Agilent Technologies 1290 Infinity LC System System Manual And Quick Reference page 27

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The Agilent 1290 Infinity LC System - Product Description
System Components
chromatographic performance these features makes the pump very quiet in
operation.
When concentrated buffer solutions are used as mobile phase, the active seal
wash option is available for use to extend the life of the pump seals.
A solvent selection valve allows binary mixtures (isocratic or gradient) to be
formed from one of two solvents per channel. Binary gradients are created at
the purge valve by high-pressure mixing of solvents from pump A and pump B.
The purge valve allows the flow to be switched under software control to
waste for purging new solvents through the pump head. A sensor is connected
to the purge valve to monitor the system pressure.
Figure 13 The Jet Weaver mixer
Agilent 1290 Infinity LC System Manual and Quick Reference 27