Basic HTML Version
valco valves
134
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Stream selectionwith
dead-ended streams
SD valves select one of 4 to 16
dead-ended streams. The selected
stream flows from the valve outlet
to a sample valve, pressure sensor,
detector, column, etc. The same
configuration may also be used
to direct one stream to a number
of outlets for applications such as
fraction collection.
This example illustrates automated
sampling of non-pressurized
containers.
A vacuum pump is used to
move sample from the containers
to a 6 port sampling valve.
The
3 port valve is used to block the
vacuum flow through the sampling
valve to allow the sample within the
loop to equilibrate at atmospheric
pressure.
The 6 port valve is then
switched, injecting the sample. This
method eliminates any possible
effect from pressure differences
among the containers, providing
accurate and repeatable results.
All three valves can be automated
with air or electric actuators for
unattended operation.
The SD flowpath isolates the
unselected sample streams, but
the potential exists for extraneous
sample or contaminants to be in
the lines when containers are first
connected. To avoid problems,
either prepurge each line or allow
sufficient sampling time for the line
to purge prior to injection.
more information
SD prices
Low pressure . 122-123
High pressure . . . 132
Application
High pressure SD . . 139
SD flowpath — low pressure
Selector Applications
CHROMalytic TECHnology Pty Ltd AUSTRALIAN Distributors e-mail: sales@chromtech.net.au Tel: 03 9762 2034