两种常见形式是固定节流阀式或节流管式，以及节流膨胀阀。
Two common types are the fixed orifice, or the orifice tube, and the thermostatic expansion valve.
节流阀的用途是对冷凝器输出的高压液态制冷剂进行节流降压和调节流量。
Throttle valve role is the export of high-pressure liquid coolant condensers to reduce and regulate the flow of relief.
节流阀，减压阀：管道内沿直径中心轴线上的圆片状旋钮，用作节流阀门或阀门。
A disk turning on a diametrical axis inside a pipe, used as a throttle valve or damper.
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