US3784329A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fuel supply arrangements for gas turbine engines
Assignee: Northrop Grumman Properties Ltd
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Filing: 1972-12-29
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Granted: 1974-01-08
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Expires: 1992-12-29
Abstract
Abstract A fuel supply arrangement for a gas turbine engine comprises a pair of centrifugal fuel pumps and a fuel control apparatus downstream of the pumps. A valve is responsive to the fuel pressure downstream of the control apparatus to connect said pumps in series or to cause the fuel flow to be provided by one of the pumps.
Inventors
- 👤 A Crawley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:16
CPC Classifications
F; F02; F02C; F02C7/00; F02C7/22; F02C7/236; Y; Y10; Y10T; Y10T137/00; Y10T137/2496; Y10T137/2559; Y10T137/2562
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
144 words
A fuel supply arrangement for a gas turbine engine comprising first and second centrifugal pumps each having an inlet and an outlet, the inlet of the first pump providing an inlet for the arrangement, a conduit for supplying fuel to the engine, means for connecting the outlet of said second pump to said conduit, fuel control apparatus in said conduit, and valve means responsive to the fuel pressure in said conduit downstream of said control apparatus and operable when said fuel pressure exceeds a predetermined value to establish a connection between the outlet of said first pump to the inlet of said second pump and, when fuel pressure is less than said predetermined level to connect the outlet of said first pump to said conduit and shut off the connection between the inlet of said second pump and the outlet of said first pump.
Claim 2
Dependent Claim
144 words
A fuel supply arrangement for a gas turbine engine comprising first and second centrifugal pumps each having an inlet and an outlet, the inlet of the first pump providing an inlet for the arrangement, a conduit for supplying fuel to the engine, means for connecting the outlet of said second pump to said conduit, fuel control apparatus in said conduit, and valve means responsive to the fuel pressure in said conduit downstream of said control apparatus and operable when said fuel pressure exceeds a predetermined value to establish a connection between the outlet of said first pump to the inlet of said second pump and, when fuel pressure is less than said predetermined level to connect the outlet of said first pump to said conduit and shut off the connection between the inlet of said second pump and the outlet of said first pump.
Claim 3
Dependent Claim
75 words
A fuel supply arrangement as claimed in claim 1 in which said valve means comprises a pressure operable valve controlling the connection of the first pump outlet to said conduit and to the second pump inlet and a pilot valve sensitive to the fuel pressure in said conduit downstream of said fuel control apparatus and arranged to provide a pressure signal for operating said pressure operable valve when said fuel pressure exceeds said predetermined valve.
Claim 4
Dependent Claim
48 words
A fuel supply arrangement as claimed in claim 2 in which said pressure operated valve includes a piston portion slidable in a bore and a flow restrictor is provided for restricting flow into and out of said bore so as to damp movement of the pressure operated valve.
Claim 5
Dependent Claim
44 words
A fuel supply arrangement as claimed in claim 2 in which said valve means further comprises a pair of non-return valves connecting the outlet of the second pump and said pressure operated valve respectively to the conduit and preventing flow therethrough from the conduit.
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) | 1977-01-07 | 1977-07-09 | 1978-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-07 | 1981-07-09 | 1982-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-07 | 1985-07-09 | 1986-01-08 | $7700.00 | Window Closed / Lapsed |