This is your starting place to determine which valve or injector is best suited for your application. Follow the steps to arrive at the product number.
Step 1: Select an application area
Step 2: Select one
As their name implies, two position valves operate in only two positions: Load and Inject, or Position A and Position B, etc.
Selectors step incrementally through continuous revolutions, with a variety of flow configuration choices from simple stream selection to trapping. Most are also available with the built in purge feature.
Step 3: Select a two position valve type
The industry standard for nearly 50 years. Medium and high temp models are available with 4, 6, 8, or 10 ports, with fittings for 1/32", 1/16", 1/8", or 1/4" tubing. Internal sample versions inject samples too small to do with a loop injector - as small as .06 µl. Most are also available with the built in purge feature.
The mini diaphragm valve has been designed for trouble-free use in the process industry, automated lab analyzers, or continuous-monitoring environmental analyses. Diaphragm valves are available in three configurations - 6 port, 10 port, and 4 port internal sample, with 1/32" or 1/16" fittings.
Step 3: Pick a selector flowpath
SD 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 selectors are similar to SDs. They select one of 4 to 16 streams, with the selected stream flowing from the valve outlet to a sample valve, pressure sensor, detector, column, etc. The non-selected streams flow to a common outlet, instead of being dead-ended as in the SD model.
SD and SC valves select and isolate one of 4 to 16 streams, with the remainder dead-ended in the SD and flowing to a common outlet in the SC. The SF selector is similar, but carries the evolution a step further with the non-selected streams flowing through individual outlets.
ST selectors are used for multi-column, multi-sample, or multi-trap operations, and are available for use with 4 to 16 loops, or positions. Valves can be ordered with matched loops already installed.
The STF selector is a variation of the ST flowpath, with the single difference that the non-selected streams are returned to their own vents or sources rather than being dead-ended or trapped as they are in the standard ST configuration.
Step 2: Select one
As their name implies, two position valves operate in only two positions: Load and Inject, or Position A and Position B, etc.
Multiposition valves step incrementally through continuous revolutions, selecting one stream and sending it to a common outlet.
Step 3: Select a Cheminert two position valve category
4 port microvolume sample injectors are used to achieve sample sizes of .2 µl to 2 µl. The internal sample "loop" is actually an engraved connecting slot on the rotor which is sized to contain a specified amount of sample. Availble with 1/16" Valco ZDV fittings or 1/4-28 fittings for 1/16" tubing. Rated 75°C at 250 psi liq.
This is the largest category, with 4, 6, 8, or 10 ports and a choice of 1/16" Valco ZDV fittings or 1/4-28 fittings for 1/16" or 1/8" tubing. Rated 75°C at 250 psi liq.
Step 3: Select a Cheminert selector category
This is the basic Cheminert stream selector, with a choice of 1/4-28 or Valco ZDV fittings and 4, 6, 8, or 10 positions.
This model is available only with 1/16" Valco ZDV fittings, and only on a microelectric actuator.
This model is also only available with a microelectric actuator, and offers a choice of 4 or 6 sample streams.
Cheminert Nanovolume® 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. In UHPLC models, a proprietary rotor material and stator coating achieve pressures to 20,000 psi, suitable for the most demanding analytical techniques.
Step 2: Select one
4 port microvolume sample injectors are used to achieve sample sizes as small as 4 nanoliters. The internal sample "loop" is actually an engraved connecting slot on the rotor which is sized to contain a specified amount of sample.
Available with 4, 6, 8, or 10 ports, 100 or 150 micron bore, 360 micron, 1/32", or 1/16" fittings.
Nanobore stream or column selectors are available for 4, 6, 8, or 10 streams, with pressure ratings to 20,000 psi.
Step 3: Select one
5000 psi, 1/32" Valco fittings, 100 or 150 micron bore
1/32" or 1/16" Valco ZDV fittings, 100 or 150 micron bore, pressure ratings of 10K, 15K, or 20K psi.
Step 3: Select one
5000 psi, 1/32" Valco fittings, 100 or 150 micron bore, 6 or 10 ports
Pressure ratings of 10K, 15K, or 20K psi, 100 or 150 micron bore, 360 micron, 1/32", or 1/16" Valco ZDV fittings.
Cheminert Nanovolume® UHPLC 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. A proprietary rotor material and stator coating achieve pressures to 20,000 psi, suitable for the most demanding analytical techniques.
Step 2: Select one
4 port microvolume sample injectors are used to achieve sample sizes as small as 4 nanoliters. The internal sample "loop" is actually an engraved connecting slot on the rotor which is sized to contain a specified amount of sample. We offer UHPLC internal sample injectors with 1/32" or 1/16" Valco fittings and 150 or 250 micron bore.
UHPLC sampling and switching valves are available with 4, 6, 8, or 10 ports, 100, 150, or 250 micron bore, and 360 micron, 1/32", or 1/16" fittings.
UHPLC stream or column selectors are available for 4, 6, 8, or 10 streams, with 1/16" or 1/32" fittings and 100, 150, or 250 micron bore.
Step 2: Select one
The Cheminert line ranges from nanovolume injectors with injection volumes as low as 4 nanoliters to standard 4, 6, 8, and 10 port injectors and valves. This very deep line also includes microbore valves, continuous flow injectors, and a through-the-handle injector, as well as injectors designed for use with autosamplers. Valves feature 1/32" and 1/16" fittings, with bore sizes from 0.10 mm (.004") to 0.75 mm (.030").
Models are available with 1/32", 1/16", or 1/8" fittings and 4, 6, 8, or 10 ports. Bore sizes range from 0.25 mm (.010") to 1.7 mm (.067"). Best suited for traditional HPLC applications with 100 bar columns.
Multiposition valves step incrementally through continuous revolutions, with a choice of dead-end stream selector or trapping flowpath. The trapping flowpath is also a good choice for column selection.
Step 3: Select one
With a uniform 100 °l flowpath and port-to-port volume of less than 25 nl, the Cheminert nanovolume 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. Available in 6 and 10 port versions, as well as 4 port internal sample injectors for injection of samples as small as 4 nanoliters. Rated at 5000 psi.
4 port microvolume sample injectors are used to achieve sample sizes of 4 nanoliters to .06 µl to 2 µl. The internal sample "loop" is actually an engraved connecting slot on the rotor which is sized to contain a specified amount of sample.
This category includes a through-the-handle injector, continuous flow injectors, a unique injector with a syringe injection port centered on the rear face of the valve (opposite the handle or actuator), and a model designed specifically for use in an autosampler, which permits the valve and actuator to be installed horizontally while the syringe loads the injector vertically. A sample loop is included with each injector. Available with Nitronic 60 stainless stators and PAEK stators.
This is the largest category, with 4, 6, 8, or 10 ports and a variety of fitting sizes and port diameters. Unless you need the specific application described above, select one of these.
Step 3: Select one
4 port microvolume sample injectors are used to achieve sample sizes of .06 µl to 2 µl. The internal sample "loop" is actually an engraved connecting slot on the rotor which is sized to contain a specified amount of sample. Injectors have 1/16" fittings with 1/16" fittings with a choice of .40 mm (0.25 mm column port diameter) or 0.75 mm ports. Rated 75°C at 5000 psi liq.
This is the largest category, with 4, 6, 8, or 10 ports and a variety of fitting sizes and port diameters for analytical, semi-prep, or preparative HPLC. Rated 75°C at 5000 psi liq. Unless you need the specific application described above, select one of these.
Step 3: Select one
The Cheminert Model C5 with 1/16" Valco ZDV fitting details is available with 4, 6, 8, or 10 positions. Stators are available in Nitronic 60 stainless, titanium, Hastelloy C, or PAEK.
Valco SD valves select one of 4 to 12 dead-ended streams. The selected stream flows from the valve outlet to a sample valve, pressure sensor, detector, column, etc. Available with 1/16" or 1/8" Valco ZDV fittings.
Valco ST valves are used for multi-column, multi-sample, or multi-trap operations. Available with 1/16" ZDV fittings, for 4 or 6 columns or loops.
Step 2: Select one
As their name implies, two position valves operate in only two positions: Load and Inject, or Position A and Position B, etc.
Selectors step incrementally through continuous revolutions, with a variety of flow configuration choices from simple stream selection to trapping.
Step 3: Select one
4 port microvolume sample injectors are used to achieve sample sizes of .06 µl to 2 µl. The internal sample "loop" is actually an engraved connecting slot on the rotor which is sized to contain a specified amount of sample. Injectors have 1/16" fittings with 1/16" fittings with a choice of .40 mm (0.25 mm column port diameter) or 0.75 mm ports. Rated 75°C at 5000 psi liq.
This is the largest category, with 4, 6, 8, or 10 ports and a variety of fitting sizes and port diameters for analytical, semi-prep, or preparative HPLC. Rated 75°C at 5000 psi liq. Unless you need the specific application described above, select one of these.
Step 3: Pick a selector flowpath
Valco SD valves select one of 4 to 12 dead-ended streams. The selected stream flows from the valve outlet to a sample valve, pressure sensor, detector, column, etc. Available with 1/16" or 1/8" Valco ZDV fittings.
Valco ST valves are used for multi-column, multi-sample, or multi-trap operations. Available with 1/16" ZDV fittings, for 4 or 6 columns or loops.
