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。