Patent US3874170A successfully refreshed from Google Patents.
US3874170A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fuel control apparatus for gas turbine engine reheat systems
Assignee: Northrop Grumman Properties Ltd
•
Filing: 1973-04-06
•
Granted: 1975-04-01
•
Expires: 1993-04-06
Abstract
Abstract A fuel control apparatus for a gas turbine engine reheat system has a variable metering arrangement responsive to engine operating parameters to control fuel flow to the reheat burners, and a distributor valve arrangement between the metering arrangement and the burners. The distributor arrangement is operable in one mode to connect the metering arrangement to the burners, and in another mode to shut off fuel from the metering arrangement and to connect the burners to a low pressure drain.
Inventors
- 👤 Geoffrey Arthur Lewis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 09:52
CPC Classifications
F; F02; F02C; F02C7/00; F02C7/22; F02C7/232
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
167 words
A fuel control apparatus for a gas turbine engine reheat system, including a variable metering arrangement for controlling fuel flow to the engine reheat burners, a low pressure drain and a valve arrangement operable in one position thereof to connect said metering arrangement to said burners and in another position to connect said burners to said low pressure drain, said valve arrangement comprising first, second and third ports respectively communicating with said metering arrangement, said burners and said drain, valve seats between said first and second ports and between said second and third ports, a closure member movable to selectively engage said valve seats, means for biasing said closure member towards engagement with one of the seats, means responsive to a control pressure signal to move said closure member against said biasing means into engagement with the other of said seats, a dump valve between said third port and said low pressure drain, and means responsive to a further control pressure signal to open said dump valve.
Claim 2
Dependent Claim
167 words
A fuel control apparatus for a gas turbine engine reheat system, including a variable metering arrangement for controlling fuel flow to the engine reheat burners, a low pressure drain and a valve arrangement operable in one position thereof to connect said metering arrangement to said burners and in another position to connect said burners to said low pressure drain, said valve arrangement comprising first, second and third ports respectively communicating with said metering arrangement, said burners and said drain, valve seats between said first and second ports and between said second and third ports, a closure member movable to selectively engage said valve seats, means for biasing said closure member towards engagement with one of the seats, means responsive to a control pressure signal to move said closure member against said biasing means into engagement with the other of said seats, a dump valve between said third port and said low pressure drain, and means responsive to a further control pressure signal to open said dump valve.
Claim 3
Dependent Claim
44 words
An apparatus as claimed in claim 1 in which said closure member is responsive to said control signal to connect said metering arrangement to said burners, and which includes means, responsive to a requirement to light the reheat system, for providing said control signal.
Claim 4
Dependent Claim
29 words
An apparatus as claimed in claim 2 in which the means for providing said signal comprises a selector valve responsive to the position of an engine power demand control.
Claim 5
Dependent Claim
42 words
An apparatus as claimed in claim 1 in which said selector valve is operative to remove said further control pressure signal, and thereby to close said dump valve before providing the first-mentioned control signal to connect said metering arrangement to said burners.
Claim 6
Dependent Claim
43 words
An apparatus as claimed in claim 4 which includes a relay valve operable to apply the first-mentioned pressure signal to said third port, whereby when said dump valve is moved by said biasing means to connect said burners to said low pressure drain.
Claim 7
Dependent Claim
36 words
An apparatus as claimed in claim 1 in which said metering arrangement includes first, second and third metering orifices responsive to engine operating parameters to control fuel flow to respective ones of the engine reheat burners.
Claim 8
Dependent Claim
76 words
An apparatus as claimed in claim 6 in which said valve arrangement comprises a plurality of first ports respectively communicating with said first, second and third metering orifices, a plurality of second ports respectively associated with said first ports and communicating with respective ones of said reheat burners, a plurality of third ports associated with respective groups of first and second ports and commonly connected to said low pressure drain, and a plurality of closure members.
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) | 1978-03-31 | 1978-09-30 | 1979-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-31 | 1982-09-30 | 1983-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-31 | 1986-09-30 | 1987-04-01 | $7700.00 | Window Closed / Lapsed |