ProMinent delta General Operating Instructions page 16

Installation, hydraulic
With fluctuating suction-side pressure 2
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Fig. 24
With negative pressure in the main line
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Fig. 25
With danger of deposits in the liquid end
Fig. 26: Manual flushing equipment
3
Fig. 27: Automatic flushing equipment
16
If the system is primed from a high feed level with fluctuating pressure,
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use a hopper with a float valve to ensure a regular discharge flow.
When metering into a main line, in which there is negative pressure,
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install a multifunctional valve, a back pressure valve (DHV-RM) or an
injection valve in the discharge line to ensure that the feed chemical is
not sucked through.
When metering suspensions, use flushing equipment (see Product
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Catalogue Chapter 1.8) to prevent deposits in the liquid end.
1 Rinsing water
2 Flushing equipment
1
2
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There are two versions of flushing equipment:
Manual flushing equipment
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Automatic flushing equipment
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There are two flushing principles:
1
Flushing when metering is interrupted (intermittent flushing)
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2
Flushing when metering is finished.
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CAUTION!
Problems may arise if flushing cannot be performed cor‐
rectly.
– Ensure that the metering pump is idle during flushing.
– Do not exceed the maximum permitted flushing pressure
of 2 bar!