12. Tentatively screw the new diaphragm (3) onto the drive axle up to
the stop - ensure that this is successful, otherwise the pump will
subsequently not meter correctly!
13. Unscrew the diaphragm (3) again.
14. Place the backplate (4) on the pump housing (6).
CAUTION!
– Make sure that the leakage hole points down‐
wards when the pump is subsequently fitted - see
figure in the "Maintenance" chapter!
–
Place the backplate (4) immediately into the cor‐
rect position on the pump housing (6)! Do not twist
the backplate on the pump housing to prevent the
safety diaphragm (5) becoming warped!
15. Place the diaphragm (3) into the backplate (4).
CAUTION!
– Do not over-tighten the diaphragm (3) in the fol‐
lowing step!
– Ensure that the backplate (4) remains in its posi‐
tion so that the safety diaphragm does not
become warped!
16. Hold the backplate (4) firmly and screw the diaphragm (3) in a clock‐
wise direction until it is sitting tightly.
17. Place the dosing head (2) with the screws (1) onto the diaphragm
(3) and the backplate (4) - ensure that the suction connector points
downwards when the pump is in its subsequent fitting position.
18.
Set up
‘Service
è
Diaphragm replacement
è
Back’
ð
The pump moves the diaphragm back to the backplate.
19. Gently tighten the screws (1) and then tighten them diagonally. See
below for the tightening torque.
20. With types with coarse/fine bleed valve: Allow the cover of the liquid
end to rest in the dosing head, then press the grip of the bleed valve
into the coarse/fine bleed valve.
Check the tightening torque of the screws after 24
hours of operation!
Data Value Unit
Tightening torque for screws: 4.5 ... 5.0 Nm
14.3 Cleaning the Diaphragm Rupture Indicator
WARNING!
Warning of unnoticed escaping of feed chemical
After the diaphragm rupture indicator has been triggered, any
residue of feed chemical residues can interfere with it.
– After the diaphragm rupture indicator has been triggered,
clean and test it.
Tightening torque
Repairs
71
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