Fuel system for gas turbine engines

Details Fuel system for gas turbine engines Fuel system for gas turbine engines

1986-07-28

1988-08-02

Casaregola, Louis J.

Power plants

Combustion products used as motive fluid

Combined with regulation of power output feature

60734, F02C 926

Patent

active

047606967

ABSTRACT:
The present invention is particularly concerned with the supply of fuel to fuel servos of gas turbine engines. A check valve (62) is positioned in a return pipe (40, 24, 22, 26) from a fuel spill valve (12) to the upstream low pressure side of a high pressure pump (10). An aperture (32) in a piston (30) of the check valve (62) produces a predetermined pressure drop across the check valve (62) when the flow of excess fuel reaches a predetermined value. A fuel servo shut off valve (64) is positioned in a pipe (42, 58) connecting a fuel flow regulator (14) to a fuel servo (80). A piston (46) of the fuel servo shut off valve (64) initially closes a chamber (56) to prevent fuel being supplied to the fuel servo (80), from the fuel flow regulator (14). The piston (46) of the fuel servo shut off valve (64) is moved against a spring (48) when the predetermined pressure drop is formed across the check valve (62) to allow fuel to be supplied from the fuel flow regulator (14) to the fuel servo (80) via chamber (56).
This arrangement allows the use of a smaller pump and reduces recirculation and temperature rises in the fuel at ground idle.

REFERENCES:
patent: 3126942 (1964-03-01), Tyler
patent: 3858390 (1975-01-01), Jansen et al.
patent: 4607486 (1986-08-01), Cole

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