FUEL FLOW CONTROL DEVICE WITH EMERGENCY SPEED REDUCING FUNCTION

摘要

PROBLEM TO BE SOLVED: To provide a fuel flow control device with an emergency speed reducing function capable of injecting fuel flow in proportion to the displacement of a nozzle flapper during normal operation and urgently decelerating an engine with less time lag and a high response at the time of excessive rotational speed. SOLUTION: An over-speed valve 10 capable of switching a flow passage resistance into large and small modes is installed in a pressurized feel line ranging from a fuel pump 1 to a nozzle 4. The over-speed valve 10 comprises a flow-passage switching valve 11 for selectively switching an inflow port 10a to two branch flow passages 10b and 10c and a resistance generating body 12 allowing to flow from the first branch flow passage 10b to an outflow port 10d with a small pressure loss and to flow from the second branch flow passage 10c to the outflow port 10d with a large pressure loss. The resistance generating body 12 is a swirl chamber having a cylindrical hollow.