What's the mechanism of Exhalation Valve and Inhalation Valve for Masks & Respirators?

Here is the mechanism of the Exhalation Valve & Inhalation valve

Valves on masks and respirators are very simple: plastic base, middle rubber and plastic cover; to make it simple, we will take away the top cover to see how the rubber and base work with the air.

The middle silicone rubber is very soft, so you can move it by your breathing:

-- When air comes from the rubber side, it makes the rubber stick on the plastic base firmly to cover the hole not allow air in from here.

--When air comes from the base plastic side, it blows open the rubber edge (but still fastened on the base in the middle) to allow the air goes through the hole.

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If you understand the above mechanism, then the question of “what is exhaust valve and what’s inhale valve? When to use them?” is very easy now.

Dust mask & N95 Respirator Masks

Only EXHAUST VALVE used on them to help remove the heat inside.

Respirators

Both EXHAUST and INHALE valves used, but inhale valve used together with the filtering cartridges.

The description provided by the Mask Material, please indicate the source!

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