在介绍了温控阀原理的基础上，分析了感温包、隔膜和弹簧等关键元件，说明了它们的选择原则以及弹簧组的作用。
The key elements are discussed on the basis of theory of thermostatic valve, such as inductive temperature wrap, dissepiment and spring, the function of spring is explained.
介绍了热力膨胀阀应用于空调制冷系统的几个问题：过热调整不当、感温包常见故障、容量匹配及膨胀阀冻结故障等。
Some problems as incorrect adjustment on the degree of superheat, general failure of the thermometer bulb, matching of the capacity and freezing of the TEV are presented.
随着温度升高，感温元件（阀芯）内的顶杆，向A口移动。
With rising of temperature, top material in the temperature-sensing working move to port A.
随着温度升高，感温元件（阀芯）内的顶杆，向A口移动。
With rising of temperature, top material in the temperature-sensing working move to port A.
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