14.1 Replacing the diaphragm
The order no. (part number) of the appropriate diaphragm or the
spare parts kit can be found at the end of the
‘Service’
menu.
n Take protective measures, if necessary.
n Note the material safety data sheet for the feed chemical.
n Prevent the escape of feed chemical.
n Ensure that the system is at atmospheric pressure.
1. Empty the liquid end (turn the liquid end upside down and
allow the feed chemical to run out; flush out with a suitable
medium; flush the liquid end thoroughly when using haz‐
ardous feed chemicals!).
2.
Set up
‘Service
è
Diaphragm replacement
è
To change position’
ð
The pump moves the diaphragm away from the back‐
plate.
Now leave the pump connected to the mains/power
supply so that this state is maintained.
3. Unscrew the hydraulic connectors from the discharge and
suction side.
4. With types with coarse/fine degassing: Firstly remove the
coarse/fine vent valve (grip), then lift off the cover of the
liquid end with a screwdriver.
Fig. 40: Partially exploded view of the liquid end
1 Screws
2 Dosing head
3 Diaphragm
4 Backplate
5 Safety diaphragm
6 Pump housing
5. Remove the screws (1).
6. Remove the dosing head (2) plus screws (1) from the pump -
see figure
7. Loosen the diaphragm (3) from the drive axle with a gentle
backwards turn in an anticlockwise direction.
8. Fully unscrew the diaphragm (3) from the drive axle.
9. Remove the backplate (4) from the pump housing (6).
10. Check the condition of the safety diaphragm (5) and replace
it if necessary.
11. Push the safety diaphragm (5) onto the drive axle only until it
lies flush with the pump housing (6).
Repair
102
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