Swing Piston Pumps NPK 25
Troubleshooting
Translation of original Operating and Installation Instructions, english, KNF 121581-121584 08/16
17
The pump does not achieve the output (flow, pressure or vacuum) specified in the Technical
data or the data sheet
Cause
Fault remedy
Head parts are soiled.
Clean head components.
Piston seal or valve plate is
worn.
Change piston seal and valve plate (see section 8.3).
Tab. 12
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 gases.
For this purpose, flush the pump under atmospheric condi-
tions some minutes with air (if necessary for safety reasons:
with an inert gas).
2.
Remove the pump.
3.
Clean the pump (see Section 8.2)
4.
Send the pump, together with completed Health and Safety
Clearance and Decontamination Form (Chapter 12), to KNF
stating the nature of the transferred medium.
