When boiler need big volume draining or level regulationvalve failed to work, there should open bypass valve to draining.
当锅炉需要大量排污时，或液位调节阀故障时，应开通旁路阀加大排污。
2
This paper introduces the structure and principle of the pressure regulating overflow valve and rotation speed regulationvalve used in a new type of cleaner.
介绍了新研制的一种新型清洗机所采用的调压溢流阀和转速调节阀结构及其原理。
3
Experimental results have shown that the system features precise speed control and simple design as compared to the sensing circuit controlled by T-type proportional speed regulationvalve.