Actually that orange mask protects you from inspiring but those valves allow airflow to escape readily and are therefore 100% useless for the reasons we need to wear masks at present. One of the prime reasons the KN masks are not considered appropriate for us. it is the exhale/cough that we need to protect against
I actually 3D print the orange masks. It is not a valve, it is actually 3 layer filter material from masks. It protects both ways. The picture is actually my 2nd revision. I now have masks with 75% more surface area for the filter material. Very easy to breath and they don't get hot because it is not cloth against your whole face. I understand what you are saying because I hate when people have valves, it is just wrong. These protect both on inhale and exhaust.