Patent US3766940A successfully refreshed from Google Patents.
US3766940A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pressure latching check valve
Assignee: ExxonMobil Upstream Research Co
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Filing: 1971-08-25
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Granted: 1973-10-23
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Expires: 1991-08-25
Abstract
Abstract A check valve contains two chambers connected together by a restricted flow passageway and a valve element movable from one of the chambers to the other chamber through the flow passageway in response to fluid pressure changes. At fluid flow velocities below a predetermined velocity fluid flows through the chambers and the flow passageway therebetween unimpeded. When the fluid''s velocity rises above the predetermined velocity the valve element moves to close the flow passageway to flow of fluid therethrough. With the valve element positioned on the passageway stopping or significantly restricting flow of fluid, increases in fluid pressure force the valve element through the restricted flow passageway into the other chamber to trap the valve element therein to prevent flow of fluid in either direction through the chambers and the flow passageway.
Inventors
- 👤 J Mason
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 22:37
CPC Classifications
F; F16; F16K; F16K17/00; F16K17/20; F16K17/22; F16K17/24; Y; Y10; Y10S; Y10S137/00; Y10S137/901; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7723; Y10T137/7726; Y10T137/7727; Y10T137/7837; Y10T137/7869; Y10T137/7871; Y10T137/7873; Y10T137/7904; Y10T137/7908; Y10T137/7909; Y10T137/791
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
147 words
A pressure latching check valve comprising: a valve housing for connection into a fluid flow line and containing a flow chamber and a trap chamber and a restricted flow passageway or restriction therebetween; at least one flow port arranged on each of said chambers; and a valve member normally larger than said restriction initially arranged in said flow chamber capable of being moved to close off flow of fluids through said restriction in response to changes in fluid velocity through said chambers and being moved from said flow chamber to said trap chamber through said restriction in response to changes in fluid pressure in said flow chamber, said valve member being resilient to permit movement of said valve member through said restriction into said trap chamber, said valve member preventing flow of fluids through said trap chamber when said valve member is positioned in said trap chamber.
Claim 2
Dependent Claim
147 words
A pressure latching check valve comprising: a valve housing for connection into a fluid flow line and containing a flow chamber and a trap chamber and a restricted flow passageway or restriction therebetween; at least one flow port arranged on each of said chambers; and a valve member normally larger than said restriction initially arranged in said flow chamber capable of being moved to close off flow of fluids through said restriction in response to changes in fluid velocity through said chambers and being moved from said flow chamber to said trap chamber through said restriction in response to changes in fluid pressure in said flow chamber, said valve member being resilient to permit movement of said valve member through said restriction into said trap chamber, said valve member preventing flow of fluids through said trap chamber when said valve member is positioned in said trap chamber.
Claim 3
Dependent Claim
43 words
A check valve as recited in claim 1 in which said trap chamber contains a plurality of ports and said valve member prevents flow of fluids through one or more of said ports when said valve member is positioned in said trap chamber.
Claim 4
Dependent Claim
76 words
A check valve as described in claim 1 in which said valve is double acting and includes an additional trap chamber connected to said flow chamber through another restricted flow passageway or restriction permitting said Valve member to move into either of said trap chambers through said restrictions dependent upon the direction of fluid flow, said flow port on said flow chamber being said restricted flow passageway between said flow chamber and said additional trap chamber.
Claim 5
Dependent Claim
16 words
A check valve as described in claim 1 in which said valve member comprises resilient material.
Claim 6
Dependent Claim
54 words
A check valve as recited in claim 1 in which the relative resiliencies of said valve member and said restriction, the area of said restriction and the relative sizes of said valve member and said restriction control the fluid pressure required to move said valve member through said restriction and set the check valve.
Claim 7
Dependent Claim
145 words
A pressure latching check valve comprising: a valve housing for connection into a fluid flowline and containing a flow chamber and a trap chamber and a restricted flow passageway or restriction therebetween; at least one flow port arranged on each of said chambers; and a valve member normally larger than said restriction initially arranged in said flow chamber capable of being moved to close off flow of fluids through said restriction in response to changes in fluid velocity through said chambers and being moved from said flow chamber to said trap chamber through said restriction in response to changes in fluid pressure in said flow chamber, said restriction being resilient to permit movement of said valve member through said restriction into said trap chamber, said valve member preventing flow of fluids through said trap chamber when said valve member is positioned in said trap chamber.
Claim 8
Dependent Claim
145 words
A pressure latching check valve comprising: a valve housing for connection into a fluid flowline and containing a flow chamber and a trap chamber and a restricted flow passageway or restriction therebetween; at least one flow port arranged on each of said chambers; and a valve member normally larger than said restriction initially arranged in said flow chamber capable of being moved to close off flow of fluids through said restriction in response to changes in fluid velocity through said chambers and being moved from said flow chamber to said trap chamber through said restriction in response to changes in fluid pressure in said flow chamber, said restriction being resilient to permit movement of said valve member through said restriction into said trap chamber, said valve member preventing flow of fluids through said trap chamber when said valve member is positioned in said trap chamber.
Claim 9
Dependent Claim
15 words
A check valve as described in claim 6 in which said restriction comprises resilient means.
Claim 10
Dependent Claim
16 words
A check valve as described in claim 7 in which said resilient means comprises resilient material.
Claim 11
Dependent Claim
21 words
A check valve as described in claim 7 in which said resilient means comprises a closed spring surrounded by resilient material.
Claim 12
Dependent Claim
43 words
A check valve as recited in claim 6 in which said trap chamber contains a plurality of ports and said valve member prevents flow of fluids through one or more of said ports when said valve member is positioned in said trap chamber.
Claim 13
Dependent Claim
76 words
A check valve as described in claim 6 in which said valve is double acting and includes an additional trap chamber connected to said flow chamber through another restricted flow passageway or restriction permitting said valve member to move into either of said trap chambers through said restrictions dependent upon the direction of fluid flow, said flow port on said flow chamber being said restricted flow passageway between said flow chamber and said additional trap chamber.
Claim 14
Dependent Claim
54 words
A check valve as recited in claim 6 in which the relative resiliencies of said valve member and said restriction, the area of said restriction and the relative sizes of said valve member and said restriction control the fluid pressure required to move said valve member through said restriction and set the check valve.
Claim 15
Dependent Claim
149 words
A pressure latching check valve comprising: a valve housing for connection into a fluid flowline and containing a flow chamber and a trap chamber and a restricted flow passageway or restriction therebetween; at least one flow port arranged on each of said chambers; and a valve member normally larger than said restriction initially arranged in said flow chamber capable of being moved to close off flow of fluids through said restriction in response to changes in fluid velocity through said chambers and being moved from said flow chamber to said trap chamber through said restriction in response to changes in fluid pressure in said flow chamber, said valve member and said restriction being resilient to permit movement of said valve member through said restriction into said trap chamber, said valve member preventing flow of fluids through said trap chamber when said valve member is positioned in said trap chamber.
Claim 16
Dependent Claim
149 words
A pressure latching check valve comprising: a valve housing for connection into a fluid flowline and containing a flow chamber and a trap chamber and a restricted flow passageway or restriction therebetween; at least one flow port arranged on each of said chambers; and a valve member normally larger than said restriction initially arranged in said flow chamber capable of being moved to close off flow of fluids through said restriction in response to changes in fluid velocity through said chambers and being moved from said flow chamber to said trap chamber through said restriction in response to changes in fluid pressure in said flow chamber, said valve member and said restriction being resilient to permit movement of said valve member through said restriction into said trap chamber, said valve member preventing flow of fluids through said trap chamber when said valve member is positioned in said trap chamber.
Claim 17
Dependent Claim
43 words
A check valve as recited in claim 13 in which said trap chamber contains a plurality of ports aNd said valve member prevents flow of fluids through one or more of said ports when said valve member is positioned in said trap chamber.
Claim 18
Dependent Claim
76 words
A check valve as described in claim 13 in which said valve is double acting and includes an additional trap chamber connected to said flow chamber through another restricted flow passageway or restriction permitting said valve member to move into either of said trap chambers through said restrictions depending upon the direction of fluid flow, said flow port on said flow chamber being said restricted flow passageway between said flow chamber and said additional trap chamber.
Claim 19
Dependent Claim
16 words
A check valve as described in claim 13 in which said valve members comprises resilient material.
Claim 20
Dependent Claim
15 words
A check valve as described in claim 13 in which said restriction comprises resilient means.
Claim 21
Dependent Claim
16 words
A check valve as described in claim 17 in which said resilient means comprises resilient material.
Claim 22
Dependent Claim
21 words
A check valve as described in claim 17 in which said resilient means comprises a closed spring surrounded by resilient material.
Claim 23
Dependent Claim
54 words
A check valve as recited in claim 13 in which the relative resiliencies of said valve member and said restriction, the area of said restriction and the relative sizes of said valve member and said restriction control the fluid pressure required to move said valve member through said restriction and set the check 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) | 1976-10-22 | 1977-04-23 | 1977-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-22 | 1981-04-23 | 1981-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-22 | 1985-04-23 | 1985-10-23 | $7700.00 | Window Closed / Lapsed |