| 摘要 |
<p>A fuel system comprises a spill valve (38) operable to relieve the fuel pressure differential across at least one positive displacement pump (16, 18), a shut-off valve (32) operable to control the supply of fuel to an engine (84), and a two stage servo-valve (62) operable to control the operation of the shut-off valve (32), the spill valve (38) having a control chamber (40) the fluid pressure within which is controlled so as to be held at an intermediate level during engine shut-down.
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