7
Subject to technical alterations
ACO Haustechnik
0 1 7 3 . 0 2 . 5 9 G
1. Flap - open -:
Flap open (normal condition), water drains off, the valve closes
automatically in the case of backflow.
Fig. 4.1
1. Flap - open -
2. Flap - closed -
2. Flap - closed -:
Flap closed, water cannot drain off.
3
Installation
Drainage objects lying above the backflow level (fig. 5) must not drain
via a backflow safety valve. In this case, wastewater accumulating
above the backflow level could not be drained anymore in case of back-
flow. Because of the principle of communicating pipes, the wastewater
would escape from the lowest drain points below the backflow level and
flood the cellar.
For this reason, all drainage objects fitted above the backflow level have
to be connected behind an anti-flood protection system (fig. 6). In the
case of backflow, the downpipe fills up to road level at the most, the
anti-flood protection system prevents the wastewater from drawback in
lower drainage objects and it thus escapes via the manhole covers.
The ACO cleaning pipes/anti-flood protection systems are excellently
suited for refurbishment as they only have a minimum proper gradient of
12 mm. The anti-flood protection systems must be fitted in the pipe
gradient, the proper gradient is a result of the product construction.
3.1 Installation site
3.2 Gradient
2.8 Diagram of the emergency seal
Incorrect
Correct
Fig. 5
Fig. 6
If the pipe gradient is not sufficient, the anti-flood protection system
must not be fitted with an inclination (counter gradient), as faults may
occur.
Horizontal installation
Installation with counter gradient
CORRECT
INCORRECT
Fig. 4.2
Click!
