valco valves
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Valco Instruments Co. Inc. Sales:
800–367–8424
Fax: 713–688–8106
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137
4
3
2
1
6
5
TO COLUMN
CARRIER
IN-LINE
FILTER
6 port
valve
VENT
4 position
ST valve
PROCESS STREAM
LOOP 1
LOOP 3
LOOP 2
LOOP 4
4
3
2
1
6
5
TO COLUMN
CARRIER
IN-LINE
FILTER
VENT
PROCESS STREAM
LOOP 1
LOOP 3
LOOP 2
LOOP 4
more information
ST prices
Low pressure . 128-129
High pressure . . . 133
Application
High pressure ST . .139
tech tip
Because the most
common cause of valve
failure is stray particulates
entering the valve, we
strongly recommend the
use of in-line filters at
sample entry points.
Our ZUFR filters feature
inexpensive and easily
replaceable low pressure
drop filter screens (2 or
10 micron). The filters
are available in 1/16",
1/8", and 1/4" standard,
reducing, and bulkhead
versions.
Filters . . . . . . page 52
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sample trapping applications
for 4 to 16 streams
ST selectors are used for multi-
column, multi-sample, or multi-trap
operations. The ST configuration is
available in both MW and UW type
designs.
A typical application, shown here,
is the collection of fractions at
timed intervals for analysis at a later
time. Valves can be ordered with
matched loops already installed.
In this example, the 6 port valve
shown is used to select between
collection/trapping and
analysis/desorption. Both valves
can be supplied with pneumatic or
electric actuators to automate these
functions.
ST flowpath — low pressure
Selector Applications
CHROMalytic TECHnology Pty Ltd AUSTRALIAN Distributors e-mail:
Tel: 03 9762 2034
