Patent US4562854A successfully refreshed from Google Patents.
US4562854A
Expired / Lapsed
US
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Piston actuated chemical injection valve
Assignee: Camco International Inc
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Filing: 1984-09-27
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Granted: 1986-01-07
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Expires: 2004-09-27
Abstract
Abstract An injection valve for injecting chemicals into a well which is actuated by a piston having an upwardly and a downwardly directed metal cup seal with a resilient seal therebetween and a gas pressure charge above the piston acting to close the injection valve. Oil may be provided in the body between the gas charge and the piston for acting as a barrier. The gas charge may be placed in a closed gas container having a rupturable portion with a piercing means for opening the container. The container may include oil.
Inventors
- 👤 Ronald E. Pringle
- 👤 Arthur J. Morris
- 👤 John J. Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 21:42
CPC Classifications
E; E21; E21B; E21B34/00; E21B34/06; E21B34/063; E21B41/00; E21B41/02; Y; Y10; Y10T; Y10T137/00; Y10T137/2931; Y10T137/2934
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
128 words
In an injection valve for injecting chemicals into a well having a body with spaced seal means on the exterior of the body for sealing in a well conduit, said body including an inlet port between the seal means for receiving chemicals and a passageway leading from the inlet port to an outlet port, and a valve seat and valve element positioned in the passageway, the improvement of an operating mechanism comprising, a piston in the body above said inlet port connected to the valve element, said piston including an upwardly directed metal cup seal, a downwardly directed metal cup seal, and a gas pressure charge in said body above said piston acting on the piston in a direction to close said valve element on said valve seat.
Claim 2
Dependent Claim
128 words
In an injection valve for injecting chemicals into a well having a body with spaced seal means on the exterior of the body for sealing in a well conduit, said body including an inlet port between the seal means for receiving chemicals and a passageway leading from the inlet port to an outlet port, and a valve seat and valve element positioned in the passageway, the improvement of an operating mechanism comprising, a piston in the body above said inlet port connected to the valve element, said piston including an upwardly directed metal cup seal, a downwardly directed metal cup seal, and a gas pressure charge in said body above said piston acting on the piston in a direction to close said valve element on said valve seat.
Claim 3
Dependent Claim
13 words
The apparatus of claim 1 including, a resilient seal between the metal seals.
Claim 4
Dependent Claim
29 words
The apparatus of claim 1 including, oil in the body between the gas charge and said piston for acting as a barrier between the gas charge and said piston.
Claim 5
Dependent Claim
39 words
The apparatus of claim 1 including, a closed gas container positioned in the body above the piston containing the gas pressure charge, said container including a rupturable portion, and piercing means adjacent said rupturable portion for opening said container.
Claim 6
Dependent Claim
17 words
The apparatus of claim 4 wherein the piercing means is positioned between the container and said piston.
Claim 7
Dependent Claim
23 words
The apparatus of claim 4 including, biasing means between the container and said piercing means for initially preventing the container from being opened.
Claim 8
Dependent Claim
10 words
The apparatus of claim 4 wherein the container includes oil.
Claim 9
Dependent Claim
15 words
The apparatus of claim 4 wherein oil is provided in the body above the piston.
Claim 10
Dependent Claim
23 words
The apparatus of claim 4 wherein the container is positioned in a cylinder in the body which is sealess except for the piston.
Claim 11
Dependent Claim
163 words
In an injection valve for injecting chemicals into a well having a body with spaced seal means on the exterior of the body for sealing in a well conduit, said body including an inlet port between the seal means for receiving chemicals and a passageway leading from the inlet port to an outlet port, and a valve seat and valve element positioned in the passageway, the improvement of an operating mechanism comprising, a piston in the body above said inlet port connected to the valve element, said piston including an upwardly directed metal cup seal, and a downwardly directed metal cup seal, and a resilient seal between the metal seals, a gas pressure charge in said body above said piston acting on the piston in a direction to close said valve element on said valve seat, and lubricating and sealing means in the body between the gas charge and said piston for acting as a barrier between the gas charge and said piston.
Claim 12
Dependent Claim
163 words
In an injection valve for injecting chemicals into a well having a body with spaced seal means on the exterior of the body for sealing in a well conduit, said body including an inlet port between the seal means for receiving chemicals and a passageway leading from the inlet port to an outlet port, and a valve seat and valve element positioned in the passageway, the improvement of an operating mechanism comprising, a piston in the body above said inlet port connected to the valve element, said piston including an upwardly directed metal cup seal, and a downwardly directed metal cup seal, and a resilient seal between the metal seals, a gas pressure charge in said body above said piston acting on the piston in a direction to close said valve element on said valve seat, and lubricating and sealing means in the body between the gas charge and said piston for acting as a barrier between the gas charge and said piston.
Claim 13
Dependent Claim
123 words
In an injection valve for injecting chemicals into a well having a body with spaced seal means on the exterior of the body for sealing in a well conduit, said body including an inlet port between the seal means for receiving chemicals and a passageway leading from the inlet port to an outlet port, and a valve seat and valve element positioned in the passageway, the improvement of an operating mechanism comprising, pressure responsive means in the body above said inlet port connected to the valve element, and a closed gas container positioned in the body above the pressure responsive means containing the gas pressure charge, said container including a rupturable portion, and piercing means adjacent said rupturable portion for opening said container.
Claim 14
Dependent Claim
123 words
In an injection valve for injecting chemicals into a well having a body with spaced seal means on the exterior of the body for sealing in a well conduit, said body including an inlet port between the seal means for receiving chemicals and a passageway leading from the inlet port to an outlet port, and a valve seat and valve element positioned in the passageway, the improvement of an operating mechanism comprising, pressure responsive means in the body above said inlet port connected to the valve element, and a closed gas container positioned in the body above the pressure responsive means containing the gas pressure charge, said container including a rupturable portion, and piercing means adjacent said rupturable portion for opening said container.
Claim 15
Dependent Claim
19 words
The apparatus of claim 11 wherein the piercing means is positioned between the container and the pressure responsive means.
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) | 1989-01-06 | 1989-07-08 | 1990-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-01-06 | 1993-07-08 | 1994-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-01-06 | 1997-07-08 | 1998-01-07 | $7700.00 | Window Closed / Lapsed |