A return line is also connected in addition to the suction and pres‐
sure line.
1.
Attach the hose line to the return hose sleeve or to the liquid
end vent valve. PVC hose, soft, 6x4 mm is recommended.
2.
Feed the free end of the return line into the supply tank.
3.
Shorten the return line so that it is not immersed in the feed
chemical in the supply tank.
8.1.3 Installation with metering pumps with self-degassing (SEK type)
CAUTION!
– All the installation and safety information for
metering pumps without self-degassing also
applies.
– Do not exceed the maximum values for priming
lift, priming pressure and viscosity of the feed
chemical.
– Do not allow the suction side line cross-section
to exceed the line cross-section on the suction
valve.
Information about priming pressure
n
Make sure that the pressure in the return line is at least equal
to the priming pressure on the suction side.
n
Priming pressure in the return line restricts the degassing func‐
tion.
n
However, operation with priming pressure in the return line and
atmospheric pressure on the suction side is possible.
A return line is also connected in addition to the suction and pres‐
sure line.
n
The return line is connected to the vertical valve on the upper
side of the liquid end. It is factory-labelled with a red sleeve -
‘Installation of the return line’ on page 26.
n
The pressure line is connected to the horizontal valve.
1.
Attach the hose line to the return hose sleeve or to the liquid
end vent valve. PVC hose, soft, 6x4 mm is recommended.
2.
Feed the free end of the return line into the supply tank.
3.
SEK only: Insert the return line into the anti-kink device on
the vent valve and pull it downwards until it engages in the
anti-kink device.
INFORMATION: The anti-kink device prevents the return line
from kinking, avoiding the risk of self-degassing failure.
4.
Shorten the return line so that it is not immersed in the feed
chemical in the supply tank.
Installation of the return line
Safety information
Installation of the return line
Installation, hydraulic
26
