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Edition: 2021-04 Original document - Mi-205 EN
6 Maintenance
6.1 Disassembly of the butterfly valve from pipeline
Attention!
The disassembling of the butterfly valve is usually made with full installed actuator. The
disassembly is made by closing spring loaded and double acting actuators with closed butterfly
valve, by opening spring loaded actuators with open butterfly valve.
At opening spring loaded actuators, a short adapter with additional flanges is to be installed in
the pipeline immediately in front of and behind the valve.
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!
Inform yourself of the properties of the medium. Protect yourself and your environment from
hazardous or poisonous substances.
Observe the safety instructions in the safety data sheets of the manufacturers.
Ensure that no medium can enter the pipeline during maintenance work.
Warning!
Do not remove the valve from the line as long as the valve is under pressure!
Dismantling or disassembly of a valve under pressure leads to an uncontrolled pressure drop.
Always isolate the relevant valve in the pipeline system; depressurise the valve and remove the
medium before working on the valve.
Warning!
When transporting and handling the valve, observe the weight of the valve or of the whole unit.
Never lift the valve by its positioner, limit switch, solenoid valve or piping. Place the hoisting
ropes securely according to lift instruction.
The valve or parts thereof may injure persons if dropped.
Do not walk under suspended loads.
Procedure MTV
1. Seal off the pipeline section containing the butterfly valve.
2. Depressurise the sealed off pipeline section.
3. Drain the pipeline section.
4. If necessary purge the pipeline section.
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