Servicing
Diaphragm pump N922 EX
32
Translation of Original Operation and Installation Instruction, english, KNF 313600 11/19
9.2 Cleaning
9.2.1 Flushing the pump
WARNING
Risk of explosion by flushing the pump with air
à
In potentially explosive areas or when using
the pump with explosive media, only permit
specialist to flush the pump with inert gas.
à
Before switching off the pump under atmospheric conditions, flush for
several minutes with inert gas.
If there is no risk of explosion, flushing can also be performed with
air.
9.2.2 Cleaning the pump
WARNING
Risk of explosion from electrostatic charging of the
components
à
Only clean the pump with a damp cloth.
à
Only clean the pump with a damp cloth and non-flammable cleaning
agents.
à
If compressed air is present, blow out the components.
9.3 Replacing diaphragm and valve plates/seals
Requirements
à
Disconnect the motor from mains and ensure that it is voltage-free.
à
Clean the pump and free the pump of hazardous materials.
Spare parts
Spare part*
Position designation** Quantity
Zone diaphragm
(6)
1
Valve plates/seals
(9)
2
O-ring (.29 versions)
(10)
1
Tab. 33 *According to spare parts list, Chapter
**According to
Fig. 10
Tool and material
Quantity
Tool/material
1
Allen key, 3 mm
1
Allen key, 4 mm
1
Felt-tip pen
Tab. 35
Information on the procedure Always replace zone diaphragm, valve plates/seals and O-ring (only .29
version) together to maintain the performance of the pump.
