Abstract:
An actuator and valve assembly (28) for a hydraulically-actuated electronically-controlled unit injector (18) is disclosed which comprises an electrically-energizable actuator (36) including a movable member (42) and a poppet valve (38) connected to the movable member (42). The poppet valve (38) has a first seat (146) and a second seat (149) and is movable along an axis (26) between first, second and third positions. The assembly (28) further comprises a device (78) for biasing the poppet valve (38) towards its first position and a device (76, 80) for accommodating misalignment of the first and second seats (146, 149) relative to the axis (26). The poppet valve (38) is advantageous because it has high fluid flow control capability in a one-piece single-stage configuration.