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.
The Exhalation Valve Filter is designed to help filter the exhaled breath of the respirator wearer and provides source control when worn with the 3M 6000 Series Half Facepiece Reusable Respirator. NIOSH approved accessory only for use with 3M 6000 Series Half Facepiece respirators when used with 3M Particulate Filters 7093, 2091 or 5N11/501/603.
Some types of respirators include an exhalation valve that opens to allow exhaled air to escape through the valve and closes to force inhaled air through the filter. In filtering facepiece respirators (FFRs) and elastomeric half mask respirators (EHMRs), exhalation valves typically include a membrane composed of natural rubber, silicone, or neoprene.
