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原文
Variable flow control valve is not suitable for operating mode causes Self-operated flow control valve can only be applied to a constant flow of quality control system is not suitable for variable flow operation mode of the reasons: 1, will produce dynamic hydraulic imbalance. When the system to heat the active variable flow control, or who by other means of reducing the system's flow, the pipe network will reduce the pressure, the pressure of the heating network as smaller, local users to self-operated flow control valve automatic valve core will open big, to maintain the original constant flow. As the flow control valve of this special structure, making the pipe flow changes the characteristics of resistance change in the number of S values??, the overall characteristics of the resistance network will change the number, the total flow in the pipe in the distribution ratio changes accordingly. Local users and remote users can not change the total flow with the geometric changes. Flow rate change is just change the remote user traffic. This will inevitably result in a dynamic hydraulic imbalance heating network, remote users fail to use the heat requirements. 2, when the user required to adjust the room temperature independent, self-operated flow control valve, the valve after the users need to increase the flow rate, flow control valve as self-limited, increased flow does not go up; when users need to reduce the flow valve, the user mutual interference between the will, self-operated flow control valve can become useless power consumption of the pump valves. 3, the need to increase the circulating water flow rate increases do not go. Circulating pump to reduce the outdoor climate, the need to increase recycling of water, the user traffic flow control valve as self-control, allowing users to increase the flow does not go up. So, regardless of the initiative is based on user-variable flow of heat to the heat source for the active network or variable flow heating network can not be applied self-operated flow control valve. Self-operated flow control valve is only applicable to constant flow of quality control system. Many heating companies have chosen frequency, multi-pump, a small pump, large pumps, small pumps to achieve variable flow operation, balanced selection of self-heating network water flow control valve is wrong. Self-installation of the heating network flow control valve can not use variable flow mode of operation.
原文来自：http://www.kongzhifa.org.cn

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译文：
自力式流量控制阀只能适用于定流量的质调节系统不适合变流量运行模式的原因： 1、会产生动态水力失调。当系统进行以热源为主动变流量调节时，或者谁通过其他手段减小系统的流量时，管网的压力会减小，热网由于压力的变小，近端用户自力式流量控制阀自动阀芯就会开大，维持原来的流量恒定。由于流量阀这种特殊的构造、流量变化使得管段的特性阻力数S值发生变化，网路的总特性阻力数也会随之改变，总流量在各管段中的分配比例也相应地发生变化。近端用户和远端用户不能随着总流量变化而等比变化。流量变化只是远端用户的流量变化。这就势必会造成热网的动态水力失调，远端用户达不到用热要求。 2、当用户按要求自主调节室内温度时，自力式流量控制阀、阀后用户需要增加流量时，由于自力式流量控制阀的限制，流量增不上去；当阀后用户需要减少流量时，用户之间就会相互干扰，自力式流量控制阀就成了只能消耗水泵功率的无用阀。 3、需要增加循环水量流量增不上去。循环水泵根据室外气候降低，需要增加循环水量时，用户流量由于自力式流量控制阀的控制，使用户的流量增不上去。所以，不管是以用户为主动变流量的热网还是以热源为主动变流量的热网都不能应用自力式流量控制阀。自力式流量控制阀只适用于定流量的质调节系统。目前许多供热企业选择变频、多泵、少泵、大泵、小泵实现变流量运行，热网水力平衡选用自力式流量控制阀是错误的。安装自力式流量控制阀的热网不能采用变流量运行模式。

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