Philips HD 8930, Service Manual

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NEW ROYAL 04 OPERATING LOGIC
Saeco International Group Rev. 00 / July 2011 Page / 07 03
4.4. Relief valve
W
ater
enteri
ng
from
the
boil
er
Drain to drip tray
Functions:
Safety valve : functions as a safety valve by opening towards the drain in the event that the pressure rises above
16-19 bar
Filling the circuit
: The solenoid valve opens (drain position) and the pump is activated, automatically refilling the
circuit by expelling the air in the pipe
Unit discharge
: before the unit descends it opens briefly, discharging the pressure created to prevent spraying and
making the dregs drier
Coffee beverage
: when a coffee beverage is selected, the pump is charged briefly during the grinding process and
the valve assumes the drain position in order to fill the pipes with hot water.
Needle
Drain