IM-S24-42
CTLS Issue 10
42
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TRANSLATION RUN OVER
4.2 Removal of valve bonnet
Note:
This procedure is necessary before carrying out any of the maintenance procedures detailed below:
-
Ensure that the valve is depressurised and clear of media and isolate it both upstream and downstream.
-
Caution:
care should be taken when disassembling the valve in case of residual pressure being trapped
between the isolation points.
-
Remove the actuator from the valve. Refer to the Installation and Maintenance Instructions covering
Spirax Sarco actuators.
-
Unscrew the gland nut (
18
).
-
Undo and remove the bonnet nuts (
27
) or the bolt if it is the LE valve.
-
Remove the bonnet (
2
) and plug and stem assembly (
8
).
-
Remove and discard the body gasket.
4.3 Replacement of PTFE gland packings
(reference Figure 8)
-
Remove the lock-nut (
3
), gland nut (
18
), 'O' rings (
15
and
17
) and scraper ring (
19
) from the gland nut,
ensuring that the grooves are clean and undamaged, replace with new items. The use of silicone grease
on the 'O' rings is recommended.
-
Withdraw the gland components and discard (
9, 10, 12
and
14
).
-
Clean the gland cavity and fit new gland components in the order shown in Figure 8.
Note
that the lower bearing must be fitted with the radiused edge downwards. When fitting the chevron
seals they should be inserted with correct orientation (see Figure 8), one at a time to ease the assembly
process.
-
Apply a light smear of anti-seize lubricant to the gland nut threads before screwing it in two or three
turns. At this stage the packing must not be significantly compressed.
-
Final adjustment of the gland must be carried out after refitting the bonnet as detailed in Section 4.6.
4.4 Replacement of graphite gland packing
(reference Figure 9)
-
Remove the lock-nut (
3
), gland nut (
18
) and scraper ring (
19
) from the gland nut, ensuring that the groove
is clean and undamaged, replace with new item.
-
Remove the upper Stellite bearing (
9
) and retain, withdraw the graphite packing (
14
) and discard. Remove
the spacer and lower bearing (
16
). Clean and examine these components and the upper bearing replacing
any that show signs of damage or deterioration.
-
Clean the gland cavity and reassemble the gland components in the order shown in Figure 10.
Note
that the lower bearing must be fitted with the radiused edge downwards. When fitting the graphite
seals, the scarf joints in each seal must be offset from the one below by 90
°
.
-
Apply a light smear of anti-seize lubricant to the gland nut threads before screwing it in sufficiently to
seat and hold the packing without compressing them.
-
Final adjustment of the gland must be carried out after refitting the bonnet as detailed in Section 4.6.
Содержание Spira-trol K Series
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Страница 53: ...IM S24 42 CTLS Issue 10 53 Fig 22 Balanced 3 19 4 6 16 31 Fig 21 15...
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Страница 61: ...IM S24 42 CTLS Issue 10 61 C2 B D4 D5 E G D F A H Soft seat arrangement Fig 28 H1...
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