Removal - Samson 3349 Mounting And Operating Instructions

11 Removal

The work described in this section is only to
be performed by personnel appropriately
qualified to carry out such tasks.
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.
WARNING WARNING
! !
Crush hazard arising from actuator and
plug stem moving in pneumatic control
valves with Type 3271 or Type 3277
Actuator.
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,
disconnect and lock the pneumatic air
supply as well as the control signal.
Î Do not impede the movement of the
actuator 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.
EB 8048-2 EN
WARNING 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,
respiratory protection and eye protec-
tion.
WARNING
!
Risk of personal injury due to preloaded
springs.
Actuators with preloaded springs are under
tension. This can be identified by the long
bolts protruding from the bottom of the
Type 3271 or Type 3277 Pneumatic Actua-
tors.
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 the 'Decommissioning' section).
Removal
11-1