n If the system is primed from a high feed level with fluctuating pressure,
use a hopper with a float valve to ensure a regular discharge flow.
n When metering into a main line, in which there is negative pressure,
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.
n When metering suspensions, use flushing equipment (see Product
Catalogue Chapter 1.8) to prevent deposits in the liquid end.
1 Rinsing water
2 Flushing equipment
There are two versions of flushing equipment:
n Manual flushing equipment
n Automatic flushing equipment
There are two flushing principles:
n Flushing when metering is interrupted (intermittent flushing)
n Flushing when metering is finished.
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!
With fluctuating suction-side pressure 2
Fig. 24
With negative pressure in the main line
Fig. 25
With danger of deposits in the liquid end
Fig. 26: Manual flushing equipment
Fig. 27: Automatic flushing equipment
Installation, hydraulic
16
To Next Page
Loading...
Need help?
General
