Exchanging The Multi-Channel Gradient Valve (Mcgv) - Agilent Technologies 1200 Series Reference Manual

4 Repairing the Pump

Exchanging the Multi-Channel Gradient Valve (MCGV)

The lifetime of the multi-channel gradient valve can be maintained by regularly flushing the
N O T E
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).
Parts required
Tools required
Preparations for this
procedure
122
MCGV (exchange assembly, G1311-69701)
Pozidriv #1
Switch the quaternary pump off at the power switch.
Remove the front cover to have access to the pump mechanics.
1200 Series QP Reference Manual