US3753627A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pump bypass liquid control
Assignee: Sundstrand Corp
•
Filing: 1971-04-09
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Granted: 1973-08-21
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Expires: 1991-04-09
Abstract
Abstract A fluid circulation system having a primary flow circuit for supplying fluid under pressure to an operating unit for performing a desired control function and a secondary flow circuit operative under regulated pressure conditions of said primary flow circuit for effecting a regulated control of the fluid being circulated in said secondary flow circuit. The pressure and rate of flow of fluid in the secondary flow circuit is a function of the pressure and rate of flow of fluid in the primary circuit.
Inventors
- 👤 E Ward
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 19:07
CPC Classifications
F; F04; F04B; F04B49/00; F04B49/22; F04B49/24; F04B1/00; F04B1/12; F04B1/26; F04B1/30; F04B1/32; F04B1/324; F04B49/08
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
131 words
A pump assembly comprising: a pump casing; pump means operable within said casing to pump fluid for flow between inlet and discharge sides of said pump means; said pump means having a movable member which controls the quantity of fluid being discharged therefrom; a main discharge passageway means communicable with the pump means discharge; a bypass discharge passageway means selectively communicable with said pump means discharge; movable means to selectively control flow through said bypass discharge passageway means and operable to establish such bypass flow when a predetermined pressure has been reached in said main discharge passageway means; and said movable means additionally being operable to engage and move said movable member to decrease the quantity of fluid being discharged from said pump means when said predetermined pressure has been reached.
Claim 2
Dependent Claim
131 words
A pump assembly comprising: a pump casing; pump means operable within said casing to pump fluid for flow between inlet and discharge sides of said pump means; said pump means having a movable member which controls the quantity of fluid being discharged therefrom; a main discharge passageway means communicable with the pump means discharge; a bypass discharge passageway means selectively communicable with said pump means discharge; movable means to selectively control flow through said bypass discharge passageway means and operable to establish such bypass flow when a predetermined pressure has been reached in said main discharge passageway means; and said movable means additionally being operable to engage and move said movable member to decrease the quantity of fluid being discharged from said pump means when said predetermined pressure has been reached.
Claim 3
Dependent Claim
24 words
A pump assembly as specified in claim 1 wherein said movable means maintains at least a cooling flow of fluid through said pump means.
Claim 4
Dependent Claim
48 words
A pump assembly as specified in claim 1 additionally including another movable means operable to establish communication between a portion of the flow through said main discharge passageway means and said first mentioned movable means when a predetermined pressure has been reached in said main discharge passageway means.
Claim 5
Dependent Claim
31 words
A pump assembly as specified in claim 3 wherein such portion of such flow through said main discharge passageway means aids said first mentioned movable means in establishing such bypass flow.
Claim 6
Dependent Claim
47 words
A pump assembly as specified in claim 3 wherein said first and second mentioned movable means are spring biased into a first position and establishment of such a bypass flow requires overcoming such spring bias by the portion of the flow through said main discharge passageway means.
Claim 7
Dependent Claim
32 words
A pump assembly as specified in claim 1 wherein said movable means is spring biased into a first position and establishment of such a bypass flow requires overcoming such a spring bias.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-08-20 | 1977-02-19 | 1977-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-20 | 1981-02-19 | 1981-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-20 | 1985-02-19 | 1985-08-21 | $7700.00 | Window Closed / Lapsed |