SSP_373_d1.pdf

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EcoFuel Natural Gas Drive in Touran and Caddy
Natural Gas Supply
Thermal release
The thermal release is also part of the tank shut-off
valve module.
Task
It prevents the natural gas tanks bursting if the
pressure rises excessively because of high
temperatures. The thermal release is installed in such
a way that direct release of the natural gas into the
atmosphere is possible.
Thermal
release
S373_023
How it works
S373_015
Thermal release
The main part of the thermal release is a small glass
tube containing a fluid that seals the gas leak.
At temperatures above 110 °C, the liquid in the glass
tube will expand and cause it to burst.
The gas outlet can now open. The natural gas escapes
from the natural gas tanks into the atmosphere and
can be released there in a controlled manner without,
for example, a backflash occurring or the natural gas
tanks bursting due to high temperatures if the vehicle
is on fire.
Drainage channel
G a s outlet
The glass tube closes the
gas outlet.
Glass tube
Flow outlet
S373_007
The glass tube bursts and
gas can escape.
S373_008
Effect of heat
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Manual shut-off tap
Shut-off tap
(without han d wheel)
The mechanical shut-off tap allows you to close the
natural gas tank manually with a tool so it is gas-tight.
For safety reasons, this is necessary whenever the
natural gas tank is removed or fitted again.
The drainage channel for the thermal release is
also open when the shut-off tap is closed for safety
reasons.
S373_022
S hut-off tap
S373_013
Thermal release
Drainage channel
Shut-off tap
open
Shut-off tap
closed
S373_003, S373_004
Please see ELSA for more detailed information on repair work.
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Natural Gas Supply
From high pressure to low pressure
Gas pressure regulator
The gas pressure regulator is mounted on the
longitudinal member at the front right of the engine
compartment.
Task
The gas pressure regulator has the task of
reducing the natural gas pressure from 200bar to
approx. 6bar.
The relaxation of the natural gas occurs in the gas
pressure regulator in a single pressure reduction
stage.
It thus separates the high-pressure side of the natural
gas system from the low-pressure side.
Gas pressure regulator
S373_031
Fuel tank pressure sensor G400
Design
Coolant connections
Gas input with filter
from natu r al gas tank
The gas pressure regulator is made up of the
following components:
Mechanical
excess pressure
valve
- coolant connections to engine cooling system
- integrated filter on gas input
- fuel tank pressure sensor G400
- high-pressure valve for gas mode N372
- pressure reduction stage
- mechanical excess pressure valve
High-
pressure
valve for gas
mode N372
Pressure reduction
stage
Gas output to
gas fuel rail
S373_035
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The reduction stage on the gas pressure regulator consists of:
- the high-pressure chamber with regulating piston
- the low-pressure chamber with mechanical excess pressure valve
- the diaphragm disc
- the spring
Fuel tank pressure sensor G400
Low-pressure gas
output to engi n e
High-pressure gas input from the
natural gas tanks
Excess pressure valve
Filter
High-pressure
valve for gas
mode N372
High-pressure chamber
Low-pressure chamber
Pressure reduction
stage
Regulating piston
Diaphragm disc
Spring
Low-pressure
section
High-pressure
section
S373_018
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