Samson 3525, Монтаж и эксплуатация

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38 EB 8823 EN
Maintenance
7.1.3 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.
It is not necessary to remove the actuator
from the valve to replace the seat and the
plug.
When replacing the seat and plug, we also
recommend replacing the packing. See sec-
tion 7.1.2.
1. Bend down the flap of the tab washer
(224).
2. Apply a signal pressure to the actuator to
slightly lift the plug off the seat. Unscrew
the bonnet (2).
3. Lift bonnet (2) and plug with plug stem
(5) off the body (1). Remove tab washer
(224).
4. Replace O-rings (17) as described in
section 7.1.1.
5. Unscrew the seat (4) using a suitable
tool.
6. Remove seat ring gasket (127) from the
body (1) and carefully clean the sealing
face. Insert a new seat ring gasket into
the body.
7. Apply a suitable lubricant to the thread
and the sealing cone of the new seat.
8. Screw in the new seat (4) using a suit-
able tool. Observe tightening torques.
9. Carefully warm up the plug (29) so that
it can be removed from the plug stem
(36) in the next step.
10. Apply a signal pressure to the actuator
so that the flats at the plug stem (36)
emerge from the bonnet. Place wrench
on flats.
11. Place another wrench on the flats of the
plug (29).
12. Loosen plug with wrench while counter-
ing with the top wrench.
13. Apply suitable threadlocker to the thread
of the new plug (29).
14. Screw plug head (29) onto the plug stem
(36) using a suitable tool. Observe tight-
ening torques.
15. Replace packing (15) as described in
section 7.1.2.
16. Apply a suitable lubricant to the bonnet
(2).
17. Place a new tab washer (224) onto the
bonnet (2).
NOTICE !
Note
Tip