10-2 EB 8222-1 EN
Decommissioning
Î Before attempting to unblock a segment-
ed ball after it has become blocked (e.g.
due to seizing up after remaining in the
same position for a long time), release
any energy (in the actuator) which caus-
es the valve shaft to move.
Risk of personal injury due to exhaust air
being vented from pneumatically operated
components.
While the valve is operating, the actuator,
for example, may vent during closed-loop
operation or when the valve opens or closes.
Î Wear eye protection when working in
close proximity to the control valve.
Risk of personal injury due to residual
process medium in the valve.
While working on the valve, residual
medium can ow out of the valve and,
depending on its properties, cause personal
injury, e.g. (chemical) burns.
Î Wear protective clothing, safety gloves
and eye protection.
To decommission the control valve for service
work or to remove it from the pipeline, pro-
ceed as follows:
1. Close the shut-off valves upstream and
downstream of the control valve to stop
the process medium from owing
through the valve.
2. Completely drain the pipelines and
valve.
3. Disconnect and lock the pneumatic air
supply to depressurize the actuator.
4. Release any stored energy.
5. If necessary, allow the pipeline and valve
components to cool down or warm up to
the ambient temperature.
WARNING
!
WARNING
!
WARNING
!
WARNING
!
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