FIG. 1 is a top, front, left perspective view of a dust cover for a valve showing our new design;
FIG. 2 is a front elevational view thereof;
FIG. 3 is a right side elevational view thereof;
FIG. 4 is top plan thereof;
FIG. 5 is a left side elevational view thereof;
FIG. 6 is a rear elevational view thereof; and,
FIG. 7 is a bottom view thereof.
The subject matter shown in broken line in FIG. 1 represents the location of unclaimed environmental structure—viz., the location of a container and valve—which can be of any ornamental appearance and forms no part of the claimed design.