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valco valves
100
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VICI AG International Sales: + 41–41–925–6200 Fax: + 41–41–925–6201
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About Selectors
Instead of the back and forth switching of two position valves, selectors
(multiposition valves) step incrementally through continuous revolutions
(bi-directionally with the microelectric actuator). While we can supply older
models, all the valves in this catalog have a preload assembly. This design allows
the rotor to be inspected or replaced without taking the valve off the actuator,
and valves ordered with a microelectric actuator are permanently aligned.
Flowpath Configurations
SD (dead-ended)
valves select one
of 4 to 16 dead-ended streams,
directing it through the valve outlet
to a sample valve, pressure sensor,
detector, column, etc. The same
configuration can also direct one
stream to a number of outlets for
fraction collection.
SC (common outlet)
selectors are
similar to SDs, except that instead of
being dead-ended the non-selected
streams flow to a common outlet.
SF (flow-through)
selectors are similar
to SDs and SCs, selecting a stream and
sending it to the outlet. However, SFs
allow the non-selected streams to flow
through individual outlets instead of a
common outlet.
ST (trapping)
selectors are used for
multi-column, multi-sample, or multi-
trap operations.
STF (trapping/flow-through)
selectors are similar to STs, with the
single difference being that the non-
selected streams are returned to their
own vents or sources rather that being
dead-ended or trapped as they are in
the standard ST configuration.
port diameters—
(UW)
Fitting
No. of
Standard
size
Positions
port diameter
SD
1/16" 4 - 12
0.40 mm (.016")
1/8"
4, 6, 8
0.75 mm (.030")
ST
1/16" 4,6
0.40 mm (.016")
more information
Actuation
. pp 186-209
Applications
. 134-139
Materials
Metals . . . . 254-255
Polymers . . . . . . 256
Valve rotors . . . . 257
Specifying a special
body material . . . . 97
Selector prices
Low pressure
SD . . . . . . 122-123
SC . . . . . . 124-125
SF . . . . . . 126-127
ST . . . . . . 128-129
STF . . . . . . 130-131
High pressure
SD . . . . . . . . . 132
ST . . . . . . . . . 133
Loops, if required, are
found on corresponding
valve pages.
For special port diameters,
please consult the factory.
port diameters—
(mW)
Fitting
No. of
Standard
size
Positions
port diameter
SD
1/16" 4 - 16
0.75 mm (.030")
1/8"
4 - 16
1.0 mm (.040")
1/4"
4 - 10
4.0 mm (.156")
SC
1/16" 4 - 16
1.0 mm (.040")
1/8"
4 - 16
1.0 mm (.040")
1/4"
4 - 8
4.0 mm (.156")
SF
1/16" 4 - 16
1.0 mm (.040")
1/8"
4 - 16
1.0 mm (.040")
1/4"
4 - 8
4.0 mm (.156")
ST
1/16" 4 - 16
0.75 mm (.030")
1/8"
4 - 16
1.0 mm (.040")
STF
1/16" 4 - 16
0.75 mm (.030")
1/8"
4 - 16
1.0 mm (.040")
Low pressure
High pressure
CHROMalytic TECHnology Pty Ltd AUSTRALIAN Distributors e-mail: sales@chromtech.net.au Tel: 03 9762 2034