Troubleshooting
Swing Piston Pumps NPK 09
20
Translation of original Operating Instructions, English, KNF 121576-121579 11/20
Flow rate, pressure or vacuum too low
The pump does not achieve the output specified in the Technical data or the data sheet.
Cause
Fault remedy
Condensate has collected in
pump head.
➔
Install pump at highest point in system.
There is gauge pressure on
pressure side and at the same
time vacuum or a pressure
above atmospheric pressure on
suction side.
➔
Change the pressure conditions.
Pneumatic lines or connection
parts have an insufficient cross
section.
➔
Disconnect pump from system to determine output values.
➔
Eliminate throttling (e.g. valve) if necessary.
➔
Use lines or connection parts with larger cross section if
necessary.
Leaks occur on connections,
lines or pump head.
➔
Eliminate leaks.
Connections or lines completely
or partially jammed.
➔
Check connections and lines.
➔
Remove the jamming parts and particles.
Head parts are soiled.
➔
Clean head components.
Piston seal or valve plates are
worn.
➔
Replace piston seal and valve plates (see Chapter 8)
Tab. 15
Fault cannot be rectified
If you are unable to determine any of the specified causes, send
the pump to KNF Customer Service (see last page for the ad-
dress).
1. Flush the pump to free the pump head of dangerous or ag-
gressive gases.
2. Remove the pump
3. Clean the pump
4. Send the pump, together with completed Health and Safety
Clearance and Decontamination Form to KNF stating the na-
ture of the transferred medium.
Summary of Contents for NPK 09
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