4 of 9
Specifications subject without notice
Edition: November 2017
Operating instructions BA 10a-02_EN
Warning
Preventing misuse of the shut-off butterfly valve:
It is especially important to make sure that the selected lining for wetted parts in the shut-off butterfly valve is
suitable for the media used as well as the prevailing pressures and temperatures.
Failure to follow these safety precautions may result in personal injury and can damage equipment
installed in the pipeline. The manufacturer does not assume any final responsibility.
Danger
The valve should only be operated and serviced by personnel appropriately qualified for pressurized pipelines:
Skilled staff in the sense of these operating instructions is persons who, as a result of their training, their
knowledge and their experience, as well as their knowledge of the relevant standards, are able to judge the tasks
assigned to them and are able to recognize possible dangers.
A gear mounted subsequently onto the valve must fit the shut-off butterfly valve properly and its final positions, especially
the open position, need to be correctly adjusted.
Make sure that the pipeline and control equipment have been installed correctly and are checked at regular intervals. The
valve body wall thickness must be designed to take into account an additional load Fz in the usual order
(Fz = π/4•DN²•PS) for a correctly sized pipeline.
The valve needs to be connected correctly to the pipeline and to the control equipment.
Make sure the usual flow velocities are not exceeded in continuous service in this pipeline. Exceptional operating
conditions such as oscillations, water hammering, cavitation and large proportions of solid matter in the process medium,
especially abrasive, must be clarified beforehand with the manufacturer.
Warning
We recommend to
open
and
close
the valve regularly. Depending on the valve model, we recommend opening
and closing the valve at least once a year.
Depending on how long the valve remains in one position, breakaway and operating torques may differ
considerably than those specified in the data sheet.
Attention
For double eccentric valves:
Make sure, that the butterfly disc is always operated within a range of between 0° - 90°. Turning the butterfly valve
over 0° leads to irreparable damage to the sealing ring e.g. sealing strip, this must therefore be avoided.
Shut-off butterfly valves that are operated at temperatures greater than +50°C or lower than -20°C must be protected,
together with the pipeline connections, against being touched.
2.3
Particular hazards
Danger
Prior to unscrewing the bonnet or removing the shut-off butterfly valve from the pipeline, relieve pressure entirely
in the pipeline to ensure the process medium cannot escape uncontrollably from the pipeline.
Warning
Should it be necessary to remove a shut-off butterfly valve from the pipeline, process medium may escape from
the pipe or out of the shut-off butterfly valve. In the case of process media that can damage health or are
dangerous, drain the pipeline completely before removing the shut-off butterfly valve from the pipeline.
Take special care concerning any remaining media that may still be in the pipeline or have collected in the cavities
of the valve.
Warning
Only unscrew or loosen any screws or bolts connecting the body parts after the valve has been removed from the
pipeline. Tighten the screws on reassembly with a torque wrench according to repair instructions <
EB10a
or
EB10e
>.
Warning
For shut-off butterfly valves intended for dead-end service:
During standard operation, in particular, with gases or hot and/or dangerous media, mount a blank flange at the
free end connection or ensure that the shut-off butterfly valve is properly protected against unauthorized
operation.
Warning
If a shut-off butterfly valve used for dead-end service must be opened in a pressurized pipeline, special care must
be taken to ensure that any process media escaping under pressure do not cause any damage.
Take into consideration that in most cases the process medium is a dangerous substance!