n Install an adjustable back pressure valve in the discharge line
and install a shut-off valve in the suction line, which has to be
closed when the pump is at a standstill (preferably a solenoid
valve).
n If the system is primed from lines with fluctuating pressure, use
an interim tank with a float valve to ensure a regular delivery
flow.
n If the system is primed from a high feed level with fluctuating
pressure, use an interim tank with a float valve to ensure a reg‐
ular delivery 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.
With high suction-side pressure 3
Fig. 19
With fluctuating suction-side pressure
1
Fig. 20
With fluctuating suction-side pressure
2
Fig. 21
With negative pressure in the main
line
Fig. 22
Installation, hydraulic
26
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