DUKER 451 Instrukcja obsługi - Strona 6

Przeglądaj online lub pobierz pdf Instrukcja obsługi dla Jednostka sterująca DUKER 451. DUKER 451 19 stron. Resilient seated butterfly valves

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).

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 04

Düker GmbH – www.dueker.de

page 6