6.5.4.1 GVU-ED
This closed design Figure 6-5 has pipes with double walls installed in a gas-tight area. This gas-
tight area has continuous and sufficient airflow. This design can be safely installed in engine
rooms. There is no danger of gas release. The design is in proportion to the bore dimensions of
your engine and your cylinder configuration.
Fig 6-5 GVU-ED
The air vent connects to an extractor fan to move air from the gas-tight area. The dimensions of
the extractor fan are sufficient to replace the necessary volume of air in the gas-tight area and
the double wall pipes. The extractor fan keeps a constant negative pressure in the gas-tight
area. This negative pressure is monitored.
To make sure that the airflow is sufficient, the ventilation system of the GVU-ED must operate
independently from all other ventilation systems.
Gas detectors constantly monitor the double wall pipes and the GVU for concentrations of gas.
If gas is found, the safety system activates a mode change to diesel operation. The gas
pressure is released and inert gas flows inside the pipes.
The GVU-ED has an integrated control panel.
6.5.4.2 GVU-OD
This open design Figure 6-6 does not have a closed area or pipes with double walls. This
design is installed externally in an isolated room with sufficient airflow like for example a gas
valve room. The design is in proportion to the bore dimensions of your engine and your cylinder
configuration.
X92DF
AA00-8014-00AAA-042A-A
Operation Manual Gas valve unit and external gas supply system
Winterthur Gas & Diesel Ltd.
- 279 - Issue 002 2020-08
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