Servicing
Diaphragm pump N85, N86
28
Translation of original Operating and Installation Instructions, english, KNF 121258-121528 01/20
9.3. Replacing the diaphragm and valve plates
9.3.1. N85.3K_E and N85.3K_DC
Pump disconnected from mains and de-energized.
Pump is clean and free of hazardous materials.
Hoses removed from pump’s pneumatic inlet and outlet.
Spare part/tool
Quantity
Service Set*
1
Phillips screwdriver no. 1
1
Felt-tip pen
1
Tab. 17
*according to Chapter 11
Diaphragm and valve plates/sealings are the only parts of the
pump subject to wear. They are simple to change.
Always change valve plates/sealings and diaphragm on both
heads at the same time. If the diaphragm and the valve
plates/sealings are not changed at the same time the nominal per-
formance of the pump is not guaranteed after the servicing.
WARNING
Dangerous substances in the pump can
cause a health hazard.
Depending on the substance transferred, caustic
burns or poisoning are possible.
Wear protective clothing if necessary, e.g. pro-
tective gloves.
Flush the pump before replacing the diaphragm
and valve plates/sealings (see Chapter 9.2.1).
CAUTION
Danger of burns from hot pump parts
The pump head or motor may be hot even after the
pump has been shut off.
Allow the pump to cool off after operation.
Change the diaphragms and valve plates/sealings in the following
sequence:
a.)
Preparatory steps
b.)
Remove pump head
c.)
Change diaphragm
d.)
Change valve plates/sealings
e.)
Refit pump head
f.)
Final steps
Except for the preparatory and final steps, perform and finish all
work on one pump head before working on the second pump head.
Requirement
Spare parts/tools
Information on procedure
