GV 640 Service Manual 77
For internal use only
8.2 Free flow section
The free flow section is a water curve with an opening. The curved shape accelerates the water so that
it flows past the opening.
This ensures that virtually no water flows through the opening, even when the water pressure is low.
This measure is prescibed by the “Deutsche Vereinigung des Gas- und Wasserfaches” (DVGW-German
Association of Gas and Water).
If a vacuum develops in the water pipe water may
flow from the diswasher into the system of water
pipes in a most unfavourable case.
Only air is drawn into the opening in the flow sec-
tion so that water is prevented from flowing back.
Flow course in the free flow section
1 Air balance opening
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