FIG. 1 is a front, top and left side perspective view of a flow switch showing a first embodiment of our new design;
FIG. 2 is a rear, bottom and right side perspective view thereof;
FIG. 3 is a front view thereof;
FIG. 4 is a rear view thereof;
FIG. 5 is a top plan view thereof;
FIG. 6 is a bottom plan view thereof;
FIG. 7 is a left side view thereof;
FIG. 8 is a right side view thereof;
FIG. 9 is a front, top and left side perspective view of a flow switch showing a second embodiment of our new design;
FIG. 10 is a rear, bottom and right side perspective view of FIG. 9;
FIG. 11 is a front view of FIG. 9;
FIG. 12 is a rear view of FIG. 9;
FIG. 13 is a top plan view of FIG. 9;
FIG. 14 is a bottom plan view of FIG. 9;
FIG. 15 is a left side view of FIG. 9;
FIG. 16 is a right side view of FIG. 9;
FIG. 17 is a front, top and left side perspective view of a flow switch showing a third embodiment of our new design;
FIG. 18 is a rear, bottom and right side perspective view of FIG. 17;
FIG. 19 is a front view of FIG. 17;
FIG. 20 is a rear view of FIG. 17;
FIG. 21 is a top plan view of FIG. 17;
FIG. 22 is a bottom plan view of FIG. 17;
FIG. 23 is a left side view of FIG. 17;
FIG. 24 is a right side view of FIG. 17;
FIG. 25 is a front, top and left side perspective view of a flow switch showing a fourth embodiment of our new design;
FIG. 26 is a rear, bottom and right side perspective view of FIG. 25;
FIG. 27 is a front view of FIG. 25;
FIG. 28 is a rear view of FIG. 25;
FIG. 29 is a top plan view of FIG. 25;
FIG. 30 is a bottom plan view of FIG. 25;
FIG. 31 is a left side view of FIG. 25; and,
FIG. 32 is a right side view of FIG. 25.
The broken lines depict portions of the flow switch that form no part of the claimed design.