Fault description Cause Remedy
feed chemical
presses through the
liquid end.
The suction-side priming pressure is too
high due to the negative pressure differ‐
ence between the discharge and suction
side.
Install as shown in
Ä ‘With high suction-
side pressure 3’ on page 26
or
Ä ‘With
high suction-side pressure 2’
on page 25
.
Fault description Cause Remedy
The suction line may
tear off.
The overflow line is routed back into the suc‐
tion line, which may be secured or blocked
with a foot valve.
Install as in
Ä ‘Avoid exceeding
maximum permissible operating
pressure’ on page 24
.
The metering pump
meters the feed chem‐
ical in a cycle.
The overflow line is routed back into the suc‐
tion line, whereby it is possible that the multi‐
functional valve no longer closes after being
opened.
Install as in
Ä ‘Avoid exceeding
maximum permissible operating
pressure’ on page 24
.
7.5 Special installation instructions
n Position the end of the discharge line higher than the fluid level
in the storage tank to avoid overstraining.
n Position the outlet of the discharge line higher than the fluid
level in the storage tank.
Fig. 15
Fig. 16
With high suction-side pressure 1
Fig. 17
With high suction-side pressure 2
Fig. 18
Installation, hydraulic
25
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