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5.2 The SBS system
Distribution Process
The SBS distribution system (see figure 2) can be set using a button and is used to change (by increase
or decrease depending on the position of the button) the flow of water into the group for percolation.
Thus the percolation time can be varied (extraction time) and, consequently, the intensity of the flavour,
while keeping the coffee smooth.
Function
When the SBS valve is open coffee accumulates inside the membrane valve due to a weak counter
pressure from the SBS valve. The valve needle thus remains in its maximum open position due to the
resistance of the spring. The coffee flows quickly (see figure 3). When the SBS valve is closed, coffee
accumulates on the valve membrane and increases the pressure inside the valve. The spring releases due
to the counter pressure and the valve needle reduces the flow of coffee (see figure 4).
Fig 1 Fig.2
Fig.3 Fig.4
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