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eCl@ss 32060101
Properties:
| Related Categories | 4-Port Sampling and Switching Valve, Analytical/Chromatography, GC Accessories, Gas Chromatography (GC), Instrument Upgrades and Maintenance, |
| feature | number of ports 4 |
| mfr. no. | VICI Valco® |
| maximum temperature | 175 °C |
| fitting size | 1/8 in. |
Description:
General description
Isolate a column to prevent a compound, emerging from an upstream column, from being irreversibly adsorbed. In the figure, CO2 is separated from air in Column 1, and bypasses Column 2 when the valve is switched to position B. After the CO2 is detected, the valve is switched back to position A and O2, N2, CH4, and CO elute from Column 2 to the detector.
Sampling valve basically supports the discrete volumes of the treated samples stream to periodically inject into the carrier gas stream of the chromatograph. Sampling valves are fitted with electric or pneumatic actuators which help them to be operated automatically. Switching valve are critical if binary pumps are used. It allows employment of different desired mobile phases. Switching valve consists of five parts: control unit, connecting device, valve body, a rotor and preloaded assembly.
Application
Sampling valve may be used to connect the LC and GC instruments to allow fast and dependable introduction of large sample volumes onto a capillary GC column.
Legal Information
Valco is a registered trademark of Valco Instruments Co. Inc.
