backflow valve meaning in English

回流阀

The system should be flushed before the backflow valve is installed
在安装回流阀之前系统应该进行冲刷。
If the system is not flushed until after the backflow valve is installed , remove both check modules from the valve and open the inlet shutoff to allow water to flow for a sufficient time to flush debris from the water line
如果在安装回流阀之前系统还为冲洗，则从阀门上拆卸两个止回阀模块，开启进口关闭阀，让水流过足够长的时间来冲洗水管内的堆积物。
If the system is not flushed until after the backflow valve is installed , remove both check modules from the valve and open the inlet shutoff to allow water to flow for a sufficient time to flush debris from the water line
如果系统在防回流阀安装后仍然没有冲洗，则要从阀门上拆卸两个止回阀模块，开启进口关闭阀，让水流过足够长的时间，已从水管线内冲洗碎片。