About injectors and valves
We offer valves for so many applications and in so many sizes, materials,
and specialized port configurations that the choices may at first seem daunting.
Our technical support staff is always glad to discuss your
specific needs and recommend the best injector or valve for your application.
Here online, we can also walk you through a step-by step process to arrive at
the valve you need or provide you with a printable flowchart.
Which valve do I need?
• Interactive web-based selector
• Letter-sized PDF flowchart
• Tabloid PDF flowchart
An overview
Following are brief introductions to Valco, Cheminert, and Diaphragm
injectors and valves, to familiarize you with the product lines and their
capabilities.
See charts comparing all valves for:
Valco injectors and valves for GC
For over 30 years Valco valves have been the industry standard in gas
chromatography. 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.
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More about Valco valves
Valco injectors and valves for HPLC
A pioneer and industry leader in products for HPLC, Valco continues
to offer the market’s most diverse line in terms of options for 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.
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More about Valco valves
Valco multiposition valves
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").
Multiposition valves are available for up to 16 streams (34 ports), with
all of Valco’s trademark flexibility in terms of actuation and material
options.
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More about Valco valves
Diaphragm valves for GC
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.
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Cheminert nanovolume™ injectors and valves for HPLC
With a uniform 100 micron flowpath and port-to-port volume of less than
25 nl, Cheminert nanobore injectors and switching valves are ideal
for high speed, high throughput techniques which demand a valve and fitting
system that minimize internal volume and eliminate dead volume.
Our 10,000, 15,000, and 20,000 psi
injectors achieve maximum pressure and lifetime by employing proprietary rotor
materials and stator coatings.
Specially designed fittings accommodate fused silica capillary, 1/32”
PEEK, or Valco electroformed nickel tubing.
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More about Cheminert valves
Cheminert injectors and valves for HPLC/UHPLC
The standard line of Cheminert flat plate valves for HPLC includes
4, 6, 8, and 10 port versions plus a through-the-handle front-loading
injector and a rear-loading injector with a stationary centered injection
port designed for use with autosamplers. Also available is a submicroliter
injector with injection volume down to 4 nanoliters. Valves feature 1/32" or 1/16"
zero dead volume fittings with bore sizes from 0.10 mm (.004") to 0.75 mm
(.030"). Most models are available in manual, air, or electrically actuated
versions.
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More about Cheminert valves
Cheminert injectors and valves for low pressure applications
Cheminert’s flat plate two position design offers 4, 6, 8, or 10 port
configurations. The design features a choice of Valco 1/16" zero dead volume
fittings or 1/4-28 Cheminert internal fittings for 1/16" or 1/8" OD tubing.
New to the line is the Model C42, with 1/2-20 fittings and .180" ports.
All models are available in manual, air, or electrically actuated versions.
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More about Cheminert valves
Cheminert multiposition valves
The rotary flat plate design allows 4, 6, 8, 10, 14, 20, 24, or 26 position
stream selection valves, in high pressure and low pressure models. A variety
of configurations are available with bore sizes from 0.25 mm (.010") for HPLC
column selectors up to 4.6 mm (.180") for applications requiring minimal
restriction across the valve. Metal or all-polymeric valves can be ordered,
with models available in manual, pneumatic, or electrically actuated
versions.
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More about Cheminert valves
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