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1·Regulating valves are essential components in the centrifugal pump drainage system.

在离心式水泵排水系统中，调节阀门是必不可少的元件之一。

2·Freezing Weather Precaution - Subsequent to testing a piping system, valves should be in an open position to allow complete drainage.

结冰气候预防-检测管线系统后，阀门应该处于开启状态，做到排泄完全充分。

3·The paper studies the causes for fault occurrence of drainage system and introduces the improvement scheme of drainage system and retrofitting method of drain regulating valves.

本文研究了疏水系统故障产生的原因，并介绍了疏水系统的改进方案和疏水调节阀的改造方法。

4·FREEZING WEATHER PRECAUTION: Subsequent to testing a piping system, valves should be left in an open position to allow complete drainage.

冰冻气候预防措施：测试管道系统后，法门应该处于开启位置，使得能够实现完全排泄。