ProMinent EXtronic EXBb Operating Instructions Manual page 26

Installation, hydraulic
With high suction-side pressure 3
P_MAZ_0015_SW
Fig. 19
With fluctuating suction-side pressure
1
P_MAZ_0016_SW
Fig. 20
With fluctuating suction-side pressure
2
P_MAZ_0010_SW
Fig. 21
With negative pressure in the main
line
P_MAZ_0010_SW
Fig. 22
26
Install an adjustable back pressure valve in the discharge line
n
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).
If the system is primed from lines with fluctuating pressure, use
n
an interim tank with a float valve to ensure a regular delivery
flow.
If the system is primed from a high feed level with fluctuating
n
pressure, use an interim tank with a float valve to ensure a reg‐
ular delivery flow.
When metering into a main line, in which there is negative
n
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.