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High pressure rotary valves up to 350 bar - HPLC, GC

Injection and selection rotary valves play a crucial role in the operation of High-Performance Liquid Chromatography (HPLC) systems, facilitating the precise and automated introduction of samples into the chromatographic column. These valves are integral components in the sample injection process, ensuring accuracy, reproducibility, and efficiency in HPLC analyses.

Injection Rotary Valves

Injection rotary valves are responsible for the controlled introduction of liquid samples into the chromatographic system. These valves are typically positioned between the sample loop and the chromatographic column. The sample loop is a key element in the injection process, temporarily storing the sample before it is introduced into the mobile phase flow.

The injection rotary valve operates by rotating to align the sample loop with the mobile phase flow path. When the valve is in the injection position, the sample is introduced into the mobile phase, initiating the chromatographic separation process. Precise control over the injection volume is crucial for obtaining accurate and reproducible results in HPLC analyses. 

Selection Rotary Valves

Selection rotary valves are employed in multi-column HPLC systems where multiple columns are connected in parallel or series. These valves play a pivotal role in directing the flow of the mobile phase and determining which column or combination of columns the eluent will pass through. By rotating to different positions, selection valves allow for the seamless switching between columns, enabling versatility in chromatographic applications.

The ability to select columns in real-time is particularly valuable in complex analytical scenarios. For instance, in multidimensional chromatography, selection rotary valves enable the comprehensive separation of complex mixtures by using different stationary phases in various dimensions.