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Î Allow components and pipelines to cool
down or warm up to the ambient tem-
perature.
Î Wear protective clothing and safety
gloves.
WARNING
WARNING
!
!
Crush hazard arising from actuator and
plug stem moving.
Î Do not insert hands or finger into the
yoke while the air supply is connected to
the actuator.
Î Before working on the control valve, dis-
connect and lock the pneumatic air sup-
ply as well as the control signal.
Î Do not impede the movement of the actu-
ator and plug stem by inserting objects
into the yoke.
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.
WARNING
WARNING
!
!
Risk of personal injury due to residual pro-
cess medium in the valve.
While working on the valve, residual me-
dium can flow out of the valve and, depend-
ing on its properties, cause personal injury,
e.g. (chemical) burns.
Î Wear protective clothing, safety gloves,
respiratory protection and eye protec-
tion.
EB 8822 EN
WARNING
!
Risk of personal injury due to preloaded
springs.
Actuators with preloaded springs are under
tension. They can be identified by the long
bolts protruding from the bottom of the actu-
ator.
Î Before starting any work on the actuator,
relieve the compression from the pre-
loaded springs.
Before removing the valve, make sure the fol-
lowing conditions are met:
− The control valve is put out of operation
(see section 10).
11.1 Removing the valve from
the pipeline
1. Support the valve to hold it in place
when separated from the pipeline (see
section 4).
2. Version with threaded ends: Unscrew
the valve from the pipeline.
Version with flanges: Unbolt the flange
joint.
3. Remove the valve from the pipeline (see
section 4).
11.2 Removing the actuator
from the valve
See associated actuator documentation.
Removal
47
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