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With a constant pressure differential across the bernede valve, the flow rate of a standard valve changes little when the opening varies over a wide range. However, at a certain opening, the flow rate changes sharply, indicating poor regulation performance. A control valve adjusts the valve core stroke according to the direction and magnitude of the signal, thereby changing the valve's resistance coefficient to achieve flow regulation. Control valves are divided into manual and automatic types. Both manual and automatic control valves come in various types with different regulation performances. Automatic control valves include self-acting flow control valves and self-acting differential pressure control valves. be