Two common types are the fixed orifice, or the orifice tube, and the thermostatic expansion valve.

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。

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Two common types are the fixed orifice, or the orifice tube, and the thermostatic expansion valve.

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。

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