One of the most common control element in the process control industry is the control valve. A control valve helps regulate the flow of a fluid (gas, steam, water, or chemical substance) in order to keep the regulated process variables (pressure and flowrate) as close as possible to the desirable se

I suppose that pressure control valve that had the same upstream and downstream conditions regardless of flow

Trim design of the valve affects how the control valve capacity changes as the valve moves through its complete travel. Because of the variation in trim design, many valves are not linear in nature.

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