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