Samson 3251, Mounting And Operating Instructions

Page: 48 / 60

48 EB 8052 EN
Servicing
7.3.2 Version with insulating
section
1. Remove the actuator from the valve. See
associated actuator documentation.
2. Unscrew the castellated nut (92) and lift
the yoke (3) off the insulating section
(21).
3. Undo the body nuts (14) gradually in a
crisscross pattern.
4. Lift the insulating section (21) together
with the plug stem and plug (5) off the
body (1).
5. Replace the gasket as described in sec-
tion 7.1.2.
6. Unthread the stem connector nut (9) and
lock nut (10) from the plug stem (5).
7. Unscrew the threaded bushing (8).
8. Pull the plug with plug stem (5) out of the
insulating section (21).
9. Pull all the packing parts out of the pack-
ing chamber using a suitable tool.
10. Make sure that the guide bushing (7) is
not damaged. If necessary, replace the
guide bushing using a suitable tool.
11. Unscrew the seat (4) using a suitable
tool.
12. Apply a suitable lubricant to the thread
and the sealing cone of the new seat.
13. Screw in the seat (4). Observe tightening
torques.
14. Apply a suitable lubricant to all the pack-
ing parts and to the new plug stem (5).
We recommend replacing the packing as
well. See section 7.2.2.
15. Slide the new plug with plug stem (5) in-
to the insulating section (21).
16. Place the insulating section (21) together
with the plug stem and plug (5) onto the
body (1).
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.
17. Carefully slide the packing parts over the
plug stem extension into the packing
chamber using a suitable tool. Observe
the proper sequence (see Fig. 6).
18. 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.
19. Screw in the threaded bushing (8) and
tighten it. Observe tightening torques.
20. Place yoke (3) on the insulating section
(21) and fasten tight using the castellated
nut (92).
21. Loosely screw the lock nut (10) and stem
connector nut (9) onto the plug stem.
22. Mount actuator. See associated actuator
documentation.
23. Adjust lower or upper signal bench
range. See associated actuator docu-
mentation.