Multi-layer diaphragm pump
Serie 409.2 ML
Operating instruction
22
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Technical modifications reserved!
TA 431
Rev.
8 en
06/2015
8.1.6
How to avoid an emptying of the
suction line
•
Install a foot valve at the end of the suction line if the
pump is installed at a higher level than the maximum fluid
level in the tank.
Based on calculations, the dimension ‘
H
’ may not exceed the
number that is equal to the specified maximum suction height
of the pump divided by the density of the dosing medium and
under consideration of mass acceleration and viscosity of the
medium.
Pressure line
Multi-layer
diaphragm pump
Suction lance / -line
H
Tank
Foot valve
Fig. 26 How to avoid an emptying of the suction line
8.1.7
Line strainer
•
Connect the suction line slightly above the bottom of the
tank and install a line strainer (0.1 – 0.5mm aperture size
– depending on nominal width of the valve).
Tank
Multi-layer
diaphragm pump
Pressure line
Shut-off fitting
Line strainer
Suction line
Fig. 27 Installation of a line strainer
CAUTION!
Pump and system may malfunction if contaminates are
not collected.