154 Agilent 1290 Infinity Binary Pump User Manual
9 Maintenance
Replacing the Purge Valve Head
Replacing the Purge Valve Head
When In case of problems with the purge valve
Parts required # p/n Description
1 5067-4119 Purge valve head
1 5067-4655 Capillaries to pump head assemblies channel A and B (2x)
1 G4220-87000 Capillary SST Valve to Jet Weaver 300 mm x 0.17 mm I.D.
1 5067-4656 Capillaries to pressure sensor (2x)
Preparations Remove all capillary connections to the purge valve
Potential damage of valve head or malfunction of valve
When the pump is switched on, the valve tag is accessed (read/write) and used for
correctly positioning the valve.
If the valve head is replaced while the pump is on, invalid information may be written to
the valve head making it unusable, or positioning may be wrong resulting in wrong flow
connections inside the valve potentially damaging parts.
➔ Switch off the pump before working on the purge valve.
Bias measurement results
The valve drive contains sensitive optical parts. Pollution of these parts can impair the
accurate selection of valve ports and therefore bias measurement results.
➔ Protect the optical parts from dust and other pollutions.
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