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Repairing the Pump
Exchanging the Active Inlet Valve Cartridge or the Active Inlet Valve
Figure 13 Active Inlet Valve Assembly
Replacing the Active Inlet Valve
1 Insert the new, or rebuilt valve into the pump head. Using the 14 mm wrench
turn the nut until hand tight.
2 Position the valve that the solvent inlet tube connection points towards the
front.
3 Using the 14 mm wrench tighten the nut by turning the valve in its final
position (not more than a quarter turn). Do not overtighten the valve. The
solvent inlet tube connection should point to the right corner of the pump
head.
4 Reconnect the solvent inlet tube to active inlet valve and the active inlet valve
cable to the connector in the Z-panel.
5 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.
Valve cartridge
Valve body