为研究恒流量控制阀的流量恒定机理，依据某型号阀的实际结构对影响恒流量控制阀特性的阀口过流面积及梯度因素进行分析。首先，建立其数学模型、控制理论模型和动态系统传函框图，定性分析了这些因素对恒流量控制阀特性的影响；然后，建立其AMESim仿真模型，分析了这些因素对该阀稳态特性和动态特性的影响机理，并通过实验验证了仿真模型的可靠性。结果表明：恒流量控制阀结构存在级间负反馈，补偿节流孔两侧压差可降低流量调节偏差；调节压力补偿器阀口过流面积有助于改善恒流量控制阀的稳态特性；调整压力补偿器阀口过流面积梯度可显著改善恒流量控制阀的静、动态特性。

To study the constant flow mechanism of the constant flow control valve， the influence of flow area and gradient on the characteristics of constant flow control valve are analyzed based on the actual structure of a certain type of valve. Firstly， the mathematical model， the control theoretical model and the transfer function block diagram of the dynamic system are established to quantitatively analyze the influence of these factors. Then the AMESim simulation model is established， and the influence mechanism of these factors on the steady-state and dynamic characteristics of the valve is analyzed. The reliability of the simulation model is verified by the experiment. The results show that there exists negative feedback between stages in the constant flow control valve， which compensates the pressure difference between the two sides of throttle and reduces the flow adjustment deviation. Adjusting the flow area of the pressure compensator can improve the steady-state characteristics of the constant flow control valve. Adjusting the flow area gradient of the pressure compensator can significantly improve the static and dynamic characteristics of the constant flow control valve.