9
FIAT IDEA LPG
SOLENOID VALVES
AND SAFETY DEVICES
The system has a solenoid valve located
on the pressure reduction unit and a so-
lenoid valve fitted inside the multivalve as-
sembly on the tank.
The main function of these solenoid valves
is to interrupt/allow the flow of LPG to
the supply circuit.
The solenoid valves are open when:
– a request to run on LPG has been made;
– optimum engine conditions are satisfied
(engine coolant temperature, minimum
revs level) for running on LPG;– there is enough LPG in the tank for op-
eration;
The multiple valve assembly fitted on the
tank includes:
– a valve that automatically stops the sup-
ply of LPG when the maximum permitted
filling level is reached (80% of the total
tank capacity);
– a flow limiter which, if a pipe is broken,
prevents the complete and sudden escape
of LPG;
– a one-way valve, located on the gas re-
turn pipe in the tank, which prevents LPG
reflux;
– a safety solenoid valve on the LPG sup-
ply, which either gives the go ahead or
prevents the escape of gas to the pressure
reduction unit; – a manual tap, upstream of the solenoid
valve, that separates the tank from the
LPG system to allow maintenance work;
– a fuse pad which, in the event of
overheating (temperature above 120°C),
totally eliminates the danger of excess
pressure making the LPG in the tank flow
out as quickly as possible in a controlled
manner;
– an analogue gauge showing the level of
LPG in the tank.
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10
FIAT IDEA LPG
REGULATION UNIT
The regulation unit fig. 4includes:
– cut out solenoid valve with gauze filter;
– pressure regulator.
The cut out solenoid valveopens or
closes together with the tank solenoid
valve. It closes each flow of LPG when the
engine is not running on gas.
It also acts as a safety device that prevents
the flow of LPG if the inertia switch is ac-
tivated.
fig. 4F0H0776m
The pressure regulatorallows the
change of the LPG from a liquid state to
a gaseous state via a dilation chamber and
maintains the pressure required for the
operation of the system at a preset val-
ue.
PIPING
The piping for the LPG in a liquid state
(from the filler to the tank and from the
tank to the pressure regulator) is made
from copper and coated in plastic.
The piping for the LPG in a gaseous state
(from the pressure regulator to the LPG
injectors) is made from rubber.
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