呼吸閥作用原理：當(dāng)在呼氣時排出的氣體的正壓可以將閥門吹開，以迅速將體內(nèi)的廢 除，這樣就可以降低使用口罩時的悶熱感，而在吸氣的時候，負壓會自動將閥門關(guān)閉，這樣就可以避免外 界的污染物通過呼吸閥進入人體呼吸系統(tǒng)，對人體造成傷害。

The working principle of the breathing valve: When the positive pressure of the gas discharged during exhalation can blow the valve open to quickly remove the exhaust gas from the body, this can reduce the stuffy feeling when using a mask, and when inhaling, the negative pressure The valve will be closed automatically, so that the external pollutants can be prevented from entering the human respiratory system through the breathing valve and causing harm to the human body.