The ornamental design for an expansionvalve, as shown and described.
FIG. 1 is a front perspective view of an expansion valve showing our new design;
FIG. 2 is a rear perspective view thereof;
FIG. 3 is a front elevational view thereof;
FIG. 4 is a rear elevational view thereof;
FIG. 5 is a top plan view thereof;
FIG. 6 is a bottom plan view thereof; and,
FIG. 7 is a left side elevational view thereof; the right side elevational view being a mirror image thereof.
The broken lines shown in the figures are included for the purpose of illustrating portions of the expansion valve and form no part of the claimed design.