IM-S24-42
CTLS Issue 10
47
4.7 Bellows sealed valves
Note:
These valves are fitted with a bellows stem seal as the primary seal together with a graphite stem
seal. Any leakage from the stem will indicate a failure of the bellows seal.
4.7.1 Procedure for renewing the bellows (B) and (C) assembly:
-
Isolate the valve on both sides.
Caution:
care should be taken in removing the valve
bonnet since fluid under pressure may be trapped between
the two isolating valves.
-
Remove the actuator from the valve. Refer to the
Installation and Maintenance Instructions covering
Spirax Sarco actuators.
-
Remove the lock-nut (
3
).
-
Loosen the gland nut (
18
).
-
Remove the 4 bonnet nuts (
27
).
-
Gently remove the bonnet leaving the plug stem exposed.
-
Remove the body nuts (
7
) and remove the bellows bonnet
from the valve body.
-
Grip the stem from the top. Push the stem (
8
) down to
expose a lock-nut (
26
). Release the lock-nut and unscrew
the plug from the stem.
-
Remove and replace the bellows (
21
) from the bellows
housing (
29
).
-
Grip and push the new stem (
8
) to expose the thread -
using Loctite retainer 620, screw in the plug.
-
Tighten lock-nut (
26
) to 20 N m.
-
Replace seat gasket (see Section 4.2.1) and bonnet
gasket (
4
) then re-assemble the bellows housing to the
valve body. Finger tighten in sequence, refer to the note
under bonnet nut torque setting, (see Table 1, page 37).
-
Fit new stem seals in accordance with Section 4.2.
-
Slide the bonnet (
2
) over the stem (
8
) and replace the
body nuts (
27
) and tighten, in sequence, referring to
Table 1 (page 37).
-
Bring the valve back into service.
-
Check for leakage at the gland.
3
21
29
8
27
27
18
26
Fig. 13
Summary of Contents for Spira-trol K Series
Page 2: ...IM S24 42 CTLS Issue 10 2...
Page 53: ...IM S24 42 CTLS Issue 10 53 Fig 22 Balanced 3 19 4 6 16 31 Fig 21 15...
Page 57: ...IM S24 42 CTLS Issue 10 57 C1 C D1 D2 D B E G A H Soft seat arrangement C2 Fig 26 H1...
Page 61: ...IM S24 42 CTLS Issue 10 61 C2 B D4 D5 E G D F A H Soft seat arrangement Fig 28 H1...
Page 66: ...IM S24 42 CTLS Issue 10 66...
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Page 68: ...IM S24 42 CTLS Issue 10 68...
