DUKER 305 Betriebsanleitung - Seite 14
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Seite drucken10. Maintenance and trouble shooting
Consider this chapter always together with chapter 5.5 (Operation)
Regular maintenance intervals on hydrants are not required. We recommend to control the
function, drainage and tightness of the hydrant at the latest every 4 years.
We refer to the DVGW Leaflet W 392, Table 2, No. 2.
When flushing the hydrant, in any case the use of a standpipe with connected hose to
discharge the flushing water is necessary. Never flush the hydrant free into the surface box.
In case of flushing of the hydrant without standpipe, dirt and pollution from the surface box
can be sluiced into the hydrant and create problems with the water hygiene or plugging the
drainage outlet.
To avoid the generation of to high pressure in the upper part of the column, never close the
hydrant while the side valves of the standpipe are closed.
Furthermore please observe the procedure for the operation of underground fire hydrants,
which is given in annex "A" of the DVGW Leaflet W 331.
Turning the stemcap anti-clockwise will open, whereas turning clockwise will close the
hydrant.
To operate the hydrant the use of operation keys according to DIN 3223 is recommended.
The keys are designed to ensure that normal manual force is sufficient for operation.
The additional use of key extensions to increase the operation torque s not allowed as this
will damage the valve internally.
Hydrants are open-close valves and not designed to regulate the water flow. To avoid
excessively high flow verlocities or cavitation, the obturator should always be opened up to
the mechanical end stop "Open" even during flushing. As a rule, the side valves of the
standpipe or distributor must be used to regulate the flow rate.
=> Throttling or intermediate positions of the obturator during water flow are not
allowed!
To guarantee the proper function and the adherence to the hygienic
requirements for potable water, the use of Düker genuine spare parts is
stipulated.
The distribution and reproduction of these Operating Instructions, utilization and communication of their contents to
others is authorized exclusively for the purpose of ensuring the correct installation and operation of the Düker product
treated in the document. For all other purposes, distribution, reproduction and utilization of the contents, also in
excerpts, is prohibited. Offenders will be held liable for the payment of damages. All rights reserved in the event of
the grant of a patent, utility model or design.
01/042017
Düker GmbH, www.dueker.de
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