cheminert valves
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Injector and Switching Valve Applications
Detector Selection fromTwo
Columns or One Column and
Auxiliary Carrier
This unique configuration allows analyses
of different parts of one analysis
with two different detectors, without
splitting or multiple injections.
Microvolume Sample Injection
The internal sample (fixed volume)
flowpath is used when very small sample
volumes are required. The sample size is
determined by a passage engraved on the
valve rotor, allowing precise, repeatable
injections. In Position A, the sample
flows through the sample passage while
the mobile phase flows through to the
column. The third passage is inactive. In
Position B, the sample passage is in line
with the column and the mobile phase
injects the contents of the sample passage
into the column.The passage which was
inactive in Position A allows the sample to
continue flowing without interruption.
4 port switching valve
4 port internal sample injector
These illustrations show basic sample injection techniques
using Valco two position valves. With rare exceptions, there
is no difference between switching valves and external
volume sampling valves, so the same valve can be used for
either function.
The unique advantage of 8 and 10 port valves is that they
reduce extra column volume by combining sampling
and switching functions in a single valve. This minimizes
expense, maintenance, service, and risk of leaks as
compared to multiple 6 port valve systems.
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CHROMalytic TECHnology Pty Ltd AUSTRALIAN Distributors e-mail:
Tel: 03 9762 2034
