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Pressure Swing Adsorption (PSA) inlet valves feed hydrogen and light hydrocarbon gas into the PSA unit. These valves are either wide open or fully closed, so throttling control is not important, but it is essential that the valves open and close reliably when required to do so. In the PSA unit, the hydrogen is purified to >99.9% and is measured by an H2 analyzer at the plant outlet. PSA is a high cycle process requiring valves to cysle every few minutes. Not only are the valves required to cycle completely open and closed, but upon closing, they must require zero leakage across the valves for tight shut off.
