Diaphragm liquid pump NF 25, NFB 25
Servicing
KNF Flodos AG BA_NF25_NFB25_EN_07_159615
Translated from the Original Operating and Installation Instructions
20
8.2.3. Disassembling the pump head
Loosen the four head screws (
1
) and remove the entire
head.
Remove the resonating diaphragm (
3
) from the connecting
plate (
4
).
Remove both anchor valves (
6
) from the intermediate plate
(
7
) and the connecting plate (
4
).
Remove the two anchor valve seals (
5
) from the connecting
plate (
4
).
Undo the diaphragm (
8
) by means of the head plate (
2
). Re-
move the washers and make sure that no washers (
9
) fall in-
to the pump housing.
We recommend replacing the diaphragm (
8
).
8.2.4. Clean or replace parts
Clean the anchor valves (
6
), the anchor valve seals (
5
) and
the diaphragm (
8
) with a cloth and then blow off with com-
pressed air or replace.
Blow off the intermediate plate (
7
), connecting plate (
4
) and
head plate (
2
) with compressed air.
8.2.5. Assembling the pump head
Screw diaphragm (
8
) with washer (
9
) into connecting rod.
Make sure that no washers (
9
) fall into the pump housing.
Use the head plate (
2
) to carefully tighten the diaphragm.
Insert the seals (
5
) in the connecting plate (
4
).
Insert the anchor valves (
6
) in the intermediate plate (
7
) and
the connecting plate (
4
).
Place the connecting plate (
4
) on top of the intermediate
plate (
7
).
A pin and hole system prevents incorrect assembly.
Insert the resonating diaphragm (
3
) into the connecting plate
(
4
).
Place the head plate (
2
) on top of the connecting plate (
4
). A
pin and hole system prevents incorrect assembly.
Insert the four head screws (
1
) into the through holes of the
pump head.
Place the pump head on top of the pump housing and make
sure that the flow direction of the pump head (see directional
arrow on the head plate (
2
)) is the same as before.
Alternately tighten the four head screws (
1
).
Reconnect the hoses to the pump head.
Fig. 18
1
Head screws
2
Head plate
3
Resonating diaphragm
4
Connecting plate
5
Anchor valve seals
6
Anchor valves
7
Intermediate plate
8
Diaphragm
9
Washer
