Under heavy loading (e.g. continuous operation, abrasive or
aggressive media): Shorter intervals. ProMinent generally recom‐
mends using a diaphragm rupture indicator.
** Check the metering diaphragm more frequently with feed chemi‐
cals that put particular pressure on the diaphragm, e.g. those con‐
taining abrasive additives.
Fig. 17: The leakage hole
Interval Maintenance work
Quarterly* In addition:
n Check that the bypass line is fixed firmly to the liquid end.
n Check that the vent valve is tight.
n Check the discharge and bypass line for kinks.
n Check that the vent valve is operating correctly.
* with 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:
Tightening torque
Maintenance
45
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