| 摘要 |
An improved process and apparatus for the extraction of espresso coffee from ground coffee beans in which the pressure of extraction is precisely regulated by a pressure valve and is not dependent on coffee grind size, degree of compaction of the coffee grind, or operator skill. A feature of the invention is in an assembly of the brewing chamber and regulator valve for convenient removal and attachment to an espresso machine as a unit without otherwise modifying the machine. The assembly is configurable with the regulator valve within a common housing which also defines the brewing chamber, or with a regulator valve separate from the brewing chamber assembly but attached to an outlet of the brewing chamber.
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