A type of quick-opening valve whose orifice is opened and closed by a disk that pivots on a shaft in the throat of the valve.

一种快开式阀门，其孔口的开启和关闭靠装在阀门颈部枢轴上的圆盘。

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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。

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For the arch dam which reservoir has no suitable breach to build lasher and has mass flood discharge, opening large orifice for flood discharge has great advantage.

对于库区无适宜垭口可兴建泄洪道，而泄洪量又较大的拱坝工程，在坝身中开设大孔口泄洪具有显著的优越性。

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