Ariston MCA 16 Service Manual download pdf (Page 10)

OPERATION

Service Manual

P0055 Coffee Machine - 2006

Edition

2006.08.28

Language

English

2.6. SBS VALVE

Beverage dispensing

The SBS delivery valve (see fig. 2), which is

adjustable using the knob, serves to alter (increase

or decrease depending on the knob setting) the

ﬂ owrate of water for brewing in the unit.

This serves to alter the coffee brewing time (extraction

time) and consequently the intensity of ﬂ avour, while

maintaining the quantity of crema constant.

Function

With the SBS valve in its open position, an

accumulation of coffee is obtained inside the

diaphragm valve due to the low counter-pressure

of the SBS valve. Consequently the membrane

valve needle remains in the fully open position due

to resistance of the spring. The coffee is delivered

rapidly (see Fig. 3).

With the SBS valve in its closed position, an

accumulation of coffee is obtained on the valve

diaphragm resulting in a pressure build-up inside the

valve. The spring succumbs to the counter-pressure

and the valve element consequently reduces the ﬂ ow

of coffee (see ﬁ g. 4).

Fig. 1

Fig. 2

Fig. 3

Fig. 4

1 2 ... 5 6 7 8 9 10 11 12 13 14 15 ... 42 43

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Ariston MCA 16 Service Manual Page 10