Metrohm 881 Compact IC pro – Anion - Manual (Page 84)

5.5 High pressure pump
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74 ￭￭￭￭￭￭￭￭
881 Compact IC pro – Anion
￭ Place over the valve housing and hold it tightly.
￭ By tilting the tool, the valve components slide into the valve hous-
ing.
￭ Press the seal by hand well on the valve housing.
6 Checking the flow direction
Rinse the valve in the direction of the arrow on the valve housing and
check wether liquid is escaping on the other end.
If this is not the case, the valve has to be dismantled again and be
reassembled correctly (see Figure 36, page 73).
7 Inserting the valves back into the pump head
Caution
If by mistake, the inlet valve is mounted instead of the outlet valve,
an extreme pressure builds up within the working cylinder, which
can destroy the piston seal!
When inserting the valves, please take into account that the liquid
is being pumped through the pump head from bottom to top.
￭ Insert the inlet valve into the inlet valve holder the way the seal is
visible.
￭ Screw the inlet valve holder into the bottom of the pump head
and tighten with a wrench (34-4).
￭ Insert the outlet valve into the outlet valve holder the way the seal
is visible.
￭ Screw the outlet valve holder into the top of the pump head and
tighten with a wrench (34-1).