Diaphragm liquid pump NF 30, NFB 30
Troubleshooting
KNF Flodos AG BA_NF30_EN_05_069206.docx
Translated from the Original Operating and Installation Instructions
26
Flow rate, suction head or pressure head is too low
The pump does not achieve the technical performance data stated on the data sheet.
Cause
Fault remedy
Components in the system
connected to the suction and
pressure sides, such as hoses,
valves or filters, are causing too
much resistance.
➔
Modify installation, check the cross-section of components.
Hose connections are not leak-
tight.
➔
Secure transition joints between hose and hose connections
with clamps or clamping elements
Particles in the pump.
➔
Clean the pump head, install suction-side filter if required
(see Section 8.2).
Viscosity of the liquid is too
high.
➔
Contact KNF.
Incorrect interchange of outlet
and inlet line connections .
➔
Remove outlet and inlet lines and re-connect correctly.
The head parts are not media-
resistant.
➔
Replace the pump head with a compatible version.
Tab. 17
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 8.2.1).
2. Dismantle the pump.
3. Clean the pump (see Section 8.2.2).
4. Send the pump, with completed decontamination statement
(see Chapter 10), to KNF customer services stating the nature
of the pumped medium.
