Injector and Poppet Nozzle Assembly

Injector And Poppet Nozzle Assembly:

Each fuel injector assembly is a solenoid - operated device, controlled by the control module. The fuel injector assembly meters the pressurized fuel through a puppet nozzle valve (5) to a single engine cylinder. The control module energizes the flow control solenoid (2), which opens an armature valve (3), allowing fuel to flow past the valve and through a flexible fuel pipe (1) to the puppet nozzle valve. An increase in fuel pressure causes the puppet nozzle ball to open from a seat against the extension spring force. This allows the fuel to flow from the nozzle.

De-energizing the flow control solenoid (2) closes the armature valve (3). De-energizing the solenoid also reduces the fuel pressure acting on the puppet nozzle ball. The extension spring closes the ball to the seat. The extension spring also checks the pressure between the ball and seat of the puppet nozzle valve (5) and the injector armature (3) and the seat (4).