Metrohm 930 Compact IC Flex Oven/SeS/PP - Manual (Page 76)

5.7 Servicing the high-pressure pump
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930 Compact IC Flex Oven/SeS/PP (2.930.2500)
Spare parts If the inlet valve cannot be cleaned, you will need a new inlet valve
(6.2824.170) for this step.
Cleaning the inlet valve
1 Removing the inlet valve
￭ Start by loosening the inlet valve holder with the adjustable
wrench (1) and then unscrew it by hand (2) and remove it.
￭ Remove the inlet valve from the inlet valve holder (3).
2 Cleaning the inlet valve
￭ Start by rinsing the inlet valve in the direction of eluent flow using
a wash bottle filled with ultrapure water, RBS™ solution or ace-
tone. (The direction of eluent flow is marked on the valve by an
arrow.)
The rinsing solution must come out at the valve outlet.
If no more solution comes out, then the valve is blocked.
￭ Rinse the inlet valve in the direction opposite the eluent flow
using a wash bottle filled with ultrapure water, RBS™ solution or
acetone.
The rinsing solution should only come out at the valve outlet.
￭ The rinsing effect is further increased through a short treatment in
an ultrasonic bath.