This problem becomes more critical if the valve is equipped with a restrictive flow orifice.
如果阀门配备有限制流速孔，这个问题就变得更加关键。
A new diffuser which is impingement inlet plus uniform flow orifice was proposed in this paper.
本文提出了一种新型布水器——冲击入口加均流孔板型布水器，设计简单，易于推广。
The material selection and airflow measurement of the standard constant flow orifice were described.
同时还对标准恒流孔的材料选择及流量测量进行了论述。
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