4.1 Cleaning of the flood water shut-
off valve and single flap back-
water valve every six months
The flood water shutoff valve and single
flap backwatervalveshouldbecleanedby
theoperatororarepresentativeoftheope-
rator at least every six months. The proce-
dure is as follows:
• Undo the nuts on the cover and remove
the cover.
• Remove the insert(s) and/or the flap
• Clean all parts
• Checksealsandsealingsurfaces(and fit
new ones if required. Use KESSELorigi-
nal parts.)
•Apply grease to the outside of the seals
for the insert and to the guide for the flap
valves
• Reinsert housings accurately
• Replace the cover and tighten nuts, wor-
king diagonally (max. tightening torque 8
Nm)
backwater valve every six
months by a specialist
According to DIN 1997 industrial stan-
dard, backwater valves must be serviced
by a specialist at least every six months.
No sewage should be allowed into the
backwater valve during servicing.
The servicing work to be carried out includes
the cleaning specified in 4.1 and the following
operationalcheckinaccordancewithDIN1986:
• Undo the nuts on cover (4). Remove
cover
•Apply lubricant to the seal on the additio-
nal test valve insert (6) and push insert
into outlet opening
• Fill the opening between the two flaps
with water
• Replace the cover (4), tighten the nuts,
working diagonally (max. tightening tor-
que 8 Nm)
• Remove
1
/
2
“ screw plug (8) from the
cover and screw in funnel (7).
the cover (4) to the „OPEN“ position.
• Fill the funnel (7) with water to a depth of
100 mm.
• Observe the depth of water in the funnel
for 10 minutes and top it up to maintain
the level if required.
•
The backwater valve is considered to be
watertight if no more than 500 cm
3
of
water has to be added during this time.
• Removefunnel.Screwthescrewplug(8)
with seal back into the cover (4)
• Undo the nuts of the cover and remove it
• Remove the additional test valve insert
(6) from the outlet opening.
• Replace the cover (4) and tighten the
nuts,workingdiagonally(max. tightening
torque 8 Nm)
The KESSEL single flap backwater valve
can easily be converted to a backwater
valve that meets DIN 1997 standard by
using the additional „push-fit“ housing with
flap and the „locking cover“.
TheKESSELfloodwatershutoffvalvecan
be converted to a backwater valve that
meets DIN 1997 using an additional insert
housing with flap.
The following spare parts are available for
the double flap backwater valve, flood
water shutoff valve and the single flap
backwater valve:
Order No. DN 100 DN 125 DN 150 DN 200
Double flap backwater valve 73 100 73 125 73 150 73 200
Flood water shutoff valve 72 100 72 125 72 150 72 200
Single flap backwater valve 71 100 71 125 71 150 71 200
Cover for body (5) 70 101 70 126 70 151 70 201
Locking cover (4) 70 103 70 128 70 153 70 203
Expanding tube - backflow flap (3) 70 104 70 129 70 154 70 205
Insert - backflow flap (2) 70 105 70 130 70 155 70 205
Seal for cover 70 102 70 127 70 152 70 202
Staufix
®
flap gasket 70 107 70 131 70 156 70 207
Staufix
®
insert seal 70 108 70 132 70 157 70 208
Insert - test valve (6) 70 110 70 134 70 159 70 213
Test funnel (7) 70 214 70 214 70 214 70 214
➅➃
➆
➇
5. Conversions, spare
parts and accessories
6
