AZURA Pump P 2.1L user manual

44 Maintenance and Care
Attaching capillaries Process Figure
3. Using an open-end
wrench, hold the inlet
fitting 5 in place.
4. Tighten the fitting 4 at
the pump head.
5. If the capillary cannot
be screwed tight, then
use a new clamping
ring!
Maintaining the Check Valves
Dirty check valves do not properly open and close. They cause
pressure fluctuations and irregular flow. If it is impossible to
clean the check valves, replace the whole unit.
Prerequisite � Pump head has been flushed.
� Capillaries are disconnected.
� Pump head has been dismounted.
Procedure � Unscrew the outlet and inlet fittings.
� Remove the check valve.
� Insert the check valve.
� Screw in the outlet and inlet fittings.
Tools � Open-end wrench, sizes 10, 17
Removing the Check Valves
Process Figure
6. Unscrew the outlet fitting
1.
7. Remove the check valve
2.
8. Unscrew the inlet fitting
3.
9. Remove the check
valve.
Intermediate result Check valves are removed.
Next steps Replace or clean the check valves.
Fig. 40 Pump head
1
2
3
4
5
Fig. 41 Removing the check
valve