detector check valve meaning in English

探测器止回阀

This type of strainer is usually installed upstream of most of the devices in the system including the meters , backflow preventers ( or detector check valves ) and flow alarms , in order to protect these devices from damage caused by large particles
这种类型的过滤器通常安装在系统内大多数设施的上游，包括仪表，防回流阀（或检测止回阀）和水流警报装置等，从而保护这些设施不会被大颗粒损坏。