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Decommissioning
WARNING
!
Risk of hearing loss or deafness due to loud
noise.
Noise emission (e.g. cavitation or flashing)
may occur during operation caused by the
process medium and the operating condi-
tions.
Î Wear hearing protection when working
near the regulator.
WARNING
WARNING
!
!
Crush hazard arising from moving parts.
The electric actuator contains moving parts
(actuator and plug stems), which can injure
hands or fingers if inserted into the actuator.
Î Do not insert hands or finger into the
yoke while the valve is in operation.
Î Disconnect the supply voltage and pro-
tect it against unintentional reconnection
before performing any work on the con-
trol valve.
Î Do not impede the movement of the actu-
ator or plug stem by inserting objects in-
to their path.
Î Before unblocking the actuator and plug
stem after they have become blocked
(e.g. due to seizing up after remaining in
the same position for a long time), re-
lease any stored energy in the actuator
(e.g. spring compression). See associat-
ed actuator documentation.
Î Before starting any work on the regula-
tor, depressurize plant sections as well as
the regulator.
10-2
WARNING
WARNING
!
!
Risk of personal injury due to residual pro-
cess medium in the regulator.
While working on the regulator, residual
process medium can escape and, depending
on its properties, may lead to personal in-
jury, e.g. (chemical) burns.
Î Wear protective clothing, safety gloves
and eye protection.
Note
Refer to the mounting and operating instruc-
tions of the electric actuator for more details
(see documents listed under 'Referenced doc-
umentation' in the 'Safety instructions and
measures' section).
To decommission the regulator for service
work or disassembly, proceed as follows:
1. Disconnect the supply voltage from the
electric actuator (see documents listed
under 'Referenced documentation' in the
'Safety instructions and measures' sec-
tion).
2. Close the shut-off valve (1) on the up-
stream side of the regulator.
3. Close the shut-off valve (6) on the down-
stream side of the regulator.
4. Completely drain the pipelines and
valve.
5. Depressurize the plant.
6. If necessary, allow the pipeline and reg-
ulator components to cool down or warm
up to the ambient temperature.
EB 3018 EN
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