| 摘要 |
A vented keg closure 1 for use with a keg that contains a fermenting beverage is described. The closure 1 comprising a filter member 41 disposed within an airway of the closure 1 that communicates between an internal headspace 36 of the keg 30 and an environment external to the keg 30. The closure 1 has a first configuration wherein the filter member 41 is located at a first position at which it filters gas flowing through the airway. The closure 1 also has a second configuration (Fig.3) wherein the filter member 41 is located at a second position at which gas flow through the airway can be increased by at least partially bypassing the filter 41. The extent of movement between the first and second configurations is controlled by the gas pressure difference across the airway. The keg closure allows the venting of gaseous products of secondary fermentation. |
