1results about How to "Avoid affecting the tightness" patented technology

This utility model discloses an exhalation valve assembly for a protective face mask, including an exhalation valve base connected to the face mask. The exhalation valve base contains, from the inside out, a secondary valve plate, an exhalation valve protective seat, a primary valve plate, and an exhalation valve cover. The exhalation valve base has a cavity, and the inner wall of the cavity is formed with an exhalation valve cover mounting step and an exhalation valve protective seat mounting step. The exhalation valve protective seat is fastened onto the exhalation valve protective seat mounting step. The primary valve plate is mounted on the exhalation valve protective seat. The exhalation valve cover is positioned on the exhalation valve cover mounting step and presses against the top surface of the exhalation valve protective seat. A locking component is formed on the side wall of the exhalation valve cover mounting step. This utility model achieves double barrier by setting a primary valve plate and a secondary valve plate inside the exhalation valve base, blocking particulate matter in the air, preventing toxic substances from entering the face mask, reducing the corrosion of internal components by toxic gases, and extending the service life of the internal components of the face mask.