Diaphragm
–Liquid pump NF 10
Servicing
KNF Flodos AG BA_NF10_EN_05_069219
Operating and Installation Manual
19
Disassembling the pump head
1. Undo the 4 head screws (
1
) using a Torx T6 screwdriver and
remove the head plate (
2
).
2. Remove the resonating diaphragm (
3
) from the connection
plate (
4
).
Removing valves and seals
3. Remove the connection plate (
4
) from the intermediate plate
(
6
).
4. Take out the valves (
5
) from the intermediate plate (
6
).
5. Grip the diaphragm (
7
) and turn it anti-clockwise. Ensure that
none of the spacers (
8
)
don’t fall into the housing.
It is recommended to replace the diaphragm (
7
).
Clean the parts
6. Using a cloth clean the Head plate (
2
), connecting plate (
4
),
intermediate plate (
6
), valve plate (
5
) and diaphragm (
7
) and
blow compressed air over them.
Replace the diaphragm
7. Place all of the spacers (
8
) back onto the diaphragm thread.
8. Screw the diaphragm (
7
) securely back into the con-rod. Make
sure that no spacers (
8
) fall into the housing.
9. By lightly pressing on the diaphragm push the ridge on the
underside of the diaphragm into the groove of the housing..
Install the valves
10.
Place the „dust free“ valve plate(
5
) into the intermediate plate
(
6
).
Assemble the pump head
11. Place the resonating diaphragm (
3
) in the top of the connection
plate (
4
) and cover with the head plate (
2
).
12. The visible lines down the side of the pump must be inline on
the intermediate and connection plate.
13. The head plate (
2
) must be positioned so that the arrows
coincide with the hydraulic connections on the connection plate
(
4
).
14. Push the four head screws (
1
) into the head holes.
15. Place the pump head onto the pump housing and tighten the
head screw diagonally.
16. Connect the pump up with the inlet and outlet tubes.
8.3. Replace the diaphragm and valves
The same procedure is to followed as in section 8.2 cleaning. But
instead of just cleaning the diaphragm (
7
), resonating diaphragm
(
3
) and valves (
5
) these must be replaced with new parts.
Fig. 9
1
Head screws
2
Head plate
3
Resonating diaphragm
4
Connection plate
5
Valve plate
6
Intermediate plate
7
Diaphragm
8
Spacer
