One-way valve

A one-way valve to control the release of pressurized gas from within a single serve beverage capsule having a flexible lid with a venting aperture therethrough, when in use in a brewer a spigot piercing the flexible lid to inject liquid into the beverage capsule to form a liquid beverage, the valve comprising:

• a layer of flexible material having an upper and a lower surface, a portion of said upper surface adhered to the flexible lid of the beverage capsule such that said flexible material overlays the venting aperture, said flexible material including a generally centrally located opening therethrough, said opening aligned with an area of said flexible lid that is pierced by said spigot such that during operation of the brewer said flexible material is not contacted by the spigot, and
• a channel defined by a portion of the flexible lid and an adjacent portion of said flexible material which has not been adhered to the flexible lid, said layer of flexible material adhered to said flexible lid such that said channel is formed between said flexible lid and said flexible material at a location on said flexible lid that does not intersect with the piercing of said flexible lid by the spigot,
• said channel in communication with said venting aperture and in communication with an exhaust gas aperture in said layer of flexible material, said channel operable between a closed and an open configuration upon gas pressure within the beverage capsule exceeding a predetermined limit, movement of said channel from said closed position to said open position permitting gas to flow from the beverage capsule, through said venting aperture, through said channel, through said exhaust gas aperture and into the exterior atmosphere;
• and
• when the gas pressure within the beverage capsule is less than the predetermined limit said channel is in said closed position restricting the flow of gas between said venting aperture and said exhaust gas aperture.