6.3 Venting the metering pump
With an applied metering backpressure of > 0,05 MPa (0,5 bar), the use of
a multifunction
valve from our product range is recommended. Otherwise the
fitted ball cock (for recommendation, (
Ä
Chapter 5.4.1 ‘Hydraulic installation’
on page 28) must be opened or the metering output must be released
elsewhere.
To ensure an optimal suction performance, the stroke length should be set to
100 % and the maximum stroke frequency.
In the event that pump has no suction or insufficient suction, the correct
connection must be checked.
CAUTION!
Particular caution is required when handling chemical metering media!
Metering media may escape which may cause skin irritation, depending on
their properties. Therefore, before venting, always observe the product
datasheet of the metering medium to prevent any type of injury!
It is only possible to modify the stroke length setting when the pump is running.
1. When using a multifunction valve (see accessory range) for the venting, use the
appropriate operating instructions.
2. When using a ball cock (or another venting device), place a suitable collection vessel
below the venting pipe.
3. Open the ball cock or relieve pump on pressure side.
4. V
entilation can only take place if a non-pressurised metering line is used. In order to
do this, set 3-way valve to bypass and relieve pump on pressure side.
5. Switch device on until material exits metering line free of bubbles.
6. Move 3-way valve to metering position.
7. Close the ball cock (if available/used).
If no metering medium enters the metering pipe, repeat the venting.
CAUTION!
The dosing pump may contain water residues from the factory test in the
dosing head, which can lead to reactions with the used dosing chemistry!
Startup
39 417102233 Rev. 3-03.2019
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