Exchanging The Dual-Channel Gradient Valve (Dcgv) - Agilent Technologies 1220 Infinity II LC User Manual

11
Maintenance and Repair
Solvent Delivery System

Exchanging the Dual-Channel Gradient Valve (DCGV)

Tools required p/n
8710-0899
Parts required #
1
Preparations Switch off the pump at the power switch.
Remove the upper front cover to gain access to the pump mechanics.
The lifetime of the dual-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 1220 Infinity II LC Pump, it is recommended to connect the
buffer solution to the lower port of the gradient valve and the organic solvent to the upper
port. It is best to have the organic channel directly above the salt solution channel (A: salt
solution, B: organic solvent).
1
Disconnect the solvent tubes from the DCGV.
264
Description
Screwdriver, Pozidriv #1
p/n Description
G4280-60004 Dual-channel gradient valve
2
Disconnect the connecting tube, waste tube and the
solvent tubes from the DCGV, unclip them from the tube
clips and place them into the solvent cabinet to avoid
flow by hydrostatic pressure.
1220 Infinity II LC System User Manual