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7
Device installation
7.1
Hydraulic installation
7.1.1
Installation examples
The installation must only be performed by authorized personnel and the general
guidelines and local installation regulations must be observed!
Specific measures and protection devices for the metering of dangerous or aggressive
WARNING
chemicals are not provided here.
When using such chemicals, always observe the legal regulations and the relevant
product datasheet.
The installation examples and applications provided here are of a functional nature. They
NOTE
give an overview of installation types which are correct or to be avoided for the correct
functioning of the pump.
A)
The arrangement of the metering pump should preferably be
made on and/or over the metering container.
NOTE
B)
For easy venting of the metering pump with an applied
metering backpressure > 0.5 bar, an appropriate ball valve (4)
be installed in the pressure pipe. The venting pipe should be
led back pressure-free into the container
WARNING
C)
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 (2) 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 (3). 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.
In place of a pressure valve and an overflow valve also a multifunction valve (MFV) from our
NOTE
delivery program can be used.
D)
A spring-loaded injection or metering valve (1) should be installed at the injection point
(including with supplying metered amounts into depressurised systems).
For outgassing media and products with a viscosity of > 100
mPas, flooded suction is recommended.
In using this method, however, ensure that the injection point is
positioned over the discharge container and/or an appropriate
pressure control valve is installed.
These measures prevent the discharge container from being
siphoned empty.
Pos.
Description
1
Injection valve / metering valve
2
Pressure control valve
3
Overflow valve
417101799_EMP_IV_E60.docx
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.
The venting pipe must never be fed back into the
suction line of the metering pump!
- 73 -
Fig. 7.1
Fig. 7.2
Rev. 9-06.11
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