四通冲洗阀特点：延时自闭、水流路径成“一”字型， 适应的水压比较多， 有手柄式、按钮式、脚踏式。
Characteristics of cross-joint flush valve: they are time-lapse, self-closing, beeline of water route.
在停止放水后，延时关闭进水电磁阀。
After stopping dewatering, the intake electromagnetic valve is closed in delayed time.
比较了几种电磁阀消除水击的效果，认为延时电磁阀最优。
Compared with several other electromagnetic valves in effect of removing water ham mer, timing magnetic valve is considered the best of all.
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