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Original document - Mi-205 EN Edition: 2021-04
5.2 Installation of the valve in the pipeline
Attention!
The installation of the butterfly valve is usually made with full installed actuator. The assembly
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.
Mounting in horizontal pipes
How SOMAS valves are mounted in a horizontal pipe can depend on a variety of factors like the
media, the application as such and available space.
SOMAS valves (ball valves, segmented valves and butterfly valves) should generally be mounted:
•
In the first place with the shaft horizontally
•
If it is necessary to deviate from above, the spindle should point upwards in the upper half plane
•
For media that has a thick ”bottom fraction” that can accumulate in the lower shaft bearing,
avoid mounting with the shaft straight up or near straight up
•
Mounting with the shaft pointing down in the lower half plane should be avoided, and especially
mounting with the shaft straight down
•
If there are strong reasons for choosing the mountings that contradict the instructions above,
SOMAS should be contacted to evaluate the risks associated with these mountings
The direction of flow is indicated with arrows on the valve body. Fix the pipeline correctly to prevent
the exertion of external forces on the valve.
Note
The prefered flow direction is shown with arrows on the valve body (➔ Fig.5-2). The medium
should impact on the flat side of the disc.
End of line-installation of the valve is only permitted after approval from SOMAS.
Fig.5-2 Prefered flow direction marking
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