During full load conditions, how long should the solenoid valve remain open while feeding makeup liquid to another vessel?

The correct response, which indicates that the solenoid valve should remain open for 80% or greater of the time during full load conditions, aligns with operational practices in many processing systems. Having the solenoid valve open for this duration ensures that the makeup liquid is supplied adequately to maintain system balance and pressure, preventing any potentially damaging consequences of low liquid levels.

Operating with high valve open time allows for the seamless integration of makeup liquid, supporting consistent process parameters and minimizing disruptions. It helps maintain a steady flow and pressure, which is critical in full load scenarios where demand is high and the system must respond rapidly to changes.

In contrast, a shorter duration for the valve being open may lead to insufficient liquid supply during a critical period, risking system performance or leading to process instability. This is why options implying a significantly reduced operation time are less suitable for full load conditions.