Samson 3251, Mounting And Operating Instructions, Page: 45 / 60

EB 8052 EN 45
Servicing
Version with V-port plug: place the insu-
lating section (21) onto the valve body,
making sure that the largest V-shaped
port of the V-port plug faces toward the
valve outlet. See section 5.1.
13. Carefully slide the packing parts over the
plug stem into the packing chamber us-
ing a suitable tool. Observe the proper
sequence (see Fig. 6).
14. Firmly press the plug (5) into the seat (4).
Fasten down the insulating section (21)
with the body nuts (14). Tighten the nuts
gradually in a crisscross pattern. Ob-
serve tightening torques.
15. Screw in the threaded bushing (8) and
tighten it. Observe tightening torques.
16. Place yoke (3) on the insulating section
(21) and fasten tight using the castellated
nut (92).
17. Loosely screw the lock nut (10) and stem
connector nut (9) onto the plug stem.
18. Mount actuator. See associated actuator
documentation.
19. Adjust lower or upper signal bench
range. See associated actuator docu-
mentation.
ADSEAL packing
1. Proceed as described in Standard pack-
ing (PTFE), steps 1 to 12.
2. Carefully slide the packing parts over the
plug stem into the packing chamber us-
ing a suitable tool. Observe the proper
sequence (see Fig. 7).
3. Slide the seals (15.2) over the plug stem.
Insert the wire of the red spacer ring
(15.1) into the groove of the retaining
ring.
Slide the retaining ring over the plug
stem.
4. Insert the red spacer ring (15.1) between
the threaded bushing (8) and retaining
ring. See Fig. 7.
5. Proceed as described in Standard pack-
ing (PTFE), steps 14 to 19.
7.3 Replacing the seat and
plug
Risk of control valve damage due to incorrect
service or repair.
Seat and plug can only be replaced when all
the following conditions are met:
− The valve size is ≤NPS 4.
− The valve does not have a balanced plug.
− The valve does not have a bellows seal.
− The valve does not have a flow divider.
− The valve does not have a AC trim.
− The standard or ADSEAL packing is in -
stalled in the valve.
To replace seat and plug in other valve ver-
sions, contact SAMSON's After‑sales Service
department.
Risk of damage to the facing of the seat and
plug due to incorrect service or repair.
Always replace both the seat and plug.
NOTICE
!
NOTICE
!