A puncture
valve
is fitted in the top cover of the pump. It is opened when
compressed air from the control air system acts on top of a
piston fitted in the top cover. Fuel oil from the discharge side
is then returned to the suction side of the pump and no
injection takes place. The puncture valve is operated in the
event of actuation of the shut down system (all units), during
the air start sequence or when excessive leakage is detected
from the double skinned fuel pipes.
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