Samson 3525, Монтаж и эксплуатация

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42 EB 8823 EN
Maintenance
9. Slide guide bushing (7) and packing
parts over the plug stem. Make sure you
observe the proper order (see Fig. 12).
10. Carefully insert plug with plug stem,
packing parts and guide bushing into the
bonnet.
Risk of leakage due to damaged packing
chamber, packing parts and plug stem.
When inserting the assembly into the bonnet
make sure that the packing chamber, pack-
ing parts and plug stem do not get dam-
aged. Otherwise leakage may occur.
11. Thread guide bushing (7) into the bonnet
(2) and tighten it placing a suitable tool
on the flats. Observe tightening torques.
12. Check O-rings for damage. Replace
O-rings, if necessary (see section 7.2.1).
13. Apply a suitable lubricant to the bonnet
(2).
14. Screw bonnet (2) with yoke (3) and plug
with plug stem (5) into the body (1). Ob-
serve tightening torques.
15. Mount stem connector clamp (A28) and
adjust travel. See associated actuator
documentation.
7.2.3 Replacing the seat and
plug
Risk of damage to the facing of the seat and
plug due to abrasion and incorrect service
or repair.
The plug and seat facings are very sensitive.
− Before unscrewing the bonnet from the
body, apply a signal pressure to the actua-
tor to slightly lift the plug off the seat. This
prevents the plug and seat from being
damaged.
−
Always replace both the seat and plug.
When replacing the seat and plug, we also
recommend replacing the packing. See sec-
tion 7.2.2.
Standard plug material (Stellite
®
6)
It is not necessary to remove the actuator
from the valve to replace the seat and the
plug.
1. Apply a signal pressure to the actuator to
slightly lift the plug off the seat. Unscrew
the bonnet (2).
2. Lift bonnet (2), yoke (3) and plug with
plug stem (5) off the body (1).
3. Replace O-rings (17) as described in
section 7.2.1.
NOTICE
!
NOTICE !
Tip
Note