The ornamental design for a reciprocatingcompressor, as shown and described.
FIG. 1 is a perspective view of top, front and left side of a reciprocating compressor showing my new design;
FIG. 2 is a perspective view of top, rear and right side thereof;
FIG. 3 is a front view thereof;
FIG. 4 is a rear view thereof;
FIG. 5 is a left side view thereof;
FIG. 6 is a right side view thereof;
FIG. 7 is a top view thereof; and,
FIG. 8 is a bottom view thereof.
The broken lines shown are included for the purpose of illustrating the portions of a reciprocating compressor that form no part of the claimed design.