초록 ▼

A reduced fuel flow to a gas turbine engine experiencing impending overspeed operating conditions is provided through a line (250) which bypasses the main shutoff valve (70) of the engine\s fuel control (20). A transfer valve (260) disposed in the bypass line actuates the shutoff valve in response t

A reduced fuel flow to a gas turbine engine experiencing impending overspeed operating conditions is provided through a line (250) which bypasses the main shutoff valve (70) of the engine\s fuel control (20). A transfer valve (260) disposed in the bypass line actuates the shutoff valve in response to such overspeed conditions while opening the normally closed bypass line. A flow resticter (275) and the fuel control\s main pressure regulating valve (210) combine to maintain the reduced fuel flow at a predetermined valve.

대표청구항 ▼

In a fuel control for a gas turbine engine including a burner, fuel being supplied to said burner through a main fuel line having a shutoff valve therein, said shutoff valve under normal engine operating conditions, being opened to allow fuel flow to said burner and closed to shut off said fuel flow

In a fuel control for a gas turbine engine including a burner, fuel being supplied to said burner through a main fuel line having a shutoff valve therein, said shutoff valve under normal engine operating conditions, being opened to allow fuel flow to said burner and closed to shut off said fuel flow, the improvement characterized by: a bypass line communicating at opposite ends thereof with said main fuel line for shunting fuel flow in said main fuel line around said shutoff valve; means disposed in said bypass line for restricting flow therethrough to a value sufficient to maintain at sea level, only minimal positive thrust output of said engine; and control means communicating with said bypass line and operatively connected to said shutoff valve, said control means, under normal operating conditions, effecting the blocking of said bypass line and, under impending overspeed conditions, effecting a simultaneous closing of said shutoff valve and an unblocking of said bypass line to shunt said restricted flow around said shutoff valve to said engine.