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If the valve is installed in the open, it must be protected against
extreme atmospheric influences (e.g. formation of ice etc.) by ad-
equate covers.
If the valve is installed as an end-of-line valve, it must be made
sure that the free outlet side cannot be accessed by humans.
Attention!! The pressure on the closed valve must not exceed its
nominal pressure (see KAT-A 1331).
To ensure the trouble-free function and long service life of the
valve, several factors have to be taken into account when posi-
tioning the valve.
4.2.1 Installations in the pipeline upstream
and downstream of the valve
• If the valve is used in contaminated media, a filter with a suitable
mesh size must be provided upstream of the valve in order to
Figure 7: Installation of the VAG CEREX
Figure 8: Installation of the VAG CEREX
unfavourable installation position
The disk is caused to vibrate
300 Butterfly Valve at elbows and branches
®
300 Butterfly Valve downstream of control valves
®
prevent malfunction.
• Directly upstream of (3 x DN) and downstream of (3 x DN) a VAG
CEREX
Butterfly Valve an inspection valve, an elbow, T-pieces
®
and Y-filters should be provided as otherwise irregular flow may
disturb the proper function of the VAG CEREX
• Branches and elbows may cause the disk to vibrate.
• A damping zone between the branch/elbow and the valve is
ideal.
• When installing a butterfly valve downstream of a control valve
or a plunger valve, make sure that there is enough space be-
tween them (minimum 10 x DN) (see Figure 8).
• If the required damping zone cannot be observed, turbulences
in the flow may lead to vibrations of the disk, which will shorten
the service life of the valve.
favourable installation position
By turning the valve by 90°, the
flow against the disk is improved
3 X DN
ideal installation position
A distance of ideally 3 x DN
allows vibration-free operation
minimum 10 x DN
Butterfly Valve.
®
VAG Operation and Maintenance Instructions • 8
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