3.5
How not to install
Fault description Cause Remedy
The suction line cannot be
bled.
A pocket of air (arrow) is in the
suction line.
Prevent the air pocket or install as shown in
Ä ‘With
high suction-side pressure 1’ on page 15
.
Fault description Cause Remedy
Feed chemical flows uncontrolled
when the line is filled.
Siphon effect by discharge
line falling too deeply.
Interrupt the discharge line, as in
Ä ‘With high
suction-side pressure 2’ on page 15
Fault description Cause Remedy
feed chemical
presses through the
liquid end.
The suction-side priming pressure is too high
caused by the negative pressure difference
between the discharge and suction side.
Install as shown in
Ä ‘With high suction-side
pressure 3’ on page 15
or
Ä ‘With high suc‐
tion-side pressure 3’ on page 15
.
Fault description Cause Remedy
The suction line can pull off. The overflow line is routed back to the suction line, which is
secured with a foot valve or can be blocked.
Install as in
Fig. 13.
The metering pump meters the
feed chemical in a cycle.
The overflow line is routed back to the suction line, whereby the
multifunctional valve possibly no longer closes after being
opened.
Install as in
Fig. 13.
Fig. 16
Fig. 17
Fig. 18
Installation, hydraulic
14
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