The ornamental design for a three-way valve, as shown and described.
FIG. 1 is a perspective view of a three-way valve showing my new design as viewed from a front top side of the three-way valve;
FIG. 2 is a rear view of the three-way valve shown in FIG. 1;
FIG. 3 is a front view of the three-way valve shown in FIG. 1;
FIG. 4 is a right-side view of the three-way valve shown in FIG. 1;
FIG. 5 is a left-side view of the three-way valve shown in FIG. 1;
FIG. 6 is a top view of the three-way valve shown in FIG. 1;
FIG. 7 is a bottom view of the three-way valve shown in FIG. 1;
FIG. 8 is another top view of the three-way valve shown in FIG. 1; and,
FIG. 9 is a rear view of the three-way valve shown in FIG. 1 showing a cross-sectional view 9-9 as shown in FIG. 8.
The dot-dash broken lines shown in the drawings define the boundaries of the claimed design and form no part thereof. The dashed broken lines shown in the drawings illustrate portions of the three-way valve and form no part of the claimed design.