The ornamental design for a fluid controlvalveactuator, as shown and described.
FIG. 1 is a perspective view of a fluid control valve actuator showing our new design;
FIG. 2 is a top view thereof;
FIG. 3 is a right side view thereof;
FIG. 4 is a front elevational view thereof;
FIG. 5 is a bottom view thereof;
FIG. 6 is a left side view thereof; and,
FIG. 7 is a rear elevational view thereof.
The broken lines in the drawings are included for the purpose of illustrating portions of the fluid control valve actuator and form no part of the claimed design.