Diaphragm liquid pump NF 30, NFB 30
Servicing
KNF Flodos AG BA_NF30_EN_05_069206.docx
Translated from the Original Operating and Installation Instructions
22
Dismantling the pump heads
1. Loosen the four head screws (
1
) and remove the entire head.
Removing the valves and seals
2. Remove the connecting plate (
3
) from the intermediate plate
(
5
).
3. Take the valve plate (
4
) out of the intermediate plate (
5
).
4. For NF 30.27 pumps only:
remove the diaphragm.27 (
15
), sliding disk.27 (
14
), support.27
(
13
), washer.27 (
12
) and compression spring.27 (
11
) from the
connecting plate (
3
).
5. Carefully grip the diaphragm (
6
) and remove by turning anti-
clockwise. Remove the washers (
7
) and make sure that no
washers fall into the pump housing.
We recommend replacing the diaphragm (
7
).
Clean the parts
6. Clean the diaphragm (
6
), diaphragm.27 (
15
), sliding disk.27
(
14
), support.27 (
13
), washer.27 (
12
), compression spring.27
(
11
), valve plate (
4
), intermediate plate (
5
) and connecting
plate (
3
) using a cloth and then blow off with compressed air.
Mounting the diaphragm
7. Place the same number of washers (
7
) on the new diaphragm
(
6
) as were on the old diaphragm thread. Make sure that no
washers fall into the pump housing. Screw the diaphragm (
6
)
securely back into the connecting rod.
9. By lightly pressing on the diaphragm push the ridge on the
underside of the diaphragm into the groove of the housing.
Mounting the valve plates
10.
Insert the “dust free” valve plates (
4
) in the intermediate plate
(
5
) making sure they are in the correct position.
Mounting the pump head
➔
The method of assembly will depend on the pump type. For
this reason, please proceed with the section that corresponds
to the pump type you are using
(NF 30 and NF 30 KP.51
version
or NF 30.27 version
).
➔
Re-connect the hoses to the pump head.
Fig. 19: NF30
Fig. 20: NF30.27
1
Head screw
2
Head plate
3
Connecting plate
4
Valve plate
5
Intermediate plate
6
Diaphragm
7
Washer
8
Setscrew.27
9
Hexagon nut.27
10
Head plate.27
11
Compression spring.27
12
Washer.27
13
Support.27
14
Sliding disk.27
15
Diaphragm.27
