A linear actuator includes a stator assembly and a rotor assembly operatively associated with the stator assembly and mounted for rotation with respect to the stator assembly. A shaft is restricted from rotation and is associated with the rotor assembly such that rotation of the rotor assembly causes linear movement of the shaft. A capnut is associated with a distal end of the shaft for movement therewith. A shroud is coupled to the stator assembly and substantially surrounds the capnut. The shroud includes a valve seat, and an inlet communicating with an outlet through a throttle opening adjacent to the valve seat. The shaft and associated capnut are constructed and arranged to move relative to the valve seat to control air flow between the inlet and the outlet.