ECOLAB Elados EMP IV E60 serie Betriebsanleitung Seite 79

For metering in pipelines with underpressure, a pressure control valve
must be built into the metering pipe.
NOTE
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.
Pos. Description
1 Injection valve / metering valve
2 External release
3 Solenoid valve
4 Pressure control valve
The metering point should not be positioned
below the discharge container as this
arrangement creates a risk of the discharge
container being siphoned empty. (see Fig. 7.4).
If such an arrangement cannot be avoided for
configuration-technical reasons, absolutely an
appropriate pressure control valve is to be
inserted. (see Fig. 7.5).
Pos. Description
1 Overflow valve
2
Injection valve / metering valve
3 Pressure control valve
Fig. 7.6 Example 6
When using long metering lines or in the case of an inflexible pipe work, a
pulsation attenuator (pos. 1) should be installed in the pressure line (directly
behind the pressure valve of the metering pump) in order to avoid pressure
strokes.
Fig. 7.7 Example 7
The suction pipes must be kept as short as possible. Long and twisted
suction pipes may lead to air buildup in the system. The max. suction
height is 2 m and the max. flow velocity is 0.3 m/s!
(see also chapter
Fig. 7.8 Example 8
Always lay the suction pipe so that it ascends to the suction valve of
the metering pump.
Fig. 7.9 Example 9
For system designs with a suction tube length of more than about 3 m
and/or that must reach a suction height of > 2 m, an appropriate lifting
vessel must be installed to support the suction process.
The lifting vessel must be positioned above the pump.
Pos. Description
1 Lifting vessel
2
Solenoid valve
417101799_EMP_IV_E60.docx
A pressure control valve or a metering valve is not an
absolutely hermetically sealing shutoff device.
14.3 "Technical specifications "Overview tables"")
Fig. 7.4 Example 4
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Fig. 7.3 Example 3
Fig. 7.5 Example 5
Rev. 11-10.19