以下为句子列表：
英文: Municipal drinking water enters from the first level check valve, passes through drainage device, second level check valve, to supply water to the water downstream, part of medium enter the lower cavity of diaphragm of drainage device, to close the valve
中文: 市政饮用水从第一级止回阀进入，经过排污器、二级止回阀，向下游供水，一部分介质由导管进入排污器膜片下腔，使排污器阀瓣关闭。
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