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The ornamental design of a rotary valve shaft, as shown and described. |
FIG. 1 is a top plan view of a rotary valve shaft showing my new design;
FIG. 2 is a bottom view thereof;
FIG. 3 is a front elevational view thereof, the rear being a mirror image of the front shown;
FIG. 4 is a left end elevational view thereof;
FIG. 5 is a right end elevational view thereof; and
FIG. 6 is a cross sectional view taken on line 6--6 of FIG. 1.
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