Basic HTML Version
valve selection
94
|
VICI AG International Sales: + 41–41–925–6200 Fax: + 41–41–925–6201
|
www.vici.com
Valco Injectors and Valves for GC
pages 96–99, 102–111
For nearly 40 years Valco valves have been the industry standard in gas chromato
graphy. Models are available with 3, 4, 6, 8, 10, 12, or 14 ports, with 1/32", 1/16",
1/8", or 1/4" fittings, and with bore sizes from 0.25 mm (.010") to 4 mm (.156").
In addition, Valco valves offer the widest range of rotor and body materials of any
valve available, with alloys and polymer composites capable of meeting virtually
any system requirement. All models can be ordered in manual, pneumatic, or
electrically actuated versions.
Valco Injectors and Valves for HPLC
pages 96–99, 112–116
A pioneer and industry leader in products for HPLC, Valco continues to offer the
market’s most diverse line in terms of number of ports, fitting sizes, materials of
construction, and actuation. 3, 4, 6, 8, 10, 12 port versions are offered, with 1/32",
1/16", or 1/8" fittings. As with the GC line, Valco valves offer the widest range
of rotor and body materials of any valves available, with alloys and polymer
composites capable of meeting virtually any system requirement. All models
can be ordered in manual, pneumatic, or electrically actuated versions.
Valco Selectors
pages 100–101, 122–133
One inherent benefit of the Valco conical rotary design is that it allows multiple
planes of ports, facilitating a variety of unique multiposition configurations
useful for stream selection, column selection, or trapping. Versions are available
for GC and HPLC applications, with 1/16", 1/8", or 1/4" fittings, with bore sizes
from 0.40 to 4.0 mm (.016" to .156"). Selectors are available for up to 16 streams
(34 ports), all with Valco’s trademark flexibility in terms of actuation and material
options.
DiaphragmValves for GC
pages 140–143
A diaphragm valve consists of plungers and ports arranged in a circular
pattern, with the plungers controlled by the reciprocating action of two air
actuated pistons. Extremely long lifetime (typically 1,000,000 cycles at ambient
temperature; approximately 500,000 cycles at elevated temperatures), very short
actuation time (10 milliseconds), minimum internal dead volume, and reliability
have made this type of valve very successful in process gas chromatography for
both sample injection and column switching. Our miniature version features
1/16" or 1/32" zero dead volume fittings, and is the first to offer a 10 port
configuration in addition to the 6 port and internal sample 4 port models.
Valve Selection
Following is an overview of the many types of valves available from VICI.
CHROMalytic TECHnology Pty Ltd AUSTRALIAN Distributors e-mail: sales@chromtech.net.au Tel: 03 9762 2034