For metering in pipelines with under pressure, 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.
Injector valve / Metering valve
Fig. 7.3 Hydraulic installation: installation examples 3
The metering point should not be positioned below the discharge
container as this arrangement creates a risk of the discharge
container being siphoned empty.
Injector valve / Metering valve
Fig. 7.4 Hydraulic installation: installation examples 4
The suction pipes must be kept as short as possible.
Long and twisted suction pipes may lead to air build-up in the system.
The max. suction height is 2 m and the max. flow velocity is 0.3 m/s!
(see also chapter 14 “Technical Specifications“)
Fig. 7.5 Hydraulic installation: installation examples 5
Always lay the suction pipe so that it ascends to the suction valve of the
metering pump.
Fig. 7.6 Hydraulic installation: installation examples 6
Installation of a metering monitoring system:
A metering monitoring system – oval gear meter (Pos.1) or flow
indicator - has to be installed in the metering pipeline between the
pressure relieve valve and the pressure control resp. metering valve.
Fig. 7.7 Hydraulic installation: installation examples 7
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