14
15
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min 450 mm
NOTE:
Do not use the valve at the end of the pipeline – a blank flange must always be installed
after the valve (see Figures 16 and 17.).
When the valve is installed at the end of the pipeline, there is a risk of corrosion-causing oxygen-rich
water or air collecting in the empty rear side of the valve. To prevent corrosion, the space after the valve
must be filled with oxygen-free water.
NOTE:
If the valve is located near to the blind flange at the end of the pipeline, valve must not be
fully closed. Instead the valve must remain slightly open to prevent a closed space from
forming between the valve and blind flange. If water in the closed space expands
(for example due to temperature), it may damage the valve.
Figure 17. Blank flange.
Min. 450 mm pipe must be installed between
the valve and the blank flange.
Figure 16. Do not use the valve at the end
of the pipeline.
4.4 Installation at end of pipeline