Replacing The Diaphragm And Plug - Samson 3349 Mounting And Operating Instructions

Servicing
7. Push the plug (2) together with plug stem
(3) and diaphragm (24) into the valve
bonnet (20.1).
8. Carefully slide the packing parts (15, 19,
23) over the plug stem into the packing
chamber using a suitable tool.
9. Tighten the threaded bushing (5.2).
10. Place the valve bonnet (20.1) together
with the plug stem (3), plug (2) and dia-
phragm (24) onto the body (1).
11. Apply a suitable lubricant to the bolts
(34).
12. Gradually tighten the screws (34) on the
valve bonnet (20.1, 20.2) in a crisscross
pattern. Observe tightening torques.
13. Mount actuator. See associated actuator
documentation and the 'Installation' sec-
tion.
14. Adjust lower or upper signal bench
range. See associated actuator docu-
mentation.
9.5.2 Replacing the dia-
phragm and plug
1. Remove the actuator from the valve. See
associated actuator documentation.
2. Undo the screws (34).
3. Lift the standard yoke (20) together with
the plug stem (3), plug (2) and dia-
phragm (24) off the body (1).
4. Pull the plug (2) together with plug stem
(3) and diaphragm (24) out of the stan-
dard yoke (20).
9-6
For version with packing (micro-flow
valve version): replace the packing (see
section 9.5.1).
5. For micro-flow valve version: unscrew
threaded pin (6.1) (see Fig. 9-4).
6. Unscrew the plug stem (3) from the plug
(2).
7. Remove diaphragm (24).
8. For standard version: remove retaining
washers (6.2) (see Fig. 9-3).
9. Remove any excess lubricant or contami-
nation that may still exists from previous
use.
10. Apply a suitable lubricant to the thread
of the plug stem (3).
11. Screw a new plug (2) onto the plug stem
(3) using a suitable tool. Observe tight-
ening torques.
12. Mark the side mounting position.
13. Unscrew the plug stem (3) from the plug
(2).
14. For standard version: insert new retain-
ing washers (6.2) inside the plug's
threaded hole (they must be opposed to
form an X shape) (see Fig. 9-3).
15. Insert a new diaphragm (24) into the
new plug.
16. Screw the new plug (2) back onto the
plug stem (3) again using a suitable tool.
Align the plug stem with the mounted po-
sition mark made earlier. To do this,
clamp the plug into a suitable clamping
fixture (e.g. vise with soft protective jaws)
and pull it with a suitable tool.
17. Remove the mounting position mark.
EB 8048-2 EN