dosatron D9 - Under dosing; Backflow into the product tank

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SYMPTOM CAUSE SOLUTION
Dosing
Under dosing
Air tightness problem.
1.Check the that the
injection assembly nuts
are correctly tightened.
2.Check the condition of
the suction hose.
3.For IE (external
injection) versions,
check the condition of
the injection hose.
Suction valve seal worn
or dirty.
Clean or replace it.
Overflow (cavitation)
Reduce the flow.
Worn plunger seal Replace it
Scratched dosing pump
body Replace it.
IE model: damage or
lime scale build-up on
the external injection
module and the
injection T-piece.
Check the condition of the
silicone umbrella valves,
the diaphragm and the
duckbill valve. De-scale or
replace if necessary.
Backflow into the
product tank.
Dirty, worn or missing
suction valve or valve
seal.
Clean or replace.
IE model: Damaged
injection module
diaphragm and silicone
umbrella valve.
Replace the diaphragm
and the valve seat.
IE model: Damage or
lime scale build-up on
duckbill valve or silicone
umbrella valves.
De-scale or replace the
duckbill valve and valve
seat.