Air admittance valve

A one-way valve for selectively opening or closing a boundary between an inlet and an outlet so as to enable or prevent, respectively, the flow of fluid therebetween, the one-way valve comprising:

• a body having a lower connecting portion and an upper valve portion integrally connected to the lower portion, the upper valve portion including a centrally disposed valve chamber having an upper peripheral portion that terminates an edge, the edge defining a valve seat;
• a sealing member that is movable relative to the valve seat and configured to selectively seal against the valve seat, the sealing member defining a diaphragm and a support ring attached to an outer portion of the diaphragm, the support ring including at least one lug;
• and
• a cap connected to the body at the upper valve portion so as to create an airtight seal therewith, the cap having an inner portion that is defined by an interior surface, wherein the sealing member is configured such that the sealing member translates and angulates within the inner portion, and wherein the interior surface is configured such that the interior surface selectively abuts one or more of the at least one,
• wherein:
• the valve seat defines a center and a radius RV with respect to the valve center,
• the diaphragm defines a center and a radius RD with respect to the diaphragm center,
• the support ring defines a center and the at least one lug defines a radius RL with respect to the support ring center, and
• the cap defines a center and the interior surface defines a radius RC with respect to the cap center,
• such that:
• RV<RD<RL<RC<(RL+RD−RV).