11.2 Checking and replacing deflector plate
CAUTION!
Chemical may spray out. This may lead to chemical
or other burns. The dosing pump must always be
depressurised and rinsed with water or a suitable
medium before starting any work on the dosing
pump.
The following steps are required to check that the
deflector plate is in perfect condition and replace
it if necessary. Repeat steps 1 - 4 in Section 11.1
"Replacing diaphragm".
The deflector plate
⑤
on the MAGDOS DE/DX
01...12 is accessible after removing diaphragm
insert
④
. The diaphragm insert can be removed
without difficulty by prying it out with two screwdriv-
ers inserted in the recesses of the outer flanges
(see Fig. 1)
MAGDOS DE/DX 20...100 is not equipped with a
diaphragm insert. The deflector plate is accessible
after removing the diaphragm and the support plate
(only on MAGDOS DE/DX20).
Now check condition of the diaphragm.
The deflector plate must be replaced if it is chemi-
cally corroded.
Remove the old deflector plate.
Slide new deflector plate
⑤
on to the diaphragm
rod until it engages in the groove on the diaphragm
rod
⑥
(see Fig. 2)
Now press the diaphragm insert into the flange
and proceed through steps 5 - 10 in Section 11.1
"Replacing diaphragm". (see Fig. 3)
11.3 Valves
The dosing pump valves must be cleaned regularly.
IMPORTANT!
Dirty valves will affect the dosing accuracy.
NOTE!
When screwing the valves into the dosing head, tighten to a torque of 2 Nm +10 % and -20 %.
CAUTION!
Chemical may spray out. This may lead to chemical or other burns. The dosing pump must always be
depressurised and rinsed with water or a suitable medium before starting any work on the dosing pump.
DN3 and DN4 valves are pre-assembled units which can be removed from the
dosing head without disintegrating into their individual components. To disas-
semble the valves, use a screwdriver with a 10 mm bit.
①
Valve body,
②
screw-in valve plug
①
②
26
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