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4.4 Assembly instructions and fittings
Check the valve for possible damage that may have occurred dur-
ing transport or storage. Protect the valve against dirt from the
construction site by adequate covering until installation. Prior to
installation all components essential for proper function, such as
the disk and the seals must be thoroughly cleaned to remove all
dirt particles. VAG does not assume any liability for consequential
damage caused by dirt, shot-blasting gravel residue etc.
The function parts should be checked for proper operation prior
to installation.
Should the valves be repainted later on, it must be ensured that
no paint is applied to the functional parts. The identification plates
must not be painted over either. If the equipment is sand-blasted
for any reason prior to installation, these parts must be adequately
covered. If solvents are used for cleaning, you should ensure that
they do not damage the seals of the pipeline or the valve.
For the assembly of the VAG CEREX
ensure that proper load suspension devices as well as means of
transport and lifting devices are available.
The valve is installed in the pipeline with the disk slightly open.
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 performed be-
Screw length = 1/2 Face to face length + flange thickness
Figure 10: Inserting the valve into the pipeline
fore the valves are installed to prevent damage to the seals and
the corrosion protection. Welding residues must be removed be-
fore the equipment is put into operation.
The pipeline must be laid in a way that prevents harmful pipeline
forces from being transmitted to the valve body. Should construc-
tion works near or above the valve not be completed yet, the valve
must be covered to protect it from dirt.
When CEREX
300 Butterfly Valves with profiled seals are in-
®
stalled, no additional seals must be used.
When installing the valve in an assembled pipeline make sure that
the space between the pipeline flanges is wide enough to prevent
300 Butterfly Valve you must
®
damage to the sealing faces of the profiled seal while the valve is
being assembled between the pipeline flanges.
However, this space must not be too large to prevent the genera-
tion of additional tensions in the pipeline while the flange connec-
tion is being fastened. While installing it, carefully centre the valve
via the flange bolts.
Flange bolts should be fastened evenly and crosswise. This en-
sures evenly distributed pressure on the profiled seal and thus the
tightness of the valve.
The tightening torques of the flange bolts should ensure that the
butterfly valve and the counter-flanges are fastened so that they
form a "block" (metal-to-metal). This is the only way to guarantee
that the profiled seal seals properly on the flanges of the body.
Figure 11: Cross-wise fastening of the bolts
5
Set-up and operation of the valve
5.1 Visual inspection and preparation
Before putting the valve and the equipment into operation, per-
form a visual inspection of all functional parts. Check whether all
bolted connections have been properly fastened.
For proper assembly, storage and transport the valves are factory-
lubricated. Depending on their condition when they are to be put
into operation, the valves may have to be lubricated again. If the
valve is installed in a drinking water pipeline, lubricants must be
used which are approved for use with foodstuffs or drinking water.
• Profiled seal and O-rings: KLÜBERSYNTH VR 69-252
(with KTW approval for drinking water)
Manufacturer: Klüber Lubrication München AG
5.2 Function check and pressure test
Prior to installation, the function parts of the valve have to be
opened and closed completely at least once and should be
checked for trouble-free operation.
The pressure test of the valves has already been performed in the
VAG Operation and Maintenance Instructions • 10
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