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Injection Valves
Injection valves are a key element in chromatography and play a crucial role in the precise introduction of samples into the chromatographic system. These valves are designed to allow accurate and controlled injection of samples, which is of paramount importance for the reproducibility and accuracy of analytical results.
There are different types of injection valves, each offering specific advantages. The most common types are manual injection valves and automatic injection valves.
Manual injection valves are operated by hand and require precise handling to accurately introduce the samples into the system. These valves are easy to operate and offer flexibility when injecting different sample volumes. They are ideal for smaller laboratories and applications where high throughput rates are not required.
Automatic injection valves are integrated into automated systems and enable highly accurate and repeatable sample injection. These valves are particularly beneficial in high-throughput laboratories as they increase efficiency and minimise human error. Automatic injection valves can be programmed to inject a large number of samples in a single run, significantly reducing analysis time.
Choosing the right injection valve depends on several factors, including the type of chromatography (e.g. gas chromatography or liquid chromatography), the desired precision and the throughput requirements of the laboratory. High-quality injection valves are characterised by their durability and chemical resistance, which is crucial for handling different solvents and samples.
Another important aspect of injection valves is the avoidance of cross-contamination. This is achieved through the design of the valve and the materials used, which ensure that no residues from previous samples affect the current analyses. High quality valves have precise seals and minimal dead volume to ensure complete and clean sample transfer.
Injection valves require regular maintenance and cleaning to maintain optimal performance. Regular inspection and replacement of wearing parts, such as seals and gaskets, contribute to the longevity and reliability of the valves.
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