an actuator for moving the check along an axial path between a sealing position wherein {TAIL ~ the sealing portion} is in sealed contact with the valve seat and isolates the injector nozzle orifice from the injector inlet and an open position wherein the sealing portion is spaced from the valve seat to place {HEAD ~ the injector nozzle orifice} in fluid communication with the injector inlet; and 
an actuator for moving the check along an axial path between a sealing position wherein { TAIL ~ the sealing portion } is in sealed contact with the valve seat and isolates the injector nozzle orifice from the injector inlet and an open position wherein the sealing portion is spaced from the valve seat to place { HEAD ~ the injector nozzle orifice } in fluid communication with the injector inlet ; and
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