As an electric controlled element, electronic expansion valves have many advantages which traditional heat expansion valves don't have, such as high precision, and fast and correct action.
作为电控元件，电子膨胀阀具有传统的热力膨胀阀所不具备的精度高，动作快速且准确的优点。
Shell and tube heat exchanger, screw compressor, and electronic expansion valves are detailed selectioned and designed, and a sewage-source heat pump system is designed for a building of Harbin.
对壳管式换热器、螺杆压缩机、电子膨胀阀进行详细的选型和设计计算，对哈尔滨市某办公楼设计出一套污水源热泵系统。
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