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    Why is a gap controller often used in controlling a level in a high pressure vessel?

    Question: Why is a gap controller often used in controlling a level in a high pressure vessel?

     Answer:

    Gap controllers output changes from minimum to maximum and visa versa when the process measurement deviates the setpoint by the set gap. Hence the final control element i.e. control valve acts like an on-off valve. This helps in minimizing the trim erosion due to a high DP across the control valve while partially open.

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