3.4
Information on the discharge-side installation
n Install a vacuum breaker if the feed chemical may not press through
the metering pump. A metering pump is not an absolutely leak-tight
shut-off device.
n Install the injection valve at the injection point to prevent unwanted
mixing of water and feed chemical in the discharge line.
n A relief valve with a return into the storage tank is useful as overload
protection for the discharge line, for example install a ProMinent
®
mul‐
tifunctional valve.
n Dampen pressure peaks with a metering stroke with long discharge
lines with a pulsation dampener or increase the pipe cross-section.
* Ventilation line with pressure vessels
PD Pulsation damper
n Dampen the pulsations with a pulsation dampener in order to avoid
metering errors, premature wear and tear and damage to the metering
system.
* Ventilation line with pressure vessels
PD Pulsation damper
Fig. 11
With return from the main line
Fig. 12
Avoid exceeding maximum permissible
operating pressure
Fig. 13
Fig. 14
With pulsations caused by acceleration
inertial forces
Fig. 15
Installation, hydraulic
13
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