Neptune NXP-M Operating Instructions Manual page 38

Stepper motor-driven diaphragm dosing pump NXP-M and NXP-P
13.1.7 Diaphragm is torn or tears too often
Possible cause
Shut-off valves closed.
Pressure peaks due to
acceleration with long suction
lines.
The materials are not suitable
for the dosing medium being
used.
Diaphragm not screwed up to
the end stop on the dia-
phragm rod.
System backpressure too
high (measured at discharge
connection of dosing pump).
Media sediment in dosing
head.
Table 35: Type of fault: Diaphragm is torn or tears too often
Troubleshooting
38
Type of fault
Remedy
è
Open the shut-off valves. Inspect
the dosing pump for possible
damage.
è
Install a suction pressure
regulator.
è
Check the resistance of the
materials.
è
Screw a new diaphragm up to the
end stop.
è Clean blocked injection nozzle.
è
Install pulsation dampeners to
reduce pressure peaks if pipes
are too long.
è
Check function of safety valves.
è
Clean the dosing head.
Operating instructions