n
The metering pump should prime at 100% stroke length, as the
priming lift depends on the stroke volume when the liquid end
is empty. If the metering pump has to prime at a smaller stroke
length and is not priming, reduce the priming lift (e.g. briefly lift
up the tank with the feed chemical).
n
SEK-type only: The suction lift corresponds to the priming lift,
as some gas always remains in the liquid end with gaseous
media.
1.
Fill the liquid end,
‘Filling the liquid end’ on page 39.
2.
Check the pump connectors and connections for leak-tight‐
ness.
3.
Check the suction valve and discharge valve for leak-tight‐
ness and tighten if necessary
4.
Check the liquid end for leak-tightness and tighten the
screws on the dosing head if necessary - see below for tight‐
ening torque.
5.
Only with degassing: Check whether the vent valve is closed.
6.
Start up the relief valve in the system in line with its operating
instructions.
7.
Start up the system.
8.
After 24 hours of operation: Tighten the screws on the dosing
head - see below for the tightening torque.
Data
Value Unit
Tightening torque for screws:
4.5 ... 5.0 Nm
1.
Turn the pump so that the pressure connector is facing
downwards.
2.
Allow water to flow out of the liquid end.
3.
Flush the suction connector from above with a suitable
medium or blast with compressed air.
1.
Connect the suction line to the liquid end but not yet the pres‐
sure line.
2.
If available: close the shut-off valve on the discharge side.
3.
Connect a short, transparent section of hose to the discharge
valve.
4.
Switch on the metering pump and allow it to work at max‐
imum stroke length and stroke rate until some feed chemical
becomes visible in the short section of hose.
ð
The liquid end has been filled completely without bub‐
bles.
5.
Switch off the metering pump.
6.
Connect the pressure line to the liquid end.
ð
The metering pump is ready for operation.
Starting up the metering pump
Tightening torque
Draining the liquid end
With feed chemicals that should not
come into contact with water:
Filling the liquid end
With liquid ends without degassing:
Start up
39
