FIG. 1 is a right front perspective view of an expansion valve; FIG. 2 is a left rear perspective view thereof; FIG. 3 is a front view thereof; FIG. 4 is a rear view thereof; FIG. 5 is a plan view thereof; FIG. 6 is a bottom view thereof; FIG. 7 is a left side view thereof; and, FIG. 8 is a right side view thereof.