Vent the air gap and drain line from the relief valve in accordance with code requirements.
按照规程的要求，排出安全阀气隙和排放管道的空气。
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。
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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