Ecolab EMP KKS E60 Manuel D'utilisation page 169

Hydraulic installation: Installation example 1
WARNING!
The overflow line never be fed back into the suction line of the metering pump.
NOTICE!
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 (pos. 3) which is approved for use with the
pump.
Pos. 1
Pos. 2
Pos. 3
Pos. 4
33
Device installation
In the injection point in
principle a spring-tensioned
injector or metering valve
should be inserted (also
during a metering into
pressure-free systems).
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 0.1 MPa
(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.
For metering in pipelines
with under pressure, a
pressure control valve must
be built into the metering
pipe.
417101442 Rev. 12-02.2019