Aerodynamic noise reduction cage

A control valve, comprising:

• a body having an inlet and an outlet;
• a valve seat positioned in a passageway of the body between the inlet and the outlet;
• a valve plug positioned within the body and movable between a closed position, in which the valve plug sealingly engages the valve seat, and an open position, in which the valve plug is spaced away from the valve seat;
• and
• a cage disposed within the body adjacent the valve seat and proximate the valve plug to provide guidance for the valve plug, the cage comprising:
• a solid, unitary circumferential wall having an inner surface and an outer surface;
• a sealed cavity formed in the wall of the cage;
• and
• a plurality of passages formed through the wall and extending between the inner surface and the outer surface;
• wherein
• each of the passages follows an arcuate, non-linear path from the inner surface to the outer surface.