KNF N87.9, Инструкции по эксплуатации и монтажу, Страница: 23 / 32

Diaphragm pump N87.9 Servicing
Translation of Original Operating and Installation Instruction, english, KNF 121538-121541 11/22 23
Information on the procedure
à
Always replace diaphragm and valve plate/seals together to maintain
the performance of the pump.
WARNING
Health hazard due to dangerous substances in the
pump
Depending on the medium being transferred,
caustic burns or poisoning is possible.
à
Wear protective equipment if necessary, e.g.,
protective gloves, goggles.
à
Clean the pump with suitable measures.
Removing the pump head
2
1
3
1. Mark the pressure plate, head plate, intermediate plate and housing
with a felt-tip pen ( Fig. /1) to ensure proper mounting.
2. Remove the housing cover ( Fig. /3).
3. Loosen the four fastening screws (Fig. 4/2) and remove the housing
cover (Fig. 4/3).
The counterweight is visible.
Fig.4 Replacing the structured di-
aphragm
4. Loosen the four screws ( Fig. 4/1) and remove the pressure plate ( Fig.
4/4).
5. Remove the screw covers ( Fig. 4/2); loosen the two screws ( Fig. 4/3)
and remove the head plate ( Fig. 4/5) and the intermediate plate ( Fig.
4/6).
The structured diaphragm (7) is visible.
Replacing the structured diaphragm
1. Turn the pump to the side; this prevents the shim rings (10) from falling
into the pump chamber when the structured diaphragm (7) is removed.
2. Move the structured diaphragm (7) by turning the counterweight to the
upper reversal point.
3. Lift the structured diaphragm (7) onto opposing side edges; hold the
structured diaphragm and unscrew it counterclockwise.
4. Remove the diaphragm support (9) and the shim ring(s) (10) from the
threaded bolt (8) of the structured diaphragm and keep in a safe place.
5. Check all parts for contamination and clean them if necessary.
6. Push the diaphragm support (9) and the shim ring(s) (10) onto the
threaded bolt (8) of the new structured diaphragm (7) in this order.
7. Move the connecting rod (connection part between drive shaft and
structured diaphragm) to top dead center by turning the counterweight.
8. Screw the structured diaphragm with diaphragm support and shim
ring(s) clockwise onto the connecting rod and hand tighten them.
Replacing the valve plates/seals
1. Remove the valve plates/seals (12) from the intermediate plate (6).
2. Check the valve seats, intermediate plate (6) and head plate (5) for
soiling and damage. Clean the parts if necessary.
3. Contact KNF in the event of unevenness, scratches or corrosion. Order
and replace damaged parts.