Exchange the Active Inlet Valve (AIV) or its Cartridge

Unplug the active inlet valve cable from the connector.

Disconnect the solvent inlet tube from the inlet valve (be aware that solvent may leak out of the tube due to hydrostatic flow).

Unscrew the adapter from the active inlet valve.

Using a 14 mm wrench loosen the active inlet valve and remove the valve from the pump head.

Using a pair of tweezers remove the valve cartridge from the actuator assembly.

Before inserting the new valve cartridge clean the area in the actuator assembly. Flush the cartridge area thoroughly with alcohol.

Insert a new cartridge into the actuator assembly (make sure the valve cartridge is completely inserted into the actuator assembly).

Insert the new valve into the pump head. Using the 14 mm wrench turn the nut until it is hand tight.

Position the valve such that the solvent inlet tube connection points towards the front.

Using the 14 mm wrench tighten the nut by turning the valve into its final position (not more than a quarter turn).

Reconnect the adapter at the active inlet valve.

Reconnect the solvent inlet tube to the adapter. Reconnect the active inlet valve cable to the connector in the Z-panel.

Purge the system with 30 mL of solvent in order to achieve a low pressure ripple.

Run the Leak Rate Test (see Leak Rate Test).