7
FIA
T DUCA
TO NA
TURAL POWER
2) Mechanical excess pressure device
(Burst Disk),
in the event of excess pres-
sure (above 330 bar), it ensures that the
methane escapes as quickly as possible in
a controlled manner.
3) Excess flow,
it intervenes if the piping
is broken limiting the flow of methane to
values that are not dangerous.
The flow restrictor valve is located to al-
low it to operate even if the solenoid valve
casing is broken due to an impact.
SOLENOID
VALVES/SAFETY
DEVICES
The solenoid valves
Fig. 2
are bolted di-
rectly onto the methane canisters with the
main function on interrupting the flow of
methane to the supply circuit.
The solenoid valves are open when:
❒
the pressure in the canister is sufficient
for operation;
❒
the engine is running;
❒
the inertia switch has not been trig-
gered.
The solenoid valve assembly is equipped
with the following safety devices:
1) Fuse pad,
in the case of overheating
(temperature above 110 °C), it totally
eliminates the danger of excess pressure
making the methane in the canister flow
out as quickly as possible in a controlled
manner.
4) Manual tap,
it is located upstream of
the solenoid valve.
This separates the canister from the
methane system to allow maintenance op-
erations.
The taps can be accessed from outside the
vehicle, and are positioned on the left-
hand side.
To close the taps
A - Fig. 3
: turn the knob
in the direction (
1
) shown by the arrow
(clockwise
OFF
)
To open the taps
A - Fig. 3
: turn the knob
in the direction (
2
) shown by the arrow
(anti-clockwise
ON
)
fig. 2
F0N04000m
fig. 3
F0N0393m
603_83_954 Ducato Nat Power GB 25-03-2009 15:03 Pagina 7
