KNF LABOPORT N86.18 Originalbetriebsanleitung Seite 84

Servicing
36
When screwing in the diaphragm (8), 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
intermediate plate (2) in accordance with the marking.
3. With a slight lateral movement of the head plate (3), check
its centering.
4. Tighten the screws (4) finger-tight in a crosswise pattern.
Translation of Original Operating and Installation Instruction, KNF
Diaphragm pump N86.18 / N811.18
121435-121438 02/23