Like the injection valve, the auxiliary valve is a 2-position, electrically-activated Rheodyne valve. This high-pressure PEEK valve is offered in two models: 6-port (with a port diameter of at least 0.009 in) and 10-port (with 0.010-in diameter ports).

Figure 6-port and 10-port high-pressure valve flow schematics
6-port and 10-port high-pressure valve flow schematics

NOTE

The Dionex Inuvion IC System can accommodate either an auxiliary valve or a regenerant pump, but not both.

The auxiliary valve enables a variety of sample preparation activities. Connections from chromatography components to the valve ports depend on the application. These include:

  • Inline filtration
  • Matrix elimination (for example, the removal of high backgrounds of chloride or organic material)
  • Concentrator-based techniques
  • Conditional injections (large loop or small loop applications where the data system monitors sample concentration and reinjects the sample, using the smaller loop, if the concentration is too high)
  • Matrix diversion prior to MS (mass spectrometry) detection

The auxiliary valve can be installed on-site by a Thermo Fisher Scientific service engineer or by users.