Servicing
LABOPORT Pumps and Systems
40
Translation of original Operating Instructions, english, KNF 121211-121345 01/10
Change valve plates/sealings
Replacing the valve plates/sealings of two-headed pumps
consecutively.
In version N 842.3 FT.18, three (instead of one) screws must
be loosened in the first work step.
1. Loosen screw(s) (
1
) in the center of the top plate (
2
). With a
two-headed pump: loosen the screw(s) from just one pump
head.
2. Remove top plate (
2
) and head plate (
3
) from intermediate
plate (
5
).
Valve plates/sealings are visible.
3. Remove old valve plate/sealings.
4. Clean intermediate plate (
5
) carefully (if there should be depos-
its in the recesses in the intermediate plate).
5. Insert new valve plates/sealings (
4
) in the recesses in the
intermediate plate (
5
).
6. For two-headed pumps: Carry out the steps 1 to 5 for the
second pump head.
7. Dispose of the old diaphragm(s) and valve plates/sealings
properly.
Refitting pump head
1. Apply pressure all around the edge of the diaphragm. With a
two-headed pump: Apply pressure to diaphragm on only one
pump.
2. Place the intermediate plate (
8
) with valve plates/sealings on
the adapter in accordance with the felt-tip pen marking.
3. Place the head plate (
6
) on the intermediate plate (
8
) in the
position indicated by the guide pin (
7
).
4. Place the top plate (
5
) on the head plate (
6
) in accordance with
the felt-tip pen marking.
5. Gently tighten screws (
4
) in diagonal order.
In version N 842.3 FT.18, three (instead of one) screws must
be tightened in the next work step.
6. Insert screw(s) (
1
) with disk springs (
2
,
3
) in the center of the
top plate (
5
). In doing so, make sure that the disk springs are
arranged properly (see fig. 24).
7. Screw in the screw/screws (
1
) in the centre of the pump top
plate (
5
) until it is flush with the top plate (they are flush with
the top plate); then screw one final half turn to tighten.
8. For two-headed pumps: Carry out steps 1 to 7 for the second
pump head.
9. For two-headed pumps: Refit the pneumatic head connection:
Place tube onto the connecting part of the angle fitting, turn
angle fitting to a straight position and tighten the union nut.
Fig. 23: Changing valve
plates/sealings
1
2
3
4
5
6
7
8
Fig. 24: Refitting pump head
Содержание Laboport N810
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