Solenoid diaphragm pump
Series R/RS 204.1
Operating Instructions
TA 416
Rev.
11 en
04/2013
Subject to technical modifications!
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8.1.2
Prevent a backflow of the pumped
medium
if the dosing line is linked with a main line:
install an injection fitting (dosing valve).
Main pipe
Injection fitting
Dosing line
Shut-off valve
Container
Suction line
Fig. 18 Installing an injection fitting
CAUTION !
The contents in the dosing line is mixed unintentionally if
a backflow from the main pipe is not prevented.
CAUTION !
Note / avoid chemical reactions during a backflow.
8.1.3
Eliminate undesired siphoning
when dosing into a main line with negative pressure:
install a pressure keeping valve in the dosing line.
CAUTION !
When installating the pump it is to be ensured that an ex-
cess supply (due to a positive pressure difference (> 1
bar) between pressure and suction side) is avoided.
Main pipe
Injection fitting
Pressure line
Pressure keeping valve
Container
Suction line
Shut-off valve
Fig. 19 Installing a pressure keeping valve
