Maintenance - Replacing Parts; Cleaning And Replacing The Plug - Samson 45-6 Mounting And Operating Instructions

4 Maintenance – Replacing
parts
The regulator is maintenance-free, but is
subject to wear and tear, especially at the
seat, plug and operating diaphragm.
Depending on the application conditions
that prevail, the regulator must be inspected
at appropriately scheduled intervals to pre-
vent any problems before they occur.
Details on faults and the recommended
action can be found in the table on page 8.
If a problem cannot be solved with the help
of the information specified in the table,
contact SAMSON. In order to replace the
plug and operating diaphragm, proceed as
described in sections 4.1 and 4.2.
Caution!
To carry out any work on the differ-
ential pressure regulator, you have
to remove the device from the pipe-
line. For this purpose, first allow the
relevant section of the plant to cool
down in the case of high tempera-
tures. Then, depressurize and drain
this section prior to removing the regu-
lator.
4.1 Cleaning and replacing the
plug
– Refer to Fig. 1 on page 4 –
Maintenance – Replacing parts
Caution!
The positioning springs are pre-loaded.
Take appropriate precautionary measures: if
necessary, make a disassembly tool or use
SAMSON's disassembly tool 9129-2747.
1. Remove regulator from the pipeline.
Unscrew control line (11).
2. Disassemble positioning springs (8).
3. Unscrew stopper (1.2).
4. Loosen body screws (7) and remove ac-
tuator.
5. Unscrew plug nut (3.1) and remove
valve plug (3) from plug stem.
6. For valve sizes DN 15 to 25, unscrew
and remove the guide nipple of the plug
(3.2) using a socket wrench (order no.
1280-3001).
For valve sizes DN 32 to 50, first re-
move screw ferrule (3.3) and then pull
out guide nipple (3.2).
7. Clean seat and plug assembly thor-
oughly. Check control line, screw con-
nections, and hole (11.1) for any block-
ages.
Should the plug be damaged, replace
the entire plug assembly.
Replace the seat if it is damaged.
To reassemble the regulator, proceed in re-
verse order.
Make sure that the diaphragm is inserted
properly in the body groove before fasten-
ing the components.
Refer to tightening torques listed in the table
in Fig. 1.
7
EB 3226 EN