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一般描述

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.
The figure illustrates the use of sequence reversal to monitor CO₂, CH₄, and CO in air. The sample is injected onto Column 1 and held 40 seconds to allow the composite peak of air, CO, and CH₄to pass onto Column 2. The valve is switched back to position A and the column sequence is reversed to allow CO₂to pass to the detector, followed by O₂, N₂, CH₄, and CO.

法律信息

Valco is a registered trademark of Valco Instruments Co. Inc.

基本信息

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