movable bolts can be checked by means of the slot located in
the intermediate column (Picture 7), and should be turned in or
turned out to the corresponding final position in each case.
The handwheel is secured against inadvertent operation by me-
ans of a bolt which needs to be secured with a padlock (Picture
8). This locks the handwheel so that it cannot be turned.
Depending on the water quality, deposits may form on the
sealing seat in the body. These deposits in turn can slightly im-
pair the disk reaching its closed position. We therefore recom-
mend moving the valve into closed position at least once per
year and checking the safety interlock for proper function.
It must furthermore be ensured that the locking pin is only opera-
ted when the valve is closed, and that neither the handwheel nor
the actuator of the valve are operated when the valve is locked.
4.1 Conditions required on site
When installing the valve between two pipeline flanges, these
must be coplanar and in alignment. If the pipes are not in align-
ment, they must be aligned before installation of the valve, as
otherwise this may result in impermissibly high loads acting on
the valve body during operation, which may eventually even lead
to fracture.
When installing the valve into the pipeline, make sure
it is as tension-free as possible. The pipeline forces
transmitted to the valve must not exceed the values
specified in EN 1074-2. The space between the flan-
ges must be large enough so as not to damage the
coating of the raised face of the flange during instal-
lation. The flanges of the pipeline must not be pulled
towards the valve during installation.
In case of works around the valve causing dirt (e.g. painting, ma-
sonry or working with concrete), the valve must be protected by
adequate covering.
For assembly in drinking water pipelines, suitable sealing mate-
rials, lubricants and process materials must be used which are
approved for use in drinking water pipelines.
Before putting the valve into operation, clean and purge the cor-
responding pipeline sections.
4.2 Installation location
The installation location of the valve must be selected to provide
sufficient space for function checks and maintenance works (e.g.
dismantling and cleaning of the valve).
If the valve is installed in the open, it must be protected against
extreme atmospheric influences (e.g. formation of ice) by ade-
quate covers.
If the VAG EKN
®
Butterfly Valve is installed underground, the
gear must be equipped with a cover for buried installation.
In case of submerged installation, increased actuation forces
and increased wear and tear (sometimes also accompanied by
corro-sion) of the relatively moving parts are to be expected. This
must be taken into account when determining the maintenance
inter-vals.
If the valve is installed as an end-of-line valve, it must be ensu-
red that its free outlet side is not accessible to interference from
any source.
Valves with UVV safety interlocks or valves equipped with elec-
tric or pneumatic actuators or hydraulic brake-and-lift units are
generally unsuitable for buried installation. The standard versions
of VAG EKN
®
Butterfly Valves are not suitable for submerged in-
stallation.
Attention:
The pressure exerted on the closed valve must not
exceed its nominal pressure (see KAT 1310-A).
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 suita-
ble mesh size must be provided upstream of the valve in order
to prevent malfunction.
Picture 7: VAG EKN
®
Butterfly Valve with UVV safety interlock
Picture 8: VAG EKN
®
Butterfly Valve with UVV safety interlock, secured
by a bolt and a padlock
VAG Operation and Maintenance Instructions • 8
4 Installation into the pipeline
open position
closed
position
