1-2 EB 5866 EN
Safety instructions and measures
their specialized training, their knowledge and experience as well as their knowledge of the
applicable standards.
Welding operations must only be performed by personnel who has the necessary qualica-
tion to perform the applied welding procedure and handle the materials used.
Explosion-protected versions of this device must be operated only by personnel who has un-
dergone special training or instructions or who is authorized to work on explosion-protected
devices in hazardous areas.
Personal protective equipment
We recommend wearing the following protective equipment:
− Protective clothing and gloves in applications with hot or cold media
Î Check with the plant operator for details on further protective equipment.
Revisions and other modications
Revisions, conversions or other modications of the product are not authorized by SAMSON.
They are performed at the user's own risk and may lead to safety hazards, for example.
Furthermore, the product may no longer meet the requirements for its intended use.
Safety features
In combination with the Type5825, Type5827-A and Type5827-E Electric Actuators as well
as with the TROVIS5725-3 and TROVIS5725-8 Electric Actuators with Process Controller,
the following safety feature exists: upon failure of the supply voltage, the valve moves to a
dened fail-safe position (see the 'Design and principle of operation' section). The direction
of action of the fail-safe action is dened by the actuator version (see associated actuator
documentation).
In combination with the Type2780 Pneumatic Actuator, the following safety feature exists:
upon failure of the air supply, the valve moves to a certain fail-safe position (see the 'Design
and principle of operation' section). The fail-safe action of the actuator is the same as its
direction of action and is specied on the nameplate of SAMSON actuators (see actuator
documentation).
Warning against residual hazards
To avoid personal injury or property damage, plant operators and operating personnel must
prevent hazards that could be caused in the control valve by the process medium, the operat-
ing pressure, the signal pressure or by moving parts by taking appropriate precautions. Plant
operators and operating personnel must observe all hazard statements, warning and caution
notes in these mounting and operating instructions.
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