9
FIAT PANDA 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 multiple valve
assembly 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;
– the optimum engine conditions are sat-
isfied (engine coolant temperature, mini-
mum revs level) for running on LPG;– there is enough LGP in the tank for op-
eration;
– the inertia switch has not been tripped.
The multivalve 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 opera-
tions;
– 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 PANDA 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 solenoid valve on
the tank. 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. 4F0G0805m
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 value.
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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