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permissible
Figure 4: Permissible valve installation positions
4.4 Assembly instructions and fittings
Check the valve for possible damage that it may have suffered
during transport and storage. Protect the valve against dirt cau-
sed on the construction site by adequate covering until instal-
lation. Prior to installation all components essential for proper
function, such as the seat and the diaphragm must be thoroug-
hly cleaned to remove all dirt particles. VAG does not assume
any liability for consequential damage caused by dirt, shot-bla-
sting gravel residues etc.
Should the valves be repainted later on, it must be made sure
that no paint is applied to the functional parts. The identificati-
on plates must not overpainted either. If the equipment is sand-
blasted for cleaning prior to installation, these parts must be
adequately covered. If solvents are used for cleaning, it must
be ensured that the solvents do not destroy the seals of the
pipeline or the valve.
When connecting the valve with the pipeline flanges, hexagon
bolts and nuts with washers from flange to flange must be used
in the through holes.
Fasten the bolts evenly and crosswise to prevent unnecessary
tension and the resulting cracks or breaks. The pipeline must
not be pulled towards the valve. Should the gap between valve
and flange be too wide, this should be compensated by thicker
seals.
We recommend using steel-reinforced rubber seals to DIN EN
1514-1 Shape IBC. If you use flared flanges, these seals are
mandatory.
While the valve is being installed, it must be made sure that the
flanges of the pipeline it is connected to are aligned and level
with each other. Welding works on the pipeline must be perfor-
med before the valves are installed to prevent damage to the
seals and the corrosion protection. Welding residues must be
removed before the equipment is put into operation.
The pipeline must be laid in a way that prevents harmful pipeli-
ne forces from being transmitted to the valve body. Should con-
struction works near or above the valve not be completed yet,
the valve must be covered to protect it from dirt.
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