SOMAS MTV - Safety Instructions for Butterfly Valves

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Edition: 2021-04 Original document - Mi-205 EN
2.5 Safety instructions for butterfly valves
Operation of the butterfly valve is always subject to the local safety and accident
prevention regulations.
Danger!
Risk of injury!
Observe movements of the disc.
Keep hands, tools and other objects away from the area where the disc moves when the
actuator is connected to compressed air system. Single action actuators may move to “open”
or “closed” position without being connected to the air system.
Warning!
Before carrying out maintenance or repair work on the butterfly valve with actuator or
installation and removal of the butterfly valve from the pipeline, always disconnect the
compressed air supply to the actuator.
Single action actuators may move to “open” or “closed” position without being connected
to the air system.
Warning!
Ensure that personnel who work with, install or repair the butterfly valve are appropriately
trained. This prevents unnecessary damage and accidents or injury to personnel.
The maintenace and assembly personnel must be familiar with the process of installing and
disassembling the butterfly valve in a process line, the special and possible risks of the process
and the most important safety regulations.
The repair and assembly personnel must be familiar with the risks when handling pressurised
equipment, hot and cold surfaces, dangerous substances and substances which represent
a hazard to health.
Warning!
Do not exceed the design data of the butterfly valve!
Exceeding the design data marked on the butterfly valve may lead to damage and uncontrolled
escape of the pressurised medium.
Both the damage as such and the pressurised medium may lead to injuries to personnel.
Warning!
Do not remove the butterfly valve from the line as long as it is pressurised!
Dismantling or disassembly of a pressurised butterfly valve leads to an uncontrolled loss of
pressure. Always isolate the relevant butterfly valve in the pipe system; despressurise the
butterfly valve and remove the medium before working on the butterfly valve.