The ornamental design for a valvegearoperator, as shown and described.
FIG. 1 is a perspective view of a valve gear operator showing our new design with a handle shown in broken lines and mounted to a valve also shown in broken lines;
FIG. 2 is a front elevational view thereof;
FIG. 3 is a rear elevational view thereof;
FIG. 4 is a side elevational view of thereof;
FIG. 5 is a side elevational view of a side opposite that shown in FIG. 4;
FIG. 6 is a top plan view thereof; and,
FIG. 7 is a bottom plan view thereof.
The broken lines shown in FIGS. 1-7 are for purposes of illustrating environment only and form no part of the claimed design.