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cheminert valves
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169
Injector and Switching Valve Applications
Loop Sampling
with Backflush to Detector
One valve performs the functions of
sampling and backflush valves, simplifying
operation and reducing cost. When
components of interest are detected,
the strongly retained components are
backflushed and removed from the column
without temperature programming.
More applications................................... page 119
Alternate Column Regeneration
When columns must be regenerated
following each analysis, this technique
permits automation of the process. While
one column performs the analysis, the
second column undergoes regeneration
through use of an auxiliary pump.
Once the first analysis is complete, the
valve is switched and the regenerated
column is ready for analytical use.
More applications.........................pages 120-121
Sample Injection
With the valve in Position A, sample flows
through the external loop while the mobile
phase flows directly through to the column.
When the valve is switched to Position B,
the sample contained in the sample loop
and valve flow passage is displaced by the
mobile phase and is carried into the column.
Note:
Especially for partial-filled loops, the
flow direction of the mobile phase through
the loop should be opposite (backflush) to
the flow direction during the loading of the
loop.
More applications.........................pages 118-119
10 port sampling/switching
8 port sampling/switching
6 port external sample injector
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