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Maintenance – Replacing parts
4
Maintenance – Replacing
parts
The regulator is maintenance free. Neverthe-
less, it is subject to natural wear, particularly
at the seat, plug and operating diaphragm.
Depending on the operating conditions that
prevail, inspect the regulator at regular
intervals to avoid possible 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, proceed
as described in sections 4.1 and 4.2.
NOTICE
Prior to carrying out any work on regulator
remove it from the pipeline. Depressurize this
section and drain it depending on the me-
dium.
First allow the relevant section of the plant to
cool down to ambient temperature if high
temperatures prevail.
4.1
Cleaning or replacing the
plug
1. Unscrew the external control line (11).
Remove the regulator from the pipeline.
2. For Type 46-6, completely release ten-
sion from the spring(s) by turning the set
point adjuster (10) or manual ad-
juster (19) counterclockwise.
3. Unthread the screws (15) and remove the
actuator from the valve body.
16
EB 3130 EN
The entire bottom section must be
exchanged in versions with manual ad-
juster manufactured until the start of
1998.
4. For DN 15 to 25, unscrew the guide nip-
ple with the plug section (3) using a
socket wrench (order no. 1280-3001).
For DN 32 to 50, first unscrew stopper
and pull out the plug section.
5. Clean the seat and plug assembly thor-
oughly. Check the control line for block-
age.
If the plug is damaged, replace the entire
plug section.
6. To reassemble the regulator, proceed in
reverse order. Observe the tightening
torques specified in Table 1 in Fig. 2.
4.2
Replacing the diaphragm
1. Unscrew the control line (11). Remove the
regulator from the pipeline.
2. For Type 46-6, completely release the
tension from the spring(s) by turning the
set point adjuster (10) or manual ad-
juster (19) counterclockwise.
3. Undo the screws (15). Remove the lower
diaphragm case including the operating
diaphragm (6.1) and diaphragm plates.
4. Hold the bottom nut (6.4) stationary and
unscrew the nut (6.3).
5. Replace the diaphragm and screw tight
nut (6.3) (tightening torque of 22 Nm).
6. To reassemble the regulator, proceed in
reverse order. Observe the tightening
torques specified in Table 1 in Fig. 2.
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