The drain pipe must be the same size as the valve outlet, and must pitch downward from the valve.
排泄管与安全阀出口必须有相同的通径，必须从安全阀开始垂直向下。
A terminal shall be so designed that it cannot be inadvertently pushed onto a pipe or fitting of the same nominal size in such a manner that the terminal outlet free area is restricted.
接线端应该设计到位才能保证不会无缘无故的被塞进管子内，或者，采用相同的公称尺寸，这样一种方式才能确保接线端自由出口处不会受到限制。
Multiple-outlet pipe of varying orifice size has been used to pipe in micro-irrigation system very often.
变孔径多孔管道是微灌系统中常用的一种灌水管道。
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