Fig. 39: The leakage hole
Interval Maintenance work Personnel
Annually*
n Check the diaphragm for damage - refer to "Repair"
Technical personnel
* Under normal loading (approx. 30% of continuous operation).
Under heavy-duty loading (e.g. continuous operation): Shorter
intervals.
Check the metering diaphragm more frequently or use a dia‐
phragm rupture indicator with feed chemicals that put particular
pressure on the diaphragm, e.g. those containing abrasive addi‐
tives.
Interval Maintenance work
Quarterly*
n Check that the bypass line is fixed firmly to the liquid end.
n Check that the bleed valve is tight.
n Check the discharge and bypass line for kinks.
n Check that the bleed valve is operating correctly.
* Under normal loading (approx. 30% of continuous operation).
Under heavy loading (e.g. continuous operation): Shorter intervals.
Data Value Unit
Tightening torque for screws: 4.5 ... 5.0 Nm
Liquid ends with bleed valve - addi‐
tionally:
Tightening torque
Maintenance
100
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