Operating Instructions for ERHARD NON SLAM Nozzle Check Valve
Note concerning installation:
Fig. 1.9
We recommend to design the non-return
valve in the nominal size DN of the
delivery side of the pump. (DN of pump =
DN of ERHARD NON SLAM Nozzle
Check Valve.)
Thus, there will be – referred to the
nominal size – a higher flow velocity and
thus an optimum operating performance
(opening degree, economic efficiency). If
the ERHARD NON SLAM Nozzle Check
Valve is mounted directly on the delivery
side of the pump, irregular flow and
vibrations of the ERHARD Check Valve
might have negative effects (releasing
screwed connections, damaging the
seals, spring breaking, and increased
wear and tear of the mobile valve and
bearing components).
Therefore we recommend a distance of
min. 5 – 7 x DN (especially for speed-
controlled pumps) or a minimum velocity
of 2 – 3 m/s for the ERHARD NON SLAM
Nozzle Check Valve in order to ensure
that the valve is fully open.
BA43E000
Juli 2009
Rev.9
ERHARD GmbH & Co. KG
x
D-89502 Heidenheim
x
Postfach 1280
Telefon: (07321) 320-0
(07321) 320 491 E-Mail: info
@
erhard.de
Internet: http://www.erhard.de
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