Sigma S2Ba Betriebsanleitung PDF herunterladen (Seite 36)

10.2 Replacing the metering diaphragm

Third party spare parts for the pumps may lead to problems

when pumping.

–

Use only original spare parts.

–

Use the correct spare part kits. In case of doubt, refer to

the exploded views and ordering information contained

in the "Supplementary information CD for ProMinent

pump operating instructions".

Personnel:

Technical personnel

Requirements:

n If necessary take protective measures.

n Observe the safety data sheet for the feed chemical.

n Depressurise the system.

1. Empty the liquid end: Place the liquid end on its head and allow the

feed chemical to run out; flush out with a suitable medium; flush the

liquid end thoroughly when using hazardous feed chemicals!

2. With the pump running, move the stroke adjustment dial to the stop

at 0 % stroke length.

The drive axle is now difficult to turn.

3. Switch off the pump.

4. Unscrew the hydraulic connectors on 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. Loosen the diaphragm from the drive axle with a gentle backwards

turn in the anti-clockwise direction.

9. Completely unscrew the diaphragm from the drive axle.

10. Tentatively screw the new diaphragm anticlockwise up to the stop

on the drive axle.

The diaphragm now is now seated against the stop of the

thread while the diaphragm flap is within the tolerance range.

P_SI_0029

Fig. 25: Tolerance range of the flap on the backplate

1 Diaphragm

2 Backplate

3 Flap

A Tolerance range

11. Should this not work, remove dirt or swarf out of the thread and

screw the diaphragm correctly onto the drive axle this time.

Repairs

1 2 ... 31 32 33 34 35 36 37 38 39 40 41 ... 51 52

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