DUKER 4510 Series Betriebsanleitung - Seite 6
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4 Pressure test on the pipeline
New installed pipelines should be carefully flushed first to wash out all foreign bodies.
Valve open: The test pressure may not exceed the value 1.5 x PN (see valve markings).
Valve closed: The test pressure may not exceed the value 1.1 x PN (see valve markings).
5 Installation into the pipeline
5.1 General information
Only original spare parts from the manufacturer may be installed.
The sealing surfaces of the flanges are designed for mating flanges with smooth sealing
strips, according EN 1092 or Stock Finish according to ANSI B 16.5. Other flange shapes
must be agreed with the manufacturer. Elastomer gaskets according to the DVGW Guidelines
W 270 are recommended, preference is to be given to flange seals with a metal core accord-
ing to EN 1514 Part 1.
The same instructions apply to the installation of Düker butterfly valves in a pipe as for the
connection of pipe elements according to EN 1092 and BS standards. It is assumed that the
corresponding instructions are known and are followed. They are not part of these operating
instructions. The following installation instructions additionally apply to butterfly valves
In order to prevent electrochemical corrosion, the formation of potentials should be avoided
when installed in pipes made of non-corrosive steel. Especially in humid environments, which
lead to condensation on the valve, it is therefore advisable to electrically disconnect the flange
connection elements.
Issue 03
Düker GmbH – www.dueker.de
page 6