The ornamental design for a fluid controlvalve, as shown and described.
FIG. 1 is a top, front, right perspective view of a fluid control valve;
FIG. 2 is a front elevational view thereof, the rear elevational view (not provided) being a mirror image of the front elevational view;
FIG. 3 is a right-side elevational view thereof, the left-side elevational view (not provided) being a mirror image of the right-side elevational view;
FIG. 4 is a top plan view thereof;
FIG. 5 is a bottom plan view thereof;
FIG. 6 is a view of a cross-section taken along B-B in FIG. 3; and,
FIG. 7 is a view of a cross-section taken along A-A in FIG. 2.
The evenly spaced broken lines depict unclaimed parts of the fluid control valve and form no part of the claimed design.