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6.7 Replacing the flow control valve assembly
Part number:
— AW502 068 (imperial, for
— AW502 069 (metric, for 6 mm pipe)
IMPORTANT (NOTE)
– Ensure the correct kit has been ordered
(6 mm pipe or ¼ in. pipe).
– Before proceeding, shut off flow to the
flowcell assembly.
Referring to Fig. 6.8:
1. Depress manual override button
drain the wet-section.
2. Unscrew coupling nut C at the flow control valve inlet and
remove sample feed pipe D.
3. Unscrew coupling nut E and remove old flow control
valve F.
4. Offer up replacement flow control valve F to inlet stub
G on flowcell assembly H and with the flow control
valve in the vertical position, lightly nip up coupling nut E
– do not tighten at this stage.
5. Push sample feed pipe D into the base of replacement
flow control valve F and lightly nip up coupling nut C –
do not tighten at this stage.
6. Check that sample feed pipe D and flow control valve F
are in the correct orientation.
7. Tighten coupling nut E (on the valve outlet side) and
coupling nut C (on the sample inlet pipe) finger-tight, then
1
turn another 1 to 1
/
4
8. Turn the flow control valve F to the shut position;
reintroduce the sample upstream at a low flow rate initially
and check for leakage. If any leaks are detected, slowly
tighten coupling nuts E and C until no further leakage
is detected.
9. Open the feed line upstream to the required volume flow
rate and check for leaks. If no leaks are detected, open
flow control valve F until the required flow rate is present.
8
INS/ANAINST/025-EN Rev. B | Navigator ADS551 | Low level dissolved oxygen | Replacement / Upgrade procedures – wet section spares
1
/
in. pipe)
4
A
on drain valve
turns using a spanner.
B
to
Fig. 6.8 Replacing the flow control valve assembly
1
1 to 1
/
turns
4
1
1 to 1
/
turns
4
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