Two common types are the fixed orifice, or the orificetube, 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。
2
Finally, the calculated velocity distribution at the orifice of the orifice pulse tube refrigerator was presented at the condition of the optimum opening of the orifice.
最后利用可压缩程序计算了小孔型脉管制冷机当小孔处于最佳开度时小孔处的气流分布。
3
Methods to check Eustachian orifice, give Eustachian tube insufflation and medical therapy simultaneously to 64 patients suffering from OMSC (84 ears), and evaluate therapeutic effect.