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