12. Tentatively screw the new diaphragm (3) onto the drive axle
as far as the stop - ensure that this is successful, otherwise
the pump will not subsequently meter precisely.
13. Unscrew the diaphragm (3) again.
14. Place the backplate (4) onto the pump housing (6).
n Make sure that the leakage hole points downwards when
the pump is in its subsequent fitting position - see figure
in the "Maintenance" chapter.
n Place the backplate (4) immediately into the correct posi‐
tion on the pump housing (6). Do not twist the backplate
on the pump housing to ensure that the safety diaphragm
(5) does not become warped.
15. Place the diaphragm (3) into the backplate (4).
n Do not over-turn the diaphragm (3) in the following step.
n Ensure that the backplate (4) remains in its position so
that the safety diaphragm does not become warped.
16. Hold the backplate (4) firmly and screw the diaphragm (3)
clockwise until it is sitting tightly.
17. Place the dosing head (2) with the screws (1) onto the dia‐
phragm (3) and the backplate (4) - ensure that the suction
connector points downwards when the pump is in its subse‐
quent 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 cross‐
wise. See below for the tightening torque
Ä ‘Tightening
torque’ on page 103
.
20. With types with coarse/fine degassing: Allow the cover of the
liquid end to lock into the dosing head, then press the grip of
the coarse/fine vent valve into the dosing head.
Check the tightening torque of the screws after 24 hours of
operation.
Data Value Unit
Tightening torque for screws: 4.5 ... 5.0 Nm
14.1.1 Replacing the vPTFE diaphragm
The vPTFE diaphragm (full PTFE diaphragm) is replaced in the
same way as the standard diaphragm - see "Repair" chapter.
A fitted vPTFE diaphragm needs to be replaced
once the dosing head screws have been loosened,
as the pump will otherwise no longer be tight.
A spare parts kit contains:
n vPTFE diaphragms
n Suction valve
n Discharge valve
n Connector kit
n Seal
Tightening torque
Spare parts for the vPTFE diaphragm
Repair
103
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