Philips Saeco Exprelia Series, Service Manual

Page: 27 / 56

EXPRELIA 04 OPERATING LOGIC
Saeco International Group Rev. 00 / June 2010 Page / 11
09
SBS - Saeco Brewing System - Principle
Controlling the fl ow speed, which in fl uences
the contact time between the coffee and
water, changes the extraction and therefore
the taste intensity and strength of the coffee.
Slower fl ow: strong extraction •
Fast fl ow: lighter extraction •
SBS / dispensing valve
Turning the SBS control knob leads to brewing
taking place inside the brewing unit, where
the fl ow speed is adjusted using a cream
valve.
Cream valve control
Fast fl ow (slight extraction)
If the SBS valve is open, the coffee fl ows
more easily because the pressure is lower
and the membrane, with the support of
the spring, remains almost in its original
position.
The control needle does not close off the
opening and the fl ow is not diminished.
Cream valve control
Slow fl ow (strong extraction)
The coffee can only be dispensed slowly with
a closed SBS valve – a pressure is created
which forces the membrane to the side,
pushing it against the spring force.
In the next stage, the valve needle closes off
the opening, thus reducing the fl ow.
4.10. SBS