417101774_EMP_KKS_E60_E.doc - 12 - Rev. 8-03.10
7 Device installation
7.1 Hydraulic installation
7.1.1 Installation examples
)
NOTE
The installation examples and applications provided here are of a functional nature. They
give an overview of installation types which are correct or to be avoided for the correct
functioning of the pump.
WARNING
Specific measures and protection devices for the metering of dangerous or aggressive
chemicals are not provided here.
When using such chemicals, always observe the legal regulations and the relevant product
datasheet.
A) The arrangement of the metering pump should
preferably be made on and/or over the metering
container.
NOTE
For media with a tendency towards
sedimentation, the bottom admisson
valve or foot valve of the suction line /
suction lance must be fitted above the
anticipated layer of sludge.
B) Between the back-pressure in the injection point and
the pressure at the metering pump a positive difference
of pressure must prevail of at least 1 bar. If this is not
the case, a pressure control valve must be built into the
metering line.
In addition it recommends to install itself for the
avoidance of inadmissibly high pressures in the
metering line an appropriate safety overflow valve. The
by-pass pipe of this valve should be led back pressure-
free into the container.
WARNING
The overflow line never be fed back into
the suction line of the metering pump.
C) In the injection point in principle a spring-tensioned
injector or metering valve should be inserted (also
during a metering into pressure-free systems).
Fig. 7.1
For metering in pipelines with underpressure, a pressure
control valve must be built into the metering pipe.
NOTE
A pressure control valve or a metering
valve is not an absolutely hermetically
sealing shutoff device.
To prevent the running out of the metering medium when
the pump is stopped, we also recommend the fitting of a
solenoid valve which is approved for use with the pump.
Fig. 7.2
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