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4
Maintenance – Replacing
parts
The differential pressure regulator is mainte-
nance free. Nevertheless, it is subject to nat-
ural wear, particularly at the seat, plug and
operating diaphragm. Depending on the
operating conditions that prevail, inspect the
regulator at regular intervals to avoid possi-
ble malfunctions.
Details on faults and the recommended ac-
tion can be found in section 5. If a problem
cannot be solved with the help of the infor-
mation specified in the table, contact
SAMSON.
To replace the plug and diaphragm, pro-
ceed as described in sections 4.1 and 4.2.
Caution!
Prior to carrying out any work, first
allow the relevant section of the plant
to cool down to ambient temperature
if high temperatures prevail.
Depressurize this section and drain it
depending on the medium.
We recommend that the regulator be
removed from the pipeline for carry-
ing out any work on the regulator.
4.1
Cleaning or replacing the
plug
1. Unscrew the external control line.
Remove the regulator from the pipeline.
2. For Types 45-2 and 45-4, completely re-
lease tension from the spring(s) by turn-
ing the set point adjuster (9) or manual
adjuster (19) counterclockwise.
Maintenance – Replacing parts
For Types 45-1 and 45-2, unscrew the
control line (11).
3. Remove the screws (14) and the com-
plete actuator.
If applicable, remove the set point spring
(8) from the valve body.
4. For DN 15 to 25, unscrew the guide nip-
ple of the plug assembly (3) using a socket
wrench (order no. 1280-3001).
The wrench can be made, for example
from a Gedore screwdriver bit (IN
19-19) by boring a 17 mm hole with a
17 mm diameter into the 19 mm hexa-
gon bit (Fig. 3).
5. For DN 32 to 50, screw out the stopper.
Remove the plug assembly.
6. Clean the seat and plug assembly thor-
oughly. If the plug is damaged, replace
the entire plug assembly.
7. Check the control lines and internal bore
(of Types 45-3 and 45-4) for blockages.
To reassemble the regulator, proceed in
reverse order. Observe the tightening
torques specified in Fig. 1.
Fig. 3 · Socket wrench
17
SW 19
7
EB 3124 EN
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