Which mechanism causes erratic control valve behavior when liquid entering flashes to vapor?

💡 Explanation

When a liquid flashes to vapor due to a pressure drop below its vapor pressure, it creates a two-phase mixture accelerating within the valve, leading to choked flow as the vapor restricts the liquid's passage leading to erratic control. Therefore choked flow results, rather than seal swelling, or actuator fatigue, which require distinct material or structural weaknesses under external compression.

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