ENGLISH
30
TECHNICAL MANUAL
8.8 Valves unit
Valves are devices the, function of which is to guarantee safety and correct operation
of the machine.
Pressure limiting valve (safety valve)
The pressure limiting valve guarantees that the pressure inside the boiler does not
exceed
2 bar
.
If this valve fails, the valves capacity is such as to be able to discharge all excess
pressure from the boiler.
Check valve
It consists of an expansion and a check valve.
expansion valve: the cold water sent to the pump in the heat exchangers gets hot.
This heating causes an increase in the volume of water. To limit pressure rises in
the hydraulic circuit, the valve limits the maximum pressure inside the circuit to 12
bar.
check valve: its job is to avoid water flowing back from the exchangers to the
hydraulic circuit.
Antidepression valve
The job of the antidepression valve is to avoid the recall of liquids through the steam
spout while they are heating up. It also eliminates the air inside the boiler when the
machine is warming up.
8.6 Checking pressure
This is used to turn the heating elements on or off according to the
pressure reached inside the boiler. Regulation pressure can vary from a
minumum of 0.5 bar to a maximum of 1.4 bar.
8.7 Anti-flooding device
If any water leaks from the machine, due to a malfunction, etc., thanks to
the cover installed on the pressure limiting device, this water can be
collected and sent to the drainage tray through the relative pipe.
The contacts inside the machine are subject to oxidation. We recommend
cleaning them regularly with an antioxidant spray.
Calibrate the pressure switch while the machine is working, regulating
pressure with the relative screw on the component (
1
).
attention
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