5.5 ANTI-SUCTION VALVE
The anti-suction valve ensures that air enters the
heater during the machine cooling phase. In this
way the reduction of water volume due to cooling
does not create decompressions that may give
rise to drawbacks such as the suction of milk
through the steam nozzle.
WHEN TO REPLACE
You can assume that there are no problems with
the anti-suction valve when:
A There is a strong smell of rot when making
steam or water is extracted from the heater.
B The water leaving the heater is dirty.
In these cases the valve is closed and is locked in
this condition.
If the valve blocked open because of limestone
the signs would be:
A
A continuous slight whistling sound coming
from the valve.
B Condensation drops near the valve.
HOW TO REPLACE
Using a 19 mm cup hex wrench unscrew the valve
from its housing.
When inserting the new one, coat the threads with
Teflon tape or with a few drops of Loctite.
NOTE
We suggest that the valve be replaced annu-
ally to ensure proper function and excellent
sealing.
Edition 01 of 08/2017
5.8
SERVICE MANUAL
Fig. 128
Fig. 129
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