SIMDOS diaphragm metering pump
Troubleshooting
KNF Flodos BA_SIMDOS_EN_02_160044.docx
Translation of original operating manual
43
Low flow rate, pressure or vacuum
Pump output not in accordance with technical data or performance specifications in data sheet.
Possible cause
Corrective action
Presence of positive pressure
on the pressure side with
simultaneous vacuum or
positive pressure on the suction
side.
Change pressure conditions.
Cross-section of hydraulic lines
or connectors too narrow or
constricted.
Disconnect the pump from the system and determine output
values.
Remove constriction (e.g. valve) if necessary.
If applicable, use larger-diameter lines or connectors.
Leaks in connections, lines or
pump head.
Eliminate leaks.
Connections or lines completely
or partially obstructed.
Check connections and lines.
Remove any parts or particles causing blockages.
Soiled pump head components.
Clean head components.
Worn diaphragm or valve plates
/ seals.
Replace diaphragm and valve plates / seals (see section
9.3).
Materials chemically damaged
by pumped media.
Select suitable resistant material type (see section 11.1).
Tab. 26: Low flow rate, pressure or vacuum
Fault cannot be rectified
If you are unable to identify any of the above causes, please send
the pump to KNF customer services (see address on last page)
1. Flush the pump to clear the pump head of any hazardous or
aggressive fluids (see section 9.2.1).
2. Dismantle the pump.
3. Clean the pump (see section 9.2.2).
4. Send the pump, with completed decontamination statement
(see Chapter 12), to KNF customer services, stating the
nature of the pumped medium.
