Fuel injection nozzle having a force-balanced check

摘要

A check valve assembly for a fuel injector includes an injector body having an injector bore therein, an elongate check disposed within the injector bore and an actuator for moving the check along an axial path between a sealing position and an open position. Axial forces acting on the check are balanced during movement between the sealing and open positions so that direct control over the check position may be accomplished through the use of a low-force actuator.