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12.3
Replacing the diaphragm
Third-party spare parts for the pumps can lead to problems when
pumping.
Only use original spare parts.
n
Use the correct spare parts kits. If in doubt, refer to the exploded
n
views and order information in the appendix or on our website
www.prominent.com.
Personnel:
n
Requirements:
Put in place protective measures, if necessary.
n
Note the material safety data sheet for the feed chemical.
n
Ensure that the system is at atmospheric pressure.
n
1.
Drain the liquid end: turn the liquid end upside down and allow the
feed chemical to drain; use a suitable medium to thoroughly flush
the liquid end.
2.
With the pump running, move the stroke adjustment dial to the stop
at 0% stroke length.
ð The drive axle is now difficult to turn.
3.
Switch off the pump.
4.
Unscrew the hydraulic connectors from the discharge and suction
side.
5.
Unscrew the diaphragm rupture sensor from the dosing head.
6.
Remove the 6 screws on the dosing head.
7.
Remove the dosing head.
8.
Check the condition of the diaphragm rupture sensor - see
Ä 'Checking the condition of the diaphragm rupture sensor'
on page 50 .
9.
Loosen the diaphragm from the drive axle with a gentle backwards
turn in an anti-clockwise direction.
10.
Completely unscrew the diaphragm from the drive axle.
11.
Tentatively screw the new diaphragm anticlockwise up to the stop
on the drive axle.
ð The diaphragm is now seated at the stop of the thread while the
diaphragm flap is within the tolerance range.
3
A
Fig. 22: Tolerance range of the flap on the backplate
1
Diaphragm
2
Backplate
3
Flap
A
Tolerance range
Technical personnel
Repair
1
2
P_SI_0029
49
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