upwardly holding the flapper valve away from the seat, said biasing means includes a gas chamber, and including, a seal on each side of the chamber and the interior of the tubing, and a bleed port leading from the side of each seal remote from said chamber seals and to the exterior of the body, upwardly directed piston connected to the tube, passageway means in communication between the piston and the exterior of the body for applying tubing casing annulus pressure on the piston for moving the tube downwardly for closing the valve.
Claim 4
Dependent Claim
183 words
A well safety valve for use in a well tubing positioned in a well casing comprising, a body having an annular valve seat, said body including connections for attachment in the well tubing, a flapper valve pivotally connected to the body below the seat and movable upwardly into engagement with the seat for closing the valve and movable downwardly away from the seat for opening the valve, a sliding tube telescopically movable in the body and through the seat and positioned below the valve, biasing means for moving the tube upwardly holding the flapper valve away from the seat, said biasing means includes a gas chamber, and including, a seal on each side of the chamber and the interior of the tubing, and a bleed port leading from the side of each seal remote from said chamber seals and to the exterior of the body, upwardly directed piston connected to the tube, passageway means in communication between the piston and the exterior of the body for applying tubing casing annulus pressure on the piston for moving the tube downwardly for closing the valve.
Claim 5
Dependent Claim
173 words
A well safety valve for use in a well tubing positioned in a well casing comprising, a body having an annular valve seat, said body including threaded connections for attachment in the well tubing, a flapper valve pivotally connected to the body below the seat and movable upwardly into engagement with the seat for closing the valve and movable downwardly away from the seat for opening the valve, a sliding tube positioned below the valve and telescopically movable in the body and through the valve for holding the valve open when the tube is in the upward position and allowing the valve to close when the tube is moved downwardly, biasing means for yieldably holding the tube upwardly for holding the flapper valve away from the seat, an upwardly directed piston connected to the tube, and passageway means in communication between the piston and the exterior of the body and tubing whereby a predetermined increase in pressure in the tubing casing annulus on the piston moves the tube downwardly for closing the valve.
Claim 6
Dependent Claim
173 words
A well safety valve for use in a well tubing positioned in a well casing comprising, a body having an annular valve seat, said body including threaded connections for attachment in the well tubing, a flapper valve pivotally connected to the body below the seat and movable upwardly into engagement with the seat for closing the valve and movable downwardly away from the seat for opening the valve, a sliding tube positioned below the valve and telescopically movable in the body and through the valve for holding the valve open when the tube is in the upward position and allowing the valve to close when the tube is moved downwardly, biasing means for yieldably holding the tube upwardly for holding the flapper valve away from the seat, an upwardly directed piston connected to the tube, and passageway means in communication between the piston and the exterior of the body and tubing whereby a predetermined increase in pressure in the tubing casing annulus on the piston moves the tube downwardly for closing the valve.
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) | 1977-07-29 | 1978-01-28 | 1978-07-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-29 | 1982-01-28 | 1982-07-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-29 | 1986-01-28 | 1986-07-30 | $7700.00 | Window Closed / Lapsed |