82 1200 Series Quarternary Pump User Manual
7 Maintenance
Simple Repairs
3 Disconnect the solvent inlet tube at the inlet valve (be aware that solvent
may leak out of the tube due to hydrostatic flow).
4 Unscrew the adapter from the active inlet valve.
5 Using a 14 mm wrench loosen the active inlet valve and remove the valve
from pump head.
6 Using a pair of tweezers remove the valve cartridge from the actuator
assembly.
7 Before inserting the new valve cartridge clean the area in the actuator
assembly. Flush the cartridge area thoroughly with alcohol.
8 Insert a new valve cartridge into the actuator assembly (make sure the
valve cartridge is fully inserted into the actuator assembly).
9 Insert the valve into the pump head. Using the 14 mm wrench turn the nut
until it is hand tight.
10 Position the valve so that the solvent inlet tube connection points towards
the front.
11 Using the 14 mm wrench tighten the nut by turning the valve in its final
position (not more than a quarter turn).
12 Reconnect the adapter at the active inlet valve.
13 Reconnect the solvent inlet tube to the adapter. Reconnect the active inlet
valve cable to the connector in the Z-panel.
14 Reinstall the front cover.
After an exchange of the valve cartridge it may take several ml of pumping with the solvent
used in the current application, before the flow stabilizes at a %-ripple as low as it used to
be when the system was still working properly.
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