Start, shutoff and overspeed system for gas turbine engine

Details Start, shutoff and overspeed system for gas turbine engine Start, shutoff and overspeed system for gas turbine engine

1997-12-23

1999-07-27

Casaregola, Louis J.

Power plants

Combustion products used as motive fluid

Different fluids

60 39281, F02C 928

Patent

active

059270640

ABSTRACT:
A start, shutoff and overspeed system includes a shutoff valve which permits the flow of fuel to an engine when the pressure of the main flow of fuel received from the fuel pump at first end of the shutoff valve exceeds a bias pressure at a second end of the shutoff valve. The bias pressure at the second end of the shutoff valve is controlled by an overspeed governor valve operating in conjunction with a start solenoid valve and shutoff solenoid valve. The overspeed governor positions a spool valve in response to engine speed. During engine start the spool valve sets the bias pressure to a first pressure which closes the shutoff valve, permitting fuel flow to the engine. As speed increases the spool must transition to a second position to maintain the shutoff valve in a closed position. If the spool fails to transition, the start solenoid will set the bias pressure such that the shutoff valve will prevent engine start. The overspeed governor will transition to a third position, for an overspeed condition, which controls the bias pressure such that the engine will operate at a reduced speed. The shutoff solenoid operates to shut the engine down regardless of overspeed governor or start solenoid position.

REFERENCES:
patent: 4493187 (1985-01-01), Hansen
patent: 4602479 (1986-07-01), Hansen
patent: 4716723 (1988-01-01), Ralston et al.
patent: 4760662 (1988-08-01), Dyer et al.

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