Decommissioning - Samson 3274 Mounting And Operating Instructions

11 Decommissioning

The work described in this section is only to
be performed by personnel appropriately
qualified to carry out such tasks.
DANGER
!
Risk of fatal injury due to electric shock.
Î Before disconnecting live wires, switch
off the supply voltage at the actuator and
protect it against unintentional reconnec-
tion.
WARNING
!
Risk of personal injury due to residual
process 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
and eye protection.
WARNING
!
Risk of burn injuries due to hot or cold
components and pipeline.
Valve components and the pipeline may be-
come very hot or cold. Risk of burn injuries.
Î Allow components and pipelines to cool
down or warm up to the ambient tem-
perature.
Î Wear protective clothing and safety
gloves.
EB 8340 EN
To decommission the electrohydraulic actua-
tor for repair work or disassembly, proceed
as follows:
Î Put the control valve out of operation (see
associated valve documentation).
Î Retract actuator stem.
Î Disconnect the supply voltage and pro-
tect it against unintentional reconnection.
Î Make sure that a signal from the control-
ler cannot act upon the actuator.
Note
For versions with "actuator stem extends"
fail-safe action, the supply voltage must re-
main connected to prevent the actuator stem
extending by itself.
Decommissioning
11-1