在维修任何美国瓦茨阀门之前，必须先通过关闭进口和出口关闭阀来实现水系统的关闭。
Prior to servicing any Watts valve, it is mandatory to shut down the water system by closing both the inlet and outlet shutoff valves.
直流式太阳能热水系统的出口流量控制是保证系统正常运行的关键之一。
One of the key points to ensure the normal operation of "once-through solar water heating system" is the outlet flow quantity control.
通过对合成氨变换工段循环热水系统以饱和塔出口半水煤气温度最大为目标函数进行优化计算，证明本文方法是成功的。
The new method has been successfully applied to the optimization of the flowrate of circulating water for the CO shift section in ammonia synthesis.
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