Bleeding The Liquid End - ProMinent Hydro 2 Series Operating Instructions Manual

Only with a heating cartridge: check the
action of the heating cartridge
Only at low temperatures: allow the pump
to warm up
Earthing lines
Potential equalisation lines (mandatory
with ATEX)

8.1 Bleeding the liquid end

Fig. 15: Tapping the valve set disc
Check the heating action of the heating cartridge and the effectiveness of
the protective temperature limiter. No overheating must occur, especially
in the area at risk from explosion!
1. Switch on the heating cartridge, set the stroke length of the pump to
"0" and start the pump.
2. Allow the pump to warm up for 5 minutes.
3. Set the stroke length of the pump to the required value.
Check whether the earthing lines in the pump's electrical units are cor‐
rectly connected and connected to a clean earth wire - see earthing dia‐
grams in the appendix.
Check whether the potential equalisation lines are sitting correctly on the
pump and connected to a clean potential equalisation point.
When bleeding the liquid end or priming against pressure:
Depressurise the suction and discharge lines!
With dangerous or unknown feed chemicals, take suitable protective
measures according to the safety data sheet!
1. Loosen the discharge line.
2. Install a piece of translucent hose.
3. Run the pump slowly until the feed chemical appears in the section
of hose.
4. Remove the piece of hose.
5. Assemble the discharge line.
Eliminating suction problems (only for single ball valves
with PTFE ball seat)
For suction problems occurring during start up:
Exclude the possibility that there are foreign bodies
–
in the valve.
Place the valve on a stable surface.
–
Using a hammer (1) and a brass bar (2), gently tap
–
the PTFE ball seat above the valve ball - see figure
below.
Then with the valve in a damp condition allow it to
–
prime.
Start up and operation
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