Ventilation valve

Description

5.1 is a perspective view of a ventilation valve showing our new design;

5.2 is a side view thereof;

5.3 is another perspective view thereof; and

5.4 is a top view thereof.

The broken lines in the drawings depict portions of the ventilation valve that form no part of the claimed design.

Claims

The ornamental design for a ventilation valve, as shown and described.