KNF N96K E-W, Manual

Page: 28 / 36

Servicing Diaphragm pump N96_AC
28 Translation of Original Operating and Installation Instruction, english, KNF 329772-329775 06/22
3. Screw the new diaphragm (5) onto the connecting rod (6) (clockwise)
and hand tighten the diaphragm (5).
When screwing in the diaphragm (5), ensure that it is not overtight-
ened.
If the diaphragm is overtightened, there is a risk that it could be
damaged.
d.) Replace valve plates
1. Separate the head plate (2) from the intermediate plate (4).
2. Remove the valve plates/seals (3) from the head plate (2).
3. Check valve seats, intermediate plate and head plate for cleanliness;
replace these parts in the event of unevenness, scratches or corrosion
(contact your KNF Customer Service in this case).
Insert new valve plates/seals in the valve seats of the intermediate
plate; the valve plates/seals are identical for the pressure and suc-
tion side; the same applies for the top and bottom of the valve
plates/seals.
4. By slightly moving the valve plates/seals horizontally, ensure that they
are not under tension.
5. Make certain that the valve plates/seals are centered in the valve seats
of the intermediate plate.
e.) Mount pump head
1. Place the intermediate plate (4) with valve plates/seals (3) on the hous-
ing.
2. Place head plate (2) on intermediate plate (4) according to the center-
ing.
Place pump head on the compressor housing according to the
alignment of the gas connections.
3. Tighten the screws (1) crosswise (tightening torque: ~190 Ncm / 16.8
in-lb).
f.) Final steps
WARNING
Risk of injury and poisoning from leaks
à
Before recommissioning the pump, check the
pump heads and pneumatic connections for
leaks. Leaks may lead to poisoning, chemical
burns or similar injuries.
à
Connect the pump to the power supply.
If you have questions with regard to maintenance, please contact your
KNF Customer Service (contact data: see www.knf.com).