Expansion valve

FIG. 1 is a perspective view taken from the top right hand end of FIG. 5 of an expansion valve showing my new ornamental design;

FIG. 2 is a perspective view taken from the top left hand end of FIG. 5 of an expansion valve showing my new ornamental design;

FIG. 3 is a frontal elevational view thereof;

FIG. 4 is a side view thereof taken from the right side;

FIG. 5 is a top view thereof;

FIG. 6 is a bottom view thereof; and,

FIG. 7 is a side view thereof taken from the left side.