The calculation formulas for drain valve and vent valve in long drainpipe are approached, and the valve diameters are calculated being compared with the result in some literature.

探讨了热水管网放水阀、放气阀直径的计算公式，计算了长放水管放水阀直径，并与文献中短放水管放水阀直径进行了比较。

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The 23-year-old South Londoner has long enjoyed next-big-thing status, all the while cutting a natty profile in drainpipe jeans, checkered shirts, and baseball caps.

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