The ornamental design for a valveregulator, as shown and described.
FIG. 1 is a top left front perspective view of a valve regulator showing our new design;
FIG. 2 top bottom right rear perspective view thereof;
FIG. 3 is a left side elevational view thereof;
FIG. 4 is an right side elevational view thereof;
FIG. 5 is a top plan view thereof;
FIG. 6 is a bottom plan view thereof;
FIG. 7 is a front elevational view thereof; and,
FIG. 8 is a rear elevational view thereof.
In the drawings, the broken lines showing of the inlet and outlet tubes depict environmental subject matter only and form no part of the claimed design.