1200 Series Quarternary Pump User Manual 101
Maintenance
7
Simple Repairs
Exchanging the Multi-Channel Gradient Valve (MCGV)
Tools required • Pozidriv #1
Parts required # Part number Description
1 G1311-69701 MCGV (exchange assembly)
Preparations • Switch the quaternary pump off at the power switch.
• Remove the front cover to have access to the pump mechanics.
The lifetime of the multi-channel gradient valve can be maintained by regularly flushing the
valve, especially when using buffer solutions. If using buffer solutions, flush all channels of
the valve with water to prevent precipitation of the buffer. Salt crystals can be forced into
an unused channel and form plugs that may lead to leaks of that channel. Such leaks will
interfere with the general performance of the valve When using buffer solutions and
organic solvents in the Agilent 1200 Series Quaternary Pump it is recommended to connect
the buffer solution to one of the bottom ports and the organic solvent to one of the upper
gradient valve ports. It is best to have the organic channel directly above the salt solution
channel (e.g., A - salt solution, B - organic solvent).
1
Disconnect the connecting tube, waste tubeand the
solvent tubes from the MCGV, unclip them from the tube
clipsand place them into the solvent cabinet to avoid flow
by hydrostaticpressure.
2 Press the lower sides of the cover to unclip it. Remove the
cover.
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