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Pressure Swing Absorption (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. To do this, the PSA process causes the valves to cycle every few minutes, and the pressure must be tightly controlled.