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An impulse flow regulator was a component of Starfleet impulse engines.
In the year 2311, the impulse flow regulators on the USS Enterprise-B gave the crew problems. (ST - The Lost Era novel: Serpents Among the Ruins)
In 2373, Benjamin Sisko had to realign the impulse flow regulators on a Danube-class runabout while the impulse engines were active. (DS9 episode: "Blaze of Glory")