Exhalation Valve Description: Exhalation Valve also called as expiratory valve, umbrella valve and membrane valve, is a kind of one-way valve, check valve and non-return valve that are widely used as sealing parts in backflow prevention devices for controlling air or liquid flow in one direction and check flow in the opposite direction.
Description. Exhalation Valves reduce heat build up inside the respirator to help keep the wearer more comfortable making it easier to breathe. Do you already have a face mask but somehow you are missing a breathing valve or two? Or do you have a broken valve? These replacement Exhalation Valves are the answer to your problem!
