KNF N86.18 Manual De Instrucciones página 81

Diaphragm pump N86.18 / N811.18
Translation of Original Operating and Installation Instruction, KNF 121435-121438
02/23
7. Screw the new diaphragm (9) with diaphragm support and
shim(s) (11) clockwise onto the connecting rod and hand-
tighten.
When screwing in the diaphragm (9), ensure that it is not
overtightened.
If the diaphragm is overtightened, there is a risk that it
could be damaged.
c.) Replacing the valve plates/seals
1. Remove the valve plates/seals (7) from the intermediate
plate (2).
2. Check the valve seats, intermediate plate (2) and head
plate (3) for cleanliness; if they are uneven, scratched or
corroded, replace these parts (contact KNF Customer Ser-
vice for this).
3. Insert the new valve plates/seals (7) in the valve seats of
the intermediate plate (2).
The valve plates/seals (7) for the pressure and suction
sides are identical; the same applies to the top and bot-
tom of the valve plates/seals (7).
4. By slightly moving the valve plates/seals (7) horizontally,
make certain that they are not under tension.
5. Make certain that the valve plates/seals (7) are centered
in the valve seats of the intermediate plate (2).
6. Properly dispose of the replaced diaphragm, valve plates/
seals.
Fitting the pump head
1. Place the intermediate plate (2) with the valve plates/seals
(7) on the housing according to the pencil marking.
2. Place the head plate (3) together with the cover (5) on the
housing (1) in accordance with the marking.
3. With a slight lateral movement of the head plate (3), check
its centering.
4. Tighten the screws (4) crosswise (tightening torque: 70
Ncm).
Servicing
DE
EN
FR
ES
IT
33