10-2 EB 5866 EN
Decommissioning
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),
release any stored energy in the actuator
(e.g. spring compression). See
associated actuator documentation.
Risk of personal injury due to exhaust air
being vented (Type3222/2780 Pneumatic
Control Valve).
While the valve is operating, air is vented
from the actuator, for example, 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 process
medium can escape and, depending on its
properties, may lead to personal injury, e.g.
burns.
Î Wear protective clothing, safety gloves
and eye protection.
To decommission the control valve for disas-
sembly, proceed 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 or supply voltage to depressurize
or de-energize the actuator.
4. Release any stored energy.
5. If necessary, allow the pipeline and valve
components to cool down.
WARNING
!
WARNING
!
WARNING
!
WARNING
!
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