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

15. Apply a suitable lubricant to the bolts
(34).
16. Gradually tighten the screws (34) on the
valve bonnet (20.3) in a crisscross pat-
tern. Observe tightening torques.
17. For version with Type 3724 Positioner:
initialize the positioner (u EB 8395).
9.6.2 Replacing the dia-
phragm and plug
Note
Before replacing the diaphragm and plug,
remove the valve from the plant.
1. Undo the screws (34) on the valve bon-
net (21).
2. Lift the actuator and valve bonnet (21)
together with the plug stem (3), plug
(2),and diaphragm (24) off the body (1).
3. Unscrew the plug stem (3) together with
plug (2) and diaphragm (24) off the ac-
tuator stem and pull it out of the valve
bonnet (21).
4. Unscrew the actuator onto the valve bon-
net (21).
For version with packing (micro-flow
valve version): replace the packing (see
section 9.6.1).
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).
EB 8048-2 EN
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.
18. For micro-flow valve version: secure
plug (2) with threaded pin (6.1) (see
Fig. 9-4).
19. Check the concentricity of the plug (see
section 9.7).
20. Clean the flange area that will be locat-
ed above the diaphragm with detergent
Servicing
9-11