13
3. Installation
General instructions for installation of
backwater valves
According to DIN EN 12056 it is not allo-
wed to connect all drainage fixtures from
a building (including those located above
the backwater level – ground level) through
a backwater valve. The reason being that
when the backwater flap is in the closed
position due to backwater / flooding no
wastewater will be able to flow through the
backwater valve meaning that the building’s
own wastewater will flood out of the lowest
drainage fixture connected (normally in the
basement) to the backwater valve.
Incorrect installation of a backwater valve
Correct installation of a backwater valve
DIN EN 12056 specifically states that only drainage fixtures below
the backwater level may be connected to a backwater valve. All
drainage fixtures above the backwater level should be drained
through a separate pipe directly into the sewer (not through the
backwater valve). This means that the home / building must be
equipped with separate drainage pipes.
A building’s wastewater from above the backwater level (above
ground level) can drain freely into the sewer at all times. During
backwater the higher head / pressure of wastewater above the
backwater level will force its way into the surcharged sewer and will
not flood the basement / lower levels. Rainwater drainage pipes
must not be connected to a backwater valve.
Right
Backwater valve
Sewer
Backwater valve
Sewer
Backwater
level
Wrong:
Backwater
level
Please note:
DIN EN 12056 requirements should be clo-
sely followed during the planning and ins-
talling of drainage pipes! Vertical draina-
ge pipes connected to a backwater valve
should not be connected directly in front
of or directly behind the Staufix FKA but
should be connected at least 1 meter before
or after the backwater valve – this is the so
called ‘wastewater calming’ area. A back-
water valves should also be installed so that
access to the valve for service, maintenan-
ce or repair is possible.
Caution:
Make sure that the backwater
valve is installed in the proper direction and
is not installed backwards. KESSEL back-
water valves are equipped with flow direc-
tion arrows to make sure that the valve is
installed in the proper direction.
3.1 Concrete slab installation of Stau-
fix FKA
The Staufix FKA body should be installed
perfectly horizontal (please see illustration
1). The electrical cables for the backwater
flap motor and the optical sensor should
be laid in a conduit (minimum conduit size
DN 50 (2 inch), KESSEL recommends not
using 90 degree bends – maximum 45 de-
gree bends) (see Illustration 2). This con-
duit should be connected to the conduit
connection hole on the side of the Stau-
fix FKA body. The included gasket should
be placed into the recessed area of the
housing (as shown in illustration 3) and then
the upper portion of this gasket should be
lubricated. The included upper section can
then be inserted into the housing as seen
in illustration 4. This upper section can be
tilted up to 5 degrees and can be rotated
to match floor / tile patterns. It can also
be vertically adjusted to meet the required
cover installation height. After adjusting the
upper section make sure that the gasket
between housing base and upper section
is still in the proper position.
Caution:
In the case that a shallow instal-
lation is required in a concrete floor slab it
may be necessary to shorten the upper sec-
tion which can be done by sawing off the
required lower portion of the upper section.
It is important that when the upper section
is in its final position that the conduit access
still is free so that in the future electrical
cables can be pulled out or insert into the
conduit as required (see Illustration 5).
Provide a cable tube for later retrofitting. If
this cable tube has to be installed in the
upper section, drill a hole with the KESSEL
hole saw (article number 500101) or a stan-
dard Ø 60 mm hole saw and put in the pipe
sealing gasket (article number 850114)
.
The second gasket must be inserted in the
cover. Important is that the sealing lip and
centering tip are pointing up. The centering
tip is to be inserted in the appropriate reces-
sed area as seen in illustration 5. During in-
stallation the valve should remain clean and
DN50
Ill. 1
Ill. 2
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