KNF N838 E Series - Page 44

Servicing
Diaphragm pump N838_E
44
Translation of Original Operating and Installation Instruction, KNF
347394-347605 09/23
3. Check the valve seats, intermediate plate and head plate
for cleanliness; Replace these parts if there are bumps
and scratches on them.
NOTICE
The valve plates/seals are identical for
the pressure and suction side. The
same applies for the top and bottom of
the valve plates/seals.
4. Insert the new valve plates/seals (6) in the valve seats of
the intermediate plate (2).
5. By slightly moving the valve plates/seals horizontally, en-
sure that they are not under tension.
Fitting the pump head
1. Move the diaphragm over the fan wheel to top dead cen-
ter.
2. Place the pump head(s) (consisting of intermediate plate
(2) with valve plates/sealing rings (6) as well as head plate
(3) on the housing according to the markings (M).
3. Only slightly tighten the screws (4) crosswise.
4. Check for ease of movement of the pump by turning the
fan wheel.
5. Move the diaphragm over the fan wheel to top dead cen-
ter.
6. Hand-tighten the screws (4) crosswise (tightening torque:
3.5 Nm).
Final steps
1. Connect the pump to the power supply.
If you have questions with regard to maintenance, please con-
tact our KNF technical adviser (contact data: www.knf.com).