Samson 3251, Mounting And Operating Instructions

Page: 47 / 60

EB 8052 EN 47
Servicing
When replacing the seat and plug, we also
recommend replacing the packing. See sec-
tion 7.2.
7.3.1 Standard version
1. Remove the actuator from the valve. See
associated actuator documentation.
2. Unscrew the castellated nut (92) and lift
the yoke (3) off the flange (2).
3. Undo the body nuts (14) gradually in a
crisscross pattern.
4. Lift the flange (2) and plug with plug
stem (5) off the body (1).
5. Replace the gasket as described in sec-
tion 7.1.1.
6. Unthread the stem connector nut (9) and
lock nut (10) from the plug stem.
7. Unscrew the threaded bushing (8).
8. Pull the plug with plug stem (5) out of the
flange (2).
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 7.2.1.
15. Slide the new plug with plug stem (5) in-
to the flange (2).
16. Place the flange (2) together with the
plug stem and plug (5) onto the body
(1).
Version with V-port plug: place the
flange (2) 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 into the packing chamber us-
ing a suitable tool. Observe the proper
sequence (see Fig. 6).
18. Firmly press the plug (5) into the seat (4).
Fasten down the flange (2) with the body
nuts (14). Tighten the nuts gradually in a
crisscross pattern. Observe tightening
torques.
19. Screw in the threaded bushing (8) and
tighten it. Observe tightening torques.
20. Place yoke (3) on the flange (2) and fas-
ten 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.
Tip