| 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 (16) 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 (44) and regulator valve (48) for convenient removal and attachment to an expresso machine (10) as a unit (40) without otherwise modifying the machine. The assembly (40) is configurable with the regulator valve (48) within a common housing (41) which also defines the brewing chamber (44), or with a regulator valve (35) separate from the brewing chamber assembly (28) but attached to an outlet (33) of the brewing chamber (28). |
