• Puncture valve is provided on the delivery side of the fuel pump and is used to cut of the fuel injector
  • The puncture valve consists of a piston which communicates with the control air system of the engine. 
  • In the event of actuation of the shut-down system, and when 'STOP' is activated, compressed air causes the piston with pin to be pressed downward and 'puncture' the oil flow to the fuel valve.
  •  As long as the puncture valve is activated, the fuel oil is returned through a pipe to the pump housing, and no injection takes place. 

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