The nominal 15bar or 19bar of espresso machines with steam wand is the highest pressure value of the pump pressure, and the final control pressure is the pump pressure. Most of the best automatic coffee machines for home use vibrating pressure pumps. The pressure curve is incremental, and it does not reach a certain pressure value in an instant. Therefore, The nominal 15bar or 19bar of espresso machines with steam wand is the highest pressure value of the pump pressure, and the final control pressure is the pump pressure. Most of the best automatic coffee machines for home use vibrating pressure pumps. The pressure curve is incremental, and it does not reach a certain pressure value in an instant. Therefore, the pressure given by the home coffee machine is the maximum pressure.
The extraction pressure of the commercial bean to cup coffee machine is 9bar, which refers to the pressure of the brewing head, not the pressure of the boiler, and the necessary pressure of the commercial espresso coffee machine is actually not 9bar, but between 9~10bar, which requires this extraction pressure Very stable to achieve gold extraction rate.
Therefore, the pressure of some coffee machines cannot reach that high at all, and it is not necessarily that the higher the extraction pressure, the better.
