Samson 3372 - Removal and Spring Compression Release; Actuator Detachment from Valve

EB 8313-3 EN 11-1
Removal
11 Removal
The work described in this section is only to
be performed by personnel qualied for the
assignment accordingly.
Risk of fatal injury due to the ignition of an
explosive atmosphere.
Incorrect installation, operation or servicing
of the electropneumatic actuator in
potentially explosive atmospheres may lead
to ignition of the atmosphere and cause
death.
Î The following regulations apply to instal-
lation in hazardous areas: EN60079-14
(VDE0165, Part1).
Î Work must only performed by personnel
who has undergone special training or
instructions or who is authorized to work
on explosion-protected devices in haz-
ardous areas.
Risk of bursting due to incorrect opening of
pressurized equipment or components.
Pneumatic actuators are pressure equipment
that may burst when handled incorrectly.
Flying projectile fragments or components
can cause serious injury or even death.
Before working on the actuator:
Î Depressurize all plant sections concerned
and the actuator. Release any stored en-
ergy.
Risk of personal injury due to preloaded
springs.
Actuators with preloaded springs are under
tension. These actuators can be identied by
several longer bolts with nuts protruding
from the bottom diaphragm case. Actuators
with considerably preloaded springs are also
labeled correspondingly (see the 'Markings
on the device' section).
Î Only open the actuator following the
instructions in this document. See
'Relieving the spring compression in the
actuator' in the 'Removal' section.
Risk of personal injury due to exhaust air
being vented.
The actuator is operated with air. As a result,
air is vented during operation.
Î Wear eye and hearing protection when
working near the actuator.
Crush hazard arising from the moving actu-
ator stem.
Î Do not touch the actuator stem or insert
hands or nger into the yoke while the
air supply is connected to the actuator.
Î Before working on the actuator,
disconnect and lock the pneumatic air
supply as well as the control signal.
Î Do not impede the movement of the
actuator stem by inserting objects into
the yoke.
DANGER
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DANGER
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WARNING
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WARNING
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WARNING
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WARNING
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WARNING
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