Cleaning And Maintenance; Replacing The Operating Diaphragm - Samson 41-23 Mounting And Operating Instructions

6 Cleaning and maintenance

See Fig. 1 on page 7.
The regulator does not require any mainte-
nance. Nevertheless, it is subject to natural
wear, particularly at the seat, plug and oper-
ating diaphragm.
Depending on the operating conditions,
check the regulator at regular intervals to
avoid possible malfunctions. Details on faults
and how to remedy them can be found in
Table 3.
WARNING!
Before performing any work on the
regulator, make sure the relevant
plant section has been depressurized
and, depending on the process medi-
um, drained as well. We recommend
removing the valve from the pipeline.
When used at high temperatures, al-
low the plant section to cool down to
ambient temperature.
Disconnect or shut off the control line
to prevent the risk of moving regula-
tor parts. As valves are not free of
cavities, remember that residual pro-
cess medium might still be contained
in the valve.
6.1 Replacing the operating
diaphragm
If the downstream pressure deviates consid-
erably from the set point, check if the dia-
phragm is leaking and, if necessary, replace
it as follows.
EB 2512 EN
Cleaning and maintenance
− Shut down the plant by slowly closing the
shut-off valves. Depressurize the relevant
section of the pipeline and, if necessary,
drain it as well.
− Unscrew the control line (17) and clean
it.
− Loosen the bolts (15) at the actuator and
remove the casing.
− Unscrew the nut (14) and lift off the dia-
phragm plate (13).
− Replace the operating diaphragm (12)
with a new one.
− Proceed in the reverse order to reassem-
ble the regulator. For start-up, proceed
as described in section 5.1.
Tighten the bolts (15) with max. tightening
torque of 25 Nm. Tighten the nuts (14) with
max. tightening torque of 40 Nm. During as-
sembly, apply Loctite 272 sealant (SAMSON
order no. 8121-4000) to the bottom section
of thread on the actuator stem during assem-
bly.
NOTICE: this does not apply to version for
oxygen service or the FDA-compliant ver-
sion.
NOTICE
Make absolutely sure that no torque
is applied to the bellows seal (5.1)
during assembly or disassembly.
Otherwise, the metal bellows will be
destroyed. On disassembling the
valve, push the anti-rotation clip (20
in Fig. 1) to "entriegelt" (unlock).
Push it back again to "verriegelt"
(lock) on reassembly. See also the
note on the crossbeam (8).
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