Patent ID: 8783165

Claim:
A coffeemaker comprising: a water tank; a water pump; a heating element having a relief valve; an extractor; at least one one-way waterway communicating with each of the water tank, the water pump, the relief valve of the heating element and the extractor in turn; a controller having a single chip control system that is configured to control a running of the water pump so as to control a pumping power of the water pump; and a pressure-keeping mechanism provided in the at least one one-way waterway so as to be at an inlet end of the extractor, the pressure-keeping mechanism being provided for regulating water pressure, said pressure-keeping mechanism including: a pressure-keeping seat with an axial through hole, a chuck plug provided with a coupling surface that is coupleable with one side of the through hole of the pressure-keeping seat and being movable to a position to completely block the through hole, and an accumulating spring having one end fixed to the chuck plug and another end fixed to another part of the pressure-keeping mechanism, wherein the pressure-keeping seat, the chuck plug and the spring are placed in turn along a direction of the at least one waterway.