Interval Maintenance work Personnel
Quarterly*
n Check that the metering lines are fixed firmly to the liquid end.
n Check that the suction valve and discharge valve are correctly seated.
n Check that the dosing head screws are tight
n Check the condition of the metering diaphragm - see
Ä ‘Check the condi‐
tion of the metering diaphragm’ on page 68
.
n Check that the flow is correct: Allow the pump to prime briefly.
n Check that the electrical connections are intact
Technical personnel
* Under normal loading (approx. 30 % of continuous operation).
Under heavy loading (e.g. continuous operation): shorter intervals.
The metering diaphragm is a wear part, the service life of which is
dependent upon the following parameters:
n System back pressure
n Operating temperature
n Feed chemical properties
When using abrasive feed chemicals, the diaphragm service life is
reduced. In such cases, more frequent checking of the diaphragm is rec‐
ommended.
Data Value Unit
Tightening torques for dosing head
screws:
4.5 ... 5.0 Nm
Standard liquid ends:
Check the condition of the metering dia‐
phragm
Tightening torques
Maintenance
68
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